AI agents call get_channel_message_replies 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 only fetches and returns existing data from channel messages. It performs a retrieval operation (get) without creating, modifying, deleting, or executing any actions. The description explicitly states it 'returns' information, indicating read-only access. No data is changed or deleted, and no code is executed.
From the tool's definition Tool retrieves message replies with 'Get all replies' and returns 'reply content, sender information, and timestamps' — purely query operations with no modifications or side effects.
Attacks that exploit this kind of access
Get all replies to a specific message in a channel. Returns reply content, sender information, and timestamps. 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_channel_message_replies: 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_channel_message_replies 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_channel_message_replies 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_channel_message_replies. 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_channel_message_replies 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.