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https://github.com/CopilotKit/CopilotKit.git
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Ben Taylor
cd0d38a073
## Description Fixes the LangGraph middleware "lying" to the agent about frontend tool execution (#4759). When a model turn calls a `useFrontendTool` handler, the middleware strips the FE tool calls so the backend `ToolNode` only runs calls it actually made, then rehydrates them afterward. Previously the rehydration could leave the restored AI message and its tool history inconsistent, so providers that require every tool call to have a matching result would break, and the agent saw an incorrect picture of what executed. ## Changes - `_restore_intercepted_tool_call_history` rebuilds the intercepted FE tool calls with synthetic `ToolMessage` results only for the restored model history (so providers that require every `tool_call` to have a result stay valid), and preserves the original AI message's `name`, `additional_kwargs`, and `response_metadata` on restore. - Tracks `original_tool_calls` in the CopilotKit private state so the original call set is restored exactly. ## Testing `uv run pytest tests/test_copilotkit_lg_middleware.py` — 68 passed, including new cases asserting the restored AI message keeps its tool-call ids, name, `additional_kwargs`, and `response_metadata`, and that tool results line up with their calls. Closes #4759 AI was used for assistance.
CopilotKit Python SDK
The official Python SDK for CopilotKit - build AI copilots and agents into your applications.
Features
- 🚀 Easy integration with LangGraph and LangChain
- 🔄 Built-in support for stateful conversations
- 🛠 Extensible agent framework
- 🔌 FastAPI-ready endpoints
- 🤝 Optional CrewAI integration
Installation
pip install copilotkit
With CrewAI support:
pip install "copilotkit[crewai]"
Quick Start
from copilotkit import Copilot
# Initialize a copilot
copilot = Copilot()
# Add your tools and configure the copilot
copilot.add_tool(my_custom_tool)
# Run the copilot
response = copilot.run("Your task description here")
Documentation
For detailed documentation and examples, visit copilotkit.ai
Contributing
We welcome contributions! Please see our Contributing Guidelines for details.
License
This project is licensed under the MIT License - see the LICENSE file for details.
Support
Built with ❤️ by the CopilotKit team