Overview & result
jev-cua is a local Codex/Waku plugin for general Mac computer use: launching installed apps, reading Accessibility state, clicking, typing non-secret text, pressing keys, invoking menu items and scrolling, with an optional compiled fast path for reviewed browser workflows. The README states that the release does not establish a "1000x" speedup and that such a claim would need end-to-end measurement.
From the original post
Production local Cua + TypeSafe Jev fast-path runtime for Codex and Waku
How Jev fits in the loop
- The plugin returns opaque references for installed apps and Accessibility elements.
- Codex or Waku acts through bounded tools: launch an exact app, click, type non-secret text, press keys, invoke menu items, scroll.
- For repeated tasks, Jev can recommend one of several reviewed workflows; a compiled adapter then runs it deterministically.
- Each action is checked against an exact postcondition and executed at most once.
How to reproduce
- Inspect the original showcase and source material at https://github.com/Eronmmer/jev-cua
- Verify the bounded prompt and input candidate schema configured for Jev
- Benchmark decision latency and classification accuracy against baseline models
Why this build matters
The author found that asking Jev to pick an already-proven next step added latency and false rejections, so Jev is reserved for mapping an ambiguous request across reviewed workflows.
Limitations
- The README says the release does not establish a "1000x" speedup.
- It is a reliability and least-authority layer, not a hard sandbox against an agent with unrestricted shell access.
- The Keychain workflow digest is a tamper-evident pin, not proof of human presence.