List accessible Google Calendars, including primary and shared calendars.
AI agents call list-calendars to retrieve information from Universal Mcp Toolkit without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple enumeration of calendar resources. It queries existing data (calendar names and metadata) without creating, modifying, deleting, or executing operations. The blast radius of misuse is minimal—an attacker gains visibility into which calendars are accessible but cannot modify events, delete calendars, or trigger external actions.
From the tool's definition The tool name is 'list-calendars' and description states it 'List accessible Google Calendars'. The verb 'list' is a read-only operation that retrieves calendar information without modification.
Attacks that exploit this kind of access
List accessible Google Calendars, including primary and shared calendars. It is categorised as a Read tool in the Universal Mcp Toolkit MCP Server, which means it retrieves data without modifying state.
Register the Universal Mcp Toolkit MCP server in PolicyLayer and add a rule for list-calendars: 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 Universal Mcp Toolkit. Nothing to install.
list-calendars 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 list-calendars 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 list-calendars. 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.
list-calendars is provided by the Universal Mcp Toolkit MCP server (markgatcha/universal-mcp-toolkit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
list-calendars is one line of Universal Mcp Toolkit's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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