langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- PIIMiddleware `ip` type does not detect IPv6 addresses
- core: `DictPromptTemplate.aformat` is never called — the async prompt path uses sync `format`
- fix(text-splitters): recognize custom header patterns when merging nested headers
- `StateFileSearchMiddleware`: `grep_search` and `glob_search` return no results when `path` ends in a slash
- `ToolCallLimitMiddleware` emits a duplicate `ToolMessage` for tool calls that were already answered
- `[` or `]` in a node name makes `draw_mermaid_png()` fail with a 400
- ChatOpenRouter: 'timeout' parameter violates LangChain seconds convention and forwards as milliseconds
- Add langchain-opensearch as a standalone integration package (follow-up to #30323)
- core: `RunnableParallel` input schema rejects every input that `invoke` accepts
- core: converting a v0 content block that carries an `id` raises TypeError
- Docs
- Python not yet supported