hotfix(backend): use discriminator for credential matching in run_block (#11908)

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Nicholas Tindle <ntindle@users.noreply.github.com>
Co-authored-by: Nicholas Tindle <nicholas.tindle@agpt.co>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

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

@@ -1,10 +1,13 @@
 """Shared agent search functionality for find_agent and find_library_agent tools."""
 
+import asyncio
 import logging
 from typing import Literal
 
 from backend.api.features.library import db as library_db
 from backend.api.features.store import db as store_db
+from backend.data import graph as graph_db
+from backend.data.graph import GraphModel
 from backend.util.exceptions import DatabaseError, NotFoundError
 
 from .models import (
@@ -14,6 +17,7 @@ from .models import (
     NoResultsResponse,
     ToolResponseBase,
 )
+from .utils import fetch_graph_from_store_slug
 
 logger = logging.getLogger(__name__)
 
@@ -54,7 +58,28 @@ async def search_agents(
         if source == "marketplace":
             logger.info(f"Searching marketplace for: {query}")
             results = await store_db.get_store_agents(search_query=query, page_size=5)
-            for agent in results.agents:
+
+            # Fetch all graphs in parallel for better performance
+            async def fetch_marketplace_graph(
+                creator: str, slug: str
+            ) -> GraphModel | None:
+                try:
+                    graph, _ = await fetch_graph_from_store_slug(creator, slug)
+                    return graph
+                except Exception as e:
+                    logger.warning(
+                        f"Failed to fetch input schema for {creator}/{slug}: {e}"
+                    )
+                    return None
+
+            graphs = await asyncio.gather(
+                *(
+                    fetch_marketplace_graph(agent.creator, agent.slug)
+                    for agent in results.agents
+                )
+            )
+
+            for agent, graph in zip(results.agents, graphs):
                 agents.append(
                     AgentInfo(
                         id=f"{agent.creator}/{agent.slug}",
@@ -67,6 +92,7 @@ async def search_agents(
                         rating=agent.rating,
                         runs=agent.runs,
                         is_featured=False,
+                        inputs=graph.input_schema if graph else None,
                     )
                 )
         else:  # library
@@ -76,7 +102,32 @@ async def search_agents(
                 search_term=query,
                 page_size=10,
             )
-            for agent in results.agents:
+
+            # Fetch all graphs in parallel for better performance
+            # (list_library_agents doesn't include nodes for performance)
+            async def fetch_library_graph(
+                graph_id: str, graph_version: int
+            ) -> GraphModel | None:
+                try:
+                    return await graph_db.get_graph(
+                        graph_id=graph_id,
+                        version=graph_version,
+                        user_id=user_id,
+                    )
+                except Exception as e:
+                    logger.warning(
+                        f"Failed to fetch input schema for graph {graph_id}: {e}"
+                    )
+                    return None
+
+            graphs = await asyncio.gather(
+                *(
+                    fetch_library_graph(agent.graph_id, agent.graph_version)
+                    for agent in results.agents
+                )
+            )
+
+            for agent, graph in zip(results.agents, graphs):
                 agents.append(
                     AgentInfo(
                         id=agent.id,
@@ -90,6 +141,7 @@ async def search_agents(
                         has_external_trigger=agent.has_external_trigger,
                         new_output=agent.new_output,
                         graph_id=agent.graph_id,
+                        inputs=graph.input_schema if graph else None,
                     )
                 )
         logger.info(f"Found {len(agents)} agents in {source}")

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

@@ -32,6 +32,8 @@ class ResponseType(str, Enum):
     OPERATION_STARTED = "operation_started"
     OPERATION_PENDING = "operation_pending"
     OPERATION_IN_PROGRESS = "operation_in_progress"
+    # Input validation
+    INPUT_VALIDATION_ERROR = "input_validation_error"
 
 
 # Base response model
@@ -62,6 +64,10 @@ class AgentInfo(BaseModel):
     has_external_trigger: bool | None = None
     new_output: bool | None = None
     graph_id: str | None = None
+    inputs: dict[str, Any] | None = Field(
+        default=None,
+        description="Input schema for the agent, including field names, types, and defaults",
+    )
 
 
 class AgentsFoundResponse(ToolResponseBase):
@@ -188,6 +194,20 @@ class ErrorResponse(ToolResponseBase):
     details: dict[str, Any] | None = None
 
 
+class InputValidationErrorResponse(ToolResponseBase):
+    """Response when run_agent receives unknown input fields."""
+
+    type: ResponseType = ResponseType.INPUT_VALIDATION_ERROR
+    unrecognized_fields: list[str] = Field(
+        description="List of input field names that were not recognized"
+    )
+    inputs: dict[str, Any] = Field(
+        description="The agent's valid input schema for reference"
+    )
+    graph_id: str | None = None
+    graph_version: int | None = None
+
+
 # Agent output models
 class ExecutionOutputInfo(BaseModel):
     """Summary of a single execution's outputs."""

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

@@ -30,6 +30,7 @@ from .models import (
     ErrorResponse,
     ExecutionOptions,
     ExecutionStartedResponse,
+    InputValidationErrorResponse,
     SetupInfo,
     SetupRequirementsResponse,
     ToolResponseBase,
@@ -273,6 +274,22 @@ class RunAgentTool(BaseTool):
             input_properties = graph.input_schema.get("properties", {})
             required_fields = set(graph.input_schema.get("required", []))
             provided_inputs = set(params.inputs.keys())
+            valid_fields = set(input_properties.keys())
+
+            # Check for unknown input fields
+            unrecognized_fields = provided_inputs - valid_fields
+            if unrecognized_fields:
+                return InputValidationErrorResponse(
+                    message=(
+                        f"Unknown input field(s) provided: {', '.join(sorted(unrecognized_fields))}. "
+                        f"Agent was not executed. Please use the correct field names from the schema."
+                    ),
+                    session_id=session_id,
+                    unrecognized_fields=sorted(unrecognized_fields),
+                    inputs=graph.input_schema,
+                    graph_id=graph.id,
+                    graph_version=graph.version,
+                )
 
             # If agent has inputs but none were provided AND use_defaults is not set,
             # always show what's available first so user can decide

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

@@ -402,3 +402,42 @@ async def test_run_agent_schedule_without_name(setup_test_data):
     # Should return error about missing schedule_name
     assert result_data.get("type") == "error"
     assert "schedule_name" in result_data["message"].lower()
+
+
+@pytest.mark.asyncio(loop_scope="session")
+async def test_run_agent_rejects_unknown_input_fields(setup_test_data):
+    """Test that run_agent returns input_validation_error for unknown input fields."""
+    user = setup_test_data["user"]
+    store_submission = setup_test_data["store_submission"]
+
+    tool = RunAgentTool()
+    agent_marketplace_id = f"{user.email.split('@')[0]}/{store_submission.slug}"
+    session = make_session(user_id=user.id)
+
+    # Execute with unknown input field names
+    response = await tool.execute(
+        user_id=user.id,
+        session_id=str(uuid.uuid4()),
+        tool_call_id=str(uuid.uuid4()),
+        username_agent_slug=agent_marketplace_id,
+        inputs={
+            "unknown_field": "some value",
+            "another_unknown": "another value",
+        },
+        session=session,
+    )
+
+    assert response is not None
+    assert hasattr(response, "output")
+    assert isinstance(response.output, str)
+    result_data = orjson.loads(response.output)
+
+    # Should return input_validation_error type with unrecognized fields
+    assert result_data.get("type") == "input_validation_error"
+    assert "unrecognized_fields" in result_data
+    assert set(result_data["unrecognized_fields"]) == {
+        "another_unknown",
+        "unknown_field",
+    }
+    assert "inputs" in result_data  # Contains the valid schema
+    assert "Agent was not executed" in result_data["message"]

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

@@ -4,6 +4,8 @@ import logging
 from collections import defaultdict
 from typing import Any
 
+from pydantic_core import PydanticUndefined
+
 from backend.api.features.chat.model import ChatSession
 from backend.data.block import get_block
 from backend.data.execution import ExecutionContext
@@ -73,15 +75,22 @@ class RunBlockTool(BaseTool):
         self,
         user_id: str,
         block: Any,
+        input_data: dict[str, Any] | None = None,
     ) -> tuple[dict[str, CredentialsMetaInput], list[CredentialsMetaInput]]:
         """
         Check if user has required credentials for a block.
 
+        Args:
+            user_id: User ID
+            block: Block to check credentials for
+            input_data: Input data for the block (used to determine provider via discriminator)
+
         Returns:
             tuple[matched_credentials, missing_credentials]
         """
         matched_credentials: dict[str, CredentialsMetaInput] = {}
         missing_credentials: list[CredentialsMetaInput] = []
+        input_data = input_data or {}
 
         # Get credential field info from block's input schema
         credentials_fields_info = block.input_schema.get_credentials_fields_info()
@@ -94,14 +103,33 @@ class RunBlockTool(BaseTool):
         available_creds = await creds_manager.store.get_all_creds(user_id)
 
         for field_name, field_info in credentials_fields_info.items():
-            # field_info.provider is a frozenset of acceptable providers
+            effective_field_info = field_info
-            # field_info.supported_types is a frozenset of acceptable types
+            if field_info.discriminator and field_info.discriminator_mapping:
+                # Get discriminator from input, falling back to schema default
+                discriminator_value = input_data.get(field_info.discriminator)
+                if discriminator_value is None:
+                    field = block.input_schema.model_fields.get(
+                        field_info.discriminator
+                    )
+                    if field and field.default is not PydanticUndefined:
+                        discriminator_value = field.default
+
+                if (
+                    discriminator_value
+                    and discriminator_value in field_info.discriminator_mapping
+                ):
+                    effective_field_info = field_info.discriminate(discriminator_value)
+                    logger.debug(
+                        f"Discriminated provider for {field_name}: "
+                        f"{discriminator_value} -> {effective_field_info.provider}"
+                    )
+
             matching_cred = next(
                 (
                     cred
                     for cred in available_creds
-                    if cred.provider in field_info.provider
+                    if cred.provider in effective_field_info.provider
-                    and cred.type in field_info.supported_types
+                    and cred.type in effective_field_info.supported_types
                 ),
                 None,
             )
@@ -115,8 +143,8 @@ class RunBlockTool(BaseTool):
                 )
             else:
                 # Create a placeholder for the missing credential
-                provider = next(iter(field_info.provider), "unknown")
+                provider = next(iter(effective_field_info.provider), "unknown")
-                cred_type = next(iter(field_info.supported_types), "api_key")
+                cred_type = next(iter(effective_field_info.supported_types), "api_key")
                 missing_credentials.append(
                     CredentialsMetaInput(
                         id=field_name,
@@ -184,10 +212,9 @@ class RunBlockTool(BaseTool):
 
         logger.info(f"Executing block {block.name} ({block_id}) for user {user_id}")
 
-        # Check credentials
         creds_manager = IntegrationCredentialsManager()
         matched_credentials, missing_credentials = await self._check_block_credentials(
-            user_id, block
+            user_id, block, input_data
         )
 
         if missing_credentials: