MCP Mode: Stdout logs break Claude MCP compatibility due to non-JSON output

[FayyasHussain]

this is what LLM suggested (Copy-Pasting)

When using jarvis-appium as an MCP server with Claude (Anthropic), the stdout logs like All tools registered, Waiting for client connections, etc., are not valid JSON and cause Claude to fail MCP connection with errors like:

Expected Behavior

Claude expects valid JSON-RPC 2.0 messages over stdio. Any plain-text logs on stdout cause JSON parsing to break.

Suggested Fix

Add a CLI flag like --mcp or --quiet that:

• suppresses all console.log() output on stdout
• uses stderr for debug logs instead
• only sends structured JSON-RPC responses on stdout

Environment

• OS: macOS
• Claude Desktop App
• Device connected: Android real device
• Command: npx jarvis-appium

Logs

[saikrishna321]

@FayyasHussain we recommend using it with cline or roo in VS code or cursor