skills: scheduler capability probe, stderr-sink diagnosis, schema-changeover validation - #1306
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…geover skills Three procedures extracted from a 2026-08-26 yukson failure and its verification: - scheduled-verification-with-session-fallback — probe scheduler CAPABILITY (command -v systemd-run + is-system-running + a real transient timer), not timer/cron INVENTORY. Reading 'list-timers is empty' as 'cannot schedule' produced a false durable-memory constraint and silently lost a session-bounded CronCreate reservation. Encodes the tier order and the rule: if systemd-run exists, do not use CronCreate. - cli-diagnostic-stderr-sink-detection — diagnose probes that misreport status because stderr was discarded; prefer exit codes, align test stubs, test both poles. - schema-change-mixed-data-validation — pin the changeover point from the source commit (git log -S / git show) rather than memory, segment records around it, and run a field-presence checklist so an absent field is not misread as failure. All three classified claude-only in the fail-closed codex catalog (codex mirror candidate, none exists yet), matching the #1284 precedent. Validation: ccc_codex_skills.py validate -> classified_assets=140 ok=true; frontmatter checks pass. Pre-existing on origin/main and unrelated to this change: scripts/setup.test.sh 'manifest hash drift: gh-pr-flow' (PASS=105 FAIL=1 reproduced on a clean origin/main checkout). Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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배경
2026-08-26 yukson에서 발생한 오판과 그 검증 과정에서 추출한 절차 3건입니다.
실패:
systemctl list-timers/crontab -l이 0건인 것을 "durable 스케줄 불가"로 오독했습니다. 인벤토리 조회를 능력 판정으로 쓴 것이 원인입니다. 그 결과 세션 한정 예약(CronCreate)을 선택했고, 세션이 발화 시각 전에 종료되면서 예약이 조용히 소실됐습니다(로그·에러·알림 없음). 거짓 제약은 durable 메모리에 5회, Wiki 승격 후보로 1회 전파됐습니다.실측 정정:
/usr/bin/systemd-run존재,systemctl is-system-running→running, 활성 타이머 7개 · crontab 23줄. 전이 타이머 생성·발화까지 확인했습니다.스킬
scheduled-verification-with-session-fallbackcommand -v systemd-run+is-system-running+ 실제 전이 타이머 생성).list-timers는 인벤토리 전용으로 명시. 4단계 우선순위와 "systemd-run이 있으면 CronCreate 금지" 규칙. 위 실패를 Evidence 절에 명기cli-diagnostic-stderr-sink-detectionschema-change-mixed-data-validationgit log -S/git show로 고정, 전후 세그먼트, 필드 존재 체크리스트 — 결측을 실패로 오독하지 않도록분류
3건 모두
skills/shared/배치 + fail-closed 카탈로그에claude-only(codex 미러 후보, 미존재)로 등록 — #1284 선례와 동일합니다.검증
python3 scripts/ccc_codex_skills.py validate→classified_assets=140, ok=true기존 결함(이 PR과 무관):
scripts/setup.test.sh의manifest hash drift: gh-pr-flow. 깨끗한origin/main체크아웃에서 동일하게PASS=105 FAIL=1로 재현됨을 확인했습니다.🤖 Generated with Claude Code