approve_proposal · Metis Public Health MCP: Risk & Policy

WHAT IT DOES

What approve_proposal does on Metis Public Health

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

WHY IT NEEDS A POLICY

Why approve_proposal needs a policy

This tool creates or modifies system state by approving and applying a proposal. While it does not delete data (ruling out Destructive), it goes beyond querying (Read) and involves active system modification that could affect downstream behavior or learning.

From the tool's definition Tool name 'approve_proposal' combined with description 'Approve a pending skill improvement proposal and apply it' indicates modification of system state through approval and application of a proposal.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

approve_proposal Rate-limited

approve_proposal 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": {
    "approve_proposal": {
      "limits": [
        {
          "counter": "approve_proposal_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 Metis Public Health, so you can run agents against it safely.

FAQ

Questions about approve_proposal

What does the approve_proposal tool do? +

Approve a pending skill improvement proposal and apply it. It is categorised as a Write tool in the Metis Public Health MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on approve_proposal? +

Register the Metis Public Health MCP server in PolicyLayer and add a rule for approve_proposal: 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 Metis Public Health. Nothing to install.

What risk level is approve_proposal? +

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

Can I rate-limit approve_proposal? +

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

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

approve_proposal is provided by the Metis Public Health MCP server (sveritg/metis_ph). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.