teams_save_message · Teams MCP Server MCP: Risk & Policy

WHAT IT DOES

What teams_save_message does on Teams MCP Server

AI agents use teams_save_message 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_save_message needs a policy

Saving/bookmarking is a metadata write operation that creates user-specific state (the saved status of a message). It is reversible (can be unsaved), has no side effects beyond the user's own saved messages collection, and poses minimal risk if triggered unexpectedly. While it modifies Teams state, it does so non-destructively and with limited blast radius, making it Write category with low severity.

From the tool's definition Tool performs 'Save (bookmark) a message' action, which creates a reversible marker/bookmark on an existing message without modifying message content or deleting data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

teams_save_message Rate-limited

teams_save_message 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_save_message": {
      "limits": [
        {
          "counter": "teams_save_message_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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_save_message

What does the teams_save_message tool do? +

Save (bookmark) a message in Teams. Saved messages can be accessed later from the Saved view in Teams. 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_save_message? +

Register the Teams MCP Server MCP server in PolicyLayer and add a rule for teams_save_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 MCP Server. Nothing to install.

What risk level is teams_save_message? +

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

Can I rate-limit teams_save_message? +

Yes. Add a rate_limit block to the teams_save_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.

How do I block teams_save_message completely? +

Set action: deny in the PolicyLayer policy for teams_save_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.

What MCP server provides teams_save_message? +

teams_save_message 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.