upload_media · WordPress MCP Server MCP: Risk & Policy

WHAT IT DOES

What upload_media does on WordPress MCP Server

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

WHY IT NEEDS A POLICY

Why upload_media needs a policy

The tool creates and stores new media assets in WordPress, which is a reversible write operation. While media files are added to the system, they can be deleted using delete_media (a sibling tool), making this a Write rather than Destructive action.

From the tool's definition Tool description states 'Upload a media file... to WordPress' and 'Returns the attachment ID', indicating creation of new media resources.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

upload_media Rate-limited

upload_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": {
    "upload_media": {
      "limits": [
        {
          "counter": "upload_media_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches WordPress MCP Server, so you can run agents against it safely.

FAQ

Questions about upload_media

What does the upload_media tool do? +

Upload a media file (image, video, PDF, etc.) to WordPress. Provide file data as base64-encoded string. Returns the attachment ID which can be used as featured_media on posts. It is categorised as a Write tool in the WordPress 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 upload_media? +

Register the WordPress MCP Server MCP server in PolicyLayer and add a rule for upload_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 WordPress MCP Server. Nothing to install.

What risk level is upload_media? +

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

Can I rate-limit upload_media? +

Yes. Add a rate_limit block to the upload_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 upload_media completely? +

Set action: deny in the PolicyLayer policy for upload_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 upload_media? +

upload_media is provided by the WordPress MCP Server MCP server (wolffcatskyy/wordpress-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.