Getting Started

Krometrail gives your coding agent runtime context it can't get from source code alone. Record a browser session while you reproduce a bug, drop a marker, and hand it off — your agent gets the network requests, console errors, framework state, and screenshots it needs to investigate. It also bridges the Debug Adapter Protocol (DAP) so your agent can set breakpoints, step through code, and inspect variables across 10 languages.

Prerequisites

• Bun (recommended) or Node.js 18+
• For debugging: language-specific debuggers (check with krometrail doctor)

Install

bunx (no install)

# Run directly without installing
bunx krometrail --version

npm global

npm install -g krometrail
krometrail --version

npx (no install)

npx krometrail --version

MCP Configuration

Add Krometrail to your agent's MCP config to expose all tools automatically:

{
	"mcpServers": {
		"krometrail": {
			"command": "bunx",
			"args": ["krometrail", "--mcp"]
		}
	}
}

The agent will discover debug_*, chrome_*, and session_* tools automatically — no further setup needed.

Verify the Installation

Check that debuggers are available for the languages you need:

krometrail doctor

This shows each supported language adapter, whether its debugger is installed, and the installed version.

First Steps

• Browser observation — Start recording a session and investigate what happened
• Runtime debugging — Launch a debug session against a Python, Node.js, or Go program
• Agent configuration — Set up Claude Code, Codex, or Cursor