Antigravity MCP for Bookmarks (2026 Setup Guide)

Antigravity is Google’s agentic development platform, a VS Code-based editor with an Agent Manager that runs tasks on your behalf. It speaks MCP, so you can give it access to everything you have saved on X, Reddit, and LinkedIn and search it by meaning while you work.

Why bookmarks belong in an agent

The saving is the easy part. You read a good thread about connection pooling, you bookmark it, and three weeks later you are building exactly the thing it would have helped with. The save is buried somewhere you cannot search.

With ContextBolt connected, you ask the agent to find it. The search is semantic, so you describe what you need rather than recalling the words you saw. Antigravity already understands your codebase, and now it can also draw on what you have been reading.

That matters more with an agentic editor than a conventional one. When the Agent Manager is running a task on your behalf, your saved material becomes part of the context it works from, not something you remember to look up.

The Antigravity mcp_config.json entry

Use https://api.contextbolt.app/mcp and complete the browser sign-in if your client supports remote MCP with OAuth. Enter your Pro account email and email code, then allow the connection. For a client that cannot complete that flow, use the personal-URL compatibility configuration shown here. Copy the full private URL from the extension under Settings, MCP Integration, Older clients and replace the example URL with it.

Open the config from Settings, then Customizations, then Manage MCP Servers, then View raw config. Add ContextBolt under mcpServers:

{
  "mcpServers": {
    "bookmarks": {
      "serverUrl": "https://api.contextbolt.app/mcp/YOUR_TOKEN"
    }
  }
}

The key is serverUrl, not url. Antigravity inherits this from Windsurf’s config style, and it is the detail that trips up anyone coming from Cursor or VS Code where the same field is called url. Because your token sits in the URL path, you do not need a headers block.

Save the file and hit Refresh in the MCP Servers panel.

If it connects but finds nothing

This is the failure worth knowing about, because it does not look like what it is. MCP reads from your synced library. If cloud sync is switched off in the extension settings, the server connects perfectly, reports healthy, and returns an empty result for every query.

Confirm the Pro badge is green in the extension, wait a minute for the first upload, and try again before you touch the config.

Working patterns

Ground a task before it starts: ask the agent to check your bookmarks for relevant patterns before it writes anything, so the output builds on material you already trust.

Save without switching: anything worth keeping goes in with save_bookmark from inside the editor.

Search across platforms at once: one query covers your saved pages, X, Reddit and LinkedIn together, which is usually where the answer actually lives.

If you are new to this, the connect Claude to your bookmarks walkthrough covers the same idea in a different client, and the ContextBolt bookmarks overview explains what the library does before you wire it into anything.