skill-staleness-check

name	skill-staleness-check
description	Evaluate intent skills for staleness when source files change in upstream TanStack package repos. Matches changed files against metadata.sources, evaluates whether diffs affect documented behavior, rewrites stale skills using skill-generate, checks cross-skill references, and opens PRs. Silent when nothing needs updating.
metadata	{"version":"1.0","category":"meta-tooling","input_artifacts":["webhook payload (package name, commit SHA, changed files)"],"output_artifacts":["updated SKILL.md files","pull requests"],"skills":["skill-generate","skill-tree-generator"]}

Skill Staleness Check

You are a coding agent. Your job is to evaluate whether intent skills are stale after upstream source changes, and if so, update them and open PRs. You act autonomously end-to-end. PRs contain already-updated skill content, not suggestions.

If nothing needs updating, exit silently. No PR, no notification.

---

Inputs

Webhook payload from an upstream package repo merge to main:

{
  "package": "@tanstack/query",
  "sha": "abc123",
  "changed_files": ["docs/framework/react/guides/queries.md", "src/query.ts"]
}

---

Step 1 — Match changed files to skills

Read all SKILL.md files under packages/intent/skills/. For each skill, extract sources from the frontmatter.

Match changed_files from the webhook against sources entries across all skills. Source references use the format Owner/repo:relative-path and support glob patterns.

A skill is a candidate if any of its sources entries match a changed file.

If no skills match, exit silently.

Using intent stale

There is no separate sync script — intent stale [dir] [--json] is the real, existing staleness signal (see docs/cli/intent-stale.md). It is read-only: it reports drift, it does not write anything. For a given library:

intent stale packages/query --json

This reports:

• Library version drift (library_version in a skill's frontmatter vs the currently published version), classified major/minor/patch.
• Missing source SHAs recorded in that package's skills/sync-state.json (a conservative signal — it flags gaps in the stored SHA record, not actual remote content differences; see the doc's Notes section).

intent stale does not classify "needs regeneration" vs "version bump only" the way a dedicated sync tool might — that classification is this skill's own job, done in Step 2 below using the actual source diff, not intent stale's output alone.

---

Step 2 — Evaluate each candidate

For each matched skill:

1. Read the current SKILL.md content
2. Fetch the file diff from the triggering commit in the source repo
3. Classify the change:

Classification	Criteria	Action
No impact	Diff is typo fix, comment change, test-only, or internal refactor with no API/behavior change	Skip — no update needed
Version bump only	Diff changes version numbers, dependency ranges, or metadata but no documented behavior	Bump library_version in frontmatter
Content update	Diff changes API shape, behavior, defaults, types, or patterns that the skill documents	Rewrite affected sections
Breaking change	Diff removes, renames, or fundamentally changes an API the skill documents	Rewrite + add old pattern as Common Mistake

Two-pass classification

Pass 1 — Quick scan: Read the diff summary (files changed, insertions, deletions). Identify which skill sections could be affected.

Pass 2 — Detail evaluation: For each potentially affected section, read the full diff hunks and compare against the skill content. Determine if the change actually affects what the skill documents.

This prevents over-updating. A 200-line diff to a source file may only affect one line of one skill, or none at all.

---

Step 3 — Update stale skills

For skills classified as needing content updates:

1. Load the skill-generate meta skill
2. Provide it with:
   • The existing SKILL.md content
   • The source diff
   • The current source documentation (fetch the updated file)
3. Use regeneration mode (surgical update, not full rewrite)
4. Validate the updated skill against all checks

For version bump only:

There is no write-capable script for this. Edit library_version directly in each affected skill's frontmatter, then update the recorded SHA(s) for that library in its skills/sync-state.json (see Step 5) to reflect the new synced state.

---

Step 4 — Check cross-skill references

After updating skills in Step 3, check for cross-skill staleness:

1. For each skill that was updated, read its name
2. Scan all other skills for requires entries or sources that reference the updated skill
3. For each skill that references an updated skill, evaluate whether the update makes the referencing skill stale or inconsistent
4. If stale → update using the same process as Step 3
5. If not → skip

This cascade is bounded to one level. Skills that reference a second-order dependency are not automatically re-checked.

---

Step 5 — Mark skills as synced

There is no write-capable script for this either. After updating a skill, edit that library's skills/sync-state.json directly: update library_version and the affected skill's skills[skillName].sources_sha map with the new source file SHA(s) from the commit that triggered this run. (That is the real current shape read by intent stale — it has no separate tree-generator SHA or sync-timestamp field, despite what an earlier version of this doc implied.)

---

Step 6 — Open PRs

For each skill (or group of skills) that was updated:

1. Create branch: skill-update/<skill-name>-<short-sha>
2. Commit updated SKILL.md file(s)
3. Open PR with structured body

PR format

Title: skill: update <skill-name> (<package>@<short-sha>)

Body:

### Triggered by

Changes to: <list of source files that matched>

### What changed in the source

<summary of the diff — 2–3 sentences max>

### What changed in the skill

<summary of skill edits — which sections were updated and why>

### Cross-skill impact

<list any downstream skills checked; note if PRs were opened for them>

### Review checklist

- [ ] Skill content is accurate
- [ ] Code examples are complete and copy-pasteable
- [ ] No other skills need corresponding updates
- [ ] Under 500 lines

Grouping PRs

• If multiple skills for the same library are affected by the same commit, group them in a single PR
• If a cross-skill update is needed (Step 4), open a separate PR for the downstream skill to keep review scopes clean
• Never mix skills from different libraries in the same PR

---

No-op behavior

Exit silently (no PR, no notification, no issue) when ANY of these are true:

• No changed files match any skill's sources
• All matched diffs are classified as "no impact" in Step 2
• intent stale reports all skills up-to-date (All skills up-to-date, per docs/cli/intent-stale.md)

---

Operational notes

GitHub API usage

This skill (not a separate script) uses the gh CLI directly for GitHub API access — fetching source diffs in Step 2 and opening PRs in Step 6. It requires:

• gh CLI installed and authenticated
• Read access to upstream TanStack package repos (query, router, db, form, table)
• Write access to the intent repo for creating branches and PRs

Rate limiting

When checking multiple libraries or many source files, this makes one API call per source file per skill during Step 2's diff fetch. For large batches, the GitHub API rate limit (5000 requests/hour for authenticated users) may apply. There is no batching or response caching in place — if this becomes an issue, add caching around the diff-fetch step.

Manual triggering

Maintainers can run the read-only staleness signal manually, outside the webhook-triggered flow:

# Check a specific library
intent stale packages/db

# JSON output
intent stale packages/db --json

This only reports drift (version drift, missing source SHAs) — it does not update sync-state.json or open PRs; those remain Step 5 and Step 6 of this skill's own workflow, done manually as described above.

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Constraints

Rule	Detail
Silent when nothing changes	No noise — exit cleanly if no updates needed
Surgical updates over full rewrites	Only change sections affected by the diff
One cascade level	Cross-skill checks go one level deep, not recursive
PRs scoped to one library	Never mix libraries in a single PR
Version bumps are separate from content updates	A version-only bump doesn't require regeneration
Commit messages include co-author	Include the coding agent's co-author tag