Skill Authoring

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, ≤60 words, explain WHAT and WHEN
• Use WHEN: with quoted trigger phrases (preferred over USE FOR:)
• Avoid DO NOT USE FOR: unless the skill has trigger overlap with a broader skill (see frontmatter guidelines)
• Use inline double-quoted strings (not >- folded scalars)
• 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](references/file.md) load
• Link to files, not folders - [Recipes](references/recipes/README.md) not [Recipes](references/recipes/)
• Each file loads in full (not sections)
• No caching between requests - write self-contained files