Jev (TypeSafe)
45 articles in series
Fifteen articles on Jev, TypeSafe AI's System One decision model, and the open-source projects built on it — typed decisions vs free text, browser agents, difficulty routing, context compaction, code-review triage, MCP wiring, guardrails and real-time loops. Source-backed, with honest notes on what the authors measured and what nobody has independently retested.
Approval Gates: hermes-jev-approvals and jev-security-scan
One project replaces a prose approval reviewer with typed probabilities; the other screens Agent Skills and MCP configs before install. Both report real numbers, both call themselves early.
Creative Jev: jevmeter, jev-paint and a UI Generator
Three small projects push Jev outside its usual routing/gating role — scoring video transcripts, turning prompts into pixels, and composing UI from a fixed shadcn/ui component catalog.
jev-align and effect-agent: Typed Effects Meet Typed Decisions
jev-align tunes AI function definitions with Jev and human feedback via GEPA. effect-agent wires Jev into TypeScript's Effect framework. Two takes on 'typed.'
jev-as-quant, and What 517 Jev Projects Add Up To
A quant-research project that actually built its own model instead of using Jev — plus a look back at what 517 Jev projects, most of them tiny, tell us about the ecosystem.
jev-code and jev-dsh-decision: Decision Layers for Coding Agents
Two unrelated repos share the name jev-code; a third adds Jev-based recommendation to agent harnesses. What each does, and why matching names aren't matching projects.
jev-codex-plugin and jev-rust-review: More Editor Integrations
Two small plugins put Jev inside Codex and Claude Code review workflows — one for general decision consultation and failure triage, one narrowly for Rust.
jev-dataops, jevframe and jevql: Pipeline Tooling for Typed Decisions
A dataset-to-LoRA workbench, a pandas/Polars scoring library, and a plain-Postgres semantic query tool: three ways typed Jev judgments are entering data pipelines, with their stated limits.
jev-drone: Putting a Decision Model in the Flight Loop
A MuJoCo quadrotor simulation splits flight into three frequencies: 500Hz control, 50Hz safety, and ~2.5Hz tactical calls from Jev. It's sim-only, and the author says so plainly.
jev-experiments: A Well-Known Developer's Public Jev Notebook
Two repos share a name and a model. One is game demos testing Jev's reflexes; the other, from developer-educator Nader Dabit, is a pre-commit security scanner with real benchmark numbers.
Jev for Marketing: Social and SEO Tools Built on It
One project routes social-media research through Jev, and two unrelated tools named jev-seo audit pages against dozens of rules. What their evidence actually supports, and what it doesn't.
Jev Inside the Database: pg_typesafe and duckdb-jev
Two extensions push typed Jev judgments into SQL itself, for Postgres and DuckDB. Batching cuts one benchmark 27x — but both are pre-1.0 and send row data to an external API.
Jev-Moderation-Bot and the Edge-Safety Toolkit
Three projects put typed judgments at three different layers: a Discord bot, an nginx edge filter, and a coding-agent permission gate. What each one measures, and what it doesn't.