agnt 0.12.4

MCP server for AI coding agents - process management, reverse proxy with traffic logging, browser instrumentation, and sketch mode

agnt

Give your AI coding agent browser superpowers.

agnt is a new kind of tool designed for the age of AI-assisted development. It acts as a bridge between your AI coding agent and the browser, extending what's possible during vibe coding sessions.

What Does It Do?

When you're in the flow with Claude Code, Cursor, or other AI tools, agnt lets your agent:

• See what you see - Screenshots, DOM inspection, visual debugging
• Hear from you directly - Send messages from browser to agent
• Sketch ideas together - Draw wireframes directly on your UI
• Debug in real-time - Capture errors, network traffic, performance
• Extend its thinking window - Structured data uses fewer tokens than descriptions

Installation

pip install agnt
# or
uv pip install agnt
# or
pipx install agnt

Quick Start

As MCP Server (Claude Code, Cursor, etc.)

Add to your MCP configuration:

{
  "mcpServers": {
    "agnt": {
      "command": "agnt",
      "args": ["mcp"]
    }
  }
}

Or with uvx:

{
  "mcpServers": {
    "agnt": {
      "command": "uvx",
      "args": ["agnt", "mcp"]
    }
  }
}

As PTY Wrapper

Wrap your AI coding tool with overlay features:

agnt run claude --dangerously-skip-permissions
agnt run cursor
agnt run aider

This adds a terminal overlay menu (Ctrl+P) and enables browser-to-terminal messaging.

Core Features

Browser Superpowers

Start a proxy and your agent gains eyes into the browser:

proxy {action: "start", id: "app", target_url: "http://localhost:3000"}

Now your agent can:

• Take screenshots
• Inspect any element
• Audit accessibility
• See what you clicked

Floating Indicator

Every proxied page gets a floating bug icon. Click to:

• Send messages to your agent
• Take area screenshots
• Select elements to log
• Open sketch mode

Sketch Mode

Draw directly on your UI:

• Shapes: rectangles, circles, arrows, freehand
• Wireframes: buttons, inputs, sticky notes
• Save and send to agent instantly

Real-Time Error Capture

JavaScript errors automatically captured and available to your agent - no more forgetting to mention them.

MCP Tools

Tool	Description
detect	Auto-detect project type and scripts
run	Run scripts or commands
proc	Manage processes
proxy	Reverse proxy with instrumentation
proxylog	Query traffic logs
currentpage	View page sessions
daemon	Manage background service

Browser API

The proxy injects window.__devtool with 50+ diagnostic functions:

__devtool.screenshot('name')              // Capture screenshot
__devtool.inspect('#element')             // Full element analysis
__devtool.auditAccessibility()            // A11y audit
__devtool.sketch.open()                   // Enter sketch mode
__devtool.interactions.getLastClick()     // Last click details

Configuration

Create .agnt.kdl in your project:

scripts {
    dev {
        command "npm"
        args "run" "dev"
        autostart true
    }
}

proxies {
    frontend {
        target "http://localhost:3000"
        autostart true
    }
}

Documentation

• GitHub
• Full Docs

License

MIT