ALEF-PAT-024

tool-desc-cache-break

cache × invisible-prompt-edit · severity 6 · confidence 0.85

Updating a tool description (a minor wording change) silently invalidates the LLM prompt cache, causing latency spike and cost increase.

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": "tool[0].description differs across resumes despite same workspace"
}

fix archetypes

static-description-dynamic-systemcost: medium
move per-environment list out of tool description into a separate system block that lives below cache breakpoint

compounds with

ALEF-PAT-023

cite as

# In a PR description / issue / RFC:
fixes pattern ALEF-PAT-024 (tool-desc-cache-break)
ref: https://n50.io/patterns/024

# Machine query:
GET https://n50.io/api/patterns/024

# Scan your repo for this pattern:
npx @alef-prime/audit-agent-system . --pattern=024