Cannot add MetaMCP endpoint in Google Antigravity, throws failed to connect (session ID: ): session not found

[adrianharabula]

When connecting Google Antigravity (IDE, CLI, and UI) to a MetaMCP endpoint configured with Streamable HTTP transport, the connection fails with this error:

The error is:

error: calling "initialize": sending "initialize": failed to connect (session ID: ): session not found

The exact same MetaMCP Streamable HTTP setup works perfectly when called from Claude Code, but it fails when initialized via Antigravity.

MetaMCP Version: v2.4.22 running in Podman/Docker

[adrianharabula]

I partially fixed this by wrapping metamcp in mcp-remote:

{  
"mcpServers": {
    "MetaMCP-Bazzite": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "http://localhost:12008/metamcp/personal/mcp",
        "--header",
        "Authorization: Bearer XXXXXXXXX"
      ]
    }
}

Now it works in Antigravity UI, Antigravity IDE. Not working in Antigravity CLI (agy) (still stuck at initializing phase for mcp connection).

Much better already!