Jev model router demo

This is a throwaway local prototype for one question: can Jev reliably send complex or uncertain coding tasks to Codex Astra while routing contained mechanical work to Grok Build?

The router uses Jev only for the decision. It asks three typed questions in one request:

• Choice: Grok Build or Codex Astra
• Score: complexity from mechanical to high consequence
• Boolean: whether planning or investigation should happen before code changes

The final policy is intentionally conservative. If Jev is uncertain, the complexity score is high, or planning is likely, the task goes to Astra.

Targets

• Grok Build: installed locally, default model grok-4.6
• Codex Astra: installed locally as model gpt-6-astra

Set up

cd /Users/simsies/github/jev-model-router-demo
npm install

Add a Vercel AI Gateway key to the already gitignored .env.local:

AI_GATEWAY_API_KEY=your_key_here

Run the six-task demo

npm run demo

This classifies six tasks in parallel and prints the chosen harness, route probability, complexity score, planning probability, and latency. It does not launch either coding agent.

Route your own task

npm run route -- "Add an aria-label to the close button and run its existing test."

Route and launch

npm run route -- \
  "Trace the intermittent authentication failure without weakening security." \
  --cwd /Users/simsies/github/example-project \
  --launch

Launches are deliberately safe for the demo:

• Codex Astra runs ephemerally with a read-only sandbox.
• The Codex launch accepts an explicitly selected non-Git demo directory.
• Grok Build runs in plan mode with web search and subagents disabled.

Neither route edits code in this prototype. After the routing policy is calibrated on real tasks, execution permissions can be designed separately.

Privacy

Jev requests enable Zero Data Retention and disallow prompt training. Do not paste secrets, credentials, private customer data, or unredacted logs into a filmed task.