Affected version
Reports that share this version, grouped in one feed.
When ModelFallbackMiddleware falls back to ChatAnthropicMantle (langchain-aws), cache_control markers are silently removed from both model_settings and message content blocks, disabling prompt caching and increasing costs. The root cause is a missing _llm_type in _ANTHROPIC_LLM_TYPES.
The @wrap_tool_call decorator does not accept or propagate a context_schema parameter, so the returned AgentMiddleware always types ContextT as None. When used with create_agent(context_schema=AgentContext), the invariant ContextT generic causes a type error, even though the runtime behavior may be correct.
LangChain, LlamaIndex, and Pydantic
Pinecone, Chroma, Weaviate, Qdrant, and neighboring stores
Next.js, Supabase, and the surrounding app stack