Google Antigravity MCP Config Reference

Before you start

Create an API key on the Agent page in planpo.st and grant only the permissions this agent needs. The key is shown once; replace pk_live_xxx in the snippets below with it. Its posts go out at the time the agent sets; to check each one first, turn on “Require approval before publishing” when you create the key, or later in the key's row on the Agent page.

Local install

Runs the MCP server on your own machine through npx, so your key never leaves it. Needs Node 18 or newer.

Local, in mcp_config.json

{
  "mcpServers": {
    "planpost": {
      "command": "npx",
      "args": ["-y", "planpost-mcp"],
      "env": { "PLANPOST_API_KEY": "${PLANPOST_API_KEY}" }
    }
  }
}

Things that catch people out

Antigravity substitutes ${VAR_NAME} from the environment, so export PLANPOST_API_KEY in your shell rather than pasting the key into the file.
In the IDE you can reach the same file via the agent panel: ... menu -> MCP Servers -> Manage MCP Servers -> View raw config.
Custom servers sit alongside the built-in MCP Store; a server added in the raw config appears with the store-installed ones.

Check it works

Ask the agent to list your connected accounts. If it comes back with them, the tools are available.

Prompt

Which social accounts do I have connected on planpo.st?

Google Antigravity MCP documentation MCP tool reference REST API reference

Other clients

Create an account, then connect Google Antigravity.

Start free Connect your agent

Free plan, no card: 2 accounts, 30 posts a month, your agent included. X needs a paid plan.

Connect Google Antigravity

Before you start

Local install

Things that catch people out

Check it works

Other clients

Create an account, then connect Google Antigravity.

Connect Google Antigravity

Before you start

Local install

Things that catch people out

Check it works

Other clients

Create an account, then connect Google Antigravity.