send_message · Multi-Agent Communication Platform (MCP) MCP

WHAT IT DOES

What send_message does on Multi-Agent Communication Platform (MCP)

AI agents use send_message to create or update resources in Multi-Agent Communication Platform (MCP) — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Multi-Agent Communication Platform (MCP) environment.

WHY IT NEEDS A POLICY

Why send_message needs a policy

An AI agent can call send_message faster than any human can review — one bad instruction and it creates or modifies resources in Multi-Agent Communication Platform (MCP) by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_message Rate-limited

send_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_message": {
      "limits": [
        {
          "counter": "send_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 Multi-Agent Communication Platform (MCP), so you can run agents against it safely.

FAQ

Questions about send_message

What does the send_message tool do? +

send_message. It is categorised as a Write tool in the Multi-Agent Communication Platform (MCP) 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_message? +

Register the Multi-Agent Communication Platform (MCP) MCP server in PolicyLayer and add a rule for send_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 Multi-Agent Communication Platform (MCP). Nothing to install.

What risk level is send_message? +

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

Can I rate-limit send_message? +

Yes. Add a rate_limit block to the send_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_message completely? +

Set action: deny in the PolicyLayer policy for send_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_message? +

send_message is provided by the Multi-Agent Communication Platform (MCP) MCP server (thiagovictorino/chat-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.