wa_send_reaction

React to a message with an emoji. Send an empty string emoji to remove a reaction.

SERVERWA MCP SOURCEdelltrak/wamcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/delltrak-wamcp/wa-send-reaction.md

WHAT IT DOES

What wa_send_reaction does on WA MCP

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

RISK

Why wa_send_reaction is rated Medium

Adding or removing emoji reactions are reversible modifications to message metadata. The action creates or modifies data (reaction state) without deleting core content or executing arbitrary code. This fits the Write category. Severity is medium because while reactions are non-destructive and low-impact individually, automated mass reactions or spam could degrade user experience or enable harassment campaigns.

From the tool's definition Tool description states 'React to a message with an emoji' and 'Send an empty string emoji to remove a reaction.' This modifies message state (adding or removing reactions) reversibly.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs wa_send_reaction safely

PolicyLayer is an MCP gateway: it sits between your AI agents and WA MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For wa_send_reaction, this is the rule to start with:

wa_send_reaction Rate-limited

wa_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": {
    "wa_send_reaction": {
      "limits": [
        {
          "counter": "wa_send_reaction_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect WA MCP, apply this rule, and every wa_send_reaction call is checked against it from then on.

FAQ

Questions about wa_send_reaction

What does the wa_send_reaction tool do? +

React to a message with an emoji. Send an empty string emoji to remove a reaction. It is categorised as a Write tool in the WA 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 wa_send_reaction? +

Register the WA MCP server in PolicyLayer and add a rule for wa_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 WA MCP. Nothing to install.

What risk level is wa_send_reaction? +

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

Can I rate-limit wa_send_reaction? +

Yes. Add a rate_limit block to the wa_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 wa_send_reaction completely? +

Set action: deny in the PolicyLayer policy for wa_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 wa_send_reaction? +

wa_send_reaction is provided by the WA MCP server (delltrak/wamcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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