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How to run a 7 second browser agent and watch every decision with Jev Ultrafast

Start the local inspector and see each element table, operation probability and executed action.

Short answer: Run git clone https://github.com/browser-use/jev-ultrafast.git and cd jev-ultrafast; then run uv sync then cp .env.example .env and add TYPESAFE_API_KEY and TEXT_MODEL_API_KEY; start the inspector with uv run jev and open http://127.0.0.1:8766. All steps.

Credentials. The agent drives your existing Chrome profile, so owned tabs share your logins; use a separate profile for experiments.

Who it is forA developer evaluating browser agents who wants to see why one is fast before adopting it.

The problemMost browser agents are slow because they screenshot and call a big model for every step, and you cannot see why they chose an action.

The outcomeA local demo that runs a real task and shows numbered elements, operation and target probabilities and every executed action.

What you need first

  • Python with uv
  • Chrome with remote debugging allowed (connected through Browser Harness, installed by uv sync)
  • TYPESAFE_API_KEY and TEXT_MODEL_API_KEY (an OpenRouter key in the example config)
  • Live examples make paid API calls

Steps

  1. Run git clone https://github.com/browser-use/jev-ultrafast.git and cd jev-ultrafast
  2. Run uv sync then cp .env.example .env and add TYPESAFE_API_KEY and TEXT_MODEL_API_KEY
  3. Start the inspector with uv run jev and open http://127.0.0.1:8766
  4. Click Start demo, then Run automatically; use Choose next to pause before each action
  5. If Chrome does not connect, run uv run browser-harness --doctor and allow remote debugging

Prompt for your agent

Set up browser-use/jev-ultrafast locally, start the inspector with uv run jev, run the demo step by step with Choose next, and summarize for each step the operation chosen, its probability and the target element.

Caveat.

Use this in your AI agent

Ask your agent

Using the Deduped MCP, get the setup steps for browser-use/jev-ultrafast and "Run a 7 second browser agent and watch every decision"

Add Deduped to Claude Code once

claude mcp add --transport http deduped https://dedupedai.com/mcp

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