List all Timestream for InfluxDB DB instances
AI agents call ListDbInstances 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.
This tool performs a read-only operation to list database instances. It queries existing data and returns results with no side effects, no data creation, modification, or deletion, and no code execution or external operations triggered. The blast radius of misuse is low—an attacker could discover database infrastructure but cannot alter it or access the data within unless granted separate permissions.
From the tool's definition Tool name 'ListDbInstances' and description 'List all Timestream for InfluxDB DB instances' indicate a query operation that retrieves information about existing database instances without modification.
Attacks that exploit this kind of access
List all Timestream for InfluxDB DB instances. 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 ListDbInstances: 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.
ListDbInstances 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 ListDbInstances 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 ListDbInstances. 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.
ListDbInstances 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.