Arc MCP Server

ARC: Agentic Report Card

ARC is the free, neutral record of which online stores AI agents can actually reach checkout at, with dated evidence.

Website: https://www.arcreport.ai

This repo holds ARC's public MCP connector metadata and setup instructions. ARC is a hosted service, so there is nothing to install or run.

Quick start: precheck (free, no sign-in, CC BY 4.0)

Before your agent tries a store, ask ARC whether agents can reach checkout there:

curl "https://www.arcreport.ai/api/precheck?url=https://allbirds.com"

Real response (trimmed, 14 Oct 2026):

{"host":"allbirds.com","known":true,"reachable_checkout":true,
 "rails":[{"name":"UCP","status":"valid"},{"name":"ACP","status":"not_found"},
          {"name":"MCP","status":"yes"},{"name":"Checkout WebMCP","status":"detected"}],
 "blockers":[],"confidence":"high","last_checked":"2026-10-13T09:47:13.000Z",
 "stale":true,"source":"ARC (arcreport.ai)","licence":"CC BY 4.0"}

reachable_checkout is based on ARC's last saved check. It does not mean an agent completed checkout. Check last_checked and stale before relying on it. Contact: arcreport@mail.grokbot.com (ARC).

Advisory only, not a guarantee. Missing data or known:false is not a no.

Endpoints

Both use the Streamable HTTP transport and are listed in the official MCP Registry. Reading saved checks (check_store, find_stores) and reporting a checkout attempt (report_checkout) need no sign-in.

Other ways in

• A2A agent card: https://www.arcreport.ai/.well-known/agent-card.json
• OpenAPI spec: https://www.arcreport.ai/openapi.json
• llms.txt: https://www.arcreport.ai/llms.txt
• ARC data CC BY 4.0; OSM-derived rows ODbL: https://www.arcreport.ai/data
• Agent Outcome Report spec (tell ARC what happened when your agent tried to reach checkout): https://www.arcreport.ai/docs/outcome-report

Setup

Claude Code

claude mcp add --transport http arc https://www.arcreport.ai/api/mcp

Claude Desktop / claude.ai

Settings → Connectors → Add custom connector → URL https://www.arcreport.ai/api/mcp.

ChatGPT

Settings → Apps & Connectors → Advanced → Developer mode → Create connector → URL https://www.arcreport.ai/api/mcp.

Cursor (~/.cursor/mcp.json)

{ "mcpServers": { "arc": { "url": "https://www.arcreport.ai/api/mcp" } } }

VS Code (.vscode/mcp.json)

{ "servers": { "arc": { "type": "http", "url": "https://www.arcreport.ai/api/mcp" } } }

Cline (cline_mcp_settings.json)

{ "mcpServers": { "arc": { "type": "streamableHttp", "url": "https://www.arcreport.ai/api/mcp" } } }

Swap in https://www.arcreport.ai/api/ask to use the Ask connector.

Files

• server.json: registry entry for ai.arcreport/mcp (copies of both entries in server.mcp.json and server.ask.json)
• glama.json: Glama directory metadata

How ARC reports results

Every result is dated and labelled by source: agent-reported, ARC-tested up to payment, or verified purchase. A missing result never counts against a store.

License

Repo contents: MIT. ARC data: CC-BY-4.0.