Zearch MCP server

Answers you can check, inside any MCP client.

@zearchcomputer/mcp connects Claude, Cursor, VS Code and other Model Context Protocol clients to Zearch. Ask a question and you get an answer whose every paragraph was checked against the source it cites, with the exact passage Zearch read. Or check text your own model wrote against sources you already have.

Status: early. The Zearch API is not open to everyone yet.

How an answer is made

flowchart LR
  Q([Question]) --> S[Search]
  S --> J1[Jev selects<br/>passages]
  J1 --> W[Writer drafts from<br/>those passages only]
  W --> J2[Jev checks<br/>each paragraph]
  J2 -->|supported| A([Cited answer])
  J2 -->|not supported| E([The source<br/>passage itself])

Jev is TypeSafe AI's evidence model. When a paragraph can't be supported it is cut, and when nothing survives you get the best source passage instead of a guess (answer_type: "excerpt").

Tools

Errors are never charged. A run that can only return a source passage costs half.

Progress. research streams its stages (Searching the web → Choosing the most relevant evidence → Checking each claim against its source) as MCP progress notifications, so clients that show progress show what Zearch is doing.

Answer view. In clients that support MCP Apps, research, getrun and verify render an inline card: the answer with citation chips, source cards with the excerpt Jev read, an Open button for each source, and follow-up suggestions. It follows the client's light or dark theme. Other clients get the same content as text. Set ZEARCHUI=0 to turn it off.

Resources. zearch://runs/{id} (a run as Markdown; your recent runs are listed), zearch://pricing.

Prompts. researchbrief (a cited brief from deep research), factcheck (find sources for a draft, then verify it), compare (a table with a citation in every cell).

Install

You need a Zearch API key (zklive…). Create one in the Zearch app under Account → API keys.

Claude Code

claude mcp add zearch --env ZEARCH_API_KEY=zk_live_your_key -- npx -y @zearchcomputer/mcp

Claude Desktop

In Settings → Developer → Edit config, add:

{
  "mcpServers": {
    "zearch": {
      "command": "npx",
      "args": ["-y", "@zearchcomputer/mcp"],
      "env": { "ZEARCH_API_KEY": "zk_live_your_key" }
    }
  }
}

Cursor

.cursor/mcp.json (project) or ~/.cursor/mcp.json (global): the same mcpServers block as Claude Desktop.

VS Code

.vscode/mcp.json, which prompts for the key instead of storing it:

Shortened. The full README is on GitHub.