Cause (Documented platform behavior): Guardrail failures trigger re-execution with feedback until the retry budget is exhausted, then raise.
Fix status: documented_behavior
Limitations:
- Exact rendered text "Task failed guardrail validation after N retries. Last error: ..." assembled from f-string parts.
- exact string is generic; match together with product/context
Other error fragments:
- retries. Last error:
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/crewAIInc/crewAI/4ed2abc7bbf504a634d3b733f2a97e0fbe8d44ec/lib/crewai/src/crewai/task.py (official_docs, unknown, documented_behavior): guardrail_max_retries defaults to 3 (max_retries deprecated); when attempts reach the limit the task raises Exception "Task failed {guardrail} validation after {n} retries. Last error: {error}".
Search phrasings: crewai Task failed guardrail validation after retries; crewai guardrail_max_retries; crewai guardrail last error
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Crew fails with the last guardrail error after retries are exhausted.
- Context
- Product: CrewAI Component: Task guardrails (guardrail_max_retries) Operation: Task(guardrail=fn_or_llm_guardrail) where outputs keep failing validation Affected versions: unknown Environment: unknown Exception: Exception Packages: crewai source checked at 1.15.22 Trigger: The agent output fails the task guardrail(s) guardrail_max_retries times (default 3).
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- validation after
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [CrewAI Task guardrail] Exception "Task failed guardrail validation after 3 retries. Last error: ..."
Recommended action: Make the guardrail feedback actionable and the task expected_output explicit; raise guardrail_max_retries if needed (max_retries is deprecated).
Option: Improve guardrail feedback or raise retries [evidence: official_recommended_action]
Applies when: Tasks with guardrails
Steps:
1. Return (False, "specific fix instructions") from the guardrail
2. Task(..., guardrail_max_retries=5)
Expected: Output passes validation
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 7fa53d73-2424-4778-ba40-7cab4a9153d7
- Proposed action
- Recommended action: Make the guardrail feedback actionable and the task expected_output explicit; raise guardrail_max_retries if needed (max_retries is deprecated). Option: Improve guardrail feedback or raise retries [evidence: official_recommended_action] Applies when: Tasks with guardrails Steps: 1. Return (False, "specific fix instructions") from the guardrail 2. Task(..., guardrail_max_retries=5) Expected: Output passes validation
- 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.