ALEF-PAT-021

output-schema-no-loop-exit

execute × collapse · severity 7 · confidence 0.31

model voluntarily calls the structured-output tool but the agent loop treats it as "continue" and re-prompts — model calls the tool again, infinite loop

diagnosed in the wild

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healed by ALEF

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cited in posts

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observable signature

{
  "behavior": "stopReason=toolUse AND tool.name==structured_output_tool AND loop continues"
}

verified instances (1) — from the catalog

2026-05-18T13:25JackYPCOnline/sdk-typescript#16@Ilya0527

fix archetypes

terminate-on-structured-toolcost: tiny
if last tool call name == structured_output_tool, finalize(tool.input); do not re-prompt

compounds with

ALEF-PAT-010

cite as

# In a PR description / issue / RFC:
fixes pattern ALEF-PAT-021 (output-schema-no-loop-exit)
ref: https://n50.io/patterns/021

# Machine query:
GET https://n50.io/api/patterns/021

# Scan your repo for this pattern:
npx @alef-prime/audit-agent-system . --pattern=021