langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- Bug: _consolidate_calls if/elif chain broken and UnboundLocalError on unknown tool names
- `trim_messages` breaks when `token_counter` is a per-message callable (lambda, subclass annotation, or postponed annotations)
- fix(openai): omit `timeout` from `client_params` when not set by user
- fix(anthropic): omit `timeout` from `client_params` when not set by user
- fix(core): fix `trim_messages` misclassification of per-message token_counter
- ChatOpenAI/ChatAnthropic: request_timeout=None (default) disables SDK timeout, causing infinite hangs
- fix(core): prevent inflated token counts when merging streaming usage_metadata
- count_tokens_approximately: missing handler for tool_use content blocks causes ~2.4x overcounting
- MCP Header Forwarding Failure (Discovery Phase)
- fix(langchain)!: default to `google_genai` instead of `google_vertexai`
- Docs
- Python not yet supported