get-free-busy · Outlook Assistant MCP: Risk & Policy

WHAT IT DOES

What get-free-busy does on Outlook Assistant

AI agents call get-free-busy to retrieve information from Outlook Assistant without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

WHY IT NEEDS A POLICY

Why get-free-busy needs a policy

This tool queries and retrieves existing calendar availability information (free/busy status) for users. It performs a read-only operation with no capability to create, modify, delete, or execute actions. The data returned is calendar metadata rather than sensitive personal details, making the severity low even if exposed to an agent.

From the tool's definition Tool name 'get-free-busy' and description 'Returns the free/busy schedule for one or more users' indicates retrieval of calendar availability data without modification or side effects.

Attacks that exploit this kind of access

Questions about get-free-busy

What does the get-free-busy tool do? +

Returns the free/busy schedule for one or more users. It is categorised as a Read tool in the Outlook Assistant MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get-free-busy? +

Register the Outlook Assistant MCP server in PolicyLayer and add a rule for get-free-busy: 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 Outlook Assistant. Nothing to install.

What risk level is get-free-busy? +

get-free-busy is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get-free-busy? +

Yes. Add a rate_limit block to the get-free-busy 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.

How do I block get-free-busy completely? +

Set action: deny in the PolicyLayer policy for get-free-busy. 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.

What MCP server provides get-free-busy? +

get-free-busy is provided by the Outlook Assistant MCP server (titanzero/outlook-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.