Retrieve all resources related to a specific patient using the FHIR $patient-everything operation
AI agents call patient_everything to retrieve information from Awslabs Amazon Sns Sqs without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Despite the tool name 'patient_everything' and the incongruent server context (SNS/SQS messaging), the tool's actual function is to retrieve FHIR patient data. Retrieval operations that query data without modification, deletion, or execution of arbitrary code fall squarely into the Read category.
From the tool's definition Tool description states 'Retrieve all resources related to a specific patient', which is a query/retrieval operation with no side effects. The FHIR $patient-everything operation is a standard read-only API operation that fetches data.
Documented attack patterns abuse exactly the kind of access patient_everything gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Awslabs Amazon Sns Sqs, and nothing reaches the server without passing your rules. This is the rule we recommend for patient_everything:
{
"version": "1",
"default": "deny",
"tools": {
"patient_everything": {}
}
}patient_everything is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieve all resources related to a specific patient using the FHIR $patient-everything operation. It is categorised as a Read tool in the Awslabs Amazon Sns Sqs MCP Server, which means it retrieves data without modifying state.
Register the Awslabs Amazon Sns Sqs MCP server in PolicyLayer and add a rule for patient_everything: 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 Awslabs Amazon Sns Sqs. Nothing to install.
patient_everything 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 patient_everything 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 patient_everything. 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.
patient_everything is provided by the Awslabs Amazon Sns Sqs MCP server (awslabs.amazon-sns-sqs-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Awslabs Amazon Sns Sqs, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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