---
name: skill-update
description: Update one existing skill in the jsc skill set. List all skills from the Gitea canonical marketplace (cloning any missing domain repo) and let the user pick one, ask update details via decision tree, apply the change, then re-check against the guidelines checklist until it passes and open a PR via jsc-git pr. Use for modifying a single skill; not for creating (skill-new), not for removing (skill-delete), and not for a change spanning several skills or domains (skillset-update).
---

# skill-update — update a skill

Single source of guidelines: [`../../references/guidelines.md`](../../references/guidelines.md).

## Flow

1. Run `tools/sync-domains.sh` to sync every domain repo of the Gitea canonical marketplace. Completion condition: the script exits 0 and prints one `domain<TAB>path` line per marketplace domain — exit 0 is the only code that means every repo is present and current. Exit 3 means some repos were not updated: reconcile every path named on stderr (commit or stash the dirty tree, or fix the failing pull) and rerun; when the user confirms a dirty tree is intentional local work, record that decision and continue on the local version — never read exit 3 as current. Exit 2 means a domain could not be cloned and exit 1 means the canonical marketplace was unreadable — resolve either before continuing.
2. Run `tools/list-skills.sh` and present its `domain / name / description` rows to the user. The tool prints skills, not domains, so read the domain column to prove coverage. Completion condition: every domain printed by step 1 appears in at least one row; a domain with no row means its repo is missing or holds no skill — return to step 1 for that domain.
3. Let the user pick the skill to update. Completion condition: one `{domain}/{name}` pair is confirmed.
4. Ask for update details via the `jsc-ask:ask` decision tree (change the goal? the trigger? the flow? move rules down to a hook or a tool?). Every option states its impact scope (example: renaming breaks the existing invocation command). Completion condition: every question has a recorded answer.
5. Update the skill — the modification part MUST run as a sub agent: modify SKILL.md and related files. Then run `tools/sync-skill-manifest.sh {domain-path}` directly (no sub agent needed) to sync the domain README's 「Skills 目錄」 section and bump the version in all three manifests. Completion condition: the skill files carry the change and all three manifests show the same new version.
6. Check every item of the guidelines.md audit checklist. On any failure, **return to step 4**: ask again and fix, until all items pass. Completion condition: every checklist item passes.
7. Call `jsc-git:pr` to open a Push Request. Completion condition: a PR URL comes back.