Begin a GUEST checkout flow for one or more products — NO sign-in required. Pass shop_domain (e.g. "allbirds.com") on Curie's cross-merchant route so Curie resolves the shop, creates an UNAUTHENTICATED Shopify cart, and returns its continue_url — the shop's OWN Shopify-hosted guest checkout where...
Risk signalsBulk/mass operation — affects multiple targets
Part of the Curie Commerce server.
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AI agents use initiate_checkout to create or modify resources in Curie Commerce. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call initiate_checkout repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Curie Commerce.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"initiate_checkout": {
"limits": [
{
"counter": "initiate_checkout_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Curie Commerce policy for all 29 tools.
These attack patterns abuse exactly the kind of access initiate_checkout gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Begin a GUEST checkout flow for one or more products — NO sign-in required. Pass shop_domain (e.g. "allbirds.com") on Curie's cross-merchant route so Curie resolves the shop, creates an UNAUTHENTICATED Shopify cart, and returns its continue_url — the shop's OWN Shopify-hosted guest checkout where the buyer completes payment securely (Curie never charges or stores card data). On a shop-scoped connector the storeId already names the shop, so shop_domain is optional. product_ids accept the SAME identifiers search_catalog / get_product return (Shopify Product GIDs gid://shopify/Product/..., product URLs, or Curie UUIDs). Returns a checkout UIResource + cascade media (3D / 360° / image) for every line item.. It is categorised as a Write tool in the Curie Commerce MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Curie Commerce MCP server in PolicyLayer and add a rule for initiate_checkout: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Curie Commerce. Nothing to install.
initiate_checkout is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the initiate_checkout rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for initiate_checkout. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
initiate_checkout is provided by the Curie Commerce MCP server (https://chat.curie.app/api/mcp/global). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 29 Curie Commerce tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.