Check your Starbucks Rewards Star balance, reward level (Green/Gold), and available rewards you can redeem. Requires being logged in.
AI agents call get_rewards to retrieve information from Mcp Starbucks without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only operation that queries user account data (balance, membership tier, available rewards). It requires authentication but makes no modifications, financial transactions, or irreversible changes. The worst misuse would be information disclosure about the user's reward balance, which is low-impact.
From the tool's definition The tool description states it "Check[s] your Starbucks Rewards Star balance, reward level (Green/Gold), and available rewards you can redeem" — purely retrieving account information with no side effects.
Attacks that exploit this kind of access
Check your Starbucks Rewards Star balance, reward level (Green/Gold), and available rewards you can redeem. Requires being logged in. It is categorised as a Read tool in the Mcp Starbucks MCP Server, which means it retrieves data without modifying state.
Register the Mcp Starbucks MCP server in PolicyLayer and add a rule for get_rewards: 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 Starbucks. Nothing to install.
get_rewards 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_rewards 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_rewards. 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_rewards is provided by the Mcp Starbucks MCP server (markswendsen-code/mcp-starbucks). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
get_rewards is one line of Mcp Starbucks's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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