free-tier-usage
AI agents call free-tier-usage to retrieve information from Awslabs Valkey without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name strongly implies data retrieval of free tier usage metrics, which would be a Read operation with no side effects. However, confidence is reduced to medium-low because the description is empty and uninformative, creating uncertainty about actual behavior. If it were to modify billing settings or trigger account changes, it would be more severe, but the name gives no indication of this.
From the tool's definition Tool name 'free-tier-usage' suggests querying usage information; description is empty, providing no definitive details about functionality or side effects.
Attacks that exploit this kind of access
free-tier-usage. It is categorised as a Read tool in the Awslabs Valkey MCP Server, which means it retrieves data without modifying state.
Register the Awslabs Valkey MCP server in PolicyLayer and add a rule for free-tier-usage: 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 Awslabs Valkey. Nothing to install.
free-tier-usage 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 free-tier-usage 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 free-tier-usage. 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.
free-tier-usage is provided by the Awslabs Valkey MCP server (awslabs.valkey-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.