React to message with emoji (auto-detects sender). Args: emoji, to_message_id, phone, instance_name. Returns: confirmation.
AI agents use react_with to create or update resources in Automagik Tools — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Automagik Tools environment.
This tool sends an emoji reaction to an existing message. It creates a new reaction (a reversible, low-impact write action) but does not delete or modify content. The blast radius is minimal — misuse would at worst send an unintended emoji reaction.
From the tool's definition React to message with emoji (auto-detects sender)
Documented attack patterns abuse exactly the kind of access react_with gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Automagik Tools, and nothing reaches the server without passing your rules. This is the rule we recommend for react_with:
{
"version": "1",
"default": "deny",
"tools": {
"react_with": {
"limits": [
{
"counter": "react_with_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}react_with 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.
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React to message with emoji (auto-detects sender). Args: emoji, to_message_id, phone, instance_name. Returns: confirmation. It is categorised as a Write tool in the Automagik Tools MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Automagik Tools MCP server in PolicyLayer and add a rule for react_with: 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 Automagik Tools. Nothing to install.
react_with is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the react_with 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.
Set action: deny in the PolicyLayer policy for react_with. 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.
react_with is provided by the Automagik Tools MCP server (namastexlabs/automagik-tools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Automagik Tools, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
122 Automagik Tools tools catalogued and risk-classified — across an index of 43,000+ MCP servers.