Get a specific FHIR resource by ID
AI agents call read_fhir_resource 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 retrieves a FHIR (Fast Healthcare Interoperability Resources) resource by its identifier. It performs a query/fetch operation without modifying, deleting, or executing any operations. The verb 'read' and the action of getting a resource by ID are characteristic of Read category tools. Severity is low because misuse would only expose existing data, not modify or delete it.
From the tool's definition Tool name 'read_fhir_resource' with description 'Get a specific FHIR resource by ID' indicates a retrieval operation with no side effects.
Attacks that exploit this kind of access
Get a specific FHIR resource by ID. 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 read_fhir_resource: 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.
read_fhir_resource 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 read_fhir_resource 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 read_fhir_resource. 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.
read_fhir_resource 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.