whatsapp_send_reaction · WSAPI WhatsApp MCP Server MCP

WHAT IT DOES

What whatsapp_send_reaction does on WSAPI WhatsApp MCP Server

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

WHY IT NEEDS A POLICY

Why whatsapp_send_reaction needs a policy

This tool modifies message reactions (adding or removing emojis), which constitutes a Write action—data is created or changed reversibly. While the individual action has low blast radius, the medium severity accounts for potential abuse at scale (spam reactions, harassment via automated reaction bombing on large groups, or impersonation scenarios where reactions could mislead other users about message sentiment or…

From the tool's definition Tool sends a reaction (emoji) to a message and can remove reactions by sending an empty string. These are reversible modifications to message metadata/state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

whatsapp_send_reaction Rate-limited

whatsapp_send_reaction 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": {
    "whatsapp_send_reaction": {
      "limits": [
        {
          "counter": "whatsapp_send_reaction_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches WSAPI WhatsApp MCP Server, so you can run agents against it safely.

FAQ

Questions about whatsapp_send_reaction

What does the whatsapp_send_reaction tool do? +

Send a reaction (emoji) to a message. Send empty string to remove reaction. It is categorised as a Write tool in the WSAPI 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 whatsapp_send_reaction? +

Register the WSAPI WhatsApp MCP Server MCP server in PolicyLayer and add a rule for whatsapp_send_reaction: 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 WSAPI WhatsApp MCP Server. Nothing to install.

What risk level is whatsapp_send_reaction? +

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

Can I rate-limit whatsapp_send_reaction? +

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

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

whatsapp_send_reaction is provided by the WSAPI WhatsApp MCP Server MCP server (wsapi-chat/wsapi-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.