update-media · Mcp Dev MCP: Risk & Policy

WHAT IT DOES

What update-media does on Mcp Dev

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

WHY IT NEEDS A POLICY

Why update-media needs a policy

This tool creates or modifies data reversibly (falls under Write category). It operates on media items in Umbraco CMS by updating properties. The severity is medium because unintended updates to media metadata could cause operational issues or corrupt asset references, but the impact is limited to individual media items and is reversible.

From the tool's definition Tool name is "update-media" and description states it "Updates a media item by Id" — a reversible modification operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update-media Rate-limited

update-media 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": {
    "update-media": {
      "limits": [
        {
          "counter": "update-media_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 Mcp Dev, so you can run agents against it safely.

FAQ

Questions about update-media

What does the update-media tool do? +

Updates a media item by Id. Works for all media types including folders, images, files, videos, etc. Always read the current media value first and only update the required values. Don. It is categorised as a Write tool in the Mcp Dev MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update-media? +

Register the Mcp Dev MCP server in PolicyLayer and add a rule for update-media: 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 Mcp Dev. Nothing to install.

What risk level is update-media? +

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

Can I rate-limit update-media? +

Yes. Add a rate_limit block to the update-media 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 update-media completely? +

Set action: deny in the PolicyLayer policy for update-media. 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 update-media? +

update-media is provided by the Mcp Dev MCP server (@umbraco-cms/mcp-dev). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.