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MCP Composer MCP Server

local only

MCP Composer runs on your own machine — the client starts it, so there is no endpoint to ping. Last commit 22 Jul 2026.

Aggregate multiple MCP backends behind a single stdio endpoint with namespaced routing.

Installs / week
npm · @oaslananka/composer
2
Stars
2 open issues
22 Jul 2026
Last commit
0 releases in 90 days
Apache-2.0
License
TypeScript

What the code does

We read the source, 20 h ago · rules 3dff92dd89df

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.

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.

Three servers free · no card

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 composer -- npx -y @oaslananka/composer
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "composer": {
      "args": [
        "-y",
        "@oaslananka/composer"
      ],
      "command": "npx"
    }
  }
}
~/.codex/config.toml
[mcp_servers.composer]
command = "npx"
args = ["-y", "@oaslananka/composer"]
.cursor/mcp.json
{
  "mcpServers": {
    "composer": {
      "args": [
        "-y",
        "@oaslananka/composer"
      ],
      "command": "npx"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "composer": {
      "args": [
        "-y",
        "@oaslananka/composer"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: COMPOSER_CONFIG (Path to the composer.yml backend definition file.). The author declared them in the registry entry; get the values from the project itself.

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MCP Composer — questions

Answers built from our own checks of this server.

Why is there no uptime for MCP Composer?
MCP Composer 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 @oaslananka/composer.
How do I connect MCP Composer?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It runs locally, so the command pulls @oaslananka/composer straight from npm; nothing to host, nothing to sign up for.
Is MCP Composer open source?
Yes — it is published under the Apache-2.0 licence, written in TypeScript, 2 stars on GitHub and 2 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.