Delete one of your own messages (soft delete - the message remains but content becomes empty). You can only delete messages you sent, unless you are a channel owner/moderator.
AI agents call teams_delete_message to permanently remove resources in Teams MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Although the message record persists, the content deletion is irreversible and permanently destroys the message data. This constitutes a destructive operation. The blast radius is high because an AI agent could delete important communications, meeting notes, or records that users intended to preserve, especially if the agent has access to channels where it acts as owner/moderator (deletion scope expands beyond own…
From the tool's definition Tool name is 'teams_delete_message' and description states 'Delete one of your own message' and 'the message remains but content becomes empty'. The action irreversibly removes message content.
Attacks that exploit this kind of access
Delete one of your own messages (soft delete - the message remains but content becomes empty). You can only delete messages you sent, unless you are a channel owner/moderator. It is categorised as a Destructive tool in the Teams MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Teams MCP Server MCP server in PolicyLayer and add a rule for teams_delete_message: 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 MCP Server. Nothing to install.
teams_delete_message is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the teams_delete_message 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 teams_delete_message. 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.
teams_delete_message is provided by the Teams MCP Server MCP server (m0nkmaster/msteams-mcp). 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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