describe-serverless-caches
AI agents call describe-serverless-caches 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 'describe' prefix is consistently used in AWS APIs to denote read-only operations that query resource properties. This tool retrieves information about serverless cache instances in ElastiCache/MemoryDB. Although the description is empty, the naming convention and context (AWS Labs MCP server for Valkey) strongly indicate this is an information retrieval operation with no side effects.
From the tool's definition Tool name 'describe-serverless-caches' uses the 'describe' verb, which is a standard AWS API pattern for retrieving resource metadata and configuration information without modifying state.
Attacks that exploit this kind of access
describe-serverless-caches. 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 describe-serverless-caches: 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.
describe-serverless-caches 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 describe-serverless-caches 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 describe-serverless-caches. 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.
describe-serverless-caches 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.