Amount ${context.amount} exceeds high threshold
Part of the Stripe server.
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AI agents call high_amount to retrieve information from Stripe 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 high_amount 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": {
"high_amount": {}
}
}See the full Stripe policy for all 39 tools.
These attack patterns abuse exactly the kind of access high_amount 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.
Amount ${context.amount} exceeds high threshold. It is categorised as a Read tool in the Stripe MCP Server, which means it retrieves data without modifying state.
Register the Stripe MCP server in PolicyLayer and add a rule for high_amount: 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 Stripe. Nothing to install.
high_amount 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 high_amount 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 high_amount. 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.
high_amount is provided by the Stripe MCP server (stripe-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 39 Stripe tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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