add_chart · Keynote MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_chart does on Keynote MCP Server

AI agents use add_chart 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 add_chart needs a policy

This tool creates new content (a chart) within a presentation, which modifies the document state reversibly. Users can undo chart additions or delete charts afterwards. It is not destructive (irreversible deletion), not execute (arbitrary code/commands), not financial, and not a read operation. It falls squarely within Write category as a content creation operation.

From the tool's definition Tool name 'add_chart' and description 'Adds a chart to a slide' indicate creation of a new object within a presentation document.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_chart Rate-limited

add_chart 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": {
    "add_chart": {
      "limits": [
        {
          "counter": "add_chart_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 add_chart

What does the add_chart tool do? +

Adds a chart to a slide. Note: Keynote. 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 add_chart? +

Register the Keynote MCP Server MCP server in PolicyLayer and add a rule for add_chart: 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 add_chart? +

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

Can I rate-limit add_chart? +

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

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

add_chart 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.