How is rewrite mode different from proxy mode?

Rewrite changes the turn model so the indicator follows the routed model; proxy runs a loopback gateway that forwards to the upstream and pipes the stream back, keeping the picker on Auto.

What does Jev actually see about my turn?

A hard-capped digest of the turn; the request asks which fleet entry fits and runs in about 70-500ms per turn.

When does routing give up and use fallback?

Below 0.55 confidence, over 1500ms timeout, on error, or with no key; proxy and rewrite both log the decision and pass upstream usage through verbatim.

Why does install need GitHub Packages setup?

The package lives as @johnpozy/codriver-opencode on GitHub Packages, so npm needs the @johnpozy scope, username, and read:packages token in ~/.npmrc before referencing it in opencode config.

Where does Codriver keep its configuration and when is it read?

It reads ~/.config/codriver/config.json on every turn, so editing the fleet or fallback affects the very next message; the file holds the fleet, fallback, route_threshold, route_timeout_ms and log_path.

Does Codriver work without a TypeSafe key?

Yes, it falls back to a deterministic fixture client, so routing works end-to-end keyless for testing, but the decisions are canned rather than from Jev; CODRIVER_JEV=fixture forces that even when a key exists.

Which upstreams can Codriver proxy?

The prefix resolves in order: a same-named provider in your opencode config supplies its baseURL and key, then builtin gateways vercel and openrouter read the key from opencode's auth.json api entries, and any unmatched id goes to the default CODRIVER_UPSTREAM_BASE_URL.

CommunityJev Models & Reimplementations

Codriver

Per-turn opencode router that asks Jev which fleet model fits the turn, rewriting to that model or falling back on low confidence.

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Stars: 0
Language: TypeScript
Published by: Community
Author: johnpozy
Last verified: Oct 2026

johnpozy/codriver

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Instead of locking a whole session to one model, you pick Auto in the model picker — and for every turn, Codriver asks Jev (TypeSafe AI's non-generating "System One" decision model) which concrete model from your fleet fits THIS turn, then rewrites the message to that model before it is sent.

Forks: 0
Last pushed: Updated Sep 2026

Repo stats from the GitHub API, cached Oct 2026.

About this project

Codriver is a per-turn model-routing plugin for opencode. Instead of locking a whole session to one model, you pick Auto in the model picker — and for every turn, Codriver asks Jev (TypeSafe AI's non-generating "System One" decision model) which concrete model from your fleet fits THIS turn, then rewrites the message to that model before it is sent.

Quoted from the project's README. Read the full README.

Tagscommunity github

Works forJev for Classification

Used inJev for Software & DevTools

Languages: TypeScript

Highlights

Adds codriver/auto picker; each Auto turn makes one Jev call and rewrites to the chosen fleet entry before sending.
Falls back on low confidence under 0.55, timeout over 1500ms, error, or missing key; config re-reads every turn.
Shares one fleet file outside agent config; starter fleet prefers custom providers then built-in coding defaults.
Proxy mode keeps picker on Auto via loopback gateway, forwarding upstream and piping streaming response untouched.

Watch out

Needs opencode with reachable provider models; unset key uses deterministic fixture client with canned decisions. Copy reviewed against the repository README on 2026-10-04, not from running it.

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