patchmedia · Revel Digital MCP Server MCP: Risk & Policy

WHAT IT DOES

What patchmedia does on Revel Digital MCP Server

AI agents use patchmedia 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 patchmedia needs a policy

The tool modifies an existing media item using JSON Patch for partial updates. This is a reversible write operation (properties can be re-patched to original values), not destructive deletion. Severity is medium because misconfigured media items could affect digital signage displays across infrastructure, but changes are reversible.

From the tool's definition 'Patch a media item. Patch allows partial updates by targeting specific properties' — partial/reversible modification of an existing media item

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

patchmedia Rate-limited

patchmedia 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": {
    "patchmedia": {
      "limits": [
        {
          "counter": "patchmedia_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 patchmedia

What does the patchmedia tool do? +

Patch a media item. Patch allows partial updates by targeting specific properties of the schedule. Uses the JSON Patch syntax (http://jsonpatch.com). 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 patchmedia? +

Register the Revel Digital MCP Server MCP server in PolicyLayer and add a rule for patchmedia: 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 patchmedia? +

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

Can I rate-limit patchmedia? +

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

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

patchmedia 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.