liara_create_mail_server

THE RISK

Medium Risk

Why liara_create_mail_server needs a policy

This tool creates new infrastructure (mail server) which is a reversible write operation. It modifies the target system's state by adding a new service, but the operation can be undone (server can be deleted).

From the tool's definition Tool name 'liara_create_mail_server' and description 'Create a new mail server' indicate a creation operation that modifies infrastructure state.

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

POLICY

How to control liara_create_mail_server

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

policy.json

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

liara_create_mail_server 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 Liara MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 108 Liara MCP Server 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 liara_create_mail_server

What does the liara_create_mail_server tool do? +

Create a new mail server. It is categorised as a Write tool in the Liara MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on liara_create_mail_server? +

Register the Liara MCP Server MCP server in PolicyLayer and add a rule for liara_create_mail_server: 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 Liara MCP Server. Nothing to install.

What risk level is liara_create_mail_server? +

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

Can I rate-limit liara_create_mail_server? +

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

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

liara_create_mail_server is provided by the Liara MCP Server MCP server (razavioo/liara-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Liara MCP Server tool call.

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

CHECK YOUR STACK →