fix(backend/copilot): prevent double upload in timeout handling

Previous fix created NEW task after timeout, causing double upload:
- Original shielded task still running
- New task also uploading same transcript

Correct fix: Create task FIRST, then shield it. If timeout occurs,
track the SAME task (no double upload).

Fixes double-upload bug in b8c65e3d2

autogpt_platform/backend/backend/copilot/sdk/security_hooks.py

@@ -127,7 +127,6 @@ def create_security_hooks(
     sdk_cwd: str | None = None,
     max_subtasks: int = 3,
     on_compact: Callable[[], None] | None = None,
-    on_stop: Callable[[str, str], None] | None = None,
 ) -> dict[str, Any]:
     """Create the security hooks configuration for Claude Agent SDK.
 
@@ -136,15 +135,12 @@ def create_security_hooks(
     - PostToolUse: Log successful tool executions
     - PostToolUseFailure: Log and handle failed tool executions
     - PreCompact: Log context compaction events (SDK handles compaction automatically)
-    - Stop: Capture transcript path for stateless resume (when *on_stop* is provided)
 
     Args:
         user_id: Current user ID for isolation validation
         sdk_cwd: SDK working directory for workspace-scoped tool validation
         max_subtasks: Maximum concurrent Task (sub-agent) spawns allowed per session
-        on_stop: Callback ``(transcript_path, sdk_session_id)`` invoked when
+        on_compact: Callback invoked when SDK starts compacting context.
-            the SDK finishes processing — used to read the JSONL transcript
-            before the CLI process exits.
 
     Returns:
         Hooks configuration dict for ClaudeAgentOptions
@@ -311,30 +307,6 @@ def create_security_hooks(
                 on_compact()
             return cast(SyncHookJSONOutput, {})
 
-        # --- Stop hook: capture transcript path for stateless resume ---
-        async def stop_hook(
-            input_data: HookInput,
-            tool_use_id: str | None,
-            context: HookContext,
-        ) -> SyncHookJSONOutput:
-            """Capture transcript path when SDK finishes processing.
-
-            The Stop hook fires while the CLI process is still alive, giving us
-            a reliable window to read the JSONL transcript before SIGTERM.
-            """
-            _ = context, tool_use_id
-            transcript_path = cast(str, input_data.get("transcript_path", ""))
-            sdk_session_id = cast(str, input_data.get("session_id", ""))
-
-            if transcript_path and on_stop:
-                logger.info(
-                    f"[SDK] Stop hook: transcript_path={transcript_path}, "
-                    f"sdk_session_id={sdk_session_id[:12]}..."
-                )
-                on_stop(transcript_path, sdk_session_id)
-
-            return cast(SyncHookJSONOutput, {})
-
         hooks: dict[str, Any] = {
             "PreToolUse": [HookMatcher(matcher="*", hooks=[pre_tool_use_hook])],
             "PostToolUse": [HookMatcher(matcher="*", hooks=[post_tool_use_hook])],
@@ -344,9 +316,6 @@ def create_security_hooks(
             "PreCompact": [HookMatcher(matcher="*", hooks=[pre_compact_hook])],
         }
 
-        if on_stop is not None:
-            hooks["Stop"] = [HookMatcher(matcher=None, hooks=[stop_hook])]
-
         return hooks
     except ImportError:
         # Fallback for when SDK isn't available - return empty hooks

autogpt_platform/backend/backend/copilot/sdk/service.py

@@ -12,7 +12,6 @@ import subprocess
 import sys
 import uuid
 from collections.abc import AsyncGenerator
-from dataclasses import dataclass
 from typing import Any, cast
 
 import openai
@@ -21,6 +20,9 @@ from claude_agent_sdk import (
     ClaudeAgentOptions,
     ClaudeSDKClient,
     ResultMessage,
+    TextBlock,
+    ThinkingBlock,
+    ToolResultBlock,
     ToolUseBlock,
 )
 from langfuse import propagate_attributes
@@ -74,11 +76,11 @@ from .tool_adapter import (
 from .transcript import (
     cleanup_cli_project_dir,
     download_transcript,
-    read_transcript_file,
     upload_transcript,
     validate_transcript,
     write_transcript_to_tempfile,
 )
+from .transcript_builder import TranscriptBuilder
 
 logger = logging.getLogger(__name__)
 config = ChatConfig()
@@ -137,19 +139,6 @@ _setup_langfuse_otel()
 _background_tasks: set[asyncio.Task[Any]] = set()
 
 
-@dataclass
-class CapturedTranscript:
-    """Info captured by the SDK Stop hook for stateless --resume."""
-
-    path: str = ""
-    sdk_session_id: str = ""
-    raw_content: str = ""
-
-    @property
-    def available(self) -> bool:
-        return bool(self.path)
-
-
 _SDK_CWD_PREFIX = WORKSPACE_PREFIX
 
 # Heartbeat interval — keep SSE alive through proxies/LBs during tool execution.
@@ -451,6 +440,43 @@ def _cleanup_sdk_tool_results(cwd: str) -> None:
         pass
 
 
+def _format_sdk_content_blocks(blocks: list) -> list[dict[str, Any]]:
+    """Convert SDK content blocks to transcript format.
+
+    Handles TextBlock, ToolUseBlock, ToolResultBlock, and ThinkingBlock.
+    """
+    result: list[dict[str, Any]] = []
+    for block in blocks or []:
+        if isinstance(block, TextBlock):
+            result.append({"type": "text", "text": block.text})
+        elif isinstance(block, ToolUseBlock):
+            result.append(
+                {
+                    "type": "tool_use",
+                    "id": block.id,
+                    "name": block.name,
+                    "input": block.input,
+                }
+            )
+        elif isinstance(block, ToolResultBlock):
+            result.append(
+                {
+                    "type": "tool_result",
+                    "tool_use_id": block.tool_use_id,
+                    "content": block.content,
+                }
+            )
+        elif isinstance(block, ThinkingBlock):
+            result.append(
+                {
+                    "type": "thinking",
+                    "thinking": block.thinking,
+                    "signature": block.signature,
+                }
+            )
+    return result
+
+
 async def _compress_messages(
     messages: list[ChatMessage],
 ) -> tuple[list[ChatMessage], bool]:
@@ -806,6 +832,11 @@ async def stream_chat_completion_sdk(
                 user_id=user_id, session_id=session_id, message_length=len(message)
             )
 
+    # Structured log prefix: [SDK][<session>][T<turn>]
+    # Turn = number of user messages (1-based), computed AFTER appending the new message.
+    turn = sum(1 for m in session.messages if m.role == "user")
+    log_prefix = f"[SDK][{session_id[:12]}][T{turn}]"
+
     session = await upsert_chat_session(session)
 
     # Generate title for new sessions (first user message)
@@ -823,10 +854,11 @@ async def stream_chat_completion_sdk(
     message_id = str(uuid.uuid4())
     stream_id = str(uuid.uuid4())
     stream_completed = False
+    ended_with_stream_error = False
     e2b_sandbox = None
     use_resume = False
     resume_file: str | None = None
-    captured_transcript = CapturedTranscript()
+    transcript_builder = TranscriptBuilder()
     sdk_cwd = ""
 
     # Acquire stream lock to prevent concurrent streams to the same session
@@ -841,7 +873,7 @@ async def stream_chat_completion_sdk(
     if lock_owner != stream_id:
         # Another stream is active
         logger.warning(
-            f"[SDK] Session {session_id} already has an active stream: {lock_owner}"
+            f"{log_prefix} Session already has an active stream: {lock_owner}"
         )
         yield StreamError(
             errorText="Another stream is already active for this session. "
@@ -865,7 +897,7 @@ async def stream_chat_completion_sdk(
             sdk_cwd = _make_sdk_cwd(session_id)
             os.makedirs(sdk_cwd, exist_ok=True)
         except (ValueError, OSError) as e:
-            logger.error("[SDK] [%s] Invalid SDK cwd: %s", session_id[:12], e)
+            logger.error("%s Invalid SDK cwd: %s", log_prefix, e)
             yield StreamError(
                 errorText="Unable to initialize working directory.",
                 code="sdk_cwd_error",
@@ -909,12 +941,13 @@ async def stream_chat_completion_sdk(
             ):
                 return None
             try:
-                return await download_transcript(user_id, session_id)
+                return await download_transcript(
+                    user_id, session_id, log_prefix=log_prefix
+                )
             except Exception as transcript_err:
                 logger.warning(
-                    "[SDK] [%s] Transcript download failed, continuing without "
+                    "%s Transcript download failed, continuing without " "--resume: %s",
-                    "--resume: %s",
+                    log_prefix,
-                    session_id[:12],
                     transcript_err,
                 )
                 return None
@@ -936,11 +969,18 @@ async def stream_chat_completion_sdk(
         transcript_msg_count = 0
         if dl:
             is_valid = validate_transcript(dl.content)
-            if is_valid:
+            dl_lines = dl.content.strip().split("\n") if dl.content else []
             logger.info(
-                    f"[SDK] Transcript available for session {session_id}: "
+                "%s Downloaded transcript: %dB, %d lines, " "msg_count=%d, valid=%s",
-                    f"{len(dl.content)}B, msg_count={dl.message_count}"
+                log_prefix,
+                len(dl.content),
+                len(dl_lines),
+                dl.message_count,
+                is_valid,
             )
+            if is_valid:
+                # Load previous FULL context into builder
+                transcript_builder.load_previous(dl.content)
                 resume_file = write_transcript_to_tempfile(
                     dl.content, session_id, sdk_cwd
                 )
@@ -948,16 +988,14 @@ async def stream_chat_completion_sdk(
                     use_resume = True
                     transcript_msg_count = dl.message_count
                     logger.debug(
-                        f"[SDK] Using --resume ({len(dl.content)}B, "
+                        f"{log_prefix} Using --resume ({len(dl.content)}B, "
                         f"msg_count={transcript_msg_count})"
                     )
             else:
-                logger.warning(
+                logger.warning(f"{log_prefix} Transcript downloaded but invalid")
-                    f"[SDK] Transcript downloaded but invalid for {session_id}"
-                )
         elif config.claude_agent_use_resume and user_id and len(session.messages) > 1:
             logger.warning(
-                f"[SDK] No transcript available for {session_id} "
+                f"{log_prefix} No transcript available "
                 f"({len(session.messages)} messages in session)"
             )
 
@@ -979,25 +1017,6 @@ async def stream_chat_completion_sdk(
 
         sdk_model = _resolve_sdk_model()
 
-        # --- Transcript capture via Stop hook ---
-        # Read the file content immediately — the SDK may clean up
-        # the file before our finally block runs.
-        def _on_stop(transcript_path: str, sdk_session_id: str) -> None:
-            captured_transcript.path = transcript_path
-            captured_transcript.sdk_session_id = sdk_session_id
-            content = read_transcript_file(transcript_path)
-            if content:
-                captured_transcript.raw_content = content
-                logger.info(
-                    f"[SDK] Stop hook: captured {len(content)}B from "
-                    f"{transcript_path}"
-                )
-            else:
-                logger.warning(
-                    f"[SDK] Stop hook: transcript file empty/missing at "
-                    f"{transcript_path}"
-                )
-
         # Track SDK-internal compaction (PreCompact hook → start, next msg → end)
         compaction = CompactionTracker()
 
@@ -1005,7 +1024,6 @@ async def stream_chat_completion_sdk(
             user_id,
             sdk_cwd=sdk_cwd,
             max_subtasks=config.claude_agent_max_subtasks,
-            on_stop=_on_stop if config.claude_agent_use_resume else None,
             on_compact=compaction.on_compact,
         )
 
@@ -1040,7 +1058,10 @@ async def stream_chat_completion_sdk(
             session_id=session_id,
             trace_name="copilot-sdk",
             tags=["sdk"],
-            metadata={"resume": str(use_resume)},
+            metadata={
+                "resume": str(use_resume),
+                "conversation_turn": str(turn),
+            },
         )
         _otel_ctx.__enter__()
 
@@ -1074,9 +1095,9 @@ async def stream_chat_completion_sdk(
                 query_message = f"{query_message}\n\n{attachments.hint}"
 
             logger.info(
-                "[SDK] [%s] Sending query — resume=%s, total_msgs=%d, "
+                "%s Sending query — resume=%s, total_msgs=%d, "
                 "query_len=%d, attached_files=%d, image_blocks=%d",
-                session_id[:12],
+                log_prefix,
                 use_resume,
                 len(session.messages),
                 len(query_message),
@@ -1105,8 +1126,12 @@ async def stream_chat_completion_sdk(
                 await client._transport.write(  # noqa: SLF001
                     json.dumps(user_msg) + "\n"
                 )
+                # Capture user message in transcript (multimodal)
+                transcript_builder.add_user_message(content=content_blocks)
             else:
                 await client.query(query_message, session_id=session_id)
+                # Capture user message in transcript (text only)
+                transcript_builder.add_user_message(content=query_message)
 
             assistant_response = ChatMessage(role="assistant", content="")
             accumulated_tool_calls: list[dict[str, Any]] = []
@@ -1150,8 +1175,8 @@ async def stream_chat_completion_sdk(
                         sdk_msg = done.pop().result()
                     except StopAsyncIteration:
                         logger.info(
-                            "[SDK] [%s] Stream ended normally (StopAsyncIteration)",
+                            "%s Stream ended normally (StopAsyncIteration)",
-                            session_id[:12],
+                            log_prefix,
                         )
                         break
                     except Exception as stream_err:
@@ -1160,8 +1185,8 @@ async def stream_chat_completion_sdk(
                         # so the session can still be saved and the
                         # frontend gets a clean finish.
                         logger.error(
-                            "[SDK] [%s] Stream error from SDK: %s",
+                            "%s Stream error from SDK: %s",
-                            session_id[:12],
+                            log_prefix,
                             stream_err,
                             exc_info=True,
                         )
@@ -1173,9 +1198,9 @@ async def stream_chat_completion_sdk(
                         break
 
                     logger.info(
-                        "[SDK] [%s] Received: %s %s "
+                        "%s Received: %s %s "
                         "(unresolved=%d, current=%d, resolved=%d)",
-                        session_id[:12],
+                        log_prefix,
                         type(sdk_msg).__name__,
                         getattr(sdk_msg, "subtype", ""),
                         len(adapter.current_tool_calls)
@@ -1184,6 +1209,15 @@ async def stream_chat_completion_sdk(
                         len(adapter.resolved_tool_calls),
                     )
 
+                    # Capture AssistantMessage in transcript
+                    if isinstance(sdk_msg, AssistantMessage):
+                        content_blocks = _format_sdk_content_blocks(sdk_msg.content)
+                        model_name = getattr(sdk_msg, "model", "")
+                        transcript_builder.add_assistant_message(
+                            content_blocks=content_blocks,
+                            model=model_name,
+                        )
+
                     # Race-condition fix: SDK hooks (PostToolUse) are
                     # executed asynchronously via start_soon() — the next
                     # message can arrive before the hook stashes output.
@@ -1210,10 +1244,10 @@ async def stream_chat_completion_sdk(
                             await asyncio.sleep(0)
                         else:
                             logger.warning(
-                                "[SDK] [%s] Timed out waiting for "
+                                "%s Timed out waiting for "
                                 "PostToolUse hook stash "
                                 "(%d unresolved tool calls)",
-                                session_id[:12],
+                                log_prefix,
                                 len(adapter.current_tool_calls)
                                 - len(adapter.resolved_tool_calls),
                             )
@@ -1221,9 +1255,9 @@ async def stream_chat_completion_sdk(
                     # Log ResultMessage details for debugging
                     if isinstance(sdk_msg, ResultMessage):
                         logger.info(
-                            "[SDK] [%s] Received: ResultMessage %s "
+                            "%s Received: ResultMessage %s "
                             "(unresolved=%d, current=%d, resolved=%d)",
-                            session_id[:12],
+                            log_prefix,
                             sdk_msg.subtype,
                             len(adapter.current_tool_calls)
                             - len(adapter.resolved_tool_calls),
@@ -1232,8 +1266,8 @@ async def stream_chat_completion_sdk(
                         )
                         if sdk_msg.subtype in ("error", "error_during_execution"):
                             logger.error(
-                                "[SDK] [%s] SDK execution failed with error: %s",
+                                "%s SDK execution failed with error: %s",
-                                session_id[:12],
+                                log_prefix,
                                 sdk_msg.result or "(no error message provided)",
                             )
 
@@ -1258,8 +1292,8 @@ async def stream_chat_completion_sdk(
                                 out_len = len(str(response.output))
                                 extra = f", output_len={out_len}"
                             logger.info(
-                                "[SDK] [%s] Tool event: %s, tool=%s%s",
+                                "%s Tool event: %s, tool=%s%s",
-                                session_id[:12],
+                                log_prefix,
                                 type(response).__name__,
                                 getattr(response, "toolName", "N/A"),
                                 extra,
@@ -1268,8 +1302,8 @@ async def stream_chat_completion_sdk(
                         # Log errors being sent to frontend
                         if isinstance(response, StreamError):
                             logger.error(
-                                "[SDK] [%s] Sending error to frontend: %s (code=%s)",
+                                "%s Sending error to frontend: %s (code=%s)",
-                                session_id[:12],
+                                log_prefix,
                                 response.errorText,
                                 response.code,
                             )
@@ -1335,8 +1369,8 @@ async def stream_chat_completion_sdk(
                 # server shutdown).  Log and let the safety-net / finally
                 # blocks handle cleanup.
                 logger.warning(
-                    "[SDK] [%s] Streaming loop cancelled (asyncio.CancelledError)",
+                    "%s Streaming loop cancelled (asyncio.CancelledError)",
-                    session_id[:12],
+                    log_prefix,
                 )
                 raise
             finally:
@@ -1350,7 +1384,8 @@ async def stream_chat_completion_sdk(
                     except (asyncio.CancelledError, StopAsyncIteration):
                         # Expected: task was cancelled or exhausted during cleanup
                         logger.info(
-                            "[SDK] Pending __anext__ task completed during cleanup"
+                            "%s Pending __anext__ task completed during cleanup",
+                            log_prefix,
                         )
 
             # Safety net: if tools are still unresolved after the
@@ -1359,9 +1394,9 @@ async def stream_chat_completion_sdk(
             # them now so the frontend stops showing spinners.
             if adapter.has_unresolved_tool_calls:
                 logger.warning(
-                    "[SDK] [%s] %d unresolved tool(s) after stream loop — "
+                    "%s %d unresolved tool(s) after stream loop — "
                     "flushing as safety net",
-                    session_id[:12],
+                    log_prefix,
                     len(adapter.current_tool_calls) - len(adapter.resolved_tool_calls),
                 )
                 safety_responses: list[StreamBaseResponse] = []
@@ -1372,8 +1407,8 @@ async def stream_chat_completion_sdk(
                         (StreamToolInputAvailable, StreamToolOutputAvailable),
                     ):
                         logger.info(
-                            "[SDK] [%s] Safety flush: %s, tool=%s",
+                            "%s Safety flush: %s, tool=%s",
-                            session_id[:12],
+                            log_prefix,
                             type(response).__name__,
                             getattr(response, "toolName", "N/A"),
                         )
@@ -1386,8 +1421,8 @@ async def stream_chat_completion_sdk(
             # StreamFinish is published by mark_session_completed in the processor.
             if not stream_completed and not ended_with_stream_error:
                 logger.info(
-                    "[SDK] [%s] Stream ended without ResultMessage (stopped by user)",
+                    "%s Stream ended without ResultMessage (stopped by user)",
-                    session_id[:12],
+                    log_prefix,
                 )
                 closing_responses: list[StreamBaseResponse] = []
                 adapter._end_text_if_open(closing_responses)
@@ -1408,69 +1443,36 @@ async def stream_chat_completion_sdk(
             ) and not has_appended_assistant:
                 session.messages.append(assistant_response)
 
-        # --- Upload transcript for next-turn --resume ---
+        # Transcript upload is handled exclusively in the finally block
-        # After async with the SDK task group has exited, so the Stop
+        # to avoid double-uploads (the success path used to upload the
-        # hook has already fired and the CLI has been SIGTERMed.  The
+        # old resume file, then the finally block overwrote it with the
-        # CLI uses appendFileSync, so all writes are safely on disk.
+        # stop hook content — which could be smaller after compaction).
-        if config.claude_agent_use_resume and user_id:
+
-            # With --resume the CLI appends to the resume file (most
+        if ended_with_stream_error:
-            # complete).  Otherwise use the Stop hook path.
+            logger.warning(
-            if use_resume and resume_file:
+                "%s Stream ended with SDK error after %d messages",
-                raw_transcript = read_transcript_file(resume_file)
+                log_prefix,
-                logger.debug("[SDK] Transcript source: resume file")
+                len(session.messages),
-            elif captured_transcript.path:
-                raw_transcript = read_transcript_file(captured_transcript.path)
-                logger.debug(
-                    "[SDK] Transcript source: stop hook (%s), read result: %s",
-                    captured_transcript.path,
-                    f"{len(raw_transcript)}B" if raw_transcript else "None",
             )
         else:
-                raw_transcript = None
-
-            if not raw_transcript:
-                logger.debug(
-                    "[SDK] No usable transcript — CLI file had no "
-                    "conversation entries (expected for first turn "
-                    "without --resume)"
-                )
-
-            if raw_transcript:
-                # Shield the upload from generator cancellation so a
-                # client disconnect / page refresh doesn't lose the
-                # transcript.  The upload must finish even if the SSE
-                # connection is torn down.
-                await asyncio.shield(
-                    _try_upload_transcript(
-                        user_id,
-                        session_id,
-                        raw_transcript,
-                        message_count=len(session.messages),
-                    )
-                )
-
             logger.info(
-            "[SDK] [%s] Stream completed successfully with %d messages",
+                "%s Stream completed successfully with %d messages",
-            session_id[:12],
+                log_prefix,
                 len(session.messages),
             )
     except BaseException as e:
         # Catch BaseException to handle both Exception and CancelledError
         # (CancelledError inherits from BaseException in Python 3.8+)
         if isinstance(e, asyncio.CancelledError):
-            logger.warning("[SDK] [%s] Session cancelled", session_id[:12])
+            logger.warning("%s Session cancelled", log_prefix)
             error_msg = "Operation cancelled"
         else:
             error_msg = str(e) or type(e).__name__
             # SDK cleanup RuntimeError is expected during cancellation, log as warning
             if isinstance(e, RuntimeError) and "cancel scope" in str(e):
-                logger.warning(
+                logger.warning("%s SDK cleanup error: %s", log_prefix, error_msg)
-                    "[SDK] [%s] SDK cleanup error: %s", session_id[:12], error_msg
-                )
             else:
-                logger.error(
+                logger.error("%s Error: %s", log_prefix, error_msg, exc_info=True)
-                    f"[SDK] [%s] Error: {error_msg}", session_id[:12], exc_info=True
-                )
 
         # Append error marker to session (non-invasive text parsing approach)
         # The finally block will persist the session with this error marker
@@ -1481,8 +1483,8 @@ async def stream_chat_completion_sdk(
                 )
             )
             logger.debug(
-                "[SDK] [%s] Appended error marker, will be persisted in finally",
+                "%s Appended error marker, will be persisted in finally",
-                session_id[:12],
+                log_prefix,
             )
 
         # Yield StreamError for immediate feedback (only for non-cancellation errors)
@@ -1514,47 +1516,72 @@ async def stream_chat_completion_sdk(
             try:
                 await asyncio.shield(upsert_chat_session(session))
                 logger.info(
-                    "[SDK] [%s] Session persisted in finally with %d messages",
+                    "%s Session persisted in finally with %d messages",
-                    session_id[:12],
+                    log_prefix,
                     len(session.messages),
                 )
             except Exception as persist_err:
                 logger.error(
-                    "[SDK] [%s] Failed to persist session in finally: %s",
+                    "%s Failed to persist session in finally: %s",
-                    session_id[:12],
+                    log_prefix,
                     persist_err,
                     exc_info=True,
                 )
 
         # --- Upload transcript for next-turn --resume ---
         # This MUST run in finally so the transcript is uploaded even when
-        # the streaming loop raises an exception.  The CLI uses
+        # the streaming loop raises an exception.
-        # appendFileSync, so whatever was written before the error/SIGTERM
+        # The transcript represents the COMPLETE active context (atomic).
-        # is safely on disk and still useful for the next turn.
+        if config.claude_agent_use_resume and user_id and session is not None:
-        if config.claude_agent_use_resume and user_id:
             try:
-                # Prefer content captured in the Stop hook (read before
+                # Build complete transcript from captured SDK messages
-                # cleanup removes the file).  Fall back to the resume
+                transcript_content = transcript_builder.to_jsonl()
-                # file when the stop hook didn't fire (e.g. error before
-                # completion) so we don't lose the prior transcript.
-                raw_transcript = captured_transcript.raw_content or None
-                if not raw_transcript and use_resume and resume_file:
-                    raw_transcript = read_transcript_file(resume_file)
 
-                if raw_transcript and session is not None:
+                if not transcript_content:
-                    await asyncio.shield(
+                    logger.warning(
-                        _try_upload_transcript(
+                        "%s No transcript to upload (builder empty)", log_prefix
-                            user_id,
-                            session_id,
-                            raw_transcript,
-                            message_count=len(session.messages),
                     )
+                elif not validate_transcript(transcript_content):
+                    logger.warning(
+                        "%s Transcript invalid, skipping upload (entries=%d)",
+                        log_prefix,
+                        transcript_builder.entry_count,
                     )
                 else:
-                    logger.warning(f"[SDK] No transcript to upload for {session_id}")
+                    logger.info(
+                        "%s Uploading complete transcript (entries=%d, bytes=%d)",
+                        log_prefix,
+                        transcript_builder.entry_count,
+                        len(transcript_content),
+                    )
+                    # Create task first so we have a reference if timeout occurs
+                    upload_task = asyncio.create_task(
+                        upload_transcript(
+                            user_id=user_id,
+                            session_id=session_id,
+                            content=transcript_content,
+                            message_count=len(session.messages),
+                            log_prefix=log_prefix,
+                        )
+                    )
+                    try:
+                        async with asyncio.timeout(30):
+                            await asyncio.shield(upload_task)
+                    except TimeoutError:
+                        # Timeout fired but shield keeps upload running - track the
+                        # SAME task to prevent garbage collection (no double upload)
+                        logger.warning(
+                            "%s Transcript upload exceeded 30s timeout, "
+                            "continuing in background",
+                            log_prefix,
+                        )
+                        _background_tasks.add(upload_task)
+                        upload_task.add_done_callback(_background_tasks.discard)
             except Exception as upload_err:
                 logger.error(
-                    f"[SDK] Transcript upload failed in finally: {upload_err}",
+                    "%s Transcript upload failed in finally: %s",
+                    log_prefix,
+                    upload_err,
                     exc_info=True,
                 )
 
@@ -1565,33 +1592,6 @@ async def stream_chat_completion_sdk(
         await lock.release()
 
 
-async def _try_upload_transcript(
-    user_id: str,
-    session_id: str,
-    raw_content: str,
-    message_count: int = 0,
-) -> bool:
-    """Strip progress entries and upload transcript (with timeout).
-
-    Returns True if the upload completed without error.
-    """
-    try:
-        async with asyncio.timeout(30):
-            await upload_transcript(
-                user_id, session_id, raw_content, message_count=message_count
-            )
-        return True
-    except asyncio.TimeoutError:
-        logger.warning(f"[SDK] Transcript upload timed out for {session_id}")
-        return False
-    except Exception as e:
-        logger.error(
-            f"[SDK] Failed to upload transcript for {session_id}: {e}",
-            exc_info=True,
-        )
-        return False
-
-
 async def _update_title_async(
     session_id: str, message: str, user_id: str | None = None
 ) -> None:

autogpt_platform/backend/backend/copilot/sdk/transcript.py

@@ -58,41 +58,40 @@ def strip_progress_entries(content: str) -> str:
     Removes entries whose ``type`` is in ``STRIPPABLE_TYPES`` and reparents
     any remaining child entries so the ``parentUuid`` chain stays intact.
     Typically reduces transcript size by ~30%.
+
+    Entries that are not stripped or reparented are kept as their original
+    raw JSON line to avoid unnecessary re-serialization that changes
+    whitespace or key ordering.
     """
     lines = content.strip().split("\n")
 
-    entries: list[dict] = []
+    # Parse entries, keeping the original line alongside the parsed dict.
+    parsed: list[tuple[str, dict | None]] = []
     for line in lines:
         try:
-            entries.append(json.loads(line))
+            parsed.append((line, json.loads(line)))
         except json.JSONDecodeError:
-            # Keep unparseable lines as-is (safety)
+            parsed.append((line, None))
-            entries.append({"_raw": line})
 
+    # First pass: identify stripped UUIDs and build parent map.
     stripped_uuids: set[str] = set()
     uuid_to_parent: dict[str, str] = {}
-    kept: list[dict] = []
 
-    for entry in entries:
+    for _line, entry in parsed:
-        if "_raw" in entry:
+        if entry is None:
-            kept.append(entry)
             continue
         uid = entry.get("uuid", "")
         parent = entry.get("parentUuid", "")
-        entry_type = entry.get("type", "")
-
         if uid:
             uuid_to_parent[uid] = parent
-
+        if entry.get("type", "") in STRIPPABLE_TYPES and uid:
-        if entry_type in STRIPPABLE_TYPES:
-            if uid:
             stripped_uuids.add(uid)
-        else:
-            kept.append(entry)
 
-    # Reparent: walk up chain through stripped entries to find surviving ancestor
+    # Second pass: keep non-stripped entries, reparenting where needed.
-    for entry in kept:
+    # Preserve original line when no reparenting is required.
-        if "_raw" in entry:
+    reparented: set[str] = set()
+    for _line, entry in parsed:
+        if entry is None:
             continue
         parent = entry.get("parentUuid", "")
         original_parent = parent
@@ -100,63 +99,32 @@ def strip_progress_entries(content: str) -> str:
             parent = uuid_to_parent.get(parent, "")
         if parent != original_parent:
             entry["parentUuid"] = parent
+            uid = entry.get("uuid", "")
+            if uid:
+                reparented.add(uid)
 
     result_lines: list[str] = []
-    for entry in kept:
+    for line, entry in parsed:
-        if "_raw" in entry:
+        if entry is None:
-            result_lines.append(entry["_raw"])
+            result_lines.append(line)
-        else:
+            continue
+        if entry.get("type", "") in STRIPPABLE_TYPES:
+            continue
+        uid = entry.get("uuid", "")
+        if uid in reparented:
+            # Re-serialize only entries whose parentUuid was changed.
             result_lines.append(json.dumps(entry, separators=(",", ":")))
+        else:
+            result_lines.append(line)
 
     return "\n".join(result_lines) + "\n"
 
 
 # ---------------------------------------------------------------------------
-# Local file I/O (read from CLI's JSONL, write temp file for --resume)
+# Local file I/O (write temp file for --resume)
 # ---------------------------------------------------------------------------
 
 
-def read_transcript_file(transcript_path: str) -> str | None:
-    """Read a JSONL transcript file from disk.
-
-    Returns the raw JSONL content, or ``None`` if the file is missing, empty,
-    or only contains metadata (≤2 lines with no conversation messages).
-    """
-    if not transcript_path or not os.path.isfile(transcript_path):
-        logger.debug(f"[Transcript] File not found: {transcript_path}")
-        return None
-
-    try:
-        with open(transcript_path) as f:
-            content = f.read()
-
-        if not content.strip():
-            logger.debug("[Transcript] File is empty: %s", transcript_path)
-            return None
-
-        lines = content.strip().split("\n")
-
-        # Validate that the transcript has real conversation content
-        # (not just metadata like queue-operation entries).
-        if not validate_transcript(content):
-            logger.debug(
-                "[Transcript] No conversation content (%d lines) in %s",
-                len(lines),
-                transcript_path,
-            )
-            return None
-
-        logger.info(
-            f"[Transcript] Read {len(lines)} lines, "
-            f"{len(content)} bytes from {transcript_path}"
-        )
-        return content
-
-    except (json.JSONDecodeError, OSError) as e:
-        logger.warning(f"[Transcript] Failed to read {transcript_path}: {e}")
-        return None
-
-
 def _sanitize_id(raw_id: str, max_len: int = 36) -> str:
     """Sanitize an ID for safe use in file paths.
 
@@ -171,14 +139,6 @@ def _sanitize_id(raw_id: str, max_len: int = 36) -> str:
 _SAFE_CWD_PREFIX = os.path.realpath("/tmp/copilot-")
 
 
-def _encode_cwd_for_cli(cwd: str) -> str:
-    """Encode a working directory path the same way the Claude CLI does.
-
-    The CLI replaces all non-alphanumeric characters with ``-``.
-    """
-    return re.sub(r"[^a-zA-Z0-9]", "-", os.path.realpath(cwd))
-
-
 def cleanup_cli_project_dir(sdk_cwd: str) -> None:
     """Remove the CLI's project directory for a specific working directory.
 
@@ -188,7 +148,8 @@ def cleanup_cli_project_dir(sdk_cwd: str) -> None:
     """
     import shutil
 
-    cwd_encoded = _encode_cwd_for_cli(sdk_cwd)
+    # Encode cwd the same way CLI does (replaces non-alphanumeric with -)
+    cwd_encoded = re.sub(r"[^a-zA-Z0-9]", "-", os.path.realpath(sdk_cwd))
     config_dir = os.environ.get("CLAUDE_CONFIG_DIR") or os.path.expanduser("~/.claude")
     projects_base = os.path.realpath(os.path.join(config_dir, "projects"))
     project_dir = os.path.realpath(os.path.join(projects_base, cwd_encoded))
@@ -248,32 +209,30 @@ def write_transcript_to_tempfile(
 def validate_transcript(content: str | None) -> bool:
     """Check that a transcript has actual conversation messages.
 
-    A valid transcript for resume needs at least one user message and one
+    A valid transcript needs at least one assistant message (not just
-    assistant message (not just queue-operation / file-history-snapshot
+    queue-operation / file-history-snapshot metadata).  We do NOT require
-    metadata).
+    a ``type: "user"`` entry because with ``--resume`` the user's message
+    is passed as a CLI query parameter and does not appear in the
+    transcript file.
     """
     if not content or not content.strip():
         return False
 
     lines = content.strip().split("\n")
-    if len(lines) < 2:
-        return False
 
-    has_user = False
     has_assistant = False
 
     for line in lines:
+        if not line.strip():
+            continue
         try:
             entry = json.loads(line)
-            msg_type = entry.get("type")
+            if entry.get("type") == "assistant":
-            if msg_type == "user":
-                has_user = True
-            elif msg_type == "assistant":
                 has_assistant = True
         except json.JSONDecodeError:
             return False
 
-    return has_user and has_assistant
+    return has_assistant
 
 
 # ---------------------------------------------------------------------------
@@ -328,26 +287,43 @@ async def upload_transcript(
     session_id: str,
     content: str,
     message_count: int = 0,
+    log_prefix: str = "[Transcript]",
 ) -> None:
-    """Strip progress entries and upload transcript to bucket storage.
+    """Strip progress entries and upload complete transcript.
+
+    The transcript represents the FULL active context (atomic).
+    Each upload REPLACES the previous transcript entirely.
 
     The executor holds a cluster lock per session, so concurrent uploads for
-    the same session cannot happen.  We always overwrite — with ``--resume``
+    the same session cannot happen.
-    the CLI may compact old tool results, so neither byte size nor line count
-    is a reliable proxy for "newer".
 
     Args:
-        message_count: ``len(session.messages)`` at upload time — used by
+        content: Complete JSONL transcript (from TranscriptBuilder).
-            the next turn to detect staleness and compress only the gap.
+        message_count: ``len(session.messages)`` at upload time.
     """
     from backend.util.workspace_storage import get_workspace_storage
 
+    # Strip metadata entries (progress, file-history-snapshot, etc.)
+    # Note: SDK-built transcripts shouldn't have these, but strip for safety
     stripped = strip_progress_entries(content)
     if not validate_transcript(stripped):
+        # Log entry types for debugging — helps identify why validation failed
+        entry_types: list[str] = []
+        for line in stripped.strip().split("\n"):
+            try:
+                entry_types.append(json.loads(line).get("type", "?"))
+            except json.JSONDecodeError:
+                entry_types.append("INVALID_JSON")
         logger.warning(
-            f"[Transcript] Skipping upload — stripped content not valid "
+            "%s Skipping upload — stripped content not valid "
-            f"for session {session_id}"
+            "(types=%s, stripped_len=%d, raw_len=%d)",
+            log_prefix,
+            entry_types,
+            len(stripped),
+            len(content),
         )
+        logger.debug("%s Raw content preview: %s", log_prefix, content[:500])
+        logger.debug("%s Stripped content: %s", log_prefix, stripped[:500])
         return
 
     storage = await get_workspace_storage()
@@ -373,17 +349,18 @@ async def upload_transcript(
             content=json.dumps(meta).encode("utf-8"),
         )
     except Exception as e:
-        logger.warning(f"[Transcript] Failed to write metadata for {session_id}: {e}")
+        logger.warning(f"{log_prefix} Failed to write metadata: {e}")
 
     logger.info(
-        f"[Transcript] Uploaded {len(encoded)}B "
+        f"{log_prefix} Uploaded {len(encoded)}B "
-        f"(stripped from {len(content)}B, msg_count={message_count}) "
+        f"(stripped from {len(content)}B, msg_count={message_count})"
-        f"for session {session_id}"
     )
 
 
 async def download_transcript(
-    user_id: str, session_id: str
+    user_id: str,
+    session_id: str,
+    log_prefix: str = "[Transcript]",
 ) -> TranscriptDownload | None:
     """Download transcript and metadata from bucket storage.
 
@@ -399,10 +376,10 @@ async def download_transcript(
         data = await storage.retrieve(path)
         content = data.decode("utf-8")
     except FileNotFoundError:
-        logger.debug(f"[Transcript] No transcript in storage for {session_id}")
+        logger.debug(f"{log_prefix} No transcript in storage")
         return None
     except Exception as e:
-        logger.warning(f"[Transcript] Failed to download transcript: {e}")
+        logger.warning(f"{log_prefix} Failed to download transcript: {e}")
         return None
 
     # Try to load metadata (best-effort — old transcripts won't have it)
@@ -425,10 +402,7 @@ async def download_transcript(
     except (FileNotFoundError, json.JSONDecodeError, Exception):
         pass  # No metadata — treat as unknown (msg_count=0 → always fill gap)
 
-    logger.info(
+    logger.info(f"{log_prefix} Downloaded {len(content)}B (msg_count={message_count})")
-        f"[Transcript] Downloaded {len(content)}B "
-        f"(msg_count={message_count}) for session {session_id}"
-    )
     return TranscriptDownload(
         content=content,
         message_count=message_count,

autogpt_platform/backend/backend/copilot/sdk/transcript_builder.py

@@ -0,0 +1,140 @@
+"""Build complete JSONL transcript from SDK messages.
+
+The transcript represents the FULL active context at any point in time.
+Each upload REPLACES the previous transcript atomically.
+
+Flow:
+  Turn 1: Upload [msg1, msg2]
+  Turn 2: Download [msg1, msg2] → Upload [msg1, msg2, msg3, msg4] (REPLACE)
+  Turn 3: Download [msg1, msg2, msg3, msg4] → Upload [all messages] (REPLACE)
+
+The transcript is never incremental - always the complete atomic state.
+"""
+
+import json
+import logging
+from typing import Any
+from uuid import uuid4
+
+from pydantic import BaseModel
+
+logger = logging.getLogger(__name__)
+
+
+class TranscriptEntry(BaseModel):
+    """Single transcript entry (user or assistant turn)."""
+
+    type: str
+    uuid: str
+    parentUuid: str | None
+    message: dict[str, Any]
+
+
+class TranscriptBuilder:
+    """Build complete JSONL transcript from SDK messages.
+
+    This builder maintains the FULL conversation state, not incremental changes.
+    The output is always the complete active context.
+    """
+
+    def __init__(self) -> None:
+        self._entries: list[TranscriptEntry] = []
+        self._last_uuid: str | None = None
+
+    def load_previous(self, content: str) -> None:
+        """Load complete previous transcript.
+
+        This loads the FULL previous context. As new messages come in,
+        we append to this state. The final output is the complete context
+        (previous + new), not just the delta.
+        """
+        if not content or not content.strip():
+            return
+
+        for line in content.strip().split("\n"):
+            if not line.strip():
+                continue
+
+            try:
+                data = json.loads(line)
+            except json.JSONDecodeError:
+                logger.warning("Failed to parse transcript line: %s", line[:100])
+                continue
+
+            # Only load conversation messages (user/assistant)
+            # Skip metadata entries
+            if data.get("type") not in ("user", "assistant"):
+                continue
+
+            entry = TranscriptEntry(
+                type=data["type"],
+                uuid=data.get("uuid") or str(uuid4()),
+                parentUuid=data.get("parentUuid"),
+                message=data.get("message", {}),
+            )
+            self._entries.append(entry)
+            self._last_uuid = entry.uuid
+
+        logger.info(
+            "Loaded %d entries from previous transcript (last_uuid=%s)",
+            len(self._entries),
+            self._last_uuid[:12] if self._last_uuid else None,
+        )
+
+    def add_user_message(
+        self, content: str | list[dict], uuid: str | None = None
+    ) -> None:
+        """Add user message to the complete context."""
+        msg_uuid = uuid or str(uuid4())
+
+        self._entries.append(
+            TranscriptEntry(
+                type="user",
+                uuid=msg_uuid,
+                parentUuid=self._last_uuid,
+                message={"role": "user", "content": content},
+            )
+        )
+        self._last_uuid = msg_uuid
+
+    def add_assistant_message(
+        self, content_blocks: list[dict], model: str = ""
+    ) -> None:
+        """Add assistant message to the complete context."""
+        msg_uuid = str(uuid4())
+
+        self._entries.append(
+            TranscriptEntry(
+                type="assistant",
+                uuid=msg_uuid,
+                parentUuid=self._last_uuid,
+                message={
+                    "role": "assistant",
+                    "model": model,
+                    "content": content_blocks,
+                },
+            )
+        )
+        self._last_uuid = msg_uuid
+
+    def to_jsonl(self) -> str:
+        """Export complete context as JSONL.
+
+        Returns the FULL conversation state (all entries), not incremental.
+        This output REPLACES any previous transcript.
+        """
+        if not self._entries:
+            return ""
+
+        lines = [entry.model_dump_json(exclude_none=True) for entry in self._entries]
+        return "\n".join(lines) + "\n"
+
+    @property
+    def entry_count(self) -> int:
+        """Total number of entries in the complete context."""
+        return len(self._entries)
+
+    @property
+    def is_empty(self) -> bool:
+        """Whether this builder has any entries."""
+        return len(self._entries) == 0

autogpt_platform/backend/backend/copilot/sdk/transcript_test.py

@@ -5,7 +5,6 @@ import os
 
 from .transcript import (
     STRIPPABLE_TYPES,
-    read_transcript_file,
     strip_progress_entries,
     validate_transcript,
     write_transcript_to_tempfile,
@@ -38,49 +37,6 @@ PROGRESS_ENTRY = {
 VALID_TRANSCRIPT = _make_jsonl(METADATA_LINE, FILE_HISTORY, USER_MSG, ASST_MSG)
 
 
-# --- read_transcript_file ---
-
-
-class TestReadTranscriptFile:
-    def test_returns_content_for_valid_file(self, tmp_path):
-        path = tmp_path / "session.jsonl"
-        path.write_text(VALID_TRANSCRIPT)
-        result = read_transcript_file(str(path))
-        assert result is not None
-        assert "user" in result
-
-    def test_returns_none_for_missing_file(self):
-        assert read_transcript_file("/nonexistent/path.jsonl") is None
-
-    def test_returns_none_for_empty_path(self):
-        assert read_transcript_file("") is None
-
-    def test_returns_none_for_empty_file(self, tmp_path):
-        path = tmp_path / "empty.jsonl"
-        path.write_text("")
-        assert read_transcript_file(str(path)) is None
-
-    def test_returns_none_for_metadata_only(self, tmp_path):
-        content = _make_jsonl(METADATA_LINE, FILE_HISTORY)
-        path = tmp_path / "meta.jsonl"
-        path.write_text(content)
-        assert read_transcript_file(str(path)) is None
-
-    def test_returns_none_for_invalid_json(self, tmp_path):
-        path = tmp_path / "bad.jsonl"
-        path.write_text("not json\n{}\n{}\n")
-        assert read_transcript_file(str(path)) is None
-
-    def test_no_size_limit(self, tmp_path):
-        """Large files are accepted — bucket storage has no size limit."""
-        big_content = {"type": "user", "uuid": "u9", "data": "x" * 1_000_000}
-        content = _make_jsonl(METADATA_LINE, FILE_HISTORY, big_content, ASST_MSG)
-        path = tmp_path / "big.jsonl"
-        path.write_text(content)
-        result = read_transcript_file(str(path))
-        assert result is not None
-
-
 # --- write_transcript_to_tempfile ---
 
 
@@ -155,12 +111,56 @@ class TestValidateTranscript:
         assert validate_transcript(content) is False
 
     def test_assistant_only_no_user(self):
+        """With --resume the user message is a CLI query param, not a transcript entry.
+        A transcript with only assistant entries is valid."""
         content = _make_jsonl(METADATA_LINE, FILE_HISTORY, ASST_MSG)
-        assert validate_transcript(content) is False
+        assert validate_transcript(content) is True
+
+    def test_resume_transcript_without_user_entry(self):
+        """Simulates a real --resume stop hook transcript: the CLI session file
+        has summary + assistant entries but no user entry."""
+        summary = {"type": "summary", "uuid": "s1", "text": "context..."}
+        asst1 = {
+            "type": "assistant",
+            "uuid": "a1",
+            "message": {"role": "assistant", "content": "Hello!"},
+        }
+        asst2 = {
+            "type": "assistant",
+            "uuid": "a2",
+            "parentUuid": "a1",
+            "message": {"role": "assistant", "content": "Sure, let me help."},
+        }
+        content = _make_jsonl(summary, asst1, asst2)
+        assert validate_transcript(content) is True
+
+    def test_single_assistant_entry(self):
+        """A transcript with just one assistant line is valid — the CLI may
+        produce short transcripts for simple responses with no tool use."""
+        content = json.dumps(ASST_MSG) + "\n"
+        assert validate_transcript(content) is True
 
     def test_invalid_json_returns_false(self):
         assert validate_transcript("not json\n{}\n{}\n") is False
 
+    def test_malformed_json_after_valid_assistant_returns_false(self):
+        """Validation must scan all lines - malformed JSON anywhere should fail."""
+        valid_asst = json.dumps(ASST_MSG)
+        malformed = "not valid json"
+        content = valid_asst + "\n" + malformed + "\n"
+        assert validate_transcript(content) is False
+
+    def test_blank_lines_are_skipped(self):
+        """Transcripts with blank lines should be valid if they contain assistant entries."""
+        content = (
+            json.dumps(USER_MSG)
+            + "\n\n"  # blank line
+            + json.dumps(ASST_MSG)
+            + "\n"
+            + "\n"  # another blank line
+        )
+        assert validate_transcript(content) is True
+
 
 # --- strip_progress_entries ---
 
@@ -253,3 +253,32 @@ class TestStripProgressEntries:
         assert "queue-operation" not in result_types
         assert "user" in result_types
         assert "assistant" in result_types
+
+    def test_preserves_original_line_formatting(self):
+        """Non-reparented entries keep their original JSON formatting."""
+        # Use pretty-printed JSON with spaces (as the CLI produces)
+        original_line = json.dumps(USER_MSG)  # default formatting with spaces
+        compact_line = json.dumps(USER_MSG, separators=(",", ":"))
+        assert original_line != compact_line  # precondition
+
+        content = original_line + "\n" + json.dumps(ASST_MSG) + "\n"
+        result = strip_progress_entries(content)
+        result_lines = result.strip().split("\n")
+
+        # Original line should be byte-identical (not re-serialized)
+        assert result_lines[0] == original_line
+
+    def test_reparented_entries_are_reserialized(self):
+        """Entries whose parentUuid changes must be re-serialized."""
+        progress = {"type": "progress", "uuid": "p1", "parentUuid": "u1"}
+        asst = {
+            "type": "assistant",
+            "uuid": "a1",
+            "parentUuid": "p1",
+            "message": {"role": "assistant", "content": "done"},
+        }
+        content = _make_jsonl(USER_MSG, progress, asst)
+        result = strip_progress_entries(content)
+        lines = result.strip().split("\n")
+        asst_entry = json.loads(lines[-1])
+        assert asst_entry["parentUuid"] == "u1"  # reparented