langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- 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
- gpt-5.4+ models not detected as Responses API models, causing tool_choice.function error
- 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`
- Inconsistent multimodal image format: JS camelCase vs Python snake_case
- fix(core): prevent duplicate ids kwarg in add_documents and aadd_documents
- fix(text-splitters): lazy-import nltk/spacy/sentence-transformers to avoid ~700MB memory bloat
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- Python not yet supported