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Welder for Antigravity

Add one entry to Antigravity’s MCP config, then sign in to Welder from the Antigravity App.

About 2 minutesOne config entry, then sign in.

Steps

  1. 1

    Add Welder to your MCP config and save. In the IDE, open it with … → MCP Servers → Manage MCP Servers → View raw config.

    ~/.gemini/config/mcp_config.json
    {
  "mcpServers": {
    "welder": { "serverUrl": "https://weldergtm.com/mcp" }
  }
}
  2. 2

    In the Antigravity App, open Customizations → Installed. Under MCP Servers, click Authenticate next to welder.

  3. 3

    Sign in to Welder in your browser and copy the authorization code. Paste it into Enter authorization code and click Submit.

  4. 4

    Test it. Ask Antigravity something.

    Under MCP Servers, welder shows a green dot.

    AskWhich accounts can you post to with Welder?
    Your AI assistant

    Which accounts can you post to with Welder?

    Welder is connected. You can post to these accounts:

    TikTok Instagram

Didn’t work?

The usual fixes. If none helps, write to hello@weldergtm.com.

Antigravity asks before every Welder action

MCP tools ask for your approval by default. Choose Allow on the card, or add the allow rule mcp(welder/*) to your global permissions in Settings.

welder doesn’t appear or shows an error

Check that the entry uses serverUrl (or url), not httpUrl, and that you saved ~/.gemini/config/mcp_config.json, or .agents/mcp_config.json in your workspace. Then choose Restart from the ⋮ menu next to welder.

Welder says posting more isn’t included

Your first 3 posts are free. After that, posting needs a plan: start your 3-day free trial in the Welder app at weldergtm.com, then ask again. Connecting accounts, uploading and checking a post work either way.

Prefer to use a key instead?For a machine without a browser. Create one under Advanced → Keys in the app; it is shown once.

With a key, add a header:

~/.gemini/config/mcp_config.json
{
  "mcpServers": {
    "welder": {
      "serverUrl": "https://weldergtm.com/mcp",
      "headers": { "Authorization": "Bearer {key}" }
    }
  }
}
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Antigravity is a trademark of its owner. Welder is not affiliated with it.