llx

The ultrafast browser and coding agent.

llx is a native browser, terminals and a coding agent in one binary under 4 MB. It writes the code, tests it in the browser and fixes what it finds; llx mcp gives the same window to Claude Code, Codex or any agent.

npm install -g @rsaryev/llx

macOS · Linux · under 4 MB · MCP setup · Read the docs

/login, the modes and a task, in a real sessionRecorded live with asciinema

Everything in one window.

Browser pages and terminals are tabs of one native window, grouped by project. Give the agent a goal and it is done in seconds: find and book a flight, fill a form, check a page. In the next tab it runs your tests, servers and REPLs, typing and reading as you would, without a second app. llx works there, and so do Claude Code and Codex through llx mcp. You watch every tab, and point at what to change.

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How you use it

  1. Open. The agent opens pages and terminals as tabs, each project’s together.
  2. Watch. Every tab stays live: each click, each key, each command as it runs.
  3. Comment. Press the comment icon, click what is wrong, write a note. Repeat.
  4. Send. Send hands the batch to the agent that opened the page, and it fixes them.

What the agent gets

  • the element’s CSS selector and path
  • its source file and component, from your dev build
  • its box, role, text and computed styles
  • a picture of it, and your note

Not “the blue button at the bottom”, but form#checkout > button.submit in src/Checkout.tsx:42.