unset_chat_message_reaction · Teams MCP: Risk & Policy

WHAT IT DOES

What unset_chat_message_reaction does on Teams

AI agents use unset_chat_message_reaction to create or update resources in Teams — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Teams environment.

WHY IT NEEDS A POLICY

Why unset_chat_message_reaction needs a policy

Removing a reaction is a reversible modification to a chat message (the reaction can be re-added). It modifies data but does not delete the message itself, making it a Write action rather than Destructive. Blast radius is low as it only affects emoji reactions on messages.

From the tool's definition Remove a reaction from a message in a chat conversation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

unset_chat_message_reaction Rate-limited

unset_chat_message_reaction stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "unset_chat_message_reaction": {
      "limits": [
        {
          "counter": "unset_chat_message_reaction_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Teams, so you can run agents against it safely.

FAQ

Questions about unset_chat_message_reaction

What does the unset_chat_message_reaction tool do? +

Remove a reaction from a message in a chat conversation. It is categorised as a Write tool in the Teams MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on unset_chat_message_reaction? +

Register the Teams MCP server in PolicyLayer and add a rule for unset_chat_message_reaction: 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.

What risk level is unset_chat_message_reaction? +

unset_chat_message_reaction is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit unset_chat_message_reaction? +

Yes. Add a rate_limit block to the unset_chat_message_reaction 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.

How do I block unset_chat_message_reaction completely? +

Set action: deny in the PolicyLayer policy for unset_chat_message_reaction. 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.

What MCP server provides unset_chat_message_reaction? +

unset_chat_message_reaction 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.