Gemini CLI

HTTP 426 upgrade-required for Gemini CLI

io.github.sadri-dridi/http-426

Meaning of HTTP 426.

client:Gemini CLI transport:streamable-http tools:31

Install HTTP 426 upgrade-required in Gemini CLI

~/.gemini/settings.json · windows: %USERPROFILE%\.gemini\settings.json

{
  "mcpServers": {
    "http-426": {
      "httpUrl": "https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-426/mcp"
    }
  }
}

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

What Gemini CLI can do once it is connected

All 31 tools →

HTTP 426 upgrade-required in other clients

HTTP 426 upgrade-required MCP server