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Enumerate edge cases against a concrete checklist before declaring code complete. Use when implementing or reviewing any function, handler, parser, or data transformation — after the happy path works, before reporting done.
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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 | edge-case-sweep |
| description | Enumerate edge cases against a concrete checklist before declaring code complete. Use when implementing or reviewing any function, handler, parser, or data transformation — after the happy path works, before reporting done. |
The happy path is the easy 80%. Sweep this list against every new or changed code path and either handle, explicitly reject, or consciously note each relevant case:
Inputs
"", [], {}, zero rows, zero-byte fileState & time
Environment
For each case that applies: decide handle vs reject-loudly. The unacceptable outcome is silent wrong behavior. If a case is deliberately unhandled, say so in the completion report — a stated limitation is fine, a hidden one is a bug report waiting.