A coding-agent add-on for building and operating GNS3 network labs. GNS3 is software that simulates networks of routers, switches, firewalls and virtual machines.

Use it to create projects and devices, set hardware settings, connect network nodes, run console or SSH commands, document labs, and export topology diagrams.

It removes the need to set up lab projects, connect devices and troubleshoot them manually through the GNS3 interface. It also provides access to device consoles and SSH connections.

gns3-lab — Plugin for Claude Code by ChistokhinSV/gns3-mcp

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/ChistokhinSV/gns3-mcp

Made for: Claude Code.

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/chistokhinsv/gns3-mcp/plugin/github.svg)](https://agentmods.dev/plugins/chistokhinsv/gns3-mcp/plugin)

Your own site

<a href="https://agentmods.dev/plugins/chistokhinsv/gns3-mcp/plugin"><img src="https://agentmods.dev/badge/plugins/chistokhinsv/gns3-mcp/plugin/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/chistokhinsv/gns3-mcp/plugin"><img src="https://agentmods.dev/badge/plugins/chistokhinsv/gns3-mcp/plugin.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 The manifest loads nothing itself; its 1 skill, 1 MCP server cost 98 tokens a session between them.

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

gns3-lab 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 3d ago.

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.

plugin/.claude-plugin/plugin.json · 50 lines

What it actually says

{
  "name": "gns3-lab",
  "displayName": "GNS3 Lab",
  "version": "0.56.5",
  "description": "Build, wire, configure and troubleshoot GNS3 network labs: projects, nodes (RAM, CPUs, QEMU disks, CD-ROM, options), links, device consoles, SSH, drawings and topology export. Bundles the gns3-mcp server (runs locally with uvx) and a skill with the workflows.",
  "author": {
    "name": "Sergei Chistokhin",
    "url": "https://github.com/ChistokhinSV"
  },
  "homepage": "https://github.com/ChistokhinSV/gns3-mcp",
  "repository": "https://github.com/ChistokhinSV/gns3-mcp",
  "license": "MIT",
  "icon": "./assets/icon.png",
  "keywords": [
    "gns3",
    "network",
    "lab",
    "automation",
    "mcp",
    "netmiko"
  ],
  "userConfig": {
    "gns3_host": {
      "type": "string",
      "title": "GNS3 server host",
      "description": "Hostname or IP of the GNS3 server. Leave empty to use GNS3_HOST from the environment or ~/.gns3-mcp/.env (default localhost).",
      "default": ""
    },
    "gns3_port": {
      "type": "string",
      "title": "GNS3 server port",
      "description": "GNS3 API port. Leave empty for GNS3_PORT from the environment or ~/.gns3-mcp/.env (default 80).",
      "default": ""
    },
    "gns3_user": {
      "type": "string",
      "title": "GNS3 username",
      "description": "Leave empty for GNS3_USER from the environment or ~/.gns3-mcp/.env (default admin).",
      "default": ""
    },
    "gns3_password": {
      "type": "string",
      "title": "GNS3 password",
      "description": "Stored in the system credential store. Leave empty to use GNS3_PASSWORD from the environment or ~/.gns3-mcp/.env.",
      "sensitive": true,
      "default": ""
    }
  }
}

Contents

What it installs

The manifest is a name and a version. 1 skill, 1 MCP server travel with it, and installing the plugin installs all of them — 98 tokens a session between them. Each is measured on its own page, and each can be installed alone.

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.

3d ago Changed 937b45841f6d
4d ago First seen · 50 lines scan A 6d07aa084675

Subscribe to this mod's changes

gns3-lab is a plugin published in the GitHub repository ChistokhinSV/gns3-mcp (16 stars, last pushed 3d ago), licensed MIT. 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 2026-11-03.

DevOps and cloud gns3 gns3-api gns3-appliance mcp mcp-server

gns3-lab next to 6 plugins from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
gns3-labChistokhinSV/gns3-mcp	Plugin	16	3d ago	MIT	A	—	Claude Code
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kadamkadam-official/mcp-server	Plugin	0	10d ago	MIT	A	—	Cursor
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