keynote_set_element_size · Keynote MCP: Risk & Policy

WHAT IT DOES

What keynote_set_element_size does on Keynote

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

WHY IT NEEDS A POLICY

Why keynote_set_element_size needs a policy

This tool modifies presentation slide elements by changing their dimensions, which is a reversible write operation. It does not delete data (Destructive), execute arbitrary code (Execute), move money (Financial), or trigger external side effects beyond the presentation itself.

From the tool's definition Tool description states it can 'Resize an element on the slide', which is a modification operation. The sibling tools include destructive operations (keynote_delete_element, keynote_delete_slide) and write operations (keynote_add_shape, keynote_add_text_box,…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

keynote_set_element_size Rate-limited

keynote_set_element_size 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": {
    "keynote_set_element_size": {
      "limits": [
        {
          "counter": "keynote_set_element_size_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, so you can run agents against it safely.

FAQ

Questions about keynote_set_element_size

What does the keynote_set_element_size tool do? +

Resize an element on the slide. Dimensions are in points. It is categorised as a Write tool in the Keynote MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on keynote_set_element_size? +

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

What risk level is keynote_set_element_size? +

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

Can I rate-limit keynote_set_element_size? +

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

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

keynote_set_element_size is provided by the Keynote MCP server (tszaks/keynote-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.