langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- Add OpenRouterEmbeddings to langchain-openrouter
- Bug: SummarizationMiddleware._find_safe_cutoff_point preserves orphan ToolMessages -> provider 400 on next call
- test_mset_chmod fails on Windows due to unsupported chmod permission bits
- Inconsistent `generations` shape in chat model streaming `on_llm_error` callbacks: emits `[[]]` and `[[chunk], []]` where every other path emits `[]`
- Stale `xfail` markers in `langchain-core` tests: `test_convert_to_openai_function_nested_v2` and `test_sync_in_sync_lambdas` pass but are marked expected-to-fail
- Public API for safe message retention cutoff
- Responses API with streaming and a nested Pydantic schema results in invalid strict JSON schema (additionalProperties/required missing on $defs)
- count_tokens_approximately over-counts audio/video/file blocks by char-counting their base64 payload
- Silent quality degradation in multi-agent flat round-table: 34.3/100 without synthesis node vs 86.3/100 with it
- VectorStore.add_texts silently truncates texts when len(ids) < len(texts)
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