Dev releases jev-route, a framework-agnostic tool router for agents built on TypeSafe's Jev decision model
Huzeyfe_dev · reddit · 2026-09-25
Developer Huzeyfedev open-sourced jev-route (v0.2.0), a lightweight Python library addressing the latency and cost of using large generative LLMs for every tool-call decision in agent loops.
Key points
- Built on TypeSafe's newly released "System One" decision model Jev (typesafe/jev-1.13), which returns typed Choice and Score primitives instead of generated text, making routing remarkably fast.
- The library is framework-agnostic and plugs in front of LangChain, CrewAI, or custom agent loops, classifying prompts and routing tool calls in milliseconds.
- Includes a confidence gate: when Jev's confidence falls below a threshold, it automatically falls back to the main LLM.
- Async-first with minimal dependencies (only httpx and pydantic), shipped with unit tests and examples.
It's a practical pattern for combining fast small-model decisions with big-model fallback to speed up and cheapen agent architectures.
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