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Write errors and log lines that name the failing thing, the offending value, and the likely fix — for the 3am reader. Use whenever writing a throw/raise, a log statement, a validation message, or a CLI/API error response.
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SOC 職業分類に基づく
Resolve ambiguous requests by investigating, choosing the best-supported reading, and stating the interpretation — instead of guessing silently or blocking on questions. Use whenever a request has multiple plausible readings or an unstated parameter (which file, which env, how thorough, what format).
Treat any change to a public or shared interface — exported functions, HTTP endpoints, CLI flags, config formats, event/message schemas, DB schemas — as a contract change with consumers you can't see. Use before modifying anything other code depends on.
When recommending between options, match the strength of the claim to the strength of the evidence — commit when evidence is clear, say it's a coin flip when it is. Use whenever the user asks "which should I use", "what's the best way", "A or B?", or you're proposing a design choice.
Fast recon before changing unfamiliar code — instructions → manifest → tree → trace one flow end-to-end → git archaeology → imitate the newest precedent. Use when starting in a repo or module you haven't touched this session, or before designing against an existing architecture.
Async/concurrent/streaming discipline — five questions (overlapping runs, check-then-act, mutation across await, response ordering, cancellation), idempotent retries, shared-state audit, race amplification. Use for async fan-out, streams/SSE, jobs, caches, or flaky timing-smell bugs.
Externalize working state to files so long tasks survive context compaction and interruption. Use at the start of any task likely to exceed ~30 minutes or span many files, and again whenever a major phase completes or the plan changes.
| name | error-message-quality |
| description | Write errors and log lines that name the failing thing, the offending value, and the likely fix — for the 3am reader. Use whenever writing a throw/raise, a log statement, a validation message, or a CLI/API error response. |
Every error message is read at the worst possible moment by someone with no context. Write for that reader:
"config error: 'timeout' must be a positive integer, got '-5' in deploy.yaml" beats "invalid config" by an hour of someone's debugging. Include the identifiers: which file, which record ID, which endpoint, which of the twelve retries.raise X from e, %w, cause); when logging-and-continuing, log the exception with stack, not just "error occurred". An except-pass block is a crime scene with the evidence removed."payment declined: code=%s order=%s"), so the on-call can search logs and code for the same string. Don't dynamically assemble the constant part.Test: with only this message and no source access, could someone tell what to look at first? If not, it's missing a part.