send_text_message · MCP Commute Assistant MCP: Risk & Policy

WHAT IT DOES

What send_text_message does on MCP Commute Assistant

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

WHY IT NEEDS A POLICY

Why send_text_message needs a policy

This tool writes/creates data (a new message) in a reversible manner. The message can be deleted or edited after sending. It does not permanently destroy data, execute arbitrary code, or move money. The medium severity reflects potential misuse scenarios such as spam, harassment, or spreading misinformation to group chats, which have moderate blast radius but are not as severe as destructive or financial actions.

From the tool's definition Tool name 'send_text_message' and description '发送文本消息到钉钉群' (send text message to DingTalk group) indicate the tool creates and posts a message to an external messaging platform.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_text_message Rate-limited

send_text_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": {
    "send_text_message": {
      "limits": [
        {
          "counter": "send_text_message_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 MCP Commute Assistant, so you can run agents against it safely.

FAQ

Questions about send_text_message

What does the send_text_message tool do? +

发送文本消息到钉钉群. It is categorised as a Write tool in the MCP Commute Assistant MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on send_text_message? +

Register the MCP Commute Assistant MCP server in PolicyLayer and add a rule for send_text_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 MCP Commute Assistant. Nothing to install.

What risk level is send_text_message? +

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

Can I rate-limit send_text_message? +

Yes. Add a rate_limit block to the send_text_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 send_text_message completely? +

Set action: deny in the PolicyLayer policy for send_text_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 send_text_message? +

send_text_message is provided by the MCP Commute Assistant MCP server (standup-coder/mcp4coder). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.