teams_add_favorite · Teams MCP Server MCP: Risk & Policy

WHAT IT DOES

What teams_add_favorite does on Teams MCP Server

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

WHY IT NEEDS A POLICY

Why teams_add_favorite needs a policy

This tool modifies user data (favorites list) reversibly. Adding a conversation to favorites is a write operation that creates or updates a preference setting. It has low severity because the effect is limited to changing personal organization settings with no impact on shared data, financial transactions, or system integrity. The blast radius is minimal—at worst it clutters the user's favorites list.

From the tool's definition Tool adds a conversation to the user's favorites, which creates/modifies metadata associated with the user's Teams preferences. The description states 'Add a conversation to the user' indicating a non-destructive modification of user-controlled state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

teams_add_favorite Rate-limited

teams_add_favorite 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": {
    "teams_add_favorite": {
      "limits": [
        {
          "counter": "teams_add_favorite_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 MCP Server, so you can run agents against it safely.

FAQ

Questions about teams_add_favorite

What does the teams_add_favorite tool do? +

Add a conversation to the user\. It is categorised as a Write tool in the Teams MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on teams_add_favorite? +

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

What risk level is teams_add_favorite? +

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

Can I rate-limit teams_add_favorite? +

Yes. Add a rate_limit block to the teams_add_favorite 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 teams_add_favorite completely? +

Set action: deny in the PolicyLayer policy for teams_add_favorite. 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 teams_add_favorite? +

teams_add_favorite 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.