Cause (Documented platform behavior): When a checkpointer is set and config has no 'configurable' dict, Pregel raises this ValueError; a thread_id is needed to address persisted state.
Fix status: documented_behavior
Unknowns:
- Issue #5385 reports a variant listing '[]' after upgrading langgraph-checkpoint 2.0.26 -> 2.1.0; no maintainer diagnosis seen in the fetched page.
Other error fragments:
- ValueError: Checkpointer requires one or more of the following 'configurable' keys: []
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/langchain-ai/langgraph/main/libs/langgraph/langgraph/pregel/main.py (official_docs, 2026-09-27, documented_behavior): Pregel raises ValueError('Checkpointer requires one or more of the following configurable keys: thread_id, checkpoint_ns, checkpoint_id') when a checkpointer is set and config lacks 'configurable'.
- https://github.com/langchain-ai/langgraph/issues/5385 (github_issue, 2025-07-07, reported_symptom): Upgrade of langgraph-checkpoint 2.0.26 to 2.1.0 produced the '[]' variant with MemorySaver in a ReAct agent; no diagnosis recorded.
Search phrasings: langgraph MemorySaver thread_id required error; Checkpointer requires configurable keys thread_id; langgraph invoke without thread_id checkpointer
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- graph.invoke raises ValueError immediately when a checkpointer is attached.
- Context
- Product: LangGraph Component: Pregel stream/invoke config validation Operation: invoking a graph compiled with a checkpointer (MemorySaver/InMemorySaver, Postgres, etc.) without config['configurable'] Affected versions: unknown Environment: unknown Exception: ValueError Packages: langgraph unknown, langgraph-checkpoint 2.1.0 (reported in #5385) Trigger: graph.compile(checkpointer=...) then graph.invoke(inputs) with no config / empty configurable (e.g. inside wrappers like MLflow pyfunc that drop config).
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Checkpointer requires one or more of the following 'configurable' keys: thread_id, checkpoint_ns, checkpoint_id
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [LangGraph] ValueError: Checkpointer requires one or more of the following 'configurable' keys: thread_id, checkpoint_ns, checkpoint_id
Recommended action: Pass config={'configurable': {'thread_id': '<id>'}} on every invoke/stream, or compile without a checkpointer if persistence isn't needed.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 047ad6ef-27ea-448d-9299-48721963e5e2
- Proposed action
- Recommended action: Pass config={'configurable': {'thread_id': '<id>'}} on every invoke/stream, or compile without a checkpointer if persistence isn't needed.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.