AI agents call check_receipt_status to retrieve information from ProofSlip without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves the current status of an existing receipt object. Polling for status is a non-destructive, side-effect-free query operation. No data is created, modified, deleted, or financial transactions occur. The low severity reflects minimal blast radius: an AI agent misuse would only return stale or incorrect status information, not cause harm.
From the tool's definition Tool name contains 'check' and 'status'; description states 'Lightweight status poll' — polling is a read operation that queries state without modifying it.
Attacks that exploit this kind of access
Lightweight status poll for a ProofSlip receipt. It is categorised as a Read tool in the ProofSlip MCP Server, which means it retrieves data without modifying state.
Register the ProofSlip MCP server in PolicyLayer and add a rule for check_receipt_status: 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 ProofSlip. Nothing to install.
check_receipt_status 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 check_receipt_status 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 check_receipt_status. 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.
check_receipt_status is provided by the ProofSlip MCP server (@proofslip/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →