Jev + Claude guide

JevRouter is a local-first agent capability router for models, subagents, skills, MCP tools, CLIs, and DSH plugins. It presents these capabilities as one candidate set and uses Jev for typed selection while enforcing availability, permissions, risk, and confirmation policies. It is decision-only by default and does not execute selected tools implicitly. The `route` operation answers one capability-selection question; `plan` selects capabilities for multiple steps using serial, batch, or decomposed strategies, with optional beam sequence search and contextual routing. Candidates can be supplied inline or discovered from Skill directories, MCP configurations, CLI help output, and DSH manifests. The router preserves Jev probabilities and provider responses, validates supplied permissions and input schemas, filters unavailable or disallowed candidates, and can select a safe fallback while retaining the original Jev choice. The CLI, Node.js SDK, HTTP server, and MCP adapter expose the routing contract. Decisions and plans are written as append-only receipts with provenance hashes, and a local dashboard reads those files without making provider requests or uploading data. It supports the official Jev API and OpenRouter, has an offline demo provider, requires Node.js 20 or later, and is distributed under the MIT license.

Jevgrep is a command-line tool for coding agents that finds relevant files and source context in unfamiliar repositories from natural-language questions. It uses Jev to judge relevance across folders, files, and declarations, explores qualifying branches of the repository hierarchy, selects files through content previews, identifies useful source units and surrounding context, and returns a summary followed by file locations, reading leads, and verbatim excerpts with line references. Python and TypeScript/JavaScript support declaration parsing, while other text uses a fallback. It also includes an agent skill that teaches supported coding agents when to invoke the CLI and how to use its results. The CLI is distributed through npm as @dzhng/jevgrep, requires Node.js 22 or later on macOS or Linux, and requires authentication with a supported AI provider. Searches send eligible source content to Jev through the selected provider; local filtering excludes ignored, hidden, dependency/build, binary, and obvious credential files but is not a guarantee that sensitive data is removed. The project is MIT-licensed.

Simple Jev is an open-model classifier and scoring server from Featherless AI. It accepts shared context or chat messages plus questions, then reads the model's next-token logits for predefined answer labels instead of generating a prose or JSON completion. The server constructs JSON responses for choice classification, ordered rubric scores, and truth or support judgments, including confidence and label distributions. Its Hugging Face Transformers implementation identifies the exact common token prefix across questions, evaluates that prefix once, reuses its KV cache for question-specific suffixes, and batches the suffixes before scoring the allowed answer tokens. The response-scoring code normalizes the selected logits; shared context is counted once for usage purposes, and no output tokens are generated. The API provides non-streaming /v1/classifier and /v1/systemone endpoints, with local execution supported through Python, PyTorch, and Transformers. A public demo API is available, while production deployments can use Featherless paid plans or run the server themselves. The repository also includes RFDT, which fine-tunes models directly on allowed answer-token logits using the same prompt structure.

Mobile Jev is a standalone Android agent from droidrun that turns a written goal into device actions through the Mobilerun API, using TypeSafe's Jev to choose operations such as opening apps, tapping, entering text, scrolling, navigating, waiting, completing, or blocking. It observes the device, offers indexed controls and installed apps to Jev, validates the selected target against fresh screen data, executes the action, and observes the device again; it does not require an ADB connection. The executor resolves coordinates from observed bounds, rejects stale targets, records actions and execution traces, and verifies field values after text entry rather than relying solely on a model completion response. The project includes a local React studio with a live device stream, goal input, action timeline, task clock, model-latency measurements, stop and reconnect controls, and recent runs, along with a CLI for previewing or executing goals, inspecting devices, taking screenshots, profiling API timings, and issuing direct controls. It requires Node.js, pnpm, a Mobilerun Android device, and Mobilerun and TypeSafe API keys; it is intended for a single local operator, with recent runs held in memory. The repository is MIT licensed.

jeff is a self-hosted, MIT-licensed drop-in implementation of TypeSafe's jev System One API, powered by the GLiFormer encoder model. It accepts classification questions through a compatible SDK or the POST /v1/systemone endpoint and returns choice selections, ordered scores, and noul yes/no probabilities. The server supports CUDA, Apple MPS, CPU, and ONNX Runtime deployments, with batching, bearer-key authentication, rate limits, request limits, health and statistics endpoints, and deployment configurations for Modal. Its repository reports lower hosting costs than jev but weaker results on reasoning-heavy tasks.