What it is
fastbrowse is an experimental browser agent for tasks like lookups, sign-ins and checkout. It indexes the page into candidates, has Jev pick one action, and returns answers where every claim cites a verbatim quote.
How it uses Jev
Jev picks each action from the controls already on the page, so a step is a classification rather than a generation. The LLM plans and reads; code owns verification, safety and secrets. The picked action is executed in the browser.
Primitives:choice
Technique worth stealing
Index the page into candidates and have a choice model pick one, so no selector is ever invented.
Try it
uvx fastbrowse "What is the title of the top story right now?" --start https://news.ycombinator.com/
Evidence
Each line is one question put to Jev about the README. ≥ 0.60 reads as yes, ≤ 0.40 as no; in between Jev is not making a call.
- Jev-centricyes0.91
- Shows a System One patternyes0.77
- Handles uncertaintyno0.05
- Measuredno0.24
- Runnableyes0.84
- Worth recommendingunclear0.47
- Model replicano0.11
- Problem scopescore on a 0–2 scale1.22
- About Jevyes0.96
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 20 Sept 2026.