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What you can do with Jev Chat

A tool-calling chat bar that runs real MCP tools for weather, units, Wikipedia, recipes, search, tasks and smart home, with no LLM writing the replies.

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w3cj/jev-chat on GitHub

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What do you want to do?

4 use cases

  • Ask weather, unit and recipe questions without an LLM

    Run the chat bar locally and get weather, unit conversions and recipes from tools, not model text.

    View prompt
    In the jev-chat repo, copy .env.example to .env, set TYPESAFE_API_KEY to <typesafe-key>, and run pnpm dev. Send the message "350F in celsius" to the chat at http://localhost:5173 and report the reply. Verify that the reply value came from the units tool and not from model text.

  • Add Todoist reminders and control Home Assistant by chat

    Connect Todoist and Home Assistant so one chat bar can add reminders and switch devices.

    View prompt
    In the jev-chat repo, set TYPESAFE_API_KEY, TODOIST_API_KEY, HASS_URL and HASS_TOKEN in .env to values from <your-accounts>, then run pnpm tools:list. Expected output is the tools each connected server exposes. Verify that the Home Assistant server is listed before sending a light command.

  • Answer factual questions from Wikipedia and web search

    Get sourced facts from Wikipedia and Brave Search, with no model writing the answer.

    View prompt
    In the jev-chat repo, run pnpm dev with TYPESAFE_API_KEY set in .env, then send "How tall is Mount Rainier?" to the chat at http://localhost:5173. Report the reply and the tool named in the inspector. Verify that the height value appears in the tool result shown in the inspector.

  • Trace why the chat bar picked a tool

    Use the inspector to read every classifier answer and probability behind a reply.

    View prompt
    In the jev-chat repo, run pnpm dev, send the message <test-message> to the chat at http://localhost:5173, and open the inspector for the reply. Report the tool choice probabilities and the policy action. Verify that the inspector shows the original message and the answer to each question.

How to use Jev Chat

  1. Check you have what it needs: Node 24 or later and pnpm 11 (run corepack enable to pick up the pinned version); A TypeSafe API key in TYPESAFE_API_KEY, since Jev is a paid API and the app shows error replies without it; A terminal and a local browser on the same machine, because the API only listens on 127.0.0.1.
  2. Open w3cj/jev-chat on GitHub and read the README and license.
  3. Run corepack enable to pick up the pinned pnpm version.
  4. Run pnpm install in the repo folder.
  5. Run cp .env.example .env and set TYPESAFE_API_KEY in the new file.
  6. Run pnpm dev, then open http://localhost:5173 in a browser on the same machine.

These steps come from our top use case, Ask weather, unit and recipe questions without an LLM, which also has a copy-paste agent prompt.

Jev Chat alternatives · Best AI repos for Personal productivity

About this repo

Requirements

  • Node 24 or later and pnpm 11 (run corepack enable to pick up the pinned version)
  • A TypeSafe API key in TYPESAFE_API_KEY, since Jev is a paid API and the app shows error replies without it
  • A terminal and a local browser on the same machine, because the API only listens on 127.0.0.1
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Questions about Jev Chat

What is Jev Chat?

A tool-calling chat bar that runs real MCP tools for weather, units, Wikipedia, recipes, search, tasks and smart home, with no LLM writing the replies. It is an open-source project on GitHub: https://github.com/w3cj/jev-chat.

Who is Jev Chat for?

Developers and curious users who want tool answers from a chat bar without a chatbot inventing facts.

What can I do with Jev Chat?

4 use cases so far, for example: Ask weather, unit and recipe questions without an LLM; Add Todoist reminders and control Home Assistant by chat; Answer factual questions from Wikipedia and web search. Each has steps and a copy-paste agent prompt.

What do I need to run Jev Chat?

Node 24 or later and pnpm 11 (run corepack enable to pick up the pinned version); A TypeSafe API key in TYPESAFE_API_KEY, since Jev is a paid API and the app shows error replies without it; A terminal and a local browser on the same machine, because the API only listens on 127.0.0.1.

What are alternatives to Jev Chat?

Other hot AI repos in Personal productivity: Abacusai Bot, Unigit Ecosystem, Comma, Agent Peer Chat, Compass.

Is Jev Chat safe to run?

Deduped does not own, audit or vouch for it. Read the README and license, run it on your own systems first and review every command before you run it.