dev-gas-extension

Description

Introducing "dev-gas-extension," a Gemini CLI extension designed to supercharge your Google Apps Script (GAS) development. This tool streamlines your entire workflow by integrating GAS with VSCode. It allows you to generate, test, and deploy scripts using natural language prompts within a unified environment. A key feature is the "fake sandbox," which provides a secure local environment for safely testing AI-generated code before deployment. With custom commands to automate tasks like creating, cloning, and updating projects, this extension significantly enhances efficiency and productivity for GAS developers.

How to install dev-gas-extension

1. Install Gemini CLI

First, install the Gemini CLI using npm:

npm install -g @google/gemini-cli

Next, you will need to authorize the CLI. Follow the instructions provided in the official documentation.

2. Install Clasp

Install Clasp, the command-line tool for Google Apps Script:

npm install -g @google/clasp

Authorize Clasp by following the instructions on the official GitHub repository.

Clasp can now be used as an MCP server. While you can configure it directly in your settings.json, the Gemini CLI Extension in this guide will handle this for you.

3. Install gas-fakes

The gas-fakes package is required for local testing and should be installed in your working directory.

1. Create a working directory

makedir sample
cd sample

In this article, this working directory is used.

2. Install gas-fakes

npm install @mcpher/gas-fakes

3. Authorization

You can see how to authorize at https://github.com/brucemcpherson/gas-fakes/blob/main/GETTING_STARTED.md.

4. Install dev-gas-extension

Install the Gemini CLI extension for GAS development:

gemini extensions install https://github.com/tanaikech/dev-gas-extension

For managing Google Workspace as well, you can install the ToolsForMCPServer-extension.

5. Testing the Installation

This extension can be used both on the terminal with and without VSCode.

1. Launch Gemini CLI

Launch the Gemini CLI from the VSCode terminal:

gemini

2. Verify the installed MCP servers with the following command in the Gemini CLI:

/mcp

When dev-gas-extension could be correctly installed, the following response can be seen.

Configured MCP servers:

🟢 gas-fakes-mcp (from dev-gas-extension) - Ready (1 tool)
  Tools:
  - run_gas_with_gas-fakes

🟢 clasp (from dev-gas-extension) - Ready (5 tools)
  Tools:
  - clone_project
  - create_project
  - list_projects
  - pull_files
  - push_files

🟢 workspace-developer (from dev-gas-extension) - Ready (2 tools)
  Tools:
  - fetch_workspace_docs
  - search_workspace_docs

The workspace-developer tool is from the Use Large Language Models (LLMs) to develop on Google Workspace guide.

Sample prompts

The sample prompts using the tools of this MCP server are as follows.

• Streamlining Google Apps Script Development with Gemini CLI Extensions and VSCode

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Licence

MIT

Author

Tanaike

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Update History

• v1.0.0 (October 21, 2025)

  1. Initial release.

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