postevent · Revel Digital MCP Server MCP: Risk & Policy

WHAT IT DOES

What postevent does on Revel Digital MCP Server

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

WHY IT NEEDS A POLICY

Why postevent needs a policy

This tool creates new event records associated with devices in the digital signage infrastructure. Creating events is a reversible write operation—events can be deleted or modified later. While it modifies the system state, it does not execute arbitrary code, trigger financial transactions, or irreversibly destroy data.

From the tool's definition Tool name 'postevent' and description 'Create an event associated with a device' indicate a create operation that adds new data to the system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

postevent Rate-limited

postevent 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": {
    "postevent": {
      "limits": [
        {
          "counter": "postevent_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 Revel Digital MCP Server, so you can run agents against it safely.

FAQ

Questions about postevent

What does the postevent tool do? +

Create an event associated with a device. It is categorised as a Write tool in the Revel Digital 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 postevent? +

Register the Revel Digital MCP Server MCP server in PolicyLayer and add a rule for postevent: 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 Revel Digital MCP Server. Nothing to install.

What risk level is postevent? +

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

Can I rate-limit postevent? +

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

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

postevent is provided by the Revel Digital MCP Server MCP server (reveldigital/reveldigital-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.