Read replies to a specific message thread in a Teams channel.
AI agents call teams_read_message_replies to retrieve information from Microsoft Teams without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves existing message replies from a Teams channel thread. It performs a query operation without creating, modifying, deleting, or executing any actions. The blast radius of misuse is minimal—an agent could read messages it shouldn't have access to, but this is an authorization/confidentiality issue rather than a structural risk. Classified as Read with low severity.
From the tool's definition Tool name and description: 'Read replies to a specific message thread in a Teams channel.' The verb 'read' and lack of any modification, deletion, or execution language clearly indicate data retrieval with no side effects.
Attacks that exploit this kind of access
Read replies to a specific message thread in a Teams channel. It is categorised as a Read tool in the Microsoft Teams MCP Server, which means it retrieves data without modifying state.
Register the Microsoft Teams MCP server in PolicyLayer and add a rule for teams_read_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 Microsoft Teams. Nothing to install.
teams_read_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 teams_read_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 teams_read_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.
teams_read_message_replies is provided by the Microsoft Teams MCP server (microsoft-teams-mcp-server). 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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