MCP Directory

Magg

Meta-MCP server that manages, aggregates, and proxies other MCP servers so LLMs can extend themselves.

Unverified
stdio (local)
No auth
Stale
Python
View repo 134 Website

Add to your client

Copy the config for your MCP client and paste it into its config file.

Install / run
uv tool install magg

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "magg": {
      "command": "magg",
      "args": [
        "serve"
      ]
    }
  }
}

Step-by-step guides: Add to Claude Desktop · Add to Cursor · Add to Windsurf

Before you start

  • Python 3.12 or higher (3.13+ recommended)
  • uv (recommended) — installed from astral.sh/uv
  • Optional: Docker, for running the pre-built ghcr.io/sitbon/magg images

About Magg

Magg ("The MCP Aggregator") is a Model Context Protocol server that manages, aggregates, and proxies other MCP servers, enabling LLMs to dynamically extend their own capabilities. It can search for and add new MCP servers without human intervention, automatically expose their tools under configurable prefixes, reload configuration without restarting, and bundle servers into reusable "kits." Magg runs in stdio mode (for Claude Desktop, Cline, Cursor, Claude Code), HTTP mode for system-wide access, or a hybrid of both, and ships with the mbro MCP Browser CLI for interactive exploration.

Tools & capabilities (16)

magg_list_servers

List all configured MCP servers.

magg_add_server

Add a new MCP server.

magg_remove_server

Remove a server.

magg_enable_server

Enable a server, making it available.

magg_disable_server

Disable a server, toggling off its availability.

magg_search_servers

Search for MCP servers online.

magg_list_tools

List all available tools from all servers.

magg_smart_configure

Intelligently configure a server from just a URL.

magg_analyze_servers

Analyze configured servers and suggest improvements.

magg_status

Get server and tool statistics.

magg_check

Health-check servers with repair actions (report/remount/unmount/disable).

magg_reload_config

Reload configuration from disk and apply changes.

magg_load_kit

Load a kit and its servers into the configuration.

magg_unload_kit

Unload a kit and optionally its servers from the configuration.

magg_list_kits

List all available kits with their status.

magg_kit_info

Get detailed information about a specific kit.

When to use it

  • Let an LLM self-service its own toolset — search for, add, and configure new MCP servers at runtime without human intervention.
  • Aggregate tools from many MCP servers behind a single endpoint, namespaced with configurable prefixes.
  • Bundle related MCP servers into reusable 'kits' that can be loaded or unloaded as a group.
  • Provide a single authenticated HTTP MCP gateway (with JWT bearer tokens) for system-wide or team access to multiple backend servers.
  • Inspect and manage MCP setups interactively with the bundled mbro CLI, including scriptable automation.

Security notes

HTTP transport supports optional bearer-token authentication via an RSA keypair. Run `magg auth init` to generate keys (stored in `~/.ssh/magg/` by default), then `magg auth token` to mint JWTs; clients pass the token via the MAGG_JWT env var or BearerAuth. The private key may also be supplied through MAGG_PRIVATE_KEY. By default (stdio quick-start) no auth is configured. A read-only mode is available via MAGG_READ_ONLY=true. Because Magg can dynamically add and run arbitrary backend MCP servers at an LLM's request, treat it as capable of executing whatever those servers can do.

Magg FAQ

What transports does Magg support?

stdio (default, for Claude Desktop, Cline, Cursor, Claude Code), HTTP (`magg serve --http`), and a hybrid mode that runs both simultaneously, plus in-memory transport.

How do I add it to Claude Code?

After installing Magg (`uv tool install magg`), run `claude mcp add magg -- magg serve --hybrid --port 42000`. For a plain stdio client, point it at the command `magg` with argument `serve`.

Does it require authentication?

No by default. For HTTP access you can optionally enable RSA-based JWT bearer-token auth via `magg auth init` / `magg auth token`; clients then pass the token through the MAGG_JWT environment variable or BearerAuth.

Where is configuration stored?

In `.magg/config.json` in the current working directory, allowing project-specific tool configurations. Magg supports automatic config reloading (file watching, SIGHUP, or the `magg_reload_config` tool).

#aggregator#proxy#meta-mcp#mcp#fastmcp#python#docker#llm#tool-management

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