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DirectorySkillsMCP Builder
Skill / Anthropic

MCP Builder Codex Skill

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools.

Docs reviewedChecked 2026-09-20Runtime not tested

What it adds

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).

developer workflow

Get set up

  1. Copy the skill folder from the source into your Codex skills directory.
  2. Start a new thread so Codex picks up the skill.
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).