create_journal · CalDAV MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_journal does on CalDAV MCP Server

AI agents use create_journal 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_journal needs a policy

Creating a journal entry is a Write operation: it adds new data to the calendar system reversibly (entries can be edited or deleted later). It has minimal blast radius—a misbehaving agent might create unwanted journal entries, but these are easily removed. The operation is neither destructive (irreversible), executable (code/command), nor financial.

From the tool's definition Tool description states 'Create a new journal entry' — a reversible write operation that creates new data without side effects beyond the journal itself.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_journal Rate-limited

create_journal 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_journal": {
      "limits": [
        {
          "counter": "create_journal_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_journal

What does the create_journal tool do? +

Create a new journal entry on the calendar. Dates in ISO format. 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_journal? +

Register the CalDAV MCP Server MCP server in PolicyLayer and add a rule for create_journal: 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_journal? +

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

Can I rate-limit create_journal? +

Yes. Add a rate_limit block to the create_journal 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_journal completely? +

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

create_journal 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.