send_to_all · MCP Reminder Service MCP: Risk & Policy

WHAT IT DOES

What send_to_all does on MCP Reminder Service

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

WHY IT NEEDS A POLICY

Why send_to_all needs a policy

This tool creates and sends messages to multiple platforms simultaneously. While it modifies state (messages are sent and logged), it does not execute arbitrary code, delete data, or move money. The 'medium' severity reflects the blast radius of sending unsolicited or malicious messages to all configured platforms and users, which could constitute spam or social engineering.

From the tool's definition Tool name 'send_to_all' combined with description '向所有配置的平台发送消息' (send message to all configured platforms) indicates creation of messages across multiple channels (Telegram, Feishu). This is a write operation that creates/transmits data.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_to_all Rate-limited

send_to_all 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_to_all": {
      "limits": [
        {
          "counter": "send_to_all_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 Reminder Service, so you can run agents against it safely.

FAQ

Questions about send_to_all

What does the send_to_all tool do? +

向所有配置的平台发送消息. It is categorised as a Write tool in the MCP Reminder Service 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_to_all? +

Register the MCP Reminder Service MCP server in PolicyLayer and add a rule for send_to_all: 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 Reminder Service. Nothing to install.

What risk level is send_to_all? +

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

Can I rate-limit send_to_all? +

Yes. Add a rate_limit block to the send_to_all 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_to_all completely? +

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

send_to_all is provided by the MCP Reminder Service MCP server (xiaohui/mcp_reminder). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.