langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- AzureChatOpenAI._create_chat_result emits PydanticSerializationUnexpectedValue warnings for structured-output responses
- `HTMLSemanticPreservingSplitter` drops video/audio URLs from nested source tags
- ClearToolUsesEdit trigger semantics are degenerate with a persistent checkpointer — eviction re-fires every turn
- langchain-openrouter: `rs_*` reasoning IDs cause 404 on `/responses` replay across upstreams
- `create_agent` should support bounded forced retry after tool invocation validation errors
- RFC: track anthropic service tier and geo tokens
- Bug: Inflated Token Usage Reporting for accounts/fireworks/models/qwen3p6-plus with reasoning_effort="none"
- VideoContentBlock ValueError: Block of type video is not supported
- _to_protocol_usage drops input_token_details in v3 streaming path, causing cache token counts to always be 0
- feat(core,anthropic,openai): `aclose()` lifecycle + latched fallbacks
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