Search for FHIR resources in HealthLake datastore with advanced search capabilities. Returns up to 100 results per call. If pagination.has_next is true, call this tool again with the next_token to get more results.
AI agents call search_fhir_resources 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 healthcare data from a HealthLake FHIR datastore without modifying, creating, deleting, or executing any operations. It is purely a query/search function with no side effects. While the data returned may be sensitive (FHIR health records), the tool itself performs no destructive or write actions, placing it squarely in the Read category.
From the tool's definition Tool description states it 'Search[es] for FHIR resources' and 'Returns up to 100 results per call' with pagination support.
Attacks that exploit this kind of access
Search for FHIR resources in HealthLake datastore with advanced search capabilities. Returns up to 100 results per call. If pagination.has_next is true, call this tool again with the next_token to get more results. 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 search_fhir_resources: 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.
search_fhir_resources 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 search_fhir_resources 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 search_fhir_resources. 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.
search_fhir_resources 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.