messages_update

Update an existing message

SERVERPropresenter SOURCE@alxpark/propresenter-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-alxpark-propresenter-mcp/messages-update.md

WHAT IT DOES

What messages_update does on Propresenter

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

RISK

Why messages_update is rated Medium

This tool creates or modifies data (a message) in a reversible way, fitting the Write category definition. The severity is medium because updating messages in a presentation control system could affect displayed content to an audience, but the action is not destructive (reversible) or financial. Confidence is high based on clear evidence from the name and description.

From the tool's definition Tool name 'messages_update' and description 'Update an existing message' indicate modification of existing data in a reversible manner.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs messages_update safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Propresenter, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For messages_update, this is the rule to start with:

messages_update Rate-limited

messages_update 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": {
    "messages_update": {
      "limits": [
        {
          "counter": "messages_update_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Propresenter, apply this rule, and every messages_update call is checked against it from then on.

FAQ

Questions about messages_update

What does the messages_update tool do? +

Update an existing message. It is categorised as a Write tool in the Propresenter MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on messages_update? +

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

What risk level is messages_update? +

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

Can I rate-limit messages_update? +

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

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

messages_update is provided by the Propresenter MCP server (@alxpark/propresenter-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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