create_todo · CalDAV MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_todo does on CalDAV MCP Server

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

WHY IT NEEDS A POLICY

Why create_todo needs a policy

This tool creates a new todo entry, which is a reversible write operation. It does not delete, execute code, move money, or trigger external side effects beyond storing a calendar entry. The blast radius is medium because an AI agent could spam todos or create misleading calendar entries, but the operation is reversible via delete_todo.

From the tool's definition Tool name 'create_todo' and description 'Create a new todo on the calendar' indicate data creation. Server description states 'Enables CRUD operations for calendar events, journal entries, and todos', confirming write capability.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_todo Rate-limited

create_todo 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": {
    "create_todo": {
      "limits": [
        {
          "counter": "create_todo_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 CalDAV MCP Server, so you can run agents against it safely.

FAQ

Questions about create_todo

What does the create_todo tool do? +

Create a new todo on the calendar. Time in ISO format (e.g., '2026-01-14T02:16:17.478'). It is categorised as a Write tool in the CalDAV 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 create_todo? +

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

What risk level is create_todo? +

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

Can I rate-limit create_todo? +

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

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

create_todo is provided by the CalDAV MCP Server MCP server (thegreatgooo/radicale-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.