calcom_add_appointment · Cal Com Calendar MCP Server MCP

WHAT IT DOES

What calcom_add_appointment does on Cal Com Calendar MCP Server

AI agents use calcom_add_appointment to create or update resources in Cal Com Calendar MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Cal Com Calendar MCP Server environment.

WHY IT NEEDS A POLICY

Why calcom_add_appointment needs a policy

This tool creates new calendar appointments, which is a reversible data modification operation. It falls under Write category as it adds data without deleting or executing arbitrary code. Severity is medium because misuse could schedule unwanted appointments affecting the user's calendar and potentially others' schedules, but the operation is reversible through deletion.

From the tool's definition Tool name 'calcom_add_appointment' and description 'Creates a new appointment in Cal.com calendar' indicate creation of calendar data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

calcom_add_appointment Rate-limited

calcom_add_appointment 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": {
    "calcom_add_appointment": {
      "limits": [
        {
          "counter": "calcom_add_appointment_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 Cal Com Calendar MCP Server, so you can run agents against it safely.

FAQ

Questions about calcom_add_appointment

What does the calcom_add_appointment tool do? +

Creates a new appointment in Cal.com calendar. It is categorised as a Write tool in the Cal Com Calendar 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 calcom_add_appointment? +

Register the Cal Com Calendar MCP Server MCP server in PolicyLayer and add a rule for calcom_add_appointment: 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 Cal Com Calendar MCP Server. Nothing to install.

What risk level is calcom_add_appointment? +

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

Can I rate-limit calcom_add_appointment? +

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

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

calcom_add_appointment is provided by the Cal Com Calendar MCP Server MCP server (mumunha/cal_dot_com_mcpserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.