unbrowser
The cheap browser pass for agents. One native binary. No Chrome.
Official MCP Registry identity: mcp-name: io.github.protostatis/unbrowser
unbrowser is a stateful, non-visual web runtime for agents. It sits between curl/WebFetch and a real browser: it retains cookies and DOM state, returns queryable element refs, handles links and HTML forms, detects challenge and SPA signals, and can run bounded QuickJS page scripts when static HTML is not enough.
Default
navigateis a fast static/SSR pass. Setexec_scripts: trueonly when you need bounded QuickJS execution. Heavy SPAs, pixels, V8 fidelity, extensions, and interactive anti-bot challenges belong in a real Chrome tier.
Try the live public-web demo before installing. It accepts only the fixed public source sets shown on the page; do not send private data, cookies, or authenticated tasks through it. A shared Streamable HTTP MCP endpoint is available at https://unchainedsky.com/unbrowser-mcp for public smoke tests; production sessions should use a local install.






