CDK Bot: receive the product key after paying. Two ways to pay: (1) one-shot — pass x_payment, a signed EIP-3009 "exact" X-PAYMENT header (from accepts[] in get_price_quote); the facilitator settles it gaslessly, no tx_hash needed. (2) two-step — send USDC yourself, then pass tx_hash + quote_id.
Part of the Cdk Mcp server.
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AI agents use confirm_purchase to create or modify resources in Cdk Mcp. 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 confirm_purchase 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 Cdk Mcp.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"confirm_purchase": {
"limits": [
{
"counter": "confirm_purchase_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Cdk Mcp policy for all 8 tools.
These attack patterns abuse exactly the kind of access confirm_purchase 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.
CDK Bot: receive the product key after paying. Two ways to pay: (1) one-shot — pass x_payment, a signed EIP-3009 "exact" X-PAYMENT header (from accepts[] in get_price_quote); the facilitator settles it gaslessly, no tx_hash needed. (2) two-step — send USDC yourself, then pass tx_hash + quote_id.. It is categorised as a Write tool in the Cdk Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Cdk MCP server in PolicyLayer and add a rule for confirm_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 Cdk Mcp. Nothing to install.
confirm_purchase 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 confirm_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 confirm_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.
confirm_purchase is provided by the Cdk MCP server (https://mcp.cdk.bot/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 Cdk Mcp tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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