Create Skill

Create Skill

Required resources and checks

• Before using a starter, read and adapt [assets/skill-template.md](assets/skill-template.md). Replace every sentinel and remove unused sections.
• Before finalizing or reviewing, read [references/skill-quality-checklist.md](references/skill-quality-checklist.md). Record applicable evidence.
• When this catalog's root scripts exist, run:
• node scripts/validate-skill-metadata.mjs
• node scripts/validate-skill-links.mjs
• Otherwise perform equivalent checks manually. Report the unavailable gate.

Follow user and higher-priority constraints. Keep one coherent job. Preserve behavior outside an evidence-backed requested change.

Skill contract

• Put all activation guidance in frontmatter description. The body loads only after activation.
• Use: [Third-person capability]. Use this skill when [intents/triggers]. Do not use when/for [material near misses].
• Keep the description under 1024 characters. Focus on intent, outcomes, and adjacent boundaries—not mechanics.
• Keep SKILL.md concise and actionable. Put critical constraints, mandatory resources, fragile sequencing, validation, and safety early.
• Default to short headings, compact bullets, numbered procedures, and small tables. Use prose paragraphs only when they communicate necessary nuance more clearly.
• Keep each bullet focused on one instruction or tightly coupled behavior. Prefer direct wording; remove throat-clearing, repeated rationale, and paragraph-length bullets.
• Match the surrounding skill catalog's density. A longer main file requires execution-critical justification; move conditional detail into references/.
• Use progressive disclosure deliberately. Do not squeeze useful reusable detail into SKILL.md merely to avoid a resource.
• Use references/ for detailed workflows, schemas, examples, tool guidance, and gotchas.
• Use assets/ for reusable templates and static output shapes.
• Use scripts/ for repeated or fragile deterministic operations.
• Add resources when they improve repeated execution, clarity, consistency, or maintenance.
• Keep references one level deep.
• Add a resource pointer only after its file exists. Give its exact path, purpose, and read/use/run condition.
• Repeat mandatory resource loading at the relevant workflow step. Delete stale pointers and empty directories.
• Refer to other skills by name, such as create-plan. Do not use relative paths to their SKILL.md files.
• Ground changes in real tasks, artifacts, recurring failures, user corrections, or evaluation evidence.
• Reject one-off or speculative preferences. Prefer the smallest durable correction.
• Check tools, schemas, commands, and examples for staleness. Ask when reusability is unclear.
• Prescribe fragile, destructive, security-sensitive, and validation-critical sequences. Allow judgment elsewhere.

Workflow

1. Define observable use cases

• Record two or three realistic tasks.
• For each, record inputs, expected output, success criteria, and constraints.
• Record two or three strong near misses. Name the correct adjacent skill or direct workflow.
• For an existing skill, record reusable change evidence and the smallest durable correction.
• Do not broaden scope because related guidance is available.

2. Inspect the ecosystem

• Read the target skill and project instructions.
• Inspect nearby global and project skills, conventions, scripts, tools, and schemas.
• Identify duplicated policy and resource boundaries.
• Reuse good patterns. Do not copy generic advice or another skill's whole workflow.

3. Draft frontmatter first

• Write the description before the body.
• Include realistic user phrasing, useful co-activation, and material near misses.
• Use lowercase kebab-case for name. Keep it under 64 characters and match the directory.

4. Build the post-activation contract

• Include only rules needed after activation.
• Define critical constraints, sequence, resources, validation, failure handling, and safety.
• Remove redundant explanation, excessive menus, stale examples, vague guidance, and unrelated content.
• Perform a compression pass: shorten wording, split overloaded bullets, convert scannable prose to lists, and remove content that does not change execution.
• Create supporting resources when detail is reusable or would crowd the main file.
• Make scripts non-interactive. Support --help, bounded output, clear exit codes, and safe idempotent defaults.
• Require --dry-run or confirmation for destructive scripts.
• Print structured data to stdout and diagnostics to stderr. Document prerequisites.

5. Evaluate routing and execution

• Test three to five realistic should-trigger prompts and two to three strong near misses.
• Judge routing from the description alone. Expand cases only for broadly distributed or high-risk skills.
• Run one representative task with realistic input. Compare its output with the recorded success criteria.
• Prefer a fresh, safely available subagent for unbiased execution or review.
• Otherwise record the direct fallback and its independence limit. Treat child claims as evidence, not acceptance.
• Revise only material evidence-backed gaps. Rerun affected routing and output checks once.
• Do not build a benchmark framework for a small skill.

6. Validate and finalize

Run applicable checks from the repository root:

node scripts/validate-skill-metadata.mjs path/to/skill
node scripts/validate-skill-links.mjs path/to/skill
npx -y skills-ref validate path/to/skill

• Run each added or changed script's --help, focused tests, and one representative safe execution.
• Complete the quality checklist after the final revision.
• Report changed files, evaluated cases, exact results, skipped checks, reasons, and remaining risks.
• Never claim resources or artifacts that do not exist.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: maxedapps
• Source: maxedapps/agent-skills
• License: MIT

Install and usage instructions live in the source repository linked above.