Lists available functions derived from the OpenAPI specification.
AI agents call list_functions to retrieve information from Appointment Manager MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and displays metadata about available functions without modifying, deleting, or executing any operations. It is purely informational and read-only, making it a Read category tool with low severity since exposure would only leak information about the API surface, not enable direct manipulation of appointments or other data.
From the tool's definition Tool name is 'list_functions' and description states it 'Lists available functions derived from the OpenAPI specification.' This is a query/retrieval operation with no side effects.
Attacks that exploit this kind of access
Lists available functions derived from the OpenAPI specification. It is categorised as a Read tool in the Appointment Manager MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Appointment Manager MCP Server MCP server in PolicyLayer and add a rule for list_functions: 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 Appointment Manager MCP Server. Nothing to install.
list_functions 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_functions 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_functions. 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_functions is provided by the Appointment Manager MCP Server MCP server (samuelr2112/mcp-project). 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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