langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- ChatOpenRouter: max_retries=0 enables the SDK default retry policy
- v3 stream: parallel tool calls collide on the positional fallback key and one is silently dropped
- feat(openrouter,fireworks): support `response_format` on invoke and bind_tools
- feat: WalletForge x402 paid tools (fetch_markdown / normalize_text) for LangChain agents
- Feature: Support metadata-only updates in index() - avoid re-embedding when the content is unchanged
- feat(anthropic): forward credentials and auth_token to the anthropic client
- standard-tests: chat model tests never check the documented `total_tokens == input_tokens + output_tokens` invariant
- CommaSeparatedListOutputParser corrupts quoted CSV fields across streaming chunks
- Provider errors returned in a 200 response body are never classified
- langchain: 26 shell middleware unit tests fail on Windows (POSIX-only tests without platform guards)
- Docs
- Python not yet supported