AI agents call get_user to retrieve information from Teams without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only query operation that retrieves user profile data. No data is created, modified, deleted, or executed. The medium severity reflects that unauthorized user enumeration or profiling could enable social engineering or targeted attacks, but the blast radius is contained to information disclosure.
From the tool's definition Tool description states it 'Get[s] detailed information about a specific user' and 'Returns profile information including name, email, job title, and department' - purely data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Get detailed information about a specific user by their ID or email address. Returns profile information including name, email, job title, and department. It is categorised as a Read tool in the Teams MCP Server, which means it retrieves data without modifying state.
Register the Teams MCP server in PolicyLayer and add a rule for get_user: 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 Teams. Nothing to install.
get_user 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 get_user 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 get_user. 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.
get_user is provided by the Teams MCP server (@floriscornel/teams-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.