check-skill-spec

name	check-skill-spec
description	Compare the agentskills.io specification against this project's extended frontmatter allowlist to determine whether the custom validation hook (scripts/check_skill_frontmatter.py) is still needed. Use this skill when checking if the upstream spec has adopted the extended fields, when planning to remove the custom hook, or when a new spec release is announced.
user-invocable	true
metadata	{"author":"ai-forge","version":"1.0"}

Check Skill Spec Alignment

Determine whether the custom frontmatter validation hook can be retired in favor of skillmark's built-in E030 rule.

Context

This project uses a custom pre-commit hook (scripts/check_skill_frontmatter.py) that validates SKILL.md frontmatter against the agentskills.io spec plus extended fields that Claude Code and VS Code support but the spec has not yet adopted. Skillmark's E030 is disabled in .skillmark.toml because it rejects these fields.

The extended fields are:

Field	Purpose	Tracking
user-invocable	Controls / menu visibility	agentskills#105
argument-hint	Autocomplete hint for arguments	agentskills#105
disable-model-invocation	Prevents agent auto-triggering	agentskills#105
triggers	Invocation phrases for discovery	agentskills#105

Workflow

Step 1: Fetch the current spec

Read the upstream specification:

curl -sL https://raw.githubusercontent.com/agentskills/agentskills/main/docs/specification.mdx

Extract the frontmatter field table from the spec. Look for the ### Frontmatter section and the table listing Field | Required | Constraints.

Step 2: Compare against our allowlist

Read scripts/check_skill_frontmatter.py and compare:

• _SPEC_FIELDS — should match what the upstream spec lists
• _EXTENDED_FIELDS — check if any of these now appear in the upstream spec

Step 3: Check the tracking issue

gh issue view 105 --repo agentskills/agentskills --json state,title,comments

Check whether issue #105 has been closed/merged, or if there are updates indicating the fields have been adopted.

Step 4: Check skillmark releases

gh release list --repo michellepellon/skillmark --limit 5

Check whether a newer version of skillmark recognizes the extended fields in its E030 rule. If so, test by temporarily re-enabling E030:

skillmark check --disable "" SKILL.md

Step 5: Report findings

Produce a summary with one of these verdicts:

• Still needed — the spec has not adopted the extended fields; keep the custom hook and E030 disabled.
• Partially resolved — some fields are now in the spec; update _SPEC_FIELDS and _EXTENDED_FIELDS accordingly.
• Can be retired — all extended fields are in the spec and skillmark recognizes them. Follow the retirement steps below.

Retirement steps (when verdict is "Can be retired")

1. Update .skillmark.toml: remove E030 from the disable list
2. Remove scripts/check_skill_frontmatter.py
3. Remove the check-skill-frontmatter hook from .pre-commit-config.yaml
4. Remove this skill (.agents/skills/check-skill-spec/)
5. Run tox -e lint to verify everything passes with E030 re-enabled
6. Commit and create a PR