A command-line tool and bridge for discovering and calling Model Context Protocol servers. It combines servers behind one standard input/output connection and can show compact tool lists and compressed results.

Use it to list available tools, inspect a tool's schema, call a tool by name, or connect several configured servers to an MCP client.

It reduces the setup needed when an agent uses multiple tool servers and can limit how much tool schema and output enters the agent's context. The input does not describe other kinds of automation.

mcptoon — Plugin for Gemini CLI by activeing123

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/activeing123/mcptoon

Made for: Gemini CLI.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/activeing123/mcptoon/gemini-extension/github.svg)](https://agentmods.dev/plugins/activeing123/mcptoon/gemini-extension)

Your own site

<a href="https://agentmods.dev/plugins/activeing123/mcptoon/gemini-extension"><img src="https://agentmods.dev/badge/plugins/activeing123/mcptoon/gemini-extension/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/plugins/activeing123/mcptoon/gemini-extension"><img src="https://agentmods.dev/badge/plugins/activeing123/mcptoon/gemini-extension.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

mcptoon scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

The scan reads gemini-extension.json. This mod also ships 5 executable files (scripts/bench_skills.py, scripts/bench_tokens.py, scripts/check_zero_deps.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

gemini-extension.json · 13 lines

What it actually says

{
  "name": "mcptoon",
  "version": "0.7.19",
  "description": "Zero-dependency CLI to discover and call MCP servers with compact manifests and TOON-compressed results; doubles as a single stdio bridge.",
  "contextFileName": "GEMINI.md",
  "mcpServers": {
    "mcptoon": {
      "command": "mcptoon",
      "args": ["serve"]
    }
  }
}

Files

What ships with it

33 files beside gemini-extension.json in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

yesterday Changed e920731e3865
2d ago Changed 14b7177e57fe
5d ago Changed 6462193e4bae
7d ago First seen · 13 lines scan A 2e09f6eb209e

Subscribe to this mod's changes

mcptoon is a plugin published in the GitHub repository activeing123/mcptoon (202 stars, last pushed yesterday), licensed Apache-2.0. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-13.

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mcptoon