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Antigravity by Google.

Antigravity MCP documentation

Interaction

My interaction history:

  1. tell me about the planexe mcp tool
  2. make 5 suggestions
  3. crisis response plan for yellow stone outbreak, please refine that
  4. I didn't meant outbreak, I meant vulcanic
  5. your prompt is a bit shorter than the example prompts
  6. go ahead create the plan
  7. stop that plan you are creating.
  8. now create the plan again, this time with ALL details. Last time you had FAST selected that would leave out most details.
  9. check status
  10. status
  11. status
  12. status
  13. download the report
  14. summarize the report
  15. does it correspond to your expectations?

I had to manually ask about check status to get details how the plan creation was going. It's not something that Antigravity can do.

The created plan is here: Yellowstone Evacuation

Prerequisites

A working installation of PlanExe.

  • The recommended way is to install PlanExe by following the Getting Started instructions. Make sure that docker compose up is running, in order to connect to PlanExe.
  • Alternatively: Run PlanExe on another server and port.
  • Alternatively: If you are a developer run PlanExe inside a python virtual environment.

Double check that PlanExe can take a prompt and create a plan. Since it doesn't make sense to start configuring Antigravity if the PlanExe installation is incomplete.

Configuring Antigravity

To configure Antigravity to use PlanExe, you need to add the MCP server configuration.

  1. Open Antigravity
  2. Click the "..." icon at the top of the Agent panel
  3. Select "MCP Servers"
  4. This opens the mcp_config.json file.

Add the following planexe dictionary to your mcpServers configuration:

{
  "mcpServers": {
    "planexe": {
      "command": "uv",
      "args": [
        "run",
        "--with",
        "mcp",
        "/path/to/PlanExe/mcp_local/planexe_mcp_local.py"
      ],
      "env": {
        "PLANEXE_URL": "http://localhost:8001/mcp",
        "PLANEXE_PATH": "/Users/your-name/Desktop"
      }
    }
  }
}

Make these adjustments to the planexe snippet:

  • Make adjustments to /path/to/PlanExe so it points to where PlanExe is located on your computer.
  • Make adjustments to /Users/your-name/Desktop so it points to the directory where PlanExe is allowed to write to, so the plan can be downloaded.
  • Optional: Make adjustments to http://localhost:8001/mcp if you have PlanExe running on another port.

Once you have saved the mcp_config.json. Then go to the Manage MCP Servers and click the refresh icon.

If it doesn't work then ask on the PlanExe Discord for help.

This is what it should look like: antigravity MCP settings