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fix: strip orphaned tool_result messages after conversation truncation #416

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Merged
yaojin3616 merged 1 commit into from
Apr 16, 2026
Merged

fix: strip orphaned tool_result messages after conversation truncation #416

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7 changes: 6 additions & 1 deletion backend/app/api/websocket.py
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Original file line number Diff line number Diff line change
Expand Up @@ -515,10 +515,15 @@ async def _call_with_failover():
async def _on_failover(reason: str):
await websocket.send_json({"type": "info", "content": f"Primary model error, {reason}"})

# To prevent tool call message pairs(assistant + tool) from being broken down.
_truncated = conversation[-ctx_size:]
while _truncated and _truncated[0].get("role") == "tool":
_truncated.pop(0)

return await call_llm_with_failover(
primary_model=llm_model,
fallback_model=fallback_llm_model,
messages=conversation[-ctx_size:],
messages=_truncated,
agent_name=agent_name,
role_description=role_description,
agent_id=agent_id,
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