Browsentic

People who want an AI agent to act on their behalf in the browser today have to describe pages to it, re-authenticate in throwaway profiles, or hand credentials to hosted browser automation services. That means losing cookies, two-factor state and logged-in sessions, or routing browsing through someone else's data center. Repetitive multi-step web jobs, like working through a form or a site with no built-in tool, still have to be done by hand or re-explained every time. Existing setups also often require a separate API key or a new browser environment just to get an agent to click around.

Browsentic is a browser extension (Chrome and Chromium, Manifest V3) paired with a local daemon that runs entirely on the user's machine, no hosted relay and no API key. It spawns the AI agent CLI the user already has logged in, Claude Code, Codex or Antigravity, and lets it drive the real tab in front of them inside their existing signed-in session. Users can record themselves doing a job once and later say 'do it like last time,' let the agent explore and map a site's pages into notes for future sessions, run several tabs each with their own conversation, point at a specific element with a lens, or write skills in plain markdown that the agent can use. Consequential actions like form submission require approval in the panel, agent-written tools show their full source before running, and the daemon uses handshake-origin checks plus a pairing token to stop random pages from connecting. It also speaks MCP over stdio so terminal clients like Cursor, Zed or Claude Desktop can drive the same paired browser.