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.
We read the source, 22 h ago · rules 995398eba69f
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.
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.
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.
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.
claude mcp add comfy-ui-builder -- npx -y mcp-comfy-ui-builder
{
"mcpServers": {
"comfy-ui-builder": {
"command": "npx",
"args": [
"-y",
"mcp-comfy-ui-builder"
]
}
}
}
[mcp_servers.comfy-ui-builder]
command = "npx"
args = ["-y", "mcp-comfy-ui-builder"]
{
"mcpServers": {
"comfy-ui-builder": {
"command": "npx",
"args": [
"-y",
"mcp-comfy-ui-builder"
]
}
}
}
{
"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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