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Anthropic's API rejects `tool_use`/`tool_result` IDs that don't match `^[a-zA-Z0-9_-]+$` with a 400. When a conversation thread is replayed across providers — e.g. a user switches a running thread from Kimi (via Fireworks) to Claude — the prior turns carry tool-call IDs minted by the other provider (Kimi emits `functions.write_todos:0`, whose `.` and `:` are invalid), and the request fails. Tool-call IDs are now normalized to an Anthropic-compatible form during request formatting, with the original `tool_use.id` and its paired `tool_use_id` mapped identically so they stay linked.
langchain-anthropic
Looking for the JS/TS version? Check out LangChain.js.
Quick Install
pip install langchain-anthropic
🤔 What is this?
This package contains the LangChain integration for Anthropic's generative models.
📖 Documentation
For full documentation, see the API reference. For conceptual guides, tutorials, and examples on using these classes, see the LangChain Docs.
📕 Releases & Versioning
See our Releases and Versioning policies.
💁 Contributing
As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
For detailed information on how to contribute, see the Contributing Guide.