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/skill-writer

@5a64b36 official
by Sentrygetsentry/skills1k stars
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Create, synthesize, and iteratively improve agent skills following the Agent Skills specification. Use when asked to "create a skill", "write a skill", "synthesize sources into a skill", "improve a skill from positive/negative examples", "update a skill", or "maintain skill docs and registration". Handles source capture, precision passes, authoring, registration, and validation.

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Use this Skill: https://skilld.dev/gh/getsentry/skills/skill-writer

This session only. Nothing lands on disk.

referencesexample-subagent-fork-skill.md

≈270 tokens on demand. Your agent reads this file only when SKILL.md points to it.

Case Study: Subagent-Fork Skill Synthesis

Scenario

Goal: create a skill that runs a self-contained task in isolated context and returns a concise summary.

Input collection approach

This case collected:

  1. official provider docs for skill execution in forked context
  2. examples of self-contained tasks that benefit from isolation
  3. failure cases where passive guidance was incorrectly put into subagents
  4. summary expectations for returning results to the main thread

Coverage matrix used

Required dimensions tracked during synthesis:

  1. why isolation helps
  2. task prompt clarity
  3. output/summary contract
  4. tool/model assumptions
  5. portability constraints

Synthesized artifacts produced

The resulting skill references included:

  1. actionable task body
  2. expected summary schema
  3. portability note
  4. anti-pattern showing passive guidance that should stay inline

What made this high quality

  1. the skill body was a task, not a convention list
  2. the isolation benefit was concrete
  3. the result expected back in the main thread was explicit

Source: SKILL.md on GitHub

Third-party checks

No alerts17d5 checks · Risk SAFE
  • Gen Agent Trust Hub17d

    The skill is a comprehensive meta-router and workflow guide for creating, updating, and evaluating agent skills. It includes a helper python script for structural validation and standard markdown templates, presenting no security risks.

  • Socket17d

    No alerts

  • Snyk17d

    Risk: LOW · No issues

  • Runlayer7mo

    5/19 files flagged

  • ZeroLeaks5mo

    Score: 93/100 · 2 sections analyzed

Provenance

Signed by skilld at 5a64b36. This ties the file your Agent reads to that commit on GitHub. It does not review the instructions.

Last checked against GitHub yesterday.

Activeupdated 3 months ago

Topics

  • Documentation
  • skill-authoring
  • workflow
  • specification
  • synthesis
  • iteration
  • validation
  • prompt-engineering
  • agent-skills

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README badge for getsentry/skills/skill-writer

What it does

Guides AI agents through a structured workflow for creating, updating, and iterating on agent skills—instruction files that extend AI coding capabilities. Includes reference files for synthesis, authoring, validation, and skill registration following the Agent Skills specification.

Generated from the current SKILL.md.

Frequently asked

Does this skill help me write skills for Claude, or does it help Claude write skills?
This skill is loaded into Claude or another AI coding agent. It provides the agent with a standardized workflow, reference files, and decision trees for creating, updating, and iterating on skills that other agents can use.
What's the difference between create, update, synthesize, and iterate modes?
Create starts from scratch. Update modifies an existing skill. Synthesize gathers and structures source material before authoring. Iterate improves a skill based on positive, negative, or fix examples.
Do I need to read all the reference files?
No. The skill uses a step-by-step workflow that loads only the specific reference files needed for your operation. Start with mode-selection.md to determine your path, then load only the files it directs you to.
Can I use this skill to write skills for other AI providers, or only Claude?
The skill supports both provider-agnostic skills and Claude-specific mechanics. Provider-specific references are optional; the core workflow and execution shapes are portable across agents.
What does a completed skill output look like?
A skill consists of a SKILL.md file (the runtime router), optional focused reference files under references/, a SPEC.md for the maintenance contract, and optional scripts or templates. The skill-writer guides you through all artifact types and decides what belongs in each.

Generated from the current SKILL.md. These answers refresh after source changes.