skill-index-updater

name	skill-index-updater
description	Add GitHub skill repos to the ASM index: clone, audit, eval, regenerate index, rebuild catalog, open PR. Use when given GitHub URLs to onboard. Don't use for authoring (skill-creator), improving (skill-auto-improver), or install (asm install).
license	MIT
compatibility	Claude Code
allowed-tools	Bash Read Write Edit Grep Glob WebFetch Agent
effort	high
metadata	{"version":"1.3.0","author":"luongnv89"}

Skill Index Updater

You are adding new skill repository sources to the ASM (Agent Skill Manager) curated index. This is the pipeline that powers the skill catalog at https://luongnv.com/asm/ — every repo you add here becomes discoverable and installable by thousands of users.

Example

User: add github.com/anthropics/skills to the index
Skill output:
  Step 1: Parsed 1 URL → anthropics/skills (NEW)
  Step 2: Discovered 14 SKILL.md files
  Step 3: Audit OK on 14/14, eval scores 71–94
  Step 6–8: data/skill-index-resources.json + data/skill-index/anthropics_skills.json updated, catalog rebuilt
  Step 10: PR #312 opened — feat(index): add anthropics/skills (14 skills)

Repo Sync Before Edits (mandatory)

Before modifying any files, pull the latest remote branch:

branch="$(git rev-parse --abbrev-ref HEAD)"
git fetch origin
git pull --rebase origin "$branch"

If the working tree is dirty: stash, sync, then pop. If origin is missing or conflicts occur: stop and ask the user before continuing.

Input

The user provides one or more GitHub repository URLs. These can be in various formats:

• https://github.com/owner/repo
• github.com/owner/repo
• github:owner/repo
• owner/repo (shorthand)

Normalize all inputs to extract owner and repo.

Pipeline

Follow these steps in order. Each step has a verification check — do not proceed to the next step if verification fails.

Step 1: Parse and Validate Input URLs

For each URL provided:

1. Extract owner and repo from the URL
2. Verify the repository exists by checking https://api.github.com/repos/{owner}/{repo}
3. Check if the repo is already in data/skill-index-resources.json — if so, mark it for update instead of add

Output a summary table:

| # | Owner/Repo          | Status   | Notes                    |
|---|---------------------|----------|--------------------------|
| 1 | owner/repo          | NEW      | Will be added            |
| 2 | other/repo          | EXISTS   | Will be re-indexed       |
| 3 | bad/repo            | INVALID  | 404 - repo not found     |

If ALL repos are invalid, stop and tell the user.

Step 2: Discover Skills in Each Repository

For each valid repository, clone it to a temp directory and scan for SKILL.md files (up to 5 levels deep). This is what the ASM tool does internally, and we replicate the logic here:

# Clone to temp
TEMP_DIR=$(mktemp -d)
git clone --depth 1 "https://github.com/{owner}/{repo}.git" "$TEMP_DIR/{repo}"

# Find SKILL.md files (max 5 levels deep, matching ASM's discoverSkills)
find "$TEMP_DIR/{repo}" -maxdepth 5 -name "SKILL.md" -type f

discoverSkills (used by asm index ingest and preindex) indexes a root SKILL.md when present and continues scanning subdirectories for additional skills. A repo with both root and nested skills should list every skill in the index entry — not only the root.

For each discovered SKILL.md, parse the YAML frontmatter to extract:

• name (required)
• description (required)
• version (defaults to "0.0.0")
• license
• creator
• compatibility
• allowed-tools / allowedTools

Report how many skills were found per repo. If a repo has zero SKILL.md files, flag it and ask the user whether to still include it (it might have skills added later).

Step 3: Audit and Evaluate Discovered Skills

For each discovered skill, perform two checks — a lightweight audit and a quality evaluation using asm eval. Both run against the temp clone from Step 2; do not re-clone.

3a. Lightweight audit

1. Frontmatter completeness: Does it have at minimum name and description?
2. Content check: Does the SKILL.md have meaningful instruction content (not just frontmatter)?
3. Security scan: Check for suspicious patterns in the skill files:
   • Shell execution (exec, spawn, child_process, bash -c)
   • Network access (curl, wget, fetch(, axios)
   • Credential patterns (API_KEY=, SECRET_KEY=, PASSWORD=)
   • Obfuscation (atob(, base64 encoded strings, hex escape sequences)

This is a lightweight check — the full security audit runs when users install individual skills via asm install. The goal here is to catch obvious red flags before adding a repo to the curated index.

3b. Quality evaluation with asm eval

Run asm eval on each discovered skill directory and capture the JSON report. This gives reviewers a quality signal (structure, description, prompt engineering, safety, testability, naming) before the repo lands in the index, so they can spot obvious quality issues early:

asm eval "$TEMP_DIR/{repo}/{relPath}" --json

The JSON report contains overallScore (0-100), a letter grade (A/B/C/D/F), and a categories[] array with per-category scores. You do not need to re-run eval during indexing — npm run preindex (Step 7) invokes the evaluator via the ingester and writes evalSummary + tokenCount into data/skill-index/{owner}_{repo}.json automatically. The explicit run here is for pre-commit visibility only.

Combined report

Merge both checks into a single table so the user can see quality and safety at a glance:

Repo: owner/repo (N skills discovered)

  skill-name-1        OK     92 / A    name + description present, no security flags
  skill-name-2        WARN   58 / D    missing description
  skill-name-3        FLAG   71 / C    contains shell execution patterns (exec, spawn)

Columns: audit status, eval overallScore / grade, notes.

The current policy is permissive — accept all repos that have at least one valid skill (with name + description). Security warnings and low eval scores are informational only and do not block inclusion; they exist so the reviewer can make an informed call. If a user asks "should we really add this one?", point at the eval categories for specifics. This policy may become stricter in future versions.

Where the eval result ends up

After Step 7 regenerates the index, each skill entry in data/skill-index/{owner}_{repo}.json gains two derived fields:

• tokenCount: heuristic token estimate for the SKILL.md body
• evalSummary: { overallScore, grade, categories[], evaluatedAt, evaluatedVersion }

These power the "est. tokens" and "eval score" badges shown in the website catalog, the TUI, and asm inspect. No manual editing required — the ingester populates them as part of preindex.

Step 4: Check for Existing Repos to Update

For repos already in the index (EXISTS status from Step 1):

1. Compare the existing index file (data/skill-index/{owner}_{repo}.json) against freshly discovered skills
2. Report what changed:
   • New skills added
   • Skills removed
   • Skills with updated metadata (version, description, etc.)

Ask the user to confirm updates before proceeding.

Step 5: Create Feature Branch

Only proceed if there are legitimate new repos to add or existing repos to update.

git checkout -b feat/index-add-{repo-names}

Use a descriptive branch name. If adding multiple repos, abbreviate: feat/index-add-multiple-repos-{date}.

Step 6: Update skill-index-resources.json

For each NEW repo, add an entry to data/skill-index-resources.json in the repos array:

{
  "source": "github:{owner}/{repo}",
  "url": "https://github.com/{owner}/{repo}",
  "owner": "{owner}",
  "repo": "{repo}",
  "description": "{repo description from GitHub API}",
  "maintainer": "@{owner}",
  "enabled": true
}

Also update the updatedAt timestamp at the top level to the current ISO date.

Step 7: Generate Index Files

For each repo (new and updated), generate the index JSON file. Use the project's built-in preindex script if possible:

cd "$(git rev-parse --show-toplevel)"
npm run preindex

If npm run preindex fails or takes too long, generate the index file manually by creating data/skill-index/{owner}_{repo}.json with this structure:

{
  "repoUrl": "https://github.com/{owner}/{repo}.git",
  "owner": "{owner}",
  "repo": "{repo}",
  "updatedAt": "{ISO timestamp}",
  "skillCount": N,
  "skills": [
    {
      "name": "skill-name",
      "description": "Skill description from frontmatter",
      "version": "0.0.0",
      "license": "",
      "creator": "",
      "compatibility": "",
      "allowedTools": [],
      "installUrl": "github:{owner}/{repo}:{relative/path/to/skill}",
      "relPath": "relative/path/to/skill",
      "tokenCount": 0,
      "evalSummary": {
        "overallScore": 0,
        "grade": "F",
        "categories": [
          { "id": "structure", "name": "Structure & completeness", "score": 0, "max": 10 }
        ],
        "evaluatedAt": "{ISO timestamp}",
        "evaluatedVersion": "0.0.0"
      }
    }
  ]
}

The installUrl format matters — it's how asm install locates skills. For single-skill repos (SKILL.md at root), omit the path portion. For multi-skill repos, include the relative path to the skill directory.

If you fall back to manual generation, you can populate tokenCount and evalSummary by calling asm eval <path> --json on each skill directory and lifting the overallScore, grade, categories, evaluatedAt fields into the skill entry. When preindex succeeds, the ingester handles this for you automatically.

Step 8: Rebuild Website Catalog

Run the catalog build script to regenerate website/catalog.json:

npx tsx scripts/build-catalog.ts

Verify the output:

• website/catalog.json was updated
• Total skill count increased (or stayed the same for pure updates)
• No errors in the build output

Step 9: Verify Everything

Run a final check:

1. data/skill-index-resources.json is valid JSON and contains the new entries
2. Each new data/skill-index/{owner}_{repo}.json exists and is valid JSON
3. Each skill entry in those index files has tokenCount (number) and evalSummary (object with overallScore, grade, categories) populated — if any are missing, re-run npm run preindex or fall back to manual population as described in Step 7
4. website/catalog.json is valid JSON and includes the new skills
5. git diff --stat shows only the expected files changed

Report a summary to the user:

Added N new repo(s), updated M existing repo(s)
Total new skills indexed: X
Files changed: list of files

Ready to commit and create PR.

Step 10: Commit, Push, and Create PR

Stage and commit with the conventional commit format:

Note: website/catalog.json is gitignored and rebuilt by CI (deploy-website.yml) on merge. Do NOT stage it — only stage the data files.

git add data/skill-index-resources.json data/skill-index/*.json
git commit -m "feat(index): add {owner}/{repo} to curated skill index"

For multiple repos:

git commit -m "feat(index): add N new skill sources

Added:
- owner1/repo1 (X skills)
- owner2/repo2 (Y skills)
"

Push and create a PR:

git push -u origin HEAD
gh pr create --title "feat(index): add {description}" --body "$(cat <<'EOF'
## Summary
- Added N new skill repository source(s) to the curated index
- Total new skills: X

### New Repos
| Repo | Skills | Description |
|------|--------|-------------|
| [owner/repo](url) | N | description |

### Audit Summary
All skills passed the lightweight audit. No critical security flags.

## Test Plan
- [ ] `data/skill-index-resources.json` is valid JSON
- [ ] Index files generated in `data/skill-index/`
- [ ] `website/catalog.json` rebuilt successfully
- [ ] CI passes
EOF
)"

Edge Cases & Error Handling

Each row names a condition, the step that owns it, and the required response. When in doubt, surface the issue to the user rather than silently dropping a repo — the reviewer policy is permissive but transparent.

Condition	Response
Repo URL is a 404 / private repo	Mark INVALID in the Step 1 table and skip; don't abort if other URLs are valid.
Git clone fails	Skip that repo, report the error, continue with the others.
Repo has zero SKILL.md files	Flag it in Step 2 and ask whether to include anyway (some repos seed empty and add skills later).
Repo has 50+ SKILL.md files	Keep going, but warn about runtime — asm eval over many skills is slow.
Repo already in index, unchanged	Report EXISTS, no diff and skip index regeneration for that repo.
Repo already in index, breaking changes (skill removed/renamed)	Show a diff in Step 4 and require explicit user confirmation before overwriting.
npm run preindex missing or fails	Fall back to manual generation per Step 7; do not block the PR.
npx tsx scripts/build-catalog.ts fails	Stop in Step 8 — structural; a PR with a broken catalog must not land.
gh not authenticated	Prompt gh auth login; do not attempt to push without auth.
gh pr create fails (auth, network, missing remote)	Print the committed SHA so the user can push and open the PR manually.
Non-GitHub URL (GitLab, Bitbucket)	Reject in Step 1 — this skill only indexes github.com.
URL to a single skill subdirectory (.../tree/main/skills/foo)	Treat as the parent repo URL; let Step 2's discoverer pick up just that skill.

Cleanup

After completion, remove any temp directories used for cloning:

rm -rf "$TEMP_DIR"