ghost_upload_image · Ghost MCP: Risk & Policy

WHAT IT DOES

What ghost_upload_image does on Ghost

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

WHY IT NEEDS A POLICY

Why ghost_upload_image needs a policy

This tool creates and stores new data (image assets) on the Ghost platform, making it a Write operation rather than Read. While uploads are reversible (images can be deleted), the tool itself performs a create operation.

From the tool's definition Tool uploads an image file to Ghost and returns a hosted URL, creating new content/media assets in the system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ghost_upload_image Rate-limited

ghost_upload_image 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": {
    "ghost_upload_image": {
      "limits": [
        {
          "counter": "ghost_upload_image_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 Ghost, so you can run agents against it safely.

FAQ

Questions about ghost_upload_image

What does the ghost_upload_image tool do? +

Upload a local image file to Ghost and return the hosted URL. It is categorised as a Write tool in the Ghost MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on ghost_upload_image? +

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

What risk level is ghost_upload_image? +

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

Can I rate-limit ghost_upload_image? +

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

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

ghost_upload_image is provided by the Ghost MCP server (uppinote20/ghost-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.