The useful mental model
Do not think “another chatbot.” Think fast probabilistic decision function inside code. Your agent or application owns the workflow; Jev answers narrow questions such as which route to take, which action to choose, whether a condition is true, or how strongly something should be scored.
Why this matters for agents
Agent systems repeatedly need small judgments between expensive generative steps: choose a tool, screen context, verify a claim, judge completion, route a task, or decide whether to escalate. Those are the patterns this site tracks.
Official primitives
TypeSafe’s workflow materials use three decision shapes: Noul for yes/no probability, Choice for one option from a defined set, and Score for ratings on a defined scale.
Jev operates as a specialized fast decision co-processor alongside frontier foundation models like OpenAI GPT-4o, Anthropic Claude 3.5 Sonnet, and Google Gemini. While foundation models handle creative synthesis and reasoning, Jev makes sub-50ms deterministic decisions—choosing tools, scoring context, routing models, and judging task completion.
Underlying Foundation Models & Architecture
The builds, coding agents, and workflows showcased across JevForAgents rely on industry-standard foundation models from mainstream frontier providers:
- OpenAI: GPT-4o, GPT-4 Turbo, and OpenAI Codex for generative code synthesis, complex reasoning, and automated safety screening via the OpenAI Moderation API.
- Anthropic: Claude 3.5 Sonnet and Claude Code for long-context tool invocation and multistep agent workflows.
- Google: Gemini 1.5 Pro and Gemini Flash for multimodal context processing and visual retrieval.
Within these multi-model agent pipelines, Jev operates as a specialized, deterministic decision and routing co-processor (sub-50ms) to select tools, gate outputs, and route execution to the appropriate mainstream foundation model.
Read the architecture, typed-output and fit guide →
Evidence policy
[OFFICIAL] — Published by TypeSafe AI or an official TypeSafe repository/site.
[FIRST-HAND TEST] — Tested directly by JevForAgents with method and conditions documented.
[COMMUNITY OBSERVED] — Observed in a public project, repository, demo, or author report.
[SECONDARY REPORT] — Reported by a third-party source that is not the original implementation.
[HYPOTHESIS] — A working interpretation or opportunity that still needs verification.
