set_slide_background_image · Keynote MCP Server MCP

WHAT IT DOES

What set_slide_background_image does on Keynote MCP Server

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

WHY IT NEEDS A POLICY

Why set_slide_background_image needs a policy

This tool modifies presentation state by changing slide visual properties (background image), which is a reversible write operation. It does not execute arbitrary code, delete data, or move money. The severity is medium because misuse could corrupt a presentation's visual layout, but the effect is easily undone via undo functionality or re-opening without saving. Confidence is high as the intent is unambiguous.

From the tool's definition Tool description states it 'Sets an image file as the background of a slide', which is a modification operation. The sibling tools (add_slide, add_text_item, add_chart, etc.) are clearly in the Write category as they create/modify presentation content.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_slide_background_image Rate-limited

set_slide_background_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": {
    "set_slide_background_image": {
      "limits": [
        {
          "counter": "set_slide_background_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 Keynote MCP Server, so you can run agents against it safely.

FAQ

Questions about set_slide_background_image

What does the set_slide_background_image tool do? +

Sets an image file as the background of a slide. The image file must be accessible on the local filesystem. It is categorised as a Write tool in the Keynote 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 set_slide_background_image? +

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

What risk level is set_slide_background_image? +

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

Can I rate-limit set_slide_background_image? +

Yes. Add a rate_limit block to the set_slide_background_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 set_slide_background_image completely? +

Set action: deny in the PolicyLayer policy for set_slide_background_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 set_slide_background_image? +

set_slide_background_image is provided by the Keynote MCP Server MCP server (superdwayne/keynotemp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.