Wren MCP Server

Sourced pediatric guidance for parents, designed by a practicing pediatrician. One read-only tool over the Model Context Protocol.

Endpoint

POST https://mcp.wren.kids/mcp

Streamable HTTP transport. No authentication. One JSON-RPC message per request. The server never initiates an event stream, so GET is declined.

Tool

{
  "name": "ask_wren_pediatric_question",
  "title": "Ask Wren a pediatric question",
  "description": "Answer a parent-facing question about a child’s health, symptoms, development, or parenting with sourced, physician-designed pediatric guidance. Use for any child health or parenting question. Returns the answer plus the curated sources it relied on. Does not diagnose, and is not for adult health questions.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "question": {
        "type": "string",
        "description": "The parent's question, in their own words."
      }
    },
    "required": [
      "question"
    ]
  },
  "annotations": {
    "readOnlyHint": true,
    "destructiveHint": false,
    "idempotentHint": true,
    "openWorldHint": true
  }
}

Example

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "ask_wren_pediatric_question",
    "arguments": {
      "question": "My 2 year old has had a fever of 102 for two days."
    }
  }
}

The result returns the answer as text content, plus structuredContent carrying the answer and the curated sources it relied on, each with a title, publishing organization, and URL.

What it does

• Answers child health, symptom, development, and parenting questions for parents.
• Grounds answers in a curated clinical guidance engine and a reviewed parent article library.
• Returns only the sources the answer actually relied on, rather than everything retrieved.

Scope and limits

• Stateless. No account, no stored child profile, no conversation history. Each call stands alone.
• No health records. This endpoint neither requests nor stores personal health information. Do not send identifying details about a child.
• Not a diagnosis. Wren is an AI health companion, not a clinician, and does not establish a care relationship.
• Pediatric only. Adult health questions are redirected, and emergencies are routed to emergency care.
• Rate limited per client. Sustained automated use should be arranged in advance.

About

Wren was founded and clinically designed by Dr. Michael Hobbs, a practicing pediatrician, and is built to reduce the waiting, worry, and mental load parents carry between visits.