get_today_summary
AI agents call get_today_summary to retrieve information from Calendar App without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves summary information about today's calendar events and reminders. It performs a read-only query with no side effects, data modification, or execution of external operations. The empty description reduces confidence slightly, but the naming convention and sibling tool patterns strongly indicate a benign read operation.
From the tool's definition Tool name 'get_today_summary' and sibling tools (get_events, get_reminders, list_calendars, search) all indicate retrieval operations. Server description states 'viewing, searching, and filtering calendar data' with no modification capabilities mentioned.
Attacks that exploit this kind of access
get_today_summary. It is categorised as a Read tool in the Calendar App MCP Server, which means it retrieves data without modifying state.
Register the Calendar App MCP server in PolicyLayer and add a rule for get_today_summary: 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 Calendar App. Nothing to install.
get_today_summary 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 get_today_summary 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 get_today_summary. 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.
get_today_summary is provided by the Calendar App MCP server (rygwdn/calendar-app-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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