generated: '2026-09-16'
method: searched
source: https://underdog.shop/agents.md
note: >-
  Underdog tells agents its MCP endpoint is rate-limited per IP but publishes no numbers.
  No X-RateLimit-* / RateLimit-* / Retry-After headers appeared on any successful probe on
  2026-09-16. The only runtime cost signals are GraphQL extensions.cost.requestedQueryCost
  and the shopify-complexity-score headers on MCP responses. An agent learns the limit only
  by receiving a 429.
limit_count: 0
rate_limits: []
documented_policy:
  scope: per-IP
  surface: https://underdog.shop/api/ucp/mcp
  statement: '"Respect rate limits. The MCP endpoint is rate-limited per IP. Back off on 429 responses."'
  status_on_exhaustion: 429
  headers_documented: []
  headers_observed: []
  retry_after_observed: false
  observed_headers_on_success: [x-request-id, server-timing, shopify-complexity-score, shopify-complexity-score-v2, x-shopify-ucp-mcp-api-version]
evidence:
- url: https://underdog.shop/agents.md
  status: 200
- url: https://underdog.shop/api/ucp/mcp
  status: 200
  note: POST initialize; response headers inspected
- url: https://underdog.shop/products.json
  status: 200