teams_login · Teams MCP Server MCP: Risk & Policy

WHAT IT DOES

What teams_login does on Teams MCP Server

AI agents invoke teams_login to trigger actions in Teams MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why teams_login needs a policy

This tool triggers an external login/authentication flow, which is an operation with side effects (establishing a session, potentially switching user context). It doesn't simply read data or write content, but executes an authentication process. Misuse could lead to account switching or session hijacking in an AI context, making it medium severity.

From the tool's definition 'Trigger manual login flow for Microsoft Teams' and 'switch accounts' — initiates an external authentication/session operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

teams_login Rate-limited

teams_login stays usable, but rate-capped — a runaway agent can't fire it dozens of times 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_login": {
      "limits": [
        {
          "counter": "teams_login_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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_login

What does the teams_login tool do? +

Trigger manual login flow for Microsoft Teams. Use this if the session has expired or you need to switch accounts. It is categorised as a Execute tool in the Teams MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on teams_login? +

Register the Teams MCP Server MCP server in PolicyLayer and add a rule for teams_login: 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_login? +

teams_login is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit teams_login? +

Yes. Add a rate_limit block to the teams_login 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_login completely? +

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

teams_login 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.