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LLMGRAPH for Antigravity

Add the LLMGRAPH MCP server to Antigravity on Windows: the config file, the cmd /c npx form, and how to check it connected.

On this page1 · Add the server to Antigravity 2 · Check that it connected 3 · Sign in once 4 · Make sure Antigravity uses it 5 · The five questions Other agents

Add LLMGRAPH to Google Antigravity with one command or one entry in .agents/mcp_config.json; on Windows, start the server as cmd /c npx -y llmgraph-mcp. Antigravity is tested by us: we ran it against the server, and an independent tester ran it on a separate Windows 11 machine.

1Add the server to Antigravity

Add tested by us .agents/mcp_config.json (workspace) or ~/.gemini/config/mcp_config.json (global)

$agy mcp add llmgraph -- npx -y llmgraph-mcp

Or as a file entry:

json

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

agy mcp add writes the global configuration. The IDE and App use the same file format.

On Windows, start the server as cmd /c npx -y llmgraph-mcp. An independent tester found that this finds npx.cmd reliably.

2Check that it connected

Check tested by us (your agent lists them as tools)

Antigravity CLI: type /mcp in the prompt panel and press Enter to open the MCP manager (status rings for active, disconnected, loading servers).
agy mcp list prints NAME, TYPE, STATUS, COMMAND/URL for the configured servers.

The first time your agent asks a question, LLMGRAPH answers with a sign-in link and a 6-character code. In a terminal you can run this instead:

$npx -y llmgraph-mcp login

The link works for 10 minutes. Open the full link, including everything after the #, sign in with Google, compare the code on the page with the one your agent shows, and approve this device. Approving your first device starts your 7-day trial. The full steps are in Set up with your agent.

4Make sure Antigravity uses it

Adding a server doesn't make an agent use it.

Add a line to your agent's instructions file, AGENTS.md (GEMINI.md is also read):

AGENTS.md

Before changing code, ask the llmgraph MCP tools who_calls and what_breaks_if_changed; after editing, run check_my_changes; read each answer's label and its lines about what it cannot see.

We can't promise that an agent asks on its own. Every answer starts with llmgraph · : look for it where Google Antigravity shows what it asked.

5The five questions

Question	What it answers
who_calls	Every place that calls this function, plus calls we can't see.
what_breaks_if_changed	Everything that depends on this, directly or indirectly, and what we can't see.
check_my_changes	After editing: callers you didn't update, and anything we can't see.
what_is_unknown	Where our view is blind (dynamic calls, unknown types, unreadable files) and why.
explain	Why we said this: the evidence behind one answer line.

Other agents

LLMGRAPH for Claude Code: MCP setup on Windows.
LLMGRAPH for Cursor: MCP setup on Windows.
LLMGRAPH for Codex: MCP setup on Windows.
LLMGRAPH for Gemini CLI: MCP setup on Windows.
LLMGRAPH for OpenCode: MCP setup on Windows.
LLMGRAPH for Windsurf: MCP setup on Windows.

Set up with your agentEvery agent on one page, plus the sign-in steps and what to do when something goes wrong.The MCP serverWhat the server answers and what it needs.Questions and answersShort answers to common questions.

For agentsthis page as Markdown/docs/agents/antigravity.mdllms.txt