Cause (Documented platform behavior): Flow runtime counts calls per listener and raises when the count exceeds max_method_calls.
Fix status: documented_behavior
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/crewAIInc/crewAI/4ed2abc7bbf504a634d3b733f2a97e0fbe8d44ec/lib/crewai/src/crewai/flow/runtime/__init__.py (official_docs, unknown, documented_behavior): Listener execution increments a per-method counter and raises RecursionError when it exceeds max_method_calls (Field default 100), noting @listen labels matching the method name as a common cause.
Search phrasings: crewai flow has been called times indicates an infinite loop; crewai listen label same as method name recursion; crewai flow max_method_calls
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Flow kickoff aborts with RecursionError after the same method runs repeatedly.
- Context
- Product: CrewAI Component: Flow runtime listener execution (max_method_calls) Operation: Flow with @listen/@router cycles, e.g. @listen("process") def process(self): ... Affected versions: unknown Environment: unknown Exception: RecursionError Packages: crewai source checked at 1.15.22 Trigger: A listener re-triggers itself (its @listen label equals its own method name or a router label with the same name), or a router loop never exits, exceeding max_method_calls (default 100).
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- times in this flow execution, which indicates an infinite loop. This commonly happens when a @listen label matches the method's own name.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [CrewAI Flows] RecursionError "Method 'x' has been called 100 times in this flow execution, which indicates an infinite loop" (@listen label matching the method name)
Recommended action: Rename router outputs/labels so they do not equal the listening method name; add a loop exit; raise max_method_calls only for intentional long loops.
Option: Rename the label or add an exit condition [evidence: official_recommended_action]
Applies when: Flows with routers/listeners
Steps:
1. @router(...) returns "needs_processing"; @listen("needs_processing") def process(self)
Expected: Listener runs once per trigger
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 968b6cb4-fe9b-4ba5-b0cd-01c9f154c478
- Proposed action
- Recommended action: Rename router outputs/labels so they do not equal the listening method name; add a loop exit; raise max_method_calls only for intentional long loops. Option: Rename the label or add an exit condition [evidence: official_recommended_action] Applies when: Flows with routers/listeners Steps: 1. @router(...) returns "needs_processing"; @listen("needs_processing") def process(self) Expected: Listener runs once per trigger
- 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.