write_user_preferences · Metis Public Health MCP

WHAT IT DOES

What write_user_preferences does on Metis Public Health

AI agents use write_user_preferences 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 write_user_preferences needs a policy

This tool modifies user preferences, which is a reversible Write operation rather than destructive. The empty description lowers confidence slightly, but the naming convention in the context of a research companion (where sibling tools include 'add_memory_entry', 'add_glossary_term') strongly suggests preference configuration.

From the tool's definition Tool name 'write_user_preferences' indicates creating or modifying user preference settings. The verb 'write' combined with 'user_preferences' suggests reversible data modification typical of configuration or profile updates.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

write_user_preferences Rate-limited

write_user_preferences 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": {
    "write_user_preferences": {
      "limits": [
        {
          "counter": "write_user_preferences_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 write_user_preferences

What does the write_user_preferences tool do? +

write_user_preferences. 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 write_user_preferences? +

Register the Metis Public Health MCP server in PolicyLayer and add a rule for write_user_preferences: 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 write_user_preferences? +

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

Can I rate-limit write_user_preferences? +

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

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

write_user_preferences 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.