langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- PIIMiddleware: PIIMatch not exported from public package, and docs use wrong field names for custom detectors
- Structured output with a raw JSON-schema dict is never validated, making ToolStrategy's handle_errors retry unreachable for dict schemas
- `convert_runnable_to_tool` wraps TypedDict input in `RootModel` causing OpenAI tool calls to fail
- _resolve_schemas processes a repeated state schema at its FIRST position, so the explicit state_schema can lose field conflicts to middleware
- Bug: get_num_tokens_from_messages raises NotImplementedError for OpenAI o1 and o3 models
- Related to #31887 (custom header pattern support)
- Bug: streaming tool call fires prematurely when first SSE chunk has empty args
- `ChatAnthropic`: support a callable / token-provider for `api_key` (auto-refreshing credentials, e.g. Azure Entra ID) like `ChatOpenAI` does
- Bug 1: Uncaught `KeyError` DoS via malformed content blocks in `BaseMessage.content_blocks`
- Mistral streaming tool-call chunks with index 0 generate inconsistent IDs
- Docs
- Python not yet supported