mess_update_preferences

THE RISK

Medium Risk

Why mess_update_preferences needs a policy

The tool name strongly suggests updating (modifying) user preferences within a meal management system. This is a reversible modification (Write category), not destructive deletion. Severity is medium because preference changes affect account configuration and billing, but are typically reversible.

From the tool's definition Tool name 'mess_update_preferences' indicates modification of user preferences; sibling tools like 'mess_create_registration', 'mess_delete_monthly_registration', and 'mess_cancel_registration' confirm this server performs Write and Destructive operations on…

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

POLICY

How to control mess_update_preferences

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

policy.json

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

mess_update_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.

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

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EXPLORE

Related tools and policies

More IIITH Mess MCP tools

Destructive mess_cancel_registration mess_cancel_registration Destructive mess_delete_auth_key Delete an auth key by its name (not its value). Identified by name in the URL path. Destructive mess_delete_extra_registration Delete an extra registration by its ID (passed as query param). Destructive mess_delete_monthly_registration Delete a monthly mess registration (individual meal registrations are kept). Execute mess_login_msit Login as an MSIT student or intern using email + password. Write mess_reset_qr_token Reset the user's QR code token (shown at the mess counter). Write mess_provide_feedback Submit anonymous feedback for a meal. User must have availed the meal. Write mess_skip_meal Mark a registration as skipped or unskipped.

All 45 IIITH Mess MCP tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about mess_update_preferences

What does the mess_update_preferences tool do? +

mess_update_preferences. It is categorised as a Write tool in the IIITH Mess MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on mess_update_preferences? +

Register the IIITH Mess MCP server in PolicyLayer and add a rule for mess_update_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 IIITH Mess MCP. Nothing to install.

What risk level is mess_update_preferences? +

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

Can I rate-limit mess_update_preferences? +

Yes. Add a rate_limit block to the mess_update_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 mess_update_preferences completely? +

Set action: deny in the PolicyLayer policy for mess_update_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 mess_update_preferences? +

mess_update_preferences is provided by the IIITH Mess MCP server (kallind/iiith-mess-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every IIITH Mess MCP tool call.

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

CHECK YOUR STACK →