Antigravity Bridge

A TypeScript-based Model Context Protocol (MCP) server template wired into the Antigravity agentic environment. It exposes tools over a stdio transport and ships with a ready-to-import SQLite skill for local database access.

---

Prerequisites

Requirement	Version
Node.js	≥ 18
npm	≥ 9
Antigravity	latest

---

Project Structure

antigravity-mcp-bridge/
├── src/
│   └── server.ts          # MCP server — stdio transport + tools
├── skills/
│   └── sqlite_skill.json  # Antigravity Global Skill definition
├── dist/                  # Compiled JS output (after build)
├── auto_bridge.sh         # Detects MCP configs & writes env settings
├── tsconfig.json
├── package.json
└── README.md

---

1 · Starting the MCP Server

Build & run (recommended)

# Install dependencies (first time only)
npm install

# Compile TypeScript → dist/
npm run build

# Start the server
node dist/server.js

The server writes a startup message to stderr and listens for MCP messages on stdin/stdout.

Development mode (ts-node)

npx ts-node src/server.ts

Auto-bridge setup

Run auto_bridge.sh once after cloning (or whenever your MCP config changes). It scans well-known config locations, detects your Node environment, and writes .env.mcp plus a descriptor into ~/.antigravity/mcp/.

chmod +x auto_bridge.sh   # already done if you followed setup
./auto_bridge.sh

---

2 · Importing the SQLite Skill into Antigravity Manager

1. Open the Antigravity desktop app and navigate to the Manager View (sidebar → 🧩 Manager).
2. Click Import Skill (top-right of the Skills panel).
3. In the file picker, navigate to:

   /path/to/antigravity-mcp-bridge/skills/sqlite_skill.json
   

   and select it.
4. Antigravity will validate the skill schema and display a "SQLite Database Connector" card under the Data Sources category.
5. Click Configure on the card and fill in the required field:
   • SQLite Database Path — absolute path to your .db / .sqlite file, e.g. /Users/sameer/data/myapp.db
6. Click Save & Activate. The skill is now globally available to all agents.

Tip: You can activate / deactivate the skill at any time from the Manager View without removing the import.

---

3 · Testing the Connection with the Built-in Browser

Antigravity ships a built-in MCP Inspector browser that lets you call tools interactively.

Step-by-step

1. Start the MCP server (see §1 above) so it is listening.
2. In Antigravity, open Settings → MCP Servers and click + Add Server.
3. Set:
   • Transport: stdio
   • Command: node /path/to/antigravity-mcp-bridge/dist/server.js
4. Click Connect. The status indicator should turn green.
5. Navigate to Tools tab inside the MCP Inspector.
6. Select the system_status tool, leave the input blank (no parameters), and click Run.
7. The response pane should display a JSON payload similar to:

   {
     "currentTime": "2026-04-23T02:19:15.000Z",
     "platform": "darwin",
     "release": "24.4.0",
     "architecture": "arm64",
     "hostname": "MacBook-Pro",
     "cpus": 10,
     "totalMemoryMB": 16384,
     "freeMemoryMB": 4096,
     "uptime": "3h 42m",
     "nodeVersion": "v22.0.0"
   }
   

8. To test the SQLite skill, ensure the skill is imported and configured (§2), then ask an agent: "List all tables in my database." The agent will invoke sqlite_list_tables via the MCP bridge automatically.

---

Available Tools

Tool	Description
system_status	Returns current UTC time and OS details
sqlite_query	Execute a read-only SQL SELECT
sqlite_execute	Execute a write SQL statement
sqlite_list_tables	List all tables in the SQLite DB
sqlite_describe_table	Describe columns of a table

---

Scripts

npm run build    # tsc — compile src/ → dist/
npm run dev      # ts-node src/server.ts (watch mode)
npm run start    # node dist/server.js

---

Adding More Tools

Open src/server.ts and call server.tool(name, description, inputSchema, handler):

server.tool(
  "my_new_tool",
  "Does something useful.",
  { param: z.string().describe("An example parameter") },
  async ({ param }) => ({
    content: [{ type: "text", text: `You passed: ${param}` }],
  })
);

Rebuild with npm run build and reconnect in Antigravity.

---

License

MIT

Created by:

Sameer Abrar, Flexcrit Inc