AI agents call get_my_mentions 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 mention metadata from Teams messages. The verb 'Find' and the read-only nature of accessing @mention records confirms this is a data retrieval operation without persistent state changes, reversible actions, or external side effects. Consistent with sibling tools like 'get_channel_messages' and 'get_chat_messages' which are also Read category.
From the tool's definition Tool name 'get_my_mentions' and description 'Find recent messages where the current user was @mentioned' indicate retrieval of existing message data with no modification or side effects.
Attacks that exploit this kind of access
Find recent messages where the current user was @mentioned across all Teams channels and chats. 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_my_mentions: 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_my_mentions 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_my_mentions 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_my_mentions. 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_my_mentions 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.