update_text_item · Keynote MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_text_item does on Keynote MCP Server

AI agents use update_text_item 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 update_text_item needs a policy

This tool modifies existing slide content reversibly. While it changes data, the modification is not destructive (text can be edited again or undone), placing it in the Write category. Severity is medium because misuse could corrupt presentation content, but the impact is localized to a single text element and fully reversible.

From the tool's definition Tool description states it 'Updates the text content of an existing text item on a slide' — a reversible modification operation. The broader server context confirms this is part of a presentation editing suite with create/edit/export capabilities.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_text_item Rate-limited

update_text_item 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": {
    "update_text_item": {
      "limits": [
        {
          "counter": "update_text_item_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 update_text_item

What does the update_text_item tool do? +

Updates the text content of an existing text item on a slide. 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 update_text_item? +

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

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

Can I rate-limit update_text_item? +

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

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

update_text_item 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.