@date-fns/mcp

date-fns documentation MCP server.

🚧 Work in progress, follow for updates on Twitter or Bluesky

Running

VS Code

To connect the VS Code, add the following lines to your .vscode/mcp.json replacing npx with your package manager command (e.g., pnpm or yarn with the dlx argument):

{
  "servers": {
    "date-fns": {
      "type": "stdio",
      "command": "npx",
      "args": ["@date-fns/mcp"]
    }
  }
}

If you have @date-fns/mcp installed as a dependency, you can use npx date-fns-mcp (or pnpm date-fns-mcp/yarn date-fns-mcp) instead.

Once it's done, the MCP server will be available in the Extensions tab in the Primary Side Bar. Make sure it's started by right-clicking (or using the cog icon) and selecting Start Server in the context menu.

See the VS Code documentation on MCP servers for more details.

Claude Code

To connect the Claude Code, add the following lines to .mcp.json replacing npx with your package manager command (e.g., pnpm or yarn with the dlx argument):

{
  "mcpServers": {
    "date-fns": {
      "command": "npx",
      "args": ["@date-fns/mcp"]
    }
  }
}

If you have @date-fns/mcp installed as a dependency, you can use npx date-fns-mcp (or pnpm date-fns-mcp/yarn date-fns-mcp) instead.

Alternatively, you can use CLI to add it to the user scope:

claude mcp add date-fns --scope user npx @date-fns/mcp

Claude Desktop

To connect the Claude Desktop, add the following lines to the configuration file (~/Library/Application Support/Claude/claude_desktop_config.json on macOS or %APPDATA%\Claude\claude_desktop_config.json on Windows), replacing npx with your package manager command (e.g., pnpx or yarn with dlx argument):

{
  "mcpServers": {
    "date-fns": {
      "command": "npx",
      "args": ["@date-fns/mcp"]
    }
  }
}

Make sure to restart the app, to apply the changes. You can verify it is connected by going into Settings > Connectors. It should list date-fns as a local dev connector.

See the Claude documentation on MCP servers for more details.

Dev Container

When running the project in a dev container, you can use docker to run the stdio server.

First, get the container name:

docker ps --format "table {{.Names}}\t{{.Image}}"

It would print a table looking like this:

NAMES        IMAGE
eager_wing   vsc-date-fns-edf43f8ea15ab083575b80286e19288104a196412032ae9caa7e1f2ad451d6be-uid

Grab the container name, then to verify if everything is set up, run the command, replacing eager_wing with your container name and /wrkspc/date-fns-mcp with the path to the MCP repo:

docker exec -it eager_wing bash -lc 'cd /wrkspc/date-fns-mcp && eval "$(mise activate bash --shims)" && node ./src/bin.ts'

You should see ⭐️ date-fns MCP Server running on stdio.

If you run the main date-fns repo dev container, the path could be /wrkspc/date-fns/submodules/mcp (depending on the repo directory name where you have it cloned):

docker exec -it eager_wing bash -lc 'cd /wrkspc/date-fns/submodules/mcp && eval "$(mise activate bash --shims)" && node ./src/bin.ts'

Connecting to Claude Desktop

To connect the Claude Desktop to the MCP running in a dev container, adjust your configuration, replacing the name (i.e., eager_wing) and the path to the repo (i.e., /wrkspc/date-fns-mcp):

{
  "globalShortcut": "Alt+Ctrl+Space",
  "mcpServers": {
    "date-fns": {
      "command": "docker",
      "args": [
        "exec",
        "-i",
        "eager_wing",
        "bash",
        "-lc",
        "cd /wrkspc/date-fns-mcp && eval \"$(mise activate bash --shims)\" && node ./src/bin.ts"
      ]
    }
  }
}

License

MIT © Sasha Koss