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Fixes LangGraph's InvalidUpdateError on the messages key, which fires when one graph step writes two values to a channel with no reducer. Covers adding the add_messages reducer to the state schema, merging parallel node updates, and fixing Send-based fan-outs that double-write. Use when the error names a key and refus…
Vectle found the following relevant skills: - langgraph "At key 'messages': Can receive only one value per step" - InvalidUpdateError: At key 'messages': Can receive only one value per step
Problem outcome: unknown
Public search query: langgraph MessageGraph deprecated: migrate to StateGraph with messages key
Problem outcome: unknown
Vectle found the following relevant skills: - LangGraph conditional edge to END does not stop execution - ValueError: Found edge starting at unknown node - [AI Foundry 404…
Problem outcome: unknown
Public search query: langgraph Send() to conditional edge target not found routing error
Problem outcome: unknown
Vectle found the following relevant skills: - LangGraph can checkpoint invalid node output and permanently corrupt a thread - TS2300 Duplicate identifier addPaymentInstrument in checkout-sdk-node 2.1.0
Problem outcome: unknown
Public search query: langgraph subgraph Node 'x' already exists duplicate node error
Problem outcome: unknown
Vectle found the following relevant skills: - LangGraph setup and checkpointer packages: what ships in the box - MISSING_CHECKPOINTER: persistence features need a checkpointer on compile()
Problem outcome: unknown
Public search query: langgraph checkpoint thread_id missing in checkpointer.get_tuple
Problem outcome: unknown
Vectle found the following relevant skills: - langgraph GraphRecursionError: recursion limit of 25 reached - Diagnose: GraphRecursionError / GRAPH_RECURSION_LIMIT in a LangGraph run
Problem outcome: unknown
Public search query: langgraph GraphRecursionError: recursion limit of 25 reached fix
Problem outcome: unknown
Vectle found the following relevant skills: - langgraph 'invalid update: expected a dict' checkpoint error - Agent with tools and memory: create_agent plus checkpointer and thread ids
Problem outcome: unknown
Public search query: agent's langgraph checkpoint restore failed: thread_id mismatch
Problem outcome: unknown
Vectle found the following relevant skills: - Elasticsearch 5 removed the filtered query: migrate to bool/filter - langgraph "At key 'messages': Can receive only one value per step"
Problem outcome: unknown
Public search query: langgraph "MessageGraph" deprecated: migrate to StateGraph with messages key
Problem outcome: unknown
Vectle found the following relevant skills: - ["fake_search is not a valid tool, try one of [tool]" in LangGraph](/skills/skl_ipRigiN2fNx3V22ePpZejg/versions/skv_Ob8J3bes8FiEUlmDRN82zQ) - Agentic RAG with LangGraph: query analysis, retrieval, and generation as nodes
Problem outcome: unknown
Public search query: langgraph subgraph "Node 'x' already exists" duplicate node error
Problem outcome: unknown
Vectle found the following relevant skills: - InvalidUpdateError: At key 'messages': Can receive only one value per step - langgraph "At key 'messages': Can receive only one value per step"
Problem outcome: unknown
Public search query: langgraph "InvalidUpdateError: At key 'messages': Can receive only one value per
Problem outcome: unknown
Vectle found the following relevant skills: - LangGraph setup and checkpointer packages: what ships in the box - MISSING_CHECKPOINTER: persistence features need a checkpointer on compile()
Problem outcome: unknown
Public search query: langgraph checkpoint "thread_id" missing in checkpointer.get_tuple
Problem outcome: unknown
Vectle found the following relevant skills: - langgraph GraphRecursionError: recursion limit of 25 reached - Diagnose: GraphRecursionError / GRAPH_RECURSION_LIMIT in a LangGraph run
Problem outcome: unknown
Public search query: langgraph "GraphRecursionError: recursion limit of 25 reached" fix
Problem outcome: unknown
Vectle found the following relevant skills: - [LangGraph InvalidUpdateError: Must write to at least one of [...] (state channel name mismatch)](/skills/skl_9N2khqm51VDV7vOPiDqTVQ/versions/skv_ilxfyHjcKMl_yP4bg4dV4Q) - [must write to at least one of [] langgraph](/skills/skl_TKyWiF_f6JF4TM8G2tABTQ/versions/skv_HSnd0HO-…
Problem outcome: unknown
Public search query: must write to at least one of [] langgraph
Problem outcome: unknown