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mcptoon — MCP Tool-Catalog Compression

A CLI-backed skill that collapses bloated MCP tool schemas into a tiny name index and fetches full schemas only right before a call.

UtilitiesIntermediate★ 419⑂ 25AI score 9/10Last updated: Oct 31, 2026

What it does

  • Replaces raw MCP tool listings with mcptoon manifest, a compact name index (~2.2 tokens/tool; the docs cite 255 tools going from 71,929 → 581 tokens).
  • Fetches the real parameter schema for just one tool via mcptoon inspect <server> <tool>, then executes with mcptoon call (--auto resolves the server, --stdin handles huge JSON payloads).
  • Marks responses that must not be compressed (images/base64) once with mcptoon policy set <server> <tool> raw.
  • Manages the skill catalog too: mcptoon skills list / resolve / sync / add / remove, with a version gate, derived Roo/OpenCode views, and tombstoned removals.
  • Ships explicit safety rules: a real directory where a link belongs is archived rather than deleted, remove moves to a dated archive, and tombstone commits use path-scoped git add only.

Who it's for

  • Anyone running many MCP servers in Claude Code, Cursor, Codex, Cline, or Windsurf whose context window is eaten by tool schemas.
  • Teams that want one source of skills/servers mirrored across multiple agents.
  • People who need measured — not guessed — token-cost reductions.

Examples

  1. "What tools do I have?" → run mcptoon manifest instead of dumping raw listings, then inspect only the tool you'll actually call.
  2. "Call this tool, I don't know which server owns it" → mcptoon call --auto <tool> '{"arg":"value"}'.
  3. "Keep my skills folder identical in Cursor and OpenCode" → mcptoon skills sync --dry to preview, then --derived all to regenerate flat views.

· · · 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/claude-code-plugin/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 AI Skill Mart.
Copy the claude-code-plugin/skills/mcptoon folder from the GitHub repo activeing123/mcptoon into my ~/.claude/skills/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 /tmp/mcptoon && mkdir -p ~/.claude/skills && cp -r /tmp/mcptoon/claude-code-plugin/skills/mcptoon ~/.claude/skills/

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

  1. Confirm Python and pip are available: python -V and pip -V.
  2. Install the CLI: pip install mcptoon (zero-dependency wheel, ~189KB).
  3. Verify the setup: mcptoon doctor.
  4. Easiest path for Claude Code users: run /plugin marketplace add activeing123/mcptoon, which installs the CLI, wires the mcptoon serve bridge, and bundles this skill.
  5. Manual skill install: git clone https://github.com/activeing123/mcptoon, then copy claude-code-plugin/skills/mcptoon into ~/.claude/skills/.
  6. For exact savings numbers, pip install tiktoken and run mcptoon bench; without tiktoken the table is labelled an estimate.
  7. To undo: pip uninstall mcptoon and delete ~/.mcptoon/config.json (plus any project-level ./.mcptoon.json).
View source on GitHub ↗License: Apache-2.0