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Skill Linter
skill-linter
Validate skills against agentskills.io specification. Use when adding new skills to the marketplace, reviewing skill PRs, checking skill compliance, or running quality gates on skills. Validates frontmatter fields (name, description, license, compatibility, metadata, allowed-tools), directory nam...
SKILL.md
Full skill instructions
Skill Linter
When to Use
- Adding new skills to the marketplace
- Reviewing skill PRs
- Running quality gates before merge
- Checking existing skills for compliance
Validation Rules
Required Frontmatter
| Field | Constraints |
|---|---|
name | 1-64 chars, lowercase alphanumeric + hyphens, no leading/trailing/consecutive hyphens, must match parent directory name |
description | 1-1024 chars, non-empty, should include keywords for discoverability |
Optional Frontmatter
| Field | Constraints |
|---|---|
license | Short license name or file reference |
compatibility | 1-500 chars, environment requirements |
metadata | Key-value pairs (string values only) |
allowed-tools | Space-delimited tool list |
Structure Requirements
| Rule | Requirement |
|---|---|
| Directory name | Must match name field exactly |
| SKILL.md | Required, must exist |
| Line limit | Max 500 lines in SKILL.md |
| Subdirectories | Only scripts/, references/, assets/ allowed |
Name Pattern
^[a-z][a-z0-9]*(-[a-z0-9]+)*$
Valid: my-skill, skill1, api-v2-handler
Invalid: -skill, skill-, my--skill, MySkill, my_skill
Usage
Validate Single Skill
./scripts/validate-skill.sh path/to/skill-name
Validate All Marketplace Skills
for skill in plugins/*/skills/*/; do
./scripts/validate-skill.sh "$skill"
done
CI Integration
Add to pre-commit hook or CI pipeline:
- name: Lint Skills
run: |
for skill in plugins/*/skills/*/; do
.claude/skills/skill-linter/scripts/validate-skill.sh "$skill" || exit 1
done
Validation Script
The linter script at scripts/validate-skill.sh performs these checks:
- Directory exists with SKILL.md file
- Frontmatter present with YAML delimiters
- Name field valid - pattern, length, matches directory
- Description field valid - present, length constraints
- Optional fields valid - if present, match constraints
- Line count - under 500 lines
- Subdirectory names - only allowed directories
Error Codes
| Code | Meaning |
|---|---|
| 0 | All validations passed |
| 1 | Missing SKILL.md |
| 2 | Invalid frontmatter |
| 3 | Name validation failed |
| 4 | Description validation failed |
| 5 | Optional field validation failed |
| 6 | Line limit exceeded |
| 7 | Invalid subdirectory |
Example Output
Validating: plugins/majestic-tools/skills/brainstorming
[PASS] SKILL.md exists
[PASS] Frontmatter present
[PASS] Name 'brainstorming' valid (12 chars)
[PASS] Name matches directory
[PASS] Description valid (156 chars)
[PASS] Line count: 87/500
[PASS] Subdirectories valid
Result: ALL CHECKS PASSED
Spec Reference
Based on agentskills.io/specification:
- Progressive disclosure - Metadata ~100 tokens at startup, full content <5000 tokens when activated
- Reference files - Keep one level deep from SKILL.md
- Token budget - Main SKILL.md recommended under 500 lines
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