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mcptoon — MCP tool-catalog compression

A CLI-backed skill that replaces bloated MCP tool schemas with a tiny name index (~99% fewer tokens) and manages one skill catalog across every agent.

Dev & CodingIntermediate★ 202⑂ 8AI score 9/10Last updated: Sep 20, 2026

What it does

  • Turns a huge MCP tool catalog into a compact name index via mcptoon manifest (docs cite 255 tools: 71,929 → 581 tokens), then fetches only the one schema you need with mcptoon inspect before calling with mcptoon call / call --auto.
  • Lets you mark tools whose output must never be compressed (images, base64) with mcptoon policy set <server> <tool> raw.
  • Manages a skill catalog with mcptoon skills: list, offline resolve for task→skill matching, sync one source into every agent's skill folder (links by default), --version-gate, derived Roo/OpenCode flat views, and remove --tombstone.
  • Measures real savings on your machine with mcptoon bench and diagnoses config with mcptoon doctor.

Who it's for

  • Anyone running several MCP servers whose tool schemas eat the context window.
  • People juggling Claude Code, Cursor, Codex, Cline and Windsurf who want identical servers and skills everywhere.
  • Teams migrating off a home-grown skill sync script without a hard cutover.

Examples

  1. "What tools do I have?" → the agent runs mcptoon manifest instead of dumping raw listings, then mcptoon inspect github create_issue right before the call.
  2. After editing a skill, preview with mcptoon skills sync --dry, then sync for real with --version-gate so an un-bumped version is blocked with a reason.
  3. Reporting token savings: run mcptoon bench --json and quote the printed numbers (labelled an estimate unless tiktoken is installed).

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/activeing123/mcptoon/HEAD/skills/mcptoon/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the skills/mcptoon folder from the GitHub repo activeing123/mcptoon into my ~/.claude/skills/activeing123-mcptoon/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

pip install mcptoon && git clone https://github.com/activeing123/mcptoon.git /tmp/mcptoon && mkdir -p ~/.claude/skills && cp -r /tmp/mcptoon/skills/mcptoon ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Check Python is available: run python -V in a terminal.
  2. Install the CLI: pip install mcptoon (189KB, zero dependencies).
  3. Verify it works: run mcptoon doctor.
  4. Claude Code users can do it in one step instead: run /plugin marketplace add activeing123/mcptoon inside Claude Code (installs the CLI, wires the mcptoon serve bridge, and bundles this skill).
  5. To install the skill manually: git clone https://github.com/activeing123/mcptoon.git, then cp -r mcptoon/skills/mcptoon ~/.claude/skills/.
  6. Restart Claude Code and try a trigger phrase like "my MCP tool list is too large".
  7. Before your first skills sync, point MCPTOON_SKILLS_VIEWS at a sandbox and use --dry.
  8. To uninstall: pip uninstall mcptoon, then delete ~/.mcptoon/config.json (and any project-level ./.mcptoon.json).
View source on GitHub ↗License: Apache-2.0