AI agents call list_team_members 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 tool retrieves and queries membership information from a Teams resource. It performs a lookup operation that returns data without creating, modifying, deleting, or executing anything. The disclosure of email addresses and roles represents an information enumeration risk but remains a read operation with limited blast radius if misused by an AI agent (primarily information leakage rather than destructive action).
From the tool's definition Tool description explicitly states 'List all members' and 'Returns member names, email addresses, roles, and IDs' — core read/query operation with no modification or side effects.
Attacks that exploit this kind of access
List all members of a specific Microsoft Team. Returns member names, email addresses, roles, and IDs. 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 list_team_members: 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.
list_team_members 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_team_members 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_team_members. 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_team_members 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.