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MCPApp MCP Server

@tanaikech

Basic information

Category

Other

License

MIT license

Transports

stdio

Author

tanaikech

About MCPApp MCP Server

This text introduces the Model Context Protocol (MCP) for AI interaction, exploring Google Apps Script (GAS) as a server option. It shows feasibility with a sample but notes the lack of a GAS SDK, aiming to encourage understanding and development.

#mcp#google-apps-script#model-context-protocol

MCPApp MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "gas_web_apps": {
      "command": "npx",
      "args": [
        "mcp-remote",
        "https://script.google.com/macros/s/###/exec?accessKey=sample"
      ],
      "env": {}
    }
  }
}

MCPApp MCP Server tools

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Fetch the live tool list by running this server in a temporary sandbox using the button above.

Overview

What is MCPApp?

MCPApp is a Google Apps Script library that implements a Model Context Protocol (MCP) server, allowing AI applications to securely access and leverage data from Google Workspace services (Drive, Calendar, Sheets, etc.) through a standardized protocol.

How to use MCPApp?

Create a standalone or container-bound Google Apps Script project, install the MCPApp library using its project key (1TlX_L9COAriBlAYvrMLiRFQ5WVf1n0jChB6zHamq2TNwuSbVlI5sBUzh), then write a doPost function that calls new MCPApp.mcpApp({ accessKey: "sample" }).server(object) with a custom server response and function definitions. The sample shows how to implement tools, resources, and prompts.

Key features of MCPApp

  • Provides a GAS library to deploy MCP servers easily.
  • Supports MCP tools, resources, and prompts.
  • Enables AI to access Google Drive and Google Calendar data.
  • Includes sample functions for file search and calendar schedule retrieval.
  • Uses JSON-RPC 2.0 for client-server communication.

Use cases of MCPApp

  • Build an MCP server that queries Google Drive files and returns metadata to an AI assistant.
  • Let an AI retrieve today’s schedule from Google Calendar via a MCP resource.
  • Create custom prompts that combine Google Workspace data for AI‑powered workflows.
  • Enable internal AI tools to interact with Google Workspace without exposing raw APIs.
  • Serve as a reference implementation for developing a dedicated GAS MCP SDK.

Frequently asked questions

1

How do I install the MCPApp library?

Add the library to your Google Apps Script project using the project key `1TlX_L9COAriBlAYvrMLiRFQ5WVf1n0jChB6zHamq2TNwuSbVlI5sBUzh`. You can also copy and paste the library script directly.

2

What MCP features are implemented in the sample?

The sample implements `tools/list`, `tools/call`, `resources/list`, `resources/read`, `prompts/list`, and `prompts/get` capabilities.

3

Can I use MCPApp with container‑bound GAS projects?

Yes, both standalone and container‑bound script types are supported.

4

What runtime or dependencies are required?

MCPApp runs within Google Apps Script; no additional runtime or external dependencies are needed beyond the standard GAS services.

5

How are transport and authentication handled?

The server is exposed via a Google Web App (deployed as `doPost`). Authentication is handled by an `accessKey` passed to the `mcpApp` constructor; the sample uses `"sample"`.

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