Clef

Clef MCP Server

Read-only tools that AI assistants such as ChatGPT can call through Clef's MCP endpoint at clefdrills.com/mcp -- finding Clef guides, transposing chord symbols, spelling chords as piano notes, and mapping guitar tab to piano pitches. No Clef account or sign-in is needed (per the Clef privacy policy). An anonymous tools/list on 2026-11-04 returned four tools (find_music_guides, transpose_chords, spell_piano_chord, tab_to_piano_notes). Clef publishes no OpenAPI, AsyncAPI or GraphQL contract.

GitHub

Documentation

📖
Documentation
https://clefdrills.com/privacy/

Other Resources

🔗
LLMsTxt
https://clefdrills.com/llms.txt
🔗
APIsJSON
https://artifacts.apis.io/clefdrills-com/apis.yml

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API 
curl "https://apis.io/api/v1/apis/clefdrills-com:clef-mcp-server"
All apis 
curl "https://apis.io/api/v1/apis?limit=25"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

API entry from apis.yml

apis.yml Raw ↑ 
aid: clefdrills-com:clef-mcp-server
name: Clef MCP Server
description: Read-only tools that AI assistants such as ChatGPT can call through Clef's MCP endpoint at
  clefdrills.com/mcp -- finding Clef guides, transposing chord symbols, spelling chords as piano notes,
  and mapping guitar tab to piano pitches. No Clef account or sign-in is needed (per the Clef privacy
  policy). An anonymous tools/list on 2026-11-04 returned four tools (find_music_guides, transpose_chords,
  spell_piano_chord, tab_to_piano_notes). Clef publishes no OpenAPI, AsyncAPI or GraphQL contract.
humanURL: https://clefdrills.com/privacy/
baseURL: https://clefdrills.com/mcp
tags:
- MCP
- Music Education
tags_raw:
- Model Context Protocol
- Music Education
properties:
- type: Documentation
  url: https://clefdrills.com/privacy/
- type: LLMsTxt
  url: https://clefdrills.com/llms.txt