mess_cancel_registration

THE RISK

Critical Risk

Why mess_cancel_registration needs a policy

The tool name strongly suggests it cancels (irreversibly removes) a meal registration. Cancellation of a registration is typically a destructive/irreversible action — once a meal registration is cancelled, the slot may be gone and the action cannot be undone.

From the tool's definition Tool name: mess_cancel_registration; description is empty

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

POLICY

How to control mess_cancel_registration

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_cancel_registration:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "mess_cancel_registration"
  ]
}

mess_cancel_registration disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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.

RESTRICT THIS TOOL →

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EXPLORE

Related tools and policies

More IIITH Mess MCP tools

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. Write mess_uncancel_registration Restore a previously cancelled meal registration.

All 45 IIITH Mess MCP tools →

Destructive tools on other servers

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Go deeper

Critical-risk tools in IIITH Mess MCP → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about mess_cancel_registration

What does the mess_cancel_registration tool do? +

mess_cancel_registration. It is categorised as a Destructive tool in the IIITH Mess MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on mess_cancel_registration? +

Register the IIITH Mess MCP server in PolicyLayer and add a rule for mess_cancel_registration: 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_cancel_registration? +

mess_cancel_registration is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit mess_cancel_registration? +

Yes. Add a rate_limit block to the mess_cancel_registration 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_cancel_registration completely? +

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

mess_cancel_registration 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 →