AI agents call rms_cancel_rate to retrieve information from Rms without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves cancellation rate and count metrics from Rakuten RMS sales data. It is consistent with the server's purpose of 'retrieval of Rakuten RMS sales data' and performs no write, execute, or destructive operations. It simply returns read-only statistical summaries.
From the tool's definition Tool name 'rms_cancel_rate' and description 'Cancellation rate and counts' indicate retrieval of statistical data only.
Attacks that exploit this kind of access
Cancellation rate and counts. It is categorised as a Read tool in the Rms MCP Server, which means it retrieves data without modifying state.
Register the Rms MCP server in PolicyLayer and add a rule for rms_cancel_rate: 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 Rms. Nothing to install.
rms_cancel_rate 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 rms_cancel_rate 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 rms_cancel_rate. 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.
rms_cancel_rate is provided by the Rms MCP server (yasuhidekoizumi-afk/rms-mcp). 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.
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