Releases·Tool Release
I open-sourced CasaJev: a Jev agent loop that builds and reuses verified tools
A developer released CasaJev, an Apache-2.0 open-source local harness for TypeSafe's Jev that lets an agent build small tools when none fit a task, then register and reuse them on later tasks. In one example, building a tool took 29.29 s versus 2.07 s to reuse it. It is an early prototype with limited OS validation and the author is seeking contributors and feedback.
2 engagement1 sourceWed, Sep 23, 2026, 06:54 PM
AI Overview
- CasaJev, an Apache-2.0 prototype local harness for TypeSafe's Jev, registers versioned agent-built tools in isolated workers for reuse across tasks.
- Tool reuse cut build time from 29.29 s to 2.07 s; a six-task pilot showed 1.80 s Jev median versus 13.01 s (Sol) and 16.84 s (Terra).
- macOS is validated end to end; Windows and Linux validation remain pending, and author 8endit seeks contributors on verification and benchmarks.
Related
Products·building
CasaJev — AI agent builds, verifies, and reuses a library of its own tools
CasaJev is an open-source prototype where an LLM agent builds narrow tools for tasks, verifies and versions them, and reuses that library for similar future tasks instead of rebuilding from scratch. It targets developers experimenting with agent frameworks, and the author notes a key unsolved issue: tools can succeed yet return plausible wrong values, so independent result checks matter.
CasaJev is an open-source prototype where an LLM agent builds narrow tools for tasks, verifies and versions them, and reuses that library for similar future tasks instead of rebuilding from scratch. It targets developers experimenting with agent frameworks, and the author notes a key unsolved issue: tools can succeed yet return plausible wrong values, so independent result checks matter.
4 engagement1 sourceredditThu, Sep 24, 2026, 09:48 AM
Releases·Model Release
Amazon releases its own Jev clone as decision models flood the web
AWS released Strands Decider 2B, an open source decision model that sorts between pre-decided options with calibrated confidence scores instead of generating text, built on the Qen3.5-2B LLM torso. Distinguished engineer Marc Brooker built it after seeing TypeSafe's Jev, and it briefly topped the Jevbench ranking for its size class before Amazon released it via Strands Labs. The release lands the same week OpenAI announced a similar offering, amid a wave of decision-model clones following Jev's debut.
AWS released Strands Decider 2B, an open source decision model that sorts between pre-decided options with calibrated confidence scores instead of generating text, built on the Qen3.5-2B LLM torso. Distinguished engineer Marc Brooker built it after seeing TypeSafe's Jev, and it briefly topped the Jevbench ranking for its size class before Amazon released it via Strands Labs. The release lands the same week OpenAI announced a similar offering, amid a wave of decision-model clones following Jev's debut.
101 engagement2 sourcesrss, githubThu, Oct 1, 2026, 04:49 PM
Releases·Tool Release
Jeview: unofficial local visualizer for Jev (TypeSafe) proxies calls via 127.0.0.1:4777, logs to SQLite, maps live
An independent developer published Jeview on GitHub, a local proxy-visualizer for TypeSafe's Jev (System One) that logs every call to SQLite and draws them on a live map. It runs as a gateway between user code and api.typesafe.ai, needs only Node 24+, and has zero dependencies. It is not affiliated with or endorsed by TypeSafe AI.
An independent developer published Jeview on GitHub, a local proxy-visualizer for TypeSafe's Jev (System One) that logs every call to SQLite and draws them on a live map. It runs as a gateway between user code and api.typesafe.ai, needs only Node 24+, and has zero dependencies. It is not affiliated with or endorsed by TypeSafe AI.
57 engagement1 sourcegithubMon, Sep 21, 2026, 02:03 PM
Releases·Tool Release
Mellow Machines Lab open-sources Mellow Harness, an agent harness for Jev-based AI hardware with 227 ms median decision latency
Mellow Machines Lab, a small open-source team, released Mellow Harness, an agent harness for building configurable, interactive AI hardware and companions. A System One Model called Jev sits at the center of the harness loop, producing fast expressive feedback via mood graphs, authored personality, and a shared event log. The team also shipped Buddygotchi, a pixel-animated coding companion demonstrating the harness.
Mellow Machines Lab, a small open-source team, released Mellow Harness, an agent harness for building configurable, interactive AI hardware and companions. A System One Model called Jev sits at the center of the harness loop, producing fast expressive feedback via mood graphs, authored personality, and a shared event log. The team also shipped Buddygotchi, a pixel-animated coding companion demonstrating the harness.
1 engagement1 sourceredditFri, Oct 9, 2026, 03:33 PM
Developments·Benchmark
How well do 5 decision models categorize finance data? Jev beats Span-01 on 1000 real transactions
A developer ran five decision models (Jev, D1, Solar Decide, Kev 4b, Span-01) against 1000 real financial transactions, three passes each, testing categorization accuracy. Vague restaurant names caused models to abstain; Span-01, which cannot abstain and only answers yes/no, scored lowest. Results were shared alongside a tool, system-one-connector, that connects decision models to Claude Code, Codex, and Pi.
A developer ran five decision models (Jev, D1, Solar Decide, Kev 4b, Span-01) against 1000 real financial transactions, three passes each, testing categorization accuracy. Vague restaurant names caused models to abstain; Span-01, which cannot abstain and only answers yes/no, scored lowest. Results were shared alongside a tool, system-one-connector, that connects decision models to Claude Code, Codex, and Pi.
1 engagement1 sourceredditFri, Oct 2, 2026, 06:05 PM