B4 Pro

Connect B4 to your AI

You bring the AI. B4 brings the judgment. Connect the MCP and your agents query the verdict, the scorecard, and the vendor field directly — always the current call, never a stale export.

1 · Get your key

Mint an API key in your cockpit. It's shown once — copy it somewhere safe.

Open cockpit → API keys

2 · Add the server

Pick your client. Paste the block, swap in your key.

Claude Code

claude mcp add --transport http b4-index https://b4-index.vercel.app/mcp \
  --header "Authorization: Bearer b4_YOUR_KEY"

Run in your terminal. Replace b4_YOUR_KEY with your key.

Claude Desktop

{
  "mcpServers": {
    "b4-index": {
      "type": "http",
      "url": "https://b4-index.vercel.app/mcp",
      "headers": { "Authorization": "Bearer b4_YOUR_KEY" }
    }
  }
}

Settings → Developer → Edit Config, then restart Claude Desktop.

Cursor

{
  "mcpServers": {
    "b4-index": {
      "url": "https://b4-index.vercel.app/mcp",
      "headers": { "Authorization": "Bearer b4_YOUR_KEY" }
    }
  }
}

Add to .cursor/mcp.json (project) or ~/.cursor/mcp.json (global).

Or connect with one click (OAuth)

In Claude.ai or Claude Desktop, add https://b4-index.vercel.app/mcp as a custom connector and press Connect. Sign in with the same account as your B4 subscription — no key to paste, and access follows your plan automatically.

What your agent gets

Five tools, all included with B4 Pro. The MCP is a Pro feature — a key or OAuth-signed Pro session is required for every call.

b4_browse Search and filter the 1,600+ categories by keyword, domain, quadrant, or industry.
b4_score The full five-dimension scorecard + verdict for a category.
b4_audit Audit a whole stack — quadrant distribution + BEWARE/overspend flags.
b4_compare Compare categories head-to-head on scores and trajectory.
b4_recommend Build/Buy/Bridge/Beware recommendation for a need or stack.