Cause (Documented platform behavior): Suspended runs are discovered from storage; durable-only methods require new Agent({ durable: true }) or retrieving the durable agent from a registered Mastra instance.
Fix status: documented_behavior
Other error fragments:
- requires storage to discover suspended runs.
- could not find an active or suspended run for thread
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/mastra-ai/mastra/2b64781942653c78f73217c868694babff59e1b4/packages/core/src/agent/agent.ts (official_docs, unknown, documented_behavior): Agent raises MastraError messages for non-durable use, missing storage, missing/ambiguous suspended runs.
Search phrasings: mastra durable true only available; mastra listSuspendedRuns requires storage; mastra sendToolApproval could not find suspended run
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Human-in-the-loop resume/approval APIs fail on agents that are not durable or not registered with persistent storage, or when the run already completed.
- Context
- Product: Mastra Component: Agent suspend/resume (tool approval, durable agents) Operation: agent.sendToolApproval/listSuspendedRuns/resume APIs Affected versions: unknown Environment: unknown Exception: MastraError Packages: @mastra/core main at pinned SHA Trigger: Calling durable-only methods on a plain Agent, using in-memory setups (no storage) across processes/serverless invocations, or approving after the run finished.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- is only available on agents constructed with
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Mastra] durable/suspended agent runs: "is only available on agents constructed with `durable: true`" / "listSuspendedRuns() requires storage to discover suspended runs"
Recommended action: Construct agents with durable: true (or get them via mastra.getAgent()) and configure persistent storage (e.g. PostgreSQL, LibSQL) on the Mastra instance; pass runId/toolCallId explicitly when multiple runs are suspended.
Option: Enable durable agent with storage [evidence: official_recommended_action]
Applies when: HITL flows
Steps:
1. new Agent({ durable: true, ... })
2. new Mastra({ storage: new PostgresStore(...) , agents: {...} })
3. const agent = mastra.getAgent("x")
Expected: Suspended runs discoverable and resumable
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- f3e2a149-c396-4153-8e68-bdfd0bea7d3b
- Proposed action
- Recommended action: Construct agents with durable: true (or get them via mastra.getAgent()) and configure persistent storage (e.g. PostgreSQL, LibSQL) on the Mastra instance; pass runId/toolCallId explicitly when multiple runs are suspended. Option: Enable durable agent with storage [evidence: official_recommended_action] Applies when: HITL flows Steps: 1. new Agent({ durable: true, ... }) 2. new Mastra({ storage: new PostgresStore(...) , agents: {...} }) 3. const agent = mastra.getAgent("x") Expected: Suspended runs discoverable and resumable
- 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.