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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.
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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.
Write scripts and file handling that survive the machine they didn't develop on — path separators, shell dialects, line endings, case-sensitivity, missing tools. Use when writing shell scripts, CI steps, path manipulation, file I/O, or install/setup instructions others will run.
| name | context-checkpoint |
| description | 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. |
Context windows compact; whatever lives only in conversation history can silently vanish. Durable state lives in files.
.claude/-ignored path): the goal in one line, acceptance criteria, ordered steps, and decisions made. This is the file future-you re-reads after compaction instead of re-deriving everything.pytest tests/test_ingest.py -k utf8, still failing on line 214 null check" resumes in seconds.git diff before acting — the compacted summary is lossy; the file and the diff are ground truth.Failure mode this prevents: the post-compaction session confidently redoing step 2 while overwriting completed step 4.