addAllergy · Medical MCP Server MCP: Risk & Policy

WHAT IT DOES

What addAllergy does on Medical MCP Server

AI agents use addAllergy to create or update resources in Medical MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Medical MCP Server environment.

WHY IT NEEDS A POLICY

Why addAllergy needs a policy

This tool creates new allergy entries in patient records, which is a reversible write operation. While not destructive (data can be modified or removed), it modifies critical healthcare data that could affect clinical decision-making and patient safety if incorrect allergies are added (e.g., false allergies could cause unnecessary treatment restrictions; missing real allergies could lead to harmful drug…

From the tool's definition Tool name 'addAllergy' and description 'Add a new allergy to patient records' indicate creation of new data in a medical record system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

addAllergy Rate-limited

addAllergy stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "addAllergy": {
      "limits": [
        {
          "counter": "addallergy_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Medical MCP Server, so you can run agents against it safely.

FAQ

Questions about addAllergy

What does the addAllergy tool do? +

Add a new allergy to patient records. It is categorised as a Write tool in the Medical MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on addAllergy? +

Register the Medical MCP Server MCP server in PolicyLayer and add a rule for addAllergy: 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 Medical MCP Server. Nothing to install.

What risk level is addAllergy? +

addAllergy is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit addAllergy? +

Yes. Add a rate_limit block to the addAllergy 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 addAllergy completely? +

Set action: deny in the PolicyLayer policy for addAllergy. 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 addAllergy? +

addAllergy is provided by the Medical MCP Server MCP server (sinduja98/sample-mcp-postmessage). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.