Soft delete a message in a channel. Only the message sender can delete their own messages. The message will be marked as deleted.
AI agents call delete_channel_message to permanently remove resources in Teams — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool irreversibly removes message data from a Teams channel (soft delete marks it as deleted). Although restricted to the message sender, deletion cannot be undone and represents data loss. This is more severe than Write (which is reversible) and qualifies as Destructive. The impact is scoped to individual messages, making severity high rather than critical.
From the tool's definition Tool name 'delete_channel_message' and description explicitly states it performs a 'delete' operation. The description says the message 'will be marked as deleted', indicating irreversible removal of message content from the channel.
Attacks that exploit this kind of access
Soft delete a message in a channel. Only the message sender can delete their own messages. The message will be marked as deleted. It is categorised as a Destructive tool in the Teams MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Teams MCP server in PolicyLayer and add a rule for delete_channel_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. Nothing to install.
delete_channel_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 delete_channel_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 delete_channel_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.
delete_channel_message 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.