Skill Authoring Guide

This skill provides guidance for writing Agent Skills that comply with the agentskills.io specification.

When to Use

• Creating a new skill for this repository

• Reviewing a skill PR for compliance

• Checking if an existing skill follows best practices

• Understanding token budgets and progressive disclosure

Constraints

• name : 1-64 chars, lowercase + hyphens, match directory

• description : 1-1024 chars, explain WHAT and WHEN

• SKILL.md: <500 tokens (soft), <5000 (hard)

• references/*.md: <1000 tokens each

Structure

• SKILL.md (required) - Instructions

• references/ (optional) - Detailed docs

• scripts/ (optional) - Executable code

Frontmatter: name (lowercase-hyphens), description (WHAT + WHEN)

Progressive Disclosure

Metadata (~100 tokens) loads at startup. SKILL.md (<5000 tokens) loads on activation. References load only when explicitly linked (not on activation). Keep SKILL.md lean.

Reference Loading

References are JIT (just-in-time) loaded:

• Only files explicitly linked via text load

• Each file loads in full (not sections)

• No caching between requests - write self-contained files

• Use recipes/services patterns for multi-option skills

See REFERENCE-LOADING.md for details.

Validation

Run from the scripts directory

cd scripts npm run tokens -- check plugin/skills/my-skill/SKILL.md

Reference Documentation

• GUIDELINES.md - Detailed writing guidelines

• REFERENCE-LOADING.md - How references load and token efficiency

• CHECKLIST.md - Pre-submission checklist

• agentskills.io/specification - Official spec