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langgraph-jev-router

JTankariya/langgraph-jev-router

Jev decides confident routes; your LLM router handles the rest.

Automated README summary

Automatically summarized from the README on 11 Oct 2026; not a run by jevbooks. Run instructions and author-reported outcomes still need verification.

What it is

A LangGraph conditional edge that uses TypeSafe AI's Jev model for fast, schema-safe routing between specialized agents. For developers who want sub-500ms routing without replacing their existing LLM router.

How it uses Jev

Jev answers which route to take from the newest user message and route descriptions. If confident, it returns the route directly; if unsure, unavailable, or mid-conversation, your existing router runs. Used via @jev_first decorator or install_shortcut.

Primitives:choice

Technique worth stealing

Shadow mode: run Jev alongside your router, compare decisions, then go live once agreement is high.

Try it

pip install -e ".[dev]"; pytest; python examples/01_quickstart.py

View on GitHub

Start using Jev: API key and your first request →

Model judgments from README excerpts

Project signals use repository metadata, an existing summary and the first 700 README characters, not the full project. “Not found” means not detected in that material; it does not establish absence. These are the original judgments with recorded models and dates, not source audits or run results.

Models & evaluation dates

Inclusion gate
jev-1.13.0
Project signals
jev-1.13.0
Category
jev-1.13.0
Pattern tags
jev-1.13.0

Evidence

These signals use repository metadata, an existing summary and at most 700 cleaned README characters. ≥ 0.60 means reported in that excerpt; ≤ 0.40 means not found there. The middle band is inconclusive. None is a source-code audit or a test result. The runnable-tool question excludes research experiments; the recommendation question asks for a learning shortlist, not a quality verdict.

  • Jev is core to the projectFound in material0.70
  • Shows a System One patternFound in material0.80
  • Describes handling uncertaintyFound in material0.89
  • Reports measured numbersnot found in the excerpt0.12
  • Is a runnable toolFound in material0.92
  • Top-10 learning shortlist signalunclear0.45
  • Is a replica of the modelnot found in the excerpt0.04
  • Solves a common problem (0–2)score on a 0–2 scale1.14 / 2
  • About JevFound in material0.98
Signals
Jev is core to the project0.70Shows a System One pattern0.80Describes handling uncertainty0.89Reports measured numbers0.12Is a runnable tool0.92Top-10 learning shortlist signal0.45Is a replica of the model0.0400.51Solves a common problem (0–2)1.14 / 2012

no-judgment band (0.40–0.60)

Design patterns
Viewfinder0.93Flight recorder0.93Fail open, fail closed0.84Ghostwriter0.64Funnel0.59Check-up0.58Traffic light0.44Grey zone0.2900.51

no-judgment band (0.40–0.60)

The Jev model and date for each judgment stage are listed above. Card written by DeepSeek V4.1 Flash from the README on 11 Oct 2026.