Purchase pipeline check credits. Returns a Stripe Checkout URL that the user must open in a browser to complete payment. The AI cannot complete the payment. Tell the user to open the URL in their browser, complete the Stripe checkout, and then confirm they've paid. Credits are added to the accoun...
Part of the Unphurl server.
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AI agents call purchase to retrieve information from Unphurl without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though purchase only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"purchase": {}
}
}See the full Unphurl policy for all 16 tools.
These attack patterns abuse exactly the kind of access purchase gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Purchase pipeline check credits. Returns a Stripe Checkout URL that the user must open in a browser to complete payment. The AI cannot complete the payment. Tell the user to open the URL in their browser, complete the Stripe checkout, and then confirm they've paid. Credits are added to the account automatically once Stripe confirms payment. After purchase, use get_balance to verify credits have been added.. It is categorised as a Read tool in the Unphurl MCP Server, which means it retrieves data without modifying state.
Register the Unphurl MCP server in PolicyLayer and add a rule for purchase: 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 Unphurl. Nothing to install.
purchase is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the purchase 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 purchase. 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.
purchase is provided by the Unphurl MCP server (123Ergo/unphurl-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 16 Unphurl tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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