jev-mcp v0.1.0 — JEV-powered browser automation for AI agents

First public release of jev-mcp, an MCP server that lets Claude Code, Codex and other AI agents drive a real Chrome browser with JEV, TypeSafe's System One decision model.

Highlights

• Autonomous browser tasks (jev_task):
  • dismisses consent and promo walls;
  • fills fields from your params and picks autocomplete suggestions;
  • handles date pickers, including low-fare calendars;
  • submits, follows results that open in new tabs;
  • extracts results to your schema with min/max/first/all.
• Page understanding for decision models:
  • regions and stable element refs;
  • names for unlabeled inputs;
  • occlusion and blocking-overlay detection;
  • shadow DOM and cross-origin iframes;
  • CAPTCHA detection.
• Human-in-the-loop by calibrated confidence. Questions reach the agent via Claude Code channels, jev watch, an appendix to any tool result, or jev_wait.
• Fully configurable thresholds: global, per domain, per task and live; presets cautious, balanced and autonomous.
• Two drivers on one CDP engine: your Chrome through the extension (with a side panel), or jev's own headful or headless profile.
• Safety: irreversible actions ask first, secrets never reach the model, hidden text is dropped, allow-lists and budgets.
• Debug UI:
  • timeline with probability bars and threshold markers;
  • page inspector with live highlighting;
  • replay and TypeSafe playground links;
  • question inbox, settings, site memory, calibration.
• Providers: OpenRouter (typesafe/jev-1.13) or the official TypeSafe API, with optional failover.

Numbers

• Airline-search fixture end to end: 8 steps, 24 JEV calls, 0 questions, $0.0019, 19 s.
• Grounding eval: 41/41 correct, expected calibration error 0.02, median decision 0.45 s.
• 111 automated tests plus live tests and evals.

Install

git clone https://github.com/legostin/jev-mcp.git && cd jev-mcp
npm install && npm run build:web
node bin/jev.mjs install
jev settings set providers.openrouter.apiKey -
jev doctor

jev-extension-0.1.0.zip is the prebuilt Chrome extension. Unzip it, load it unpacked in chrome://extensions, then run jev pair.