Metatool App is a GUI app to manage MCP tools using MCP (Model Context Protocol). It has to be used with mcp-server-metatool together. mcp-server-metatool is a proxy MCP server that joins MCP servers configured in this Metatool App GUI. It supports routing list_tools and call_tool in MCP.

The app is prioritized to be self hostable at first, and it is completely free and open source.

sequenceDiagram
    participant MCPClient as MCP Client (e.g. Claude Desktop)
    participant MetaToolMCP as MetaTool MCP Server
    participant MetaToolApp as MetaTool App
    participant MCPServers as Installed MCP Servers in Metatool App

    MCPClient ->> MetaToolMCP: Request list tools
    MetaToolMCP ->> MetaToolApp: Get tools configuration & status
    MetaToolApp ->> MetaToolMCP: Return tools configuration & status

    loop For each listed MCP Server
        MetaToolMCP ->> MCPServers: Request list_tools
        MCPServers ->> MetaToolMCP: Return list of tools
    end

    MetaToolMCP ->> MetaToolMCP: Aggregate tool lists
    MetaToolMCP ->> MCPClient: Return aggregated list of tools

    MCPClient ->> MetaToolMCP: Call tool
    MetaToolMCP ->> MCPServers: call_tool to target MCP Server
    MCPServers ->> MetaToolMCP: Return tool response
    MetaToolMCP ->> MCPClient: Return tool response

• You only need to install one mcp-server-metatool MCP server and metatool will handle the rest for you.
• GUI Metatool App, easy to use, add/remove/toggle on-offs mcp servers easily.
• Free, open source, self hostable.
• Project allows you to use Metatool in multiple MCP clients.
• Profile allows you to switch tool combinations on a single MCP client without pain.

To get started with Metatool App, the eastiest way is to clone the repository and use Docker Compose to run it.

git clone https://github.com/metatool-ai/metatool-app.git
cd metatool-app
cp example.env .env
docker compose up --build -d

Then open http://localhost:12005 in your browser to open Metatool App.

It is recommended to have npx (node.js based mcp) and uvx (python based mcp) installed globally. To install uv check: https://docs.astral.sh/uv/getting-started/installation/

You also need a MCP Client to connect to mcp-server-metatool. For example if you are using Claude Desktop, the config json may look like this:

{
  "mcpServers": {
    "metatool": {
      "command": "uvx",
      "args": ["mcp-server-metatool"],
      "env": {
        "METATOOL_API_KEY": "<your api key>"
      }
    }
  }
}

Optionally you can also set the url to Metatool App server:

{
  "mcpServers": {
    "metatool": {
      "command": "uvx",
      "args": ["mcp-server-metatool"],
      "env": {
        "METATOOL_API_KEY": "<your api key>",
        "METATOOL_API_BASE_URL": "http://localhost:12005"
      }
    }
  }
}

You can get the API key from the Metatool App's API Keys page.

• MCP Server Metatool: you only need to configure once to connect to mcp-server-metatool, then you can manage tools in Metatool App forever. mcp-server-metatool is a proxy MCP server that itself is a MCP Client that connects to and joins MCP servers tools configured in this Metatool App GUI. For details check out mcp-server-metatool repo.
• GUI Metatool App: use GUI to manage MCP servers integrations: the servers and tools can be dynamically added or removed on the go through GUI.
• Projects and API Keys: at project level you can create API Keys for connection and auth. Project level enables usages across MCP Clients. E.g. you can have default project to use with Claude Desktop and another project to use with another MCP Client.
• Profiles layer under projects: each project can have multiple profiles, each profile can have different tools and configurations. And you can activate a profile for a project and have exactly one profile active at a time. You can easily switch between profiles using the GUI and don't need to worry about reconfiguring your MCP Client connections to MCP servers.
• Tools Management: under profile level you can also toggle on-offs of mcp servers you added.
• Tool level of MCP servers toggle on-offs are TBA.

Elastic License 2.0 (ELv2)

• Demo video uses MCP Client 5ire