Metacall

A Model Context Protocol (MCP) server that exposes MetaCall FaaS operations as AI-callable tools, letting LLMs like Claude manage your MetaCall deployments directly.

What this POC does

This server wraps three MetaCall API endpoints as MCP tools:

Tool	Description	Underlying API
list_deployments	Lists all active FaaS deployments on your account	GET /api/deploy/list
call_function	Calls a deployed function by name with arguments	POST /api/call
deploy_from_repo	Deploys a Git repository to MetaCall FaaS	POST /api/repository/add

Prerequisites

• Node.js ≥ 18
• A MetaCall account with an API token

Setup

npm install

Configuration

Export your MetaCall API token as an environment variable before running:

export METACALL_TOKEN=your_token_here

You can find your token in the MetaCall Dashboard under Settings → API Tokens.

Running

npm run start

On success you'll see on stderr:

MetaCall MCP Server running...

The server communicates over stdio, so Claude Desktop connects to it as a subprocess.

Connecting to Claude Desktop

Add the following to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "metacall": {
      "command": "npm",
      "args": ["run", "start"],
      "cwd": "/path/to/metacall-mcp",
      "env": {
        "METACALL_TOKEN": "your_token_here"
      }
    }
  }
}

Restart Claude Desktop and you'll see the MetaCall tools available in the tools panel.

Tool Reference

list_deployments

No parameters. Returns a JSON array of all deployments on your account.

call_function

Parameter	Type	Description
suffix	string	Deployment path/suffix (e.g. "my-app")
name	string	Function name to call
args	array	Arguments to pass to the function

deploy_from_repo

Parameter	Type	Description
url	string	Git repository URL
plan	string?	essential | standard | professional (default: essential)

Building

npm run build
# Output goes to ./dist/