Create a carnet (payment booklet with multiple parcels)
AI agents use create_carnet to create or update resources in Mcp Ap2 — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Ap2 environment.
The tool creates a carnet, which is a payment booklet containing multiple parcels. This is a reversible write operation that creates new financial data structures. While it operates in a financial system, the tool itself does not commit money transfers or create binding financial obligations—it creates a payment booklet structure.
From the tool's definition Tool description states 'Create a carnet (payment booklet with multiple parcels)' — this is a write operation that creates a new financial record/booklet. Server context is 'Google's Agent-to-Agent Payment Protocol' indicating financial domain.
Documented attack patterns abuse exactly the kind of access create_carnet gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for create_carnet:
{
"version": "1",
"default": "deny",
"tools": {
"create_carnet": {
"limits": [
{
"counter": "create_carnet_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_carnet stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Create a carnet (payment booklet with multiple parcels). It is categorised as a Write tool in the Mcp Ap2 MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for create_carnet: 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 Mcp Ap2. Nothing to install.
create_carnet 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 create_carnet 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 create_carnet. 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.
create_carnet is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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