Check if specific people are available during a time period
AI agents call check_availability to retrieve information from MCP Calendar Assistant without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query of calendar availability data. It retrieves information about whether people are free during specified times, with no side effects, data modification, code execution, or irreversible actions. The operation is passive and informational, fitting the Read category with low severity since misuse would only expose scheduling information without operational impact.
From the tool's definition Tool name 'check_availability' and description 'Check if specific people are available during a time period' indicate a query operation that retrieves availability information without modifying or executing actions.
Attacks that exploit this kind of access
Check if specific people are available during a time period. It is categorised as a Read tool in the MCP Calendar Assistant MCP Server, which means it retrieves data without modifying state.
Register the MCP Calendar Assistant MCP server in PolicyLayer and add a rule for check_availability: 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 MCP Calendar Assistant. Nothing to install.
check_availability 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 check_availability 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 check_availability. 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.
check_availability is provided by the MCP Calendar Assistant MCP server (momer17/mailmcp). 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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