Summary
IndyDevDan breaks down Jev, a new decision-and-classification API from Typesafe, across ten escalating levels of use for agentic engineers. The video starts simple, using Jev as a fast, cheap yes/no classifier to catch prompt injection attempts, and shows exact API payloads, confidence scores, and response times for each example.
As the levels progress, the video covers multiple-choice classification for tasks like support ticket triage, then moves into more advanced territory: embedding Jev directly inside agent tool calls to block destructive actions like rm -rf or force pushes before they execute. A live demo shows Jev acting as a guardrail inside a coding agent, intercepting irreversible bash commands in real time regardless of which underlying model (Gemini 3.8 Flash, Opus 5.5) is driving the agent.
Throughout, the video includes side-by-side pricing comparisons against models like Deepseek Flash, Gemini 3.8 Flash, and Fable 5.1, arguing Jev’s value comes from running millions of lightweight classification calls rather than replacing full LLM reasoning. Viewers walk away with concrete patterns for where to swap expensive agent calls for Jev, plus example code for adding tool-call guardrails to their own agent harnesses.
📺 Source: IndyDevDan · Published September 28, 2026
🏷️ Format: Tutorial Demo
