react · Manifold MCP: Risk & Policy

WHAT IT DOES

What react does on Manifold

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

WHY IT NEEDS A POLICY

Why react needs a policy

Reacting to a market or comment is a reversible action that adds or modifies user-generated metadata (reaction counts, emoji indicators) without creating substantive content, deleting data, or triggering external operations. This fits the Write category as a minor data modification.

From the tool's definition Tool name 'react' and description 'React to a market or comment' indicate adding emoji reactions or similar non-data-modifying interactions to existing content.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

react Rate-limited

react 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": {
    "react": {
      "limits": [
        {
          "counter": "react_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 Manifold, so you can run agents against it safely.

FAQ

Questions about react

What does the react tool do? +

React to a market or comment. It is categorised as a Write tool in the Manifold MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on react? +

Register the Manifold MCP server in PolicyLayer and add a rule for react: 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 Manifold. Nothing to install.

What risk level is react? +

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

Can I rate-limit react? +

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

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

react is provided by the Manifold MCP server (manifold-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.