Gemini CLI

FIXSIM for Gemini CLI

io.github.gammathreetrading/fixsim

Test FIX from Claude, ChatGPT, or Cursor: free sandbox FIX sessions or your own FIXSIM instances.

client:Gemini CLI transport:streamable-http tools:21

Install FIXSIM in Gemini CLI

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

{
  "mcpServers": {
    "fixsim": {
      "httpUrl": "https://mcp.fixsim.com/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

FIXSIM in other clients

FIXSIM MCP server