dev3000

Overview of dev3000

What it is

d3k (dev3000) is an agent-first local web debugging runtime. It starts a development server, opens a monitored browser with a project-stable Chrome profile, and provides a unified timeline of server logs, browser errors, network activity, interactions, and screenshots. The primary interface is the d3k skill for coding agents; a standalone TUI is also available but not required for the agent workflow. Every app gets a stable Portless URL by default, so browser state and callbacks do not move when the underlying development port changes.

Key features

• Captures development-server output, browser console messages and exceptions, network requests and responses, user interactions, navigation and error screenshots, and Chrome DevTools Protocol events.
• Provides a persistent Chrome profile per project under ~/.d3k//chrome-profile/ that preserves login state, cookies, and local storage across debugging sessions.
• Offers a Portless URL feature that gives each app a stable, port-free HTTPS URL (e.g., https://my-app.localhost) so browser state remains unchanged when the dev port changes.
• Includes agent commands such as d3k status --json, d3k errors --context, d3k logs, and d3k agent-browser for driving the managed browser.
• Supports auto-detection of common web projects including Next.js, Vite, React, Vue, Svelte, Astro, Django, Flask, FastAPI, and Rails.
• Stores artifacts per project: active session, consolidated log, screenshots, Chrome profile, and crash log.

Use cases

• Debugging a web application by letting a coding agent inspect a unified timeline of server and browser events.
• Reproducing bugs with a managed browser that retains login state and cookies across sessions.
• Testing OAuth and other auth-sensitive flows without breaking sign-in due to separate browser identities.
• Running automated debugging or testing in CI with headless Chrome (--headless).

Getting started

Node.js 24 or newer is required. Install the runtime globally:bashbun install -g dev3000or with npm:bashnpm install -g dev3000Install the d3k skill for coding agents:bashbunx skills add vercel-labs/dev3000 --skill d3k --agent '*' -g -yAfter installation, run d3k portless setup for one-time administrator authorization to generate/trust the local HTTPS CA and install a root-owned startup service on port 443. Then start the runtime with d3k -t in agent-safe mode.

License and pricing

The project is licensed under MIT. It is open source and free to use.

Based on the project's public README and repository metadata.