Fast Browser

fastbrowse is a browser agent for tasks like sign-in, lookup, form filling, and checkout. It’s built for teams that want fewer “invented selector” failures and answers grounded in what the page actually shows.

It differs from screenshot-to-text agents by separating action selection, verification, and sensitive data:

• Index real controls: it indexes “a page's real controls” and chooses from what exists on the page. That means it doesn’t “invent a selector” and retry.
• Jev picks next action: a “Jev choice model” selects from discrete candidates derived from the page’s interactive elements.
• Deterministic verification and gates: “deterministic code owns verification, authorization gates and secrets,” so commit actions like final submit are not treated as guaranteed.
• Verbatim grounding: “every claim in the final answer is backed by a verbatim quote from the page.” If a fact isn’t visible, the run reports what it found instead.
• Authorization for irreversible steps: if you don’t pass the flag, it stops at “needs_confirmation with the order filled in and unplaced,” and only proceeds when --authorize is provided.
• Zero-knowledge secrets: secrets are handled via --secret so “the password is never in the task and never reaches a model,” with credentials typed by code “it belongs to.”