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Skill / Anthropic

Skill Creator for Codex

Create new skills, modify and improve existing skills, and measure skill performance.

Docs reviewedChecked 2026-09-20Runtime not tested

What it adds

Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, edit, or optimize an existing skill, run evals to test a skill, benchmark skill performance with variance analysis, or optimize a skill's description for better triggering accuracy.

developer workflow

Get set up

  1. Preserve the original name. Note the skill's directory name and name frontmatter field -- use them unchanged.
  2. Copy to a writeable location before editing. The installed skill path may be read-only. Copy to /tmp/skill-name/, edit there, and package from the copy.
  3. If packaging manually, stage in /tmp/ first, then copy to the output directory -- direct writes may fail due to permissions.
Read the installation source

Before you install

    Compatibility & limitations

    Documented for ChatGPT desktop app, Codex CLI, Codex IDE extension

    Cursor: Not confirmed for Cursor.

      This listing is based on source documentation. We have not installed or runtime-tested this asset.

      How it fits together

      Systematic Debugging · SkillUse when encountering any bug, test failure, or unexpected behavior, before proposing fixes.Subagent Driven Development · SkillUse when executing implementation plans with independent tasks in the current session.Finishing a Development Branch · SkillUse when implementation is complete, all tests pass, and you need to decide how to integrate the work.Fetch · MCP serverA Model Context Protocol server that provides web content fetching capabilities.Filesystem · MCP serverNode.js server implementing Model Context Protocol (MCP) for filesystem operations.Memory · MCP serverA basic implementation of persistent memory using a local knowledge graph. This lets Claude remember information about the user across chats.

      Sources & provenance

      Reviewed 2026-09-20. Source revision: main (mutable; commit not pinned).