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How to install What Devtools MCP in Antigravity CLI

To install What Devtools MCP in Antigravity CLI, add the "what-devtools-mcp" block to the mcpServers section of ~/.gemini/config/mcp_config.json (remote servers use "serverUrl"), then start agy.

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1. 1

   Open the MCP config

   Create or open ~/.gemini/config/mcp_config.json for every project, or .agents/mcp_config.json for this project only.

2. 2

   Add the server

   Paste this. If the file already has servers, add the "what-devtools-mcp" entry inside the existing mcpServers block.

   {
     "mcpServers": {
       "what-devtools-mcp": {
         "command": "npx",
         "args": [
           "-y",
           "what-devtools-mcp"
         ]
       }
     }
   }

   Copy
3. 3

   Start Antigravity CLI

   Run agy. The server and its tools load when the session starts.

Config file: ~/.gemini/config/mcp_config.json (all projects) or .agents/mcp_config.json (this project)

MCP servers run with your permissions. If What Devtools MCP needs an API key, add it under env in the config. Check its README.

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