Jev ecosystem & how to access it
Jev shines as middleware in the agent loop — a fast, cheap "fuzzy if" that routes requests, gates risky tool calls, and prunes stale context. Here's where to get it and what the community has already built.
What the ecosystem uses Jev for
- Model routing — grade task complexity, send it to a cheap or frontier model.
- Tool-call guardrails — before an agent runs a command, score the risk and allow / confirm / block.
- Context compaction — decide which old tool results to keep, truncate or drop, verbatim, no lossy summary.
Build with Jev
You don't need any of the providers below to start — try Jev live here, or wire these jobs into your app with one API call.
Use them directly:
- Model Router →
/v1/model/route - Agent Risk →
/v1/agent/risk - Context Filter →
/v1/context/filter
Open-source ecosystem
Jev launched in September 2026 and the tooling around it moved fast — most of it aimed at plugging Jev into coding agents and harnesses.
awesome-jev
listCommunity-curated list of Jev projects, integrations and discussions — the best index of the ecosystem.
Open ↗LangChain integration
frameworklangchain-typesafe exposes TypeSafeClassifier (call .invoke() with state + typed questions) plus model-routing / auto-mode middleware for the agent loop.
Open ↗Jev context compaction
harnessInstead of summarizing, Jev decides keep / truncate / drop for each stale tool call so long agent transcripts shrink without a lossy rewrite. (See fast-jev-compaction and friends.)
Open ↗Jev model routers
routingDrop-in routers (e.g. pi-jev-router) that let Jev grade task complexity and send each request to a fast, balanced or frontier model.
Open ↗jev-mcp
mcpMCP server that gives any agent (Claude Code, Codex, Cursor…) Jev tools: classify, score, check, and gate risky tool calls. One npx line to install.
Open ↗Providers & gateways
Jev is available across several providers and gateways. Model IDs and endpoints differ per provider, so confirm the current ones on each.
Official (TypeSafe)
officialconsole.typesafe.aiSign in to the console and use your own API keys with the /v1/systemone endpoint.
Open ↗Vercel AI Gateway
gatewaytypesafe-ai/jevJev is listed on Vercel's AI Gateway — route to it with your gateway key alongside your other models.
Open ↗OpenRouter
gatewaytypesafe/jev-1.13 · typesafe/jev-latestReachable through OpenRouter's decisions endpoint (POST /api/alpha/decisions) — not the normal chat-completions path. Check current pricing on OpenRouter.
Open ↗Cloudflare AI Gateway
gatewaytypesafe/jevCloudflare's AI Gateway lists Jev too, so you can proxy and observe calls through your CF account.
Open ↗This is an independent roundup, not official. Links point to third-party projects and providers; verify current model IDs, endpoints and pricing on each provider's own site. For the source of truth see typesafe.ai.