priorrun-mcp 0.1.1

Run Prior.Run audience simulations from Claude Desktop, Claude Code, Cursor, or any MCP-compatible agent.

priorrun-mcp

MCP server for Prior.Run — run synthetic-audience simulations on design variants and ad creatives from Claude Desktop, Claude Code, Cursor, or any MCP-compatible agent.

Install

Requires Python 3.11+. Install uv if you don't have it.

uvx priorrun-mcp

That's it — uvx fetches and runs the server on demand.

Configure

Grab an API key from prior.run/settings, then register the server with your agent host.

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "prior-run": {
      "command": "uvx",
      "args": ["priorrun-mcp"],
      "env": {
        "PRIORRUN_API_KEY": "pr_live_xxxxxxxxxxxxxxxxxxxxxxxx"
      }
    }
  }
}

Claude Code / Cursor

~/.claude/mcp.json (Claude Code) or .cursor/mcp.json (Cursor):

{
  "mcpServers": {
    "prior-run": {
      "command": "uvx",
      "args": ["priorrun-mcp"],
      "env": { "PRIORRUN_API_KEY": "pr_live_..." }
    }
  }
}

Tools

Tool	What it does
create_memo_review	single design review
create_memo_compare	two design variants head-to-head
create_memo_multi	3–5 design variants
create_memo_flow	two funnel flows (each 2–5 screens)
create_ads_single	single ad creative evaluation
create_ads_compare	two ad creatives head-to-head
create_ads_multi	3–5 ad creatives
get_memo	fetch status + full memo JSON by id
wait_for_memo	block until synthesis completes

Image arguments accept local file paths, https:// URLs, or base64. Create tools default to wait=True — the agent gets the completed memo in one tool call.

Example prompt

Run a Prior.Run compare on ~/desktop/landing-a.png vs ~/desktop/landing-b.png
for a Gen Z skincare awareness campaign. Hypothesis: the warmer palette
will lift click-through.

The agent calls create_memo_compare, waits ~90s for synthesis, and hands you back the verdict, audience quotes, and memo URL.

Environment variables

Variable	Required	Default	Notes
PRIORRUN_API_KEY	yes	—	pr_live_... format. Generate at prior.run/settings.
PRIORRUN_API_BASE	no	https://api.prior.run	Override for staging or local dev.

Links

• Product: prior.run
• API docs: prior.run/docs/api
• MCP docs: prior.run/docs/mcp