props_set

Update a specific prop

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/props-set.md

WHAT IT DOES

What props_set does on Propresenter

AI agents use props_set 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 props_set is rated Medium

This tool modifies presentation props in ProPresenter 7, which is a write operation that changes state but is not destructive (can be undone/reverted). The severity is medium because incorrect prop updates could disrupt a presentation, but the blast radius is limited to visual/presentation elements rather than system-level or financial impacts.

From the tool's definition Tool name 'props_set' and description 'Update a specific prop' indicate data modification capability. The action is reversible (not deletion/destructive), and no code execution or financial operation is involved.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs props_set 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 props_set, this is the rule to start with:

props_set Rate-limited

props_set 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": {
    "props_set": {
      "limits": [
        {
          "counter": "props_set_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 props_set call is checked against it from then on.

FAQ

Questions about props_set

What does the props_set tool do? +

Update a specific prop. 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 props_set? +

Register the Propresenter MCP server in PolicyLayer and add a rule for props_set: 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 props_set? +

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

Can I rate-limit props_set? +

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

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

props_set 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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