keynote_apply_master · Keynote MCP: Risk & Policy

WHAT IT DOES

What keynote_apply_master does on Keynote

AI agents use keynote_apply_master 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_apply_master needs a policy

This tool modifies presentation content by applying master slide templates to one or all slides. This is a reversible Write operation—the master can be changed again or reverted. While it affects presentation layout and design, it does not delete data (which would be Destructive), execute arbitrary code (Execute), or create new independent assets.

From the tool's definition Tool description states it 'Apply[s] a master slide' which modifies presentation styling. The context that 'Applying a blank master before color changes can help unlock the background' confirms this performs a reversible modification to slide design…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

keynote_apply_master Rate-limited

keynote_apply_master 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_apply_master": {
      "limits": [
        {
          "counter": "keynote_apply_master_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_apply_master

What does the keynote_apply_master tool do? +

Apply a master slide to one slide or all slides. Use keynote_get_presentation_info first to see available master names. Applying a blank master before color changes can help unlock the background. 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_apply_master? +

Register the Keynote MCP server in PolicyLayer and add a rule for keynote_apply_master: 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_apply_master? +

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

Can I rate-limit keynote_apply_master? +

Yes. Add a rate_limit block to the keynote_apply_master 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_apply_master completely? +

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

keynote_apply_master 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.