Check Costco membership status, type, and renewal date
AI agents call get_membership to retrieve information from Mcp Costco without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves membership information without creating, modifying, or deleting data. It is a straightforward query operation that poses minimal risk if misused by an AI agent—exposure of personal membership details is a privacy concern but not a capability threat (no financial transactions, account modifications, or destructive actions are possible with this tool alone).
From the tool's definition Tool name and description indicate a query-only operation: 'Check Costco membership status, type, and renewal date'. The verb 'check' and the read-only nature of membership status inspection confirm no data modification or side effects occur.
Attacks that exploit this kind of access
Check Costco membership status, type, and renewal date. It is categorised as a Read tool in the Mcp Costco MCP Server, which means it retrieves data without modifying state.
Register the Mcp Costco MCP server in PolicyLayer and add a rule for get_membership: 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 Costco. Nothing to install.
get_membership 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 get_membership 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 get_membership. 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.
get_membership is provided by the Mcp Costco MCP server (markswendsen-code/mcp-costco). 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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