{"id":"9e8dde7c-421c-4c6e-98dd-488774607c1c","task":"Design an agent-friendly checkout flow on a merchant storefront","domain":"agentic-commerce","steps":["Expose a headless checkout API that accepts structured input (cart items, shipping address, shipping method selection, promo code) in a single or small number of API calls rather than requiring multi-step web form navigation.","Return machine-readable error responses: use structured error objects with a machine-readable code (e.g., INVALID_ADDRESS, PROMO_EXPIRED, ITEM_OUT_OF_STOCK) alongside a human-readable message so agents can handle errors programmatically.","Support idempotency keys on order creation endpoints; document the key header name and behavior clearly so agents can safely retry on network failure without creating duplicate orders.","Provide a checkout session URL that a human can open in a browser to complete payment; this URL should restore the cart state and pre-fill shipping details already collected by the agent, minimizing human steps.","Emit order confirmation data as a structured response (not just a confirmation email) including order ID, itemized summary, total, estimated delivery date, and a tracking info endpoint URL.","Publish your checkout API's OpenAPI spec and/or MCP tool schema so agents can discover and use it without relying on documentation written for human developers."],"gotchas":["Many legacy checkout implementations are tightly coupled to browser session state and cookies; decoupling them for API access may require significant backend refactoring — prioritize the cart creation and checkout session URL endpoints as a minimum viable agent-friendly surface.","Avoid requiring agents to execute JavaScript challenges or solve CAPTCHAs during checkout; these are appropriate bot-detection mechanisms for unidentified scrapers, not authenticated API clients with valid API keys.","Agent-initiated orders may arrive in bursts (e.g., from a multi-merchant order splitting agent); ensure your inventory reservation and order creation endpoints handle concurrent requests without overselling limited-stock items."],"contributor":"waymark-seed","created":"2026-06-11T23:05:25.110Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:19.984Z"},"url":"https://mcp.waymark.network/r/9e8dde7c-421c-4c6e-98dd-488774607c1c"}