delete_fhir_resource

THE RISK

Critical Risk

Why delete_fhir_resource needs a policy

This tool irreversibly deletes healthcare data from AWS HealthLake. Deletion of medical records is a destructive operation with no undo capability, making it the most severe category. The impact is critical because loss of healthcare data can affect patient care, compliance, and legal obligations. Misuse by an AI agent could result in permanent loss of sensitive patient information.

From the tool's definition Tool name contains 'delete' and description explicitly states 'Delete a FHIR resource from HealthLake'. FHIR resources in HealthLake are healthcare data that, once deleted, cannot be recovered without backups.

Documented attack patterns abuse exactly the kind of access delete_fhir_resource gives an agent:

POLICY

How to control delete_fhir_resource

PolicyLayer is an MCP gateway — it sits between your AI agents and AWS AppSync MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for delete_fhir_resource:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "delete_fhir_resource"
  ]
}

delete_fhir_resource disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register AWS AppSync MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More AWS AppSync MCP Server tools

Destructive bulk_delete_by_criteria bulk_delete_by_criteria Destructive cache_delete Delete a value from the cache. Destructive cache_delete_many Delete multiple values from the cache. Destructive cache_delete_multi Delete multiple values from the cache (alias for delete_many). Destructive cancel_logs_insight_query cancel_logs_insight_query Destructive delete delete Destructive delete_access_key delete_access_key Destructive delete_agent_runtime delete_agent_runtime

All 805 AWS AppSync MCP Server tools →

Destructive tools on other servers

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Go deeper

Critical-risk tools in AWS AppSync MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about delete_fhir_resource

What does the delete_fhir_resource tool do? +

Delete a FHIR resource from HealthLake. It is categorised as a Destructive tool in the AWS AppSync MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on delete_fhir_resource? +

Register the AWS AppSync MCP Server MCP server in PolicyLayer and add a rule for delete_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 AppSync MCP Server. Nothing to install.

What risk level is delete_fhir_resource? +

delete_fhir_resource is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit delete_fhir_resource? +

Yes. Add a rate_limit block to the delete_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.

How do I block delete_fhir_resource completely? +

Set action: deny in the PolicyLayer policy for delete_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.

What MCP server provides delete_fhir_resource? +

delete_fhir_resource is provided by the AWS AppSync MCP Server MCP server (awslabs.aws-appsync-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every AWS AppSync MCP Server tool call.

Start from AWS AppSync MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →