Jev for Tool calling

408 curated Jev resources. Turn natural language into typed function calls and agent actions.

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Docs5
Repos & sites386
Videos3
Posts7
Articles5
Playgrounds2

All 408 Jev resources for Tool calling

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Showing 241–288 of 408 resources

An MCP server with two tools for agent memory: record writes facts into a per-project ledger as they happen, and recall scores each one against the task you are starting and hands back only what matters.

Jev Practices & Patterns#community#awesomejev#catalog-import

Community

Dharundp6/jev-carryforwardTypeScript

jev-organize

A Node CLI that reads a folder of Word, Excel, PowerPoint, PDF, email, CSV, HTML, code and text files, classifies each with Jev on OpenRouter, and writes a catalog, an INDEX.md and an offline report. Originals are never moved.

Jev Agents & MCP#community#awesomejev#catalog-import

Community

nexibeo/jev-organizeJavaScript

Cerebellum-2B

An open Apache-2.0 2B non-autoregressive decision model for agent action routing on a Qwen3.5-2B backbone: one forward pass over a candidate set with a pointer head and an escalation head, shipped as BF16, FP8 and INT8 weights.

Jev Demos & Experiments#community#awesomejev#catalog-import

Community

mkeco/Cerebellum-2BPython

jev-firewall

PreToolUse hook for Claude Code and Codex that puts a shell-aware rules engine and Jev in front of every tool call, returning allow, ask or block per command and logging the reason and latency behind each decision.

Jev Agents & MCP#community#awesomejev#catalog-import

Community

Koushik890/jev-firewallTypeScript

jev-harness-router

TypeScript router that spends one Jev call deciding how an agent turn should run — model tier, effort budget, which tools are on offer and which skill applies — then your own harness runs the turn on whatever provider it already talks to.

Jev Repos & SDKs#community#awesomejev#catalog-import

Community

JoacoMarc/jev-harness-routerTypeScript

jevskill

Agent Skill that sends large tool output and CI logs to Jev and hands your expensive model only the few lines that matter, shipped with a stdlib-only caller, a doctor command, and a plan mode that keeps open-ended work on your LLM.

Jev Agents & MCP#community#awesomejev#catalog-import

Community

lazniak/jevskillPython

jev-routing

Archived Go proxy that sat between a coding-agent CLI and the upstream API to rewrite tool schemas and history with Jev, kept for the negative result: tool steering cut tokens on one model and added 37% and 51% on two others.

Jev Agents & MCP#community#awesomejev#catalog-import

Community

nekowasabi/jev-routingGo

hunch

Browser agent that takes one Jev decision per action on top of agent-browser and only calls an LLM when confidence drops, escalating instead of guessing, with values, origins and irreversible clicks all guarded in code.

Jev Demos & Experiments#community#awesomejev#catalog-import

Community

HAR5HA-7663/hunchPython

jev-demo

A zero-build Node server and static page for trying Jev: send a state plus choice, score and noul questions and read back options, scores and calibrated probabilities, with a beta browser agent that drives a real browser through Playwright.

Jev Demos & Experiments#community#awesomejev#catalog-import

Community

PenglongHuang/jev-demoJavaScript

Footwork

A computer-use agent for the browser and for native macOS apps that puts a Jev guard in front of the driver: claimed completions are checked against observed state and the trajectory, irreversible actions pass a gate, and Jev can take the mechanical steps itself.

Jev Demos & Experiments#community#awesomejev#catalog-import

Community

Tom-R-Main/FootworkPython

WindowsJev

A Windows MCP server for Codex and Claude Code that runs bounded UI Automation tasks and durable multi-source research jobs, letting Jev choose only among actions deterministic code created, and returns a compact typed trace instead of a stream of screenshots.

Jev Demos & Experiments#community#awesomejev#catalog-import

Community

Teylersf/WindowsJevC#

athena-jev

OpenCode extension putting a Jev-backed judgment layer between a coding agent and its tools. Four controllers, AEGIS, METIS, NIKE and EPISTEMICS, emit GO, DELIBERATE, VERIFY or BLOCK, and a tool router predicts the smallest useful capability set. Observe mode is the default.

Jev Agents & MCP#community#awesomejev#catalog-import

Community

MartinesEmanuel/athena-jevTypeScript

jev-filter

jev-filter is a CLI that filters tool output before it reaches your agent and, since 0.3, drives web pages and desktop apps too. Jev picks the next operation and its target among controls the program enumerates itself; the program re-checks and executes, and irreversible steps stop for confirmation.

Jev Practices & Patterns#community#awesomejev#catalog-import

Community

apixly-ai/jev-filterPython

jev-zig-cli

jevx is a Zig terminal agent that keeps Codex for code generation and confines Jev, reached through OpenRouter, to bounded choice, noul and score decisions for routing, hazard checks, impact and verification. The Zig side, not the model, holds the permissions and the final control flow.

Jev Practices & Patterns#community#awesomejev#catalog-import

Community

SupratimSircar05/jev-zig-cliZig

jevXagent

jevXagent is a localhost proxy that sits in front of Claude Code, Codex, Kilo Code and Cline. It asks Jev to classify the prompt first, then injects that verdict into the agent's system context so the main model skips re-deriving the same classification.

Jev Agents & MCP#community#awesomejev#catalog-import

Community

j1s4nn/jevXagentPython

pi-agent-foreman

A Pi extension that catches the turn-ending "Continuing the run" reply and sends the agent back to it, gated on the latest user request actually containing a command to do work.

Jev Agents & MCP#community#jevbest#catalog-import

Community

alexshpunt/pi-agent-foremanTypeScript

progressgate

An npm package that supervises a running agent: one Jev systemOne call per check returns six semantic signals about recent steps, and a deterministic policy in your own code turns them into CONTINUE, WARN, REPLAN or HALT.

Jev Agents & MCP#community#jevbest#catalog-import

Community

AshutoshVJTI/progressgateTypeScript

typesafe-demo-mcp

A one-commit TypeScript MCP server that exposes three TypeSafe System One judgments — noul, choice and score — as agent tools, with src, tests, docs, scripts and a knip config. No README, zero stars, no topics.

Jev Agents & MCP#community#jevbest#catalog-import

Community

bestagentkits/typesafe-demo-mcpTypeScript

AskJev-MCP

MCP server built on TypeSafe's official JavaScript SDK. One `ask` call batches choice, noul and score questions over a single state and returns per-option probabilities plus a separate confidence value.

Jev Agents & MCP#community#jevbest#catalog-import

Community

cbruyndoncx/AskJev-MCPJavaScript

decide-mcp

Local stdio MCP server that lets an agent delegate a decision: send a decision, context and 2 to 64 choices, get back a recommended choice with per-choice percentages and an explicit statement of where those percentages came from.

Jev Agents & MCP#community#jevbest#catalog-import

Community

dakdevs/decide-mcpTypeScript

browser-use-olympics

A benchmark for browser-using agents hosted on Almond: one prompt, five timed events scored by the page, plus Almond-fastloop, a ~200-line Chrome DevTools loop where Jev picks one bounded action per tick.

Jev Demos & Experiments#community#jevbest#catalog-import

Community

eriestra/browser-use-olympicsHTML

hiep-paseo-plugin

Fifteen independent local plugins for the Paseo desktop app, two of which use Jev: an evaluator exposed to Codex and Claude agents over MCP, and an orchestrator that routes a task to one model profile and effort level.

Jev Integrations & Adapters#community#jevbest#catalog-import

Community

HiepPP/hiep-paseo-pluginTypeScript

JevGuard

Plugin for Claude Code and Codex CLI that turns project rules into typed Jev questions a lifecycle hook uses to block a tool call or a final response, instead of trusting the agent to remember them.

Jev Agents & MCP#community#jevbest#catalog-import

Community

Jhonnyr97/JevGuardTypeScript

pi-jev-code

A Pi extension that keeps your existing coding model as the only agent and adds Jev as a coprocessor for search reranking, a pre-edit semantic gate, and a diff review against the task's starting commit.

Jev Agents & MCP#community#jevbest#catalog-import

Community

KamilPostrozny/pi-jev-codeTypeScript

jev-playwright-mcp

An MCP stdio proxy in front of the official Playwright MCP server that triages page state, masks prompt injection, trims oversized page dumps by goal and risk-gates actions, exposing the same tools and schemas.

Jev Demos & Experiments#community#jevbest#catalog-import

Community

krw82/jev-playwright-mcpTypeScript

jev-browser

A browser MCP server where Jev picks the next page action from locally ranked candidates in roughly 300 ms without LLM tokens, deterministic state diffs verify the step, and the driving agent steps in only on escalation.

Jev Demos & Experiments#community#jevbest#catalog-import

Community

MahmoudAdelbghany/jev-browserJavaScript

jev-skillbench

Measures whether Jev can catch malicious agent skills on MalSkillBench, with a cascade arm that sends only the uncertain band to an LLM. Per-sample records, thresholds and calibration are all kept.

Jev Practices & Patterns#community#jevbest#catalog-import

Community

MohibShaikh/jev-skillbenchPython

harnessjudge

Paste a trace of an agent step, get one of four dispositions back: ok, retry, escalate or stop. Aimed at agent builders putting a supervision step around an agent loop, with the judging powered by TypeSafe Jev and a two-command setup.

Jev Demos & Experiments#community#jevbest#catalog-import

Community

ndolinschi/harnessjudgeTypeScript

mcpmatch

McpMatch takes a free-text user goal and matches it against a catalog of MCP servers or capabilities using TypeSafe Jev, with a two-stage path for large catalogs. Runs with npm i and npm run dev.

Jev Demos & Experiments#community#jevbest#catalog-import

Community

ndolinschi/mcpmatchTypeScript

spendbrake

SpendBrake turns a budget plus a plan into one of three calls — continue, downgrade_model or stop — and renders the cost against value as a dashboard, with the decision made by TypeSafe Jev.

Jev Demos & Experiments#community#jevbest#catalog-import

Community

ndolinschi/spendbrakeTypeScript

swarmrouter

SwarmRouter picks which agent or skill should handle a task and returns a confidence with the pick, drawn as a visual swarm map, with the choice made by TypeSafe Jev. Five handler types are named in the README.

Jev Demos & Experiments#community#jevbest#catalog-import

Community

ndolinschi/swarmrouterTypeScript

shade-arena-jev-monitor

A fork of the SHADE-Arena public split that evaluates TypeSafe Jev as a monitor for covert agent sabotage, against Gemini 2.5 Flash and Pro. Thirteen hand-built transcripts across three tasks, 353 tool calls, and a full LaTeX report.

Jev Practices & Patterns#community#jevbest#catalog-import

Community

nican2018/shade-arena-jev-monitorPython

jev-certify

jev-certify turns Jev's probabilities into a bounded claim: conformal risk control picks a routing threshold with a finite-sample guarantee on silently misrouted queries, and prediction-powered inference audits it with about 40 hand labels. Measured on 2,412 Jev 1.13 decisions over CLINC150.

Jev Practices & Patterns#community#jevbest#catalog-import

Community

nikkoxgonzales/jev-certifyPython

ps2-ai-agent

A Python pipeline that captures the PCSX2 window, injects virtual DualShock 2 input and draws a broadcast-style telemetry HUD, with TypeSafe Jev System One as one of three swappable decision engines behind a BaseAgent interface.

Jev Demos & Experiments#community#jevbest#catalog-import

Community

opaielsheikh/ps2-ai-agentPython

jev-compaction

Compacts Hermes transcripts by scoring every tool call with Jev: stale calls are dropped, stale results truncated, and protected tools such as write_file and patch are always kept. Nothing is ever summarised.

Jev Agents & MCP#community#jevbest#catalog-import

Community

picaye/jev-compactionJavaScript

jev-plugins

An index and Cursor marketplace for four JEV Labs routers: memory_select filters retrieved memories under a token budget, agent_route picks or abstains, model_route routes an LLM, and mcp_select picks MCP tools without executing them.

Jev Agents & MCP#community#jevbest#catalog-import

Community

Pinutss/jev-plugins

jev-builder-loop

A Grok skill where you write the questions and environment state, Jev returns typed probabilities, and the script mixes them with your priors into posteriors before you act. Ships a nine-case benchmark you can run without a key.

Jev Agents & MCP#community#jevbest#catalog-import

Community

rainbowpuffpuff/jev-builder-loopPython

agent-gate-loop

A GitHub Action that turns a labelled issue into a pull request, with a four-part gate before a human sees it: path and test guards, your own check commands, a read-only Claude reviewer, and Jev checking each finding plus whether the change does what the issue asked.

Jev Agents & MCP#community#jevbest#catalog-import

Community

Ripwords/agent-gate-loopTypeScript

JevArena

A Next.js spectator app where two independent Jev agents play Snake against each other, each spectator page running its own match. Jev is reached only through Vercel AI Gateway, and an empty key gives you a labelled demo-policy match instead.

Jev Demos & Experiments#community#jevbest#catalog-import

Community

rolki-png/JevArenaTypeScript

jev-trace-classifier

Study of whether a calibrated judgment primitive can tell agent-written wiki pages from human ones, using the collusion.wiki corpus, Jev's Noul against a local Qwen, and a threshold sweep that finds no separating cutoff.

Jev Practices & Patterns#community#jevbest#catalog-import

Community

sypherin/jev-trace-classifierPython

pi-typesafe

A Pi extension that runs four hazard checks before bash, write and edit and four diff-quality checks afterwards, sharing one System One request per phase and applying its own thresholds.

Jev Agents & MCP#community#jevbest#catalog-import

Community

twilwa/pi-typesafeTypeScript

siege

SIEGE puts a live support agent with seven real tools in front of 200 attackers; every proposed call passes a TypeSafe System One action gate, and a defender loop rewrites the gate from each breach it observes.

Jev Demos & Experiments#community#jevbest#catalog-import

Community

vnmoorthy/siegeTypeScript

zcode-jev

A provider-agnostic TypeScript judgment layer for coding agents, with gates from PRD intake through release, a pluggable judge backend and a decision log you can replay.

Jev Agents & MCP#community#jevbest#catalog-import

Community

Zahrannnn/zcode-jevTypeScript

agent-handoff-gate

An experimental specification and offline evaluation kit for delegated coding work: evidence schemas, a gate protocol for PASS and BLOCKED reports, and a Jev integration contract.

Jev Agents & MCP#community#jevbest#catalog-import

Community

zsoXi/agent-handoff-gatePython

jev-judge

Dependency-free Python 3 CLI that hands a JSON state plus 1 to 16 named Noul, Choice or Score questions to Jev and prints typed answers, usage and elapsed time without echoing the state back.

Jev Agents & MCP#community#awesomejev#catalog-import

Community

ohmyjiro/jev-judgePython

jev-reach

MCP server that layers a reach tool onto chrome-devtools-mcp: Jev picks each click and typed value so your agent states a goal once, then makes one devtools call at the destination.

Jev Demos & Experiments#community#awesomejev#catalog-import

Community

rashedInt32/jev-reachTypeScript

switchboard

Apache-2.0 router that runs inside Claude Code or Codex: Jev classifies the task, a local policy picks the model and reasoning effort, and the pair stays pinned for the whole conversation.

Jev Agents & MCP#community#awesomejev#catalog-import

Community

ruban-24/switchboardTypeScript

yardsort

GPL-3.0 desktop app for Linux, macOS and Windows that gives every coding-agent task its own git worktree and its own terminal, with live diffs and optional Jev review of changed files.

Jev Agents & MCP#community#awesomejev#catalog-import

Community

joaoh82/yardsortRust

Start here with Jev

Featured entries for tool calling.

Fast Jev Compaction

7.6k

A Claude Code plugin and npm library that replaces transcript summarization with Jev keep-or-drop judgments, deleting stale tool calls and results while kept text stays verbatim.

Jev Tools & CLIs#community#typescript#claude-code

Community

tamaratran/fast-jev-compactionTypeScript

jevQL

psql-shaped CLI and Go, TypeScript, and Python SDKs that let you write jev(), jev_prob, jev_choice, and jev_score in queries against vanilla PostgreSQL, judging the surviving rows with Jev in batches. No CREATE EXTENSION or superuser required.

Jev Tools & CLIs#community#go#postgres

Community

kylemclaren/jevqlGo

Related use cases

Use cases that overlap with Tool calling.

Jev articles

Original guides that go deeper on Jev tool calling.

All Jev articles

The Cost of a Decision: Token Pricing and the Break-Even Point

Oct 12, 2026

Jev bills input tokens and gives output away, and questions in one call run in parallel. Why the state is where the money is, and how to size a request before you ship it.

Jev Practices & Patterns#pricing#cost#api

Read article

Retrieval with Decisions: Filter, Rerank, and Verify

Oct 12, 2026

Retrieval is a sequence of bounded judgments. How a decision model slots into passage filtering, semantic find, reranking, and citation checks, and what stays in deterministic code.

Jev Cookbooks#retrieval#reranking#rag

Read article

Jev in Customer Support: Triage, Routing, and Escalation

Oct 12, 2026

Support is a long chain of small judgments over text. Triage category and urgency separately, route with a confidence gate, decompose hard tickets, and decide the action in code.

Jev Practices & Patterns#customer-support#routing#triage

Read article

Watch: Jev in action

Video walkthroughs and demos from the community.

YouTube: Sam Witteveen on System 1 thinking, then Choice, Score, and Noul demos, and chained actions.

YouTube: Nate Herk compares speed and cost against ordinary models, then builds an X feed classifier and a paper-trading prototype.

YouTube: Ray Amjad puts Jev inside an agentic coding loop and looks at what it costs to run.

Discussions about Jev

Threads from Reddit and Hacker News about building with Jev.

Hacker News: OpenAI's Luna Decisions API framed as a fast follow to TypeSafe's Jev wave.

matt_d6 pointsOpenAI Answers TypeSafe's Jev with a Decision API Built on LunaRead the thread on Hacker News

Hacker News: Nikola Balić on what made the Jev launch easy to try and easy to share.

nkko2 pointsWhat TypeSafe Got Right with the Jev LaunchRead the thread on Hacker News

Hacker News: Pointer to a DiffusionGemma plus vLLM tutorial for a Jev-shaped classifier.

1 pointHow to build a Jev-style classifier with DiffusionGemma and vLLMRead the thread on Hacker News

Hacker News: SafeDep Gryph plus Jev checks for compromised coding-agent behavior.

2 pointsDetecting Compromised AI Coding Agents with Jev and GryphRead the thread on Hacker News

From the Jev community

Posts from builders shipping with Jev right now.

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