ListECRRepositories
AI agents call ListECRRepositories to retrieve information from AWS IoT SiteWise MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
ListECRRepositories retrieves information about existing ECR repositories—a read-only operation with no side effects. While the description is empty, the name clearly indicates a list/query operation. Even if an AI agent misuses this tool, it only exposes metadata about repositories without creating, modifying, deleting, or executing anything.
From the tool's definition Tool name 'ListECRRepositories' indicates enumeration/listing of AWS ECR repositories. The 'List' prefix is a typical Read operation pattern in AWS APIs that queries and retrieves data without modification.
Attacks that exploit this kind of access
ListECRRepositories. It is categorised as a Read tool in the AWS IoT SiteWise MCP Server MCP Server, which means it retrieves data without modifying state.
Register the AWS IoT SiteWise MCP Server 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 AWS IoT SiteWise MCP Server. 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 AWS IoT SiteWise MCP Server MCP server (awslabs.aws-iot-sitewise-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.