Limitations

The MCP server inherits Jint.Browser limitations:

• No rendering, screenshots, PDFs, pixels, native window, canvas, WebGL, or media.
• No real visual layout; scrolling and action geometry are synthetic.
• No iframe scripting, IndexedDB, WebAssembly, CSP enforcement, SharedWorker, or ServiceWorker.
• No drag and drop or clipboard tools.
• Images are not fetched for display.
• Hover dispatches movement, not mouseenter or other pointer-boundary events.

Protocol and tool limits:

• The packaged command supports stdio only.
• AddJintBrowser is one process-level session and must not be reused unchanged for a shared HTTP service.
• Snapshots are capped at 40,000 characters by default.
• wait_for accepts a selector or text; it is not a general JavaScript condition.
• evaluate runs one host-supplied expression; page code still cannot call eval or new Function under the default untrusted profile.
• Cookie enumeration requires the default enumerable cookie jar.
• Element references expire on navigation.
• Tools cover one page per agent session.
• Network results are summaries, not complete request/response archives.

Use snapshots rather than asking for images, take a fresh accessibility snapshot after actions that navigate, and treat done: false as a recoverable miss rather than a transport failure.