list_canaries
AI agents call list_canaries 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.
The 'list_canaries' function retrieves or enumerates canary resources (likely CloudWatch Synthetics canaries in the AWS IoT SiteWise context). This is a query operation with no inherent side effects—it does not modify, delete, execute, or create resources. The low severity reflects minimal blast radius if misused by an agent; listing resources poses limited risk.
From the tool's definition Tool name 'list_canaries' indicates a listing/query operation. The verb 'list' is characteristic of Read operations that retrieve data without side effects. No description provided, but the naming pattern is clear.
Attacks that exploit this kind of access
list_canaries. 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 list_canaries: 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.
list_canaries 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 list_canaries 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 list_canaries. 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.
list_canaries 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.