contacts_create_contact · Pyfastmail MCP: Risk & Policy

WHAT IT DOES

What contacts_create_contact does on Pyfastmail

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

WHY IT NEEDS A POLICY

Why contacts_create_contact needs a policy

Creating contacts is a reversible write operation that modifies account data. It does not delete data (Destructive), execute arbitrary code (Execute), move money (Financial), or merely read data (Read). The 'medium' severity reflects that unintended contact creation could clutter an account but is not catastrophic; users can delete contacts afterward.

From the tool's definition Tool name 'contacts_create_contact' indicates creation of contact records. Server description states the MCP provides 'full access to Fastmail accounts for managing email, contacts, calendars, and file storage' with tools to 'enable comprehensive account…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

contacts_create_contact Rate-limited

contacts_create_contact 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": {
    "contacts_create_contact": {
      "limits": [
        {
          "counter": "contacts_create_contact_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Pyfastmail, so you can run agents against it safely.

FAQ

Questions about contacts_create_contact

What does the contacts_create_contact tool do? +

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

How do I enforce a policy on contacts_create_contact? +

Register the Pyfastmail MCP server in PolicyLayer and add a rule for contacts_create_contact: 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 Pyfastmail. Nothing to install.

What risk level is contacts_create_contact? +

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

Can I rate-limit contacts_create_contact? +

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

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

contacts_create_contact is provided by the Pyfastmail MCP server (pjosols/pyfastmail-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.