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How to Use Jev in Claude: TypeSafe's Decision Model as a Connector

Connect TypeSafe Jev to claude.ai and Claude Desktop in minutes: Claude hands yes/no, classification and scoring to Jev and gets probabilities back.

HCBy HelpCode teamUpdated 3 min read Open-source on GitHub
Install Jev by TypeSafe on Cloud — free trialRead the step-by-step guide

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claude · Jev by TypeSafe
Use Jev to triage these four tickets: urgent or not, which team, and how frustrated the customer is.
AI
Callingjev_playbookjev_ask
Payouts failing for 3 days: urgent 0.88, billing, very frustrated. App crashes on every PDF upload (German): urgent 0.90, technical, very frustrated. Annual-plan discount: urgent 0.02, sales. Thanks for the webinar: urgent 0.01, no team needed. No answer fell in the unsure band; handle the crash and the payouts first.
jev_playbookjev_yes_nojev_classifyjev_ratejev_ask+ more
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    Open source · AGPL-3.0
  • Works with ChatGPT, Claude, Gemini
    Any MCP-compatible client

Real prompts that work after a 4-minute setup.

Drop these into Claude once the connector is installed. Tools listed below each prompt are auto-called by the agent.

“Use Jev to decide which of these emails need a reply today and show only the ones above 0.8.”
jev_yes_no
“Classify these tickets into billing, technical, sales or none with Jev and list the low-confidence ones.”
jev_classify
“Rate these five leads from 0 (no fit) to 3 (ideal) with Jev against our customer profile.”
jev_rate
“Ask Jev whether each pair of supplier records describes the same company.”
jev_ask

Skip the install. Get this working in under 2 minutes.

Start a free trial on cloud.anythingmcp.com, add the Jev by TypeSafe in one click, then point your AI client (Claude, ChatGPT, Copilot or Cursor) at the generated MCP endpoint. No Docker, no git clone, zero engineering experience required.

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Summary

Connect TypeSafe Jev to claude.ai and Claude Desktop in minutes: Claude hands yes/no, classification and scoring to Jev and gets probabilities back.

Try asking

Example prompts for Jev by TypeSafe

Click any prompt to copy it. Paste into Claude, ChatGPT, Cursor, Gemini, Copilot or OpenClaw to run it against this connector.

Jev by TypeSafe · live via MCP
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Claude is AI and can make mistakes. Please double-check responses.

Jev in Claude

Short answer: install the Jev connector on AnythingMCP with your TypeSafe API key, then add AnythingMCP to Claude as a custom connector (Customize → Connectors → Add custom connector, URL https://cloud.anythingmcp.com/mcp). From then on Claude can ask Jev whenever it needs a quick, measurable judgment: is this urgent, which category, how good a fit, and gets a probability back instead of guessing.

Claude is good at reasoning and writing; Jev is built for the narrow decisions in between. It answers yes/no, choice and score questions with calibrated probabilities in about 300 ms and at a fraction of the cost of a chat model. Claude decides what to ask and what to do with the answer.

Set it up

Step 1: Install Jev on AnythingMCP

  1. Create an API key at console.typesafe.ai.
  2. Create a workspace on AnythingMCP Cloud (7 days free) or use your self-hosted AnythingMCP.
  3. Open Connectors, find Jev by TypeSafe, click Install and paste the key into TYPESAFE_API_KEY.

Step 2: Add AnythingMCP to Claude

  1. In Claude, open Customize → Connectors.
  2. Click +, then Add custom connector.
  3. Enter a name, e.g. AnythingMCP, and the remote MCP server URL https://cloud.anythingmcp.com/mcp, then click Add.
  4. Click Connect and sign in to AnythingMCP (OAuth) to allow access.

Custom connectors are available on every Claude plan; on Free you can add one. On Team and Enterprise, an owner adds the connector for the organisation. The same connector shows up in the Claude desktop app.

Step 3: Ask Claude to use Jev

Start a new chat and mention Jev in the request, for example "use Jev to decide which of these tickets are urgent". Claude reads jev_playbook first and then calls the Jev tools on its own.

What happens when you ask

Say you paste ten customer emails and ask which need a reply today. Claude builds one yes/no question ("Does email ask for something that blocks the customer today?"), calls jev_yes_no or jev_ask for each email with the email text as evidence, and gets back a probability per email. It then sorts them, shows you the clear cases and names the ones between 0.15 and 0.85 as unsure, instead of pretending to be certain.

For a real run with four tickets, including one in German, see the Jev overview.

Prompts to try in Claude

  • "Use Jev to sort these support tickets into billing, technical, sales or none, and show the probabilities."
  • "Ask Jev which of these 15 job applications match the requirements below, and list only the ones above 0.8."
  • "Rate each of these product reviews from 0 (angry) to 3 (delighted) with Jev and summarise the angry ones."
  • "Before I send this reply, ask Jev whether it answers every question in the customer's email."
  • "Use Jev to check whether these two supplier records are the same company."

Good to know

  • Jev returns numbers, not explanations. Ask Claude to split a borderline case into smaller yes/no questions if you want to see why.
  • Claude and Jev both read your text: the evidence for each question is sent to TypeSafe as the question's state.
  • The TypeSafe key stays on the AnythingMCP server, encrypted. People on your team connect with their own login and never see it.

Question types, costs and every limit in detail: Jev MCP server overview.

FAQ

Does Jev work on the Claude Free plan? Yes. Free plans can add one custom connector, and AnythingMCP counts as one no matter how many connectors you install on it. Jev itself is billed by TypeSafe per input token.

Does it work in Claude Code too? Yes. Add the same server with claude mcp add --transport http anythingmcp https://cloud.anythingmcp.com/mcp --header "X-API-Key: <your MCP API key>".

Is Jev replacing Claude? No. Jev cannot write text. Claude keeps the conversation, the reasoning and the answer; Jev handles the yes/no, choice and score calls where a probability is more useful than a paragraph.

Which languages does Jev understand? English best. German and Italian tickets came back correct and confident in our tests; for other languages, watch the confidence values.

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