Finds both free and busy time slots in Google Calendars for specified calendars within a defined time range (defaults to the current day UTC if time_min/time_max are omitted). Returns busy intervals enriched with event details and calculates free slots by finding gaps between busy periods; time_m...
Part of the Google Calendar server.
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AI agents call GOOGLECALENDAR_FIND_FREE_SLOTS to retrieve information from Google Calendar without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though GOOGLECALENDAR_FIND_FREE_SLOTS only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"GOOGLECALENDAR_FIND_FREE_SLOTS": {}
}
}See the full Google Calendar policy for all 29 tools.
These attack patterns abuse exactly the kind of access GOOGLECALENDAR_FIND_FREE_SLOTS gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Finds both free and busy time slots in Google Calendars for specified calendars within a defined time range (defaults to the current day UTC if time_min/time_max are omitted). Returns busy intervals enriched with event details and calculates free slots by finding gaps between busy periods; time_min must precede time_max if both are provided. This action retrieves free and busy time slots for the specified calendars over a given time period. It analyzes the busy intervals from the calendars and provides calculated free slots based on the gaps in the busy periods.. It is categorised as a Read tool in the Google Calendar MCP Server, which means it retrieves data without modifying state.
Register the Google Calendar MCP server in PolicyLayer and add a rule for GOOGLECALENDAR_FIND_FREE_SLOTS: 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 Google Calendar. Nothing to install.
GOOGLECALENDAR_FIND_FREE_SLOTS is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the GOOGLECALENDAR_FIND_FREE_SLOTS 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.
Set action: deny in the PolicyLayer policy for GOOGLECALENDAR_FIND_FREE_SLOTS. 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.
GOOGLECALENDAR_FIND_FREE_SLOTS is provided by the Google Calendar MCP server (google-cal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 29 Google Calendar tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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