calendar_update_event

Update an existing event in Google Calendar. Can modify title, time, location, description, and attendees. Only specified fields will be updated.

SERVERDialogbrain SOURCEhttps://api.dialogbrain.com/mcp

Medium RISK CLASS

Category Write

Parameters 81 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/io-github-saloprj-dialogbrain/calendar-update-event.md

WHAT IT DOES

What calendar_update_event does on Dialogbrain

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

Parameter	Type	Required	Description
`end`	string	—	New end time in ISO 8601 format. Optional.
`start`	string	—	New start time in ISO 8601 format. Optional.
`summary`	string	—	New event title/summary. Optional.
`event_id`	string	Yes	ID of the event to update. Required.
`location`	string	—	New event location. Optional.
`attendees`	array	—	New list of attendee emails. Replaces existing attendees.
`calendar_id`	string	—	Calendar ID containing the event. OMIT to use the agent's configured default calendar (or primary).
`description`	string	—	New event description. Optional.

Parameters from the server's own tool schema.

RISK

Why calendar_update_event is rated Medium

The tool creates or modifies data in a reversible manner by updating calendar events. While it does not delete or destroy data (which would be Destructive), and does not involve financial transactions, it does permanently alter state until corrected.

From the tool's definition Tool description states 'Update an existing event in Google Calendar. Can modify title, time, location, description, and attendees.' This is a write operation that modifies data reversibly (existing events can be updated again or reverted).

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs calendar_update_event safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Dialogbrain, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For calendar_update_event, this is the rule to start with:

calendar_update_event Rate-limited

calendar_update_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": {
    "calendar_update_event": {
      "limits": [
        {
          "counter": "calendar_update_event_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Dialogbrain, apply this rule, and every calendar_update_event call is checked against it from then on.

FAQ

Questions about calendar_update_event

What does the calendar_update_event tool do? +

Update an existing event in Google Calendar. Can modify title, time, location, description, and attendees. Only specified fields will be updated. It is categorised as a Write tool in the Dialogbrain MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does calendar_update_event accept? +

calendar_update_event accepts 8 parameters: end, start, summary, event_id, location, attendees, calendar_id, description. Required: event_id. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on calendar_update_event? +

Register the Dialogbrain MCP server in PolicyLayer and add a rule for calendar_update_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 Dialogbrain. Nothing to install.

What risk level is calendar_update_event? +

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

Can I rate-limit calendar_update_event? +

Yes. Add a rate_limit block to the calendar_update_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 calendar_update_event completely? +

Set action: deny in the PolicyLayer policy for calendar_update_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 calendar_update_event? +

calendar_update_event is provided by the Dialogbrain MCP server (https://api.dialogbrain.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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