readonly_query · AWS IoT SiteWise MCP Server MCP

WHAT IT DOES

What readonly_query does on AWS IoT SiteWise MCP Server

AI agents call readonly_query 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.

WHY IT NEEDS A POLICY

Why readonly_query needs a policy

The 'readonly_query' designation strongly suggests this tool performs data retrieval or querying operations without modifying, deleting, or executing code. Despite the empty description (which slightly lowers confidence), the name itself is a clear indicator of read-only semantics. Read operations have the lowest severity because they do not alter system state or enable destructive actions.

From the tool's definition Tool name 'readonly_query' explicitly includes 'readonly', indicating read-only operations without side effects.

Attacks that exploit this kind of access

Questions about readonly_query

What does the readonly_query tool do? +

readonly_query. It is categorised as a Read tool in the AWS IoT SiteWise MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on readonly_query? +

Register the AWS IoT SiteWise MCP Server MCP server in PolicyLayer and add a rule for readonly_query: 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.

What risk level is readonly_query? +

readonly_query is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit readonly_query? +

Yes. Add a rate_limit block to the readonly_query 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.

How do I block readonly_query completely? +

Set action: deny in the PolicyLayer policy for readonly_query. 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.

What MCP server provides readonly_query? +

readonly_query 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.