update_prescription · MCPDischarge MCP: Risk & Policy

WHAT IT DOES

What update_prescription does on MCPDischarge

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

WHY IT NEEDS A POLICY

Why update_prescription needs a policy

This tool creates or modifies prescription data in a reversible manner (prescriptions can be corrected or amended). While it operates on critical healthcare data (medications), it does not delete records irreversibly nor execute arbitrary code—it updates structured prescription information.

From the tool's definition Tool name 'update_prescription' and description 'Update discharge medications after doctor re-prescribes' explicitly indicates modification of existing prescription data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_prescription Rate-limited

update_prescription 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": {
    "update_prescription": {
      "limits": [
        {
          "counter": "update_prescription_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 MCPDischarge, so you can run agents against it safely.

FAQ

Questions about update_prescription

What does the update_prescription tool do? +

Update discharge medications after doctor re-prescribes. It is categorised as a Write tool in the MCPDischarge MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_prescription? +

Register the MCPDischarge MCP server in PolicyLayer and add a rule for update_prescription: 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 MCPDischarge. Nothing to install.

What risk level is update_prescription? +

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

Can I rate-limit update_prescription? +

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

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

update_prescription is provided by the MCPDischarge MCP server (prashantsingh1234/mcp_project). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.