create_calendar_event · Langfuse Observability MCP

WHAT IT DOES

What create_calendar_event does on Langfuse Observability

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

WHY IT NEEDS A POLICY

Why create_calendar_event needs a policy

This tool creates calendar events, which is a write operation. It modifies state by adding data to Google Calendar, but the action is reversible (events can be deleted or modified later). This is not Execute because it doesn't run arbitrary code or trigger complex external operations—it simply creates a calendar entry with specified parameters.

From the tool's definition Tool description: 'Creates a new event in Google Calendar.' The verb 'Creates' indicates a reversible modification operation. Google Calendar events can be edited or deleted after creation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_calendar_event Rate-limited

create_calendar_event 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_calendar_event": {
      "limits": [
        {
          "counter": "create_calendar_event_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 Langfuse Observability, so you can run agents against it safely.

FAQ

Questions about create_calendar_event

What does the create_calendar_event tool do? +

Creates a new event in Google Calendar. It is categorised as a Write tool in the Langfuse Observability 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_calendar_event? +

Register the Langfuse Observability MCP server in PolicyLayer and add a rule for create_calendar_event: 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 Langfuse Observability. Nothing to install.

What risk level is create_calendar_event? +

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

Can I rate-limit create_calendar_event? +

Yes. Add a rate_limit block to the create_calendar_event 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_calendar_event completely? +

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

create_calendar_event is provided by the Langfuse Observability MCP server (langfuse-observability-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.