Jev in Practice: Browser Use and Agent Workflows

A roundup of Jev-related open-source repos by category, including browser/PC control, code review and MCP tools, with star counts such as browser-use's jev-ultrafast.

The author open-sourced jev-sift, which uses Jev to score files, tools and websites so an agent can decide whether to read, call or browse them.

A YC repost highlights AgentRun, an agent test harness built with Jev, as an example of how Jev fits into agent workflows.

A ten-step guide on turning agent branches into decision points with the Choice, Score and Noul primitives, with speed and cost figures for batch decisions, Browser Use and Mobile Jev.

The author and the developer of the mini apps try to explain Typesafe's Jev decision model as simply and practically as possible, and ask what people plan to build with it.

The open-source tool Tocsin groups 22.8 million log lines into 11,812 patterns, asks Jev about each pattern once, and surfaces 123 patterns worth attention in 6 minutes for 64 cents.

A demo shows Jev choosing the agent, model, project and computer in real time as you type your prompt.

OpenRouter uses practical examples to explain how Jev answers yes/no and multiple-choice questions with a confidence score, at 10x lower cost and higher speed than an LLM.

The author built a mechanism where Jev acts as an alignment verifier, detecting when an agent deviates from the spec and blocking out-of-bounds actions so the agent doesn't lie to you.

Rather than simply picking a cheaper model, it splits work into logical threads and prices cache reads and writes, cold context, expected output and the cost of switching back into its routing decisions.

Send unstructured state and a typed question, and Jev returns a typed decision with a calibrated probability at low latency; input costs $0.042 per million tokens and output is free.

Steps: get an API key from the Typesafe console and set it in .env, install the typesafe-ai skill with npx skills add, then have Hermes use it to analyze your codebase for speedups.