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ComfyUI Builder MCP Server

local only

ComfyUI Builder runs on your own machine — the client starts it, so there is no endpoint to ping. 155 installs a week from npm. Last commit 24 Oct 2026.

ComfyUI MCP server: knowledge base, workflow builder, real-time execution, models, plugins.

Installs per day peak 45 · avg 13 · +67% w/w
a month agotoday
155
Installs / week
npm · mcp-comfy-ui-builder
5
Stars
0 open issues
24 Oct 2026
Last commit
1 release in 90 days
MIT
License
TypeScript

What the code does

We read the source, 22 h ago · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Runs an external command src/manager-cli.ts:60
      const out = execSync(`netstat -ano | findstr :${port}`, { encoding: 'utf8', stdio: ['pipe', 'pipe', 'pipe'] });

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

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Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add comfy-ui-builder -- npx -y mcp-comfy-ui-builder
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "comfy-ui-builder": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-comfy-ui-builder"
      ]
    }
  }
}
~/.codex/config.toml
[mcp_servers.comfy-ui-builder]
command = "npx"
args = ["-y", "mcp-comfy-ui-builder"]
.cursor/mcp.json
{
  "mcpServers": {
    "comfy-ui-builder": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-comfy-ui-builder"
      ]
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "comfy-ui-builder": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mcp-comfy-ui-builder"
      ]
    }
  }
}

Optional settings from the registry entry, left out of the block above: COMFYUI_HOST (ComfyUI API URL (e.g. http://127.0.0.1:8188). Required for execution, queue, outputs), COMFYUI_PATH (Path to ComfyUI install. Required for install_custom_node, install_model), COMFYUI_KNOWLEDGE_DIR (Path to knowledge directory (default: package knowledge/). Use when MCP runs from different cwd).

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ComfyUI Builder — questions

Answers built from our own checks of this server.

Why is there no uptime for ComfyUI Builder?
ComfyUI Builder runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package mcp-comfy-ui-builder was installed 155 times last week.
How do I connect ComfyUI Builder?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls mcp-comfy-ui-builder straight from npm; nothing to host, nothing to sign up for.
How many people use ComfyUI Builder?
The npm package mcp-comfy-ui-builder was installed 155 times in the last week. Week over week that is +67%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is ComfyUI Builder open source?
Yes — it is published under the MIT licence, written in TypeScript and 5 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.