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Model router for Claude Code using Jev
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- 0
- Last pushed
- Updated Sep 2026
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CommunityJev Agents & MCP
Jev Model Router — satviksinha
Claude Code routing mod that asks Jev which model tier and effort each turn needs, then directs that turn to haiku, sonnet, opus, or fable with visible route lines.
- Stars
- 6
- Language
- TypeScript
- License
- MIT
- Published by
- Community
- Author
- satviksinha
- Last verified
- Oct 2026
About this project
Picks the model for each turn with Jev, TypeSafe's decision model. Supports both TypeSafe's direct API and the Vercel AI Gateway. You type a prompt. Before the turn runs, Jev is asked two questions at once: which tier should answer this, and how hard should it think. Every model request in that turn then goes to the model Jev named, and a line above the reply says which one.
Quoted from the project's README. Read the full README.
Used inJev for Software & DevTools
- Languages
- TypeScript
Highlights
- Asks Jev tier plus effort before the turn runs and routes every model request in that turn to the named model.
- Defines four tiers from trivial lookups to planning and debugging, with policy strings as the routing contract.
- Prints route, confidence, timing, answering model, and cache share in replies, footers, and the /jev command.
- Supports a quiet mode that hides markers without turning routing off.
Watch out
Fails open: a missing key, unpaid gateway account, or disabled hooks flag looks like routing doing nothing, so run the bundled check command. Copy reviewed against the repository README on 2026-10-04, not from running it.
Questions about this entry
Short answers drawn from the linked project or page.
Edit the tier criteria strings in hooks/policy.ts. Those strings are what Jev is told each tier is for, so changing the wording changes routing without other code changes.
The router prefers TypeSafe direct when both keys are set, and JEV_ROUTER_PROVIDER forces either side. A gateway key on an account without a payment method fails with a verification error, and the turn runs unrouted.
Yes, and it is visible. The cache is per model, so the turn after a switch runs cold and reads show which turns paid it. Cache reads bill at a fraction of uncached input, so watch whether switching eats what cheaper tiers save.
Check three places in order: the /jev command for full state and per-turn reasons, the first line of the reply for the requested route, and the footer for what the API confirms actually answered. A mismatch marker names the model that really replied.
Put your TypeSafe or AI Gateway key in the env block of ~/.claude/settings.json and set CLAUDE_CODE_ENABLE_FUNCTION_HOOKS to 1, which is required or the mod loads and silently does nothing. Then run claude --plugin-dir pointing at the folder, or move it to ~/.claude/skills/jev-router/ where it loads on its own next session.
haiku to claude-haiku-4-5, sonnet to claude-sonnet-5, opus to claude-opus-5, and fable to claude-fable-5-1. The mapping criteria live in TIER_CRITERIA in hooks/policy.ts, and those strings are what Jev is told each tier is for, so editing them is how you change routing without touching anything else.
/jev quiet drops the route line and footer without turning routing off, and /jev loud brings them back. The state shows sticky on with a switch needing 75%, meaning the pair stays fixed until a new decision clears that bar, and a budget of 1500ms; /jev prints the full recent-turn history with model, effort, and confidence.
Other listings of this project
Forks and copies of this project in the directory. This entry is the canonical one.
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