send_text · Evolution API WhatsApp MCP Server MCP

WHAT IT DOES

What send_text does on Evolution API WhatsApp MCP Server

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

WHY IT NEEDS A POLICY

Why send_text needs a policy

This tool creates new message records and delivers communications, making it a Write action (creates/modifies data reversibly). Severity is medium because misuse could spam contacts, send phishing messages, or impersonate the business, but messages themselves are not destructive and can be contextually managed.

From the tool's definition Tool named 'send_text' with description 'Send a text message' on a WhatsApp Business messaging server. The Evolution API documentation context indicates this creates/modifies communication data by delivering messages to contacts or groups.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_text Rate-limited

send_text 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": {
      "limits": [
        {
          "counter": "send_text_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 Evolution API WhatsApp MCP Server, so you can run agents against it safely.

FAQ

Questions about send_text

What does the send_text tool do? +

Send a text message. It is categorised as a Write tool in the Evolution API WhatsApp 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 send_text? +

Register the Evolution API WhatsApp MCP Server MCP server in PolicyLayer and add a rule for send_text: 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 Evolution API WhatsApp MCP Server. Nothing to install.

What risk level is send_text? +

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

Can I rate-limit send_text? +

Yes. Add a rate_limit block to the send_text 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 completely? +

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

send_text is provided by the Evolution API WhatsApp MCP Server MCP server (luiso2/mcp-evolution-api). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.