List all Timestream for InfluxDB instances belonging to a specific DB cluster.
AI agents call LsInstancesOfCluster to retrieve information from Amazon ElastiCache Memcached MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates existing database instances within a cluster. It performs a read-only query operation with no ability to modify, delete, or execute code. The blast radius of misuse is minimal—an attacker gains visibility into infrastructure but cannot alter or destroy resources. Classified as Read with low severity.
From the tool's definition Tool name 'LsInstancesOfCluster' and description 'List all Timestream for InfluxDB instances belonging to a specific DB cluster' indicate a query/list operation with no mutation or side effects.
Attacks that exploit this kind of access
List all Timestream for InfluxDB instances belonging to a specific DB cluster. It is categorised as a Read tool in the Amazon ElastiCache Memcached MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Amazon ElastiCache Memcached MCP Server MCP server in PolicyLayer and add a rule for LsInstancesOfCluster: 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 Amazon ElastiCache Memcached MCP Server. Nothing to install.
LsInstancesOfCluster 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 LsInstancesOfCluster 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 LsInstancesOfCluster. 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.
LsInstancesOfCluster is provided by the Amazon ElastiCache Memcached MCP Server MCP server (awslabs.memcached-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.