ListECRRepositories
AI agents call ListECRRepositories 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.
This tool retrieves a list of ECR repositories, which is a read-only operation with no side effects. It queries existing data without creating, modifying, or deleting anything. The empty description reduces confidence slightly, but the naming convention strongly indicates a benign list/describe operation. Severity is low because listing repositories exposes metadata (names, URIs) but not secrets or data contents.
From the tool's definition Tool name 'ListECRRepositories' indicates enumeration/listing of AWS ECR repositories. The 'List' prefix is a standard AWS API pattern for read-only operations that retrieve resource metadata without modification.
Attacks that exploit this kind of access
ListECRRepositories. 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 ListECRRepositories: 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.
ListECRRepositories 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 ListECRRepositories 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 ListECRRepositories. 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.
ListECRRepositories 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.