Gemini CLI runtime base64.decode

How to: Gemini CLI runtime base64.decode

client:Gemini CLI transport:streamable-http tool:base64.decode

Add runtime to Gemini CLI

01
Open ~/.gemini/settings.json and merge this in. Keep any servers already there.

{
  "mcpServers": {
    "runtime": {
      "httpUrl": "https://mcp.formatho.com/mcp"
    }
  }
}

02
Save the file and restart Gemini CLI.
03
Ask for something base64.decode does. Gemini CLI lists the server's tools on connect and calls base64.decode itself — you do not invoke it by name.
04
If nothing happens, check the server is running and that runtime's identifier in your config matches the one above exactly.

Gemini expands $VAR and ${VAR} inside env values, so a secret can live in your shell rather than this file. Gemini CLI docs

Same tool, other clients

This list was read from the server itself, by connecting to it and calling tools/list on 24 September 2026. It is what the server actually exposes, not what its listing claims.

Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.

runtime MCP server