Check if the slot is available
AI agents call CheckAvailability to retrieve information from MCP Appointment Booking Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a lookup/query of appointment availability status. It has no side effects—it does not create, modify, delete, execute external code, or commit financial transactions. It is a straightforward retrieval of availability data, placing it firmly in the Read category with low severity since misuse would only expose harmless schedule information.
From the tool's definition Tool name 'CheckAvailability' and description 'Check if the slot is available' indicate a read-only query operation that retrieves availability information without modifying or affecting any data.
Attacks that exploit this kind of access
Check if the slot is available. It is categorised as a Read tool in the MCP Appointment Booking Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Appointment Booking Server MCP server in PolicyLayer and add a rule for CheckAvailability: 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 Appointment Booking Server. Nothing to install.
CheckAvailability 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 CheckAvailability 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 CheckAvailability. 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.
CheckAvailability is provided by the MCP Appointment Booking Server MCP server (manish-awase/mcp-appointment-booking-server). 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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