qt_set_property

Set a Qt property on a widget.

SERVERQt SOURCE0xcarbon/qt-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/0xcarbon-qt-mcp/qt-set-property.md

WHAT IT DOES

What qt_set_property does on Qt

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

RISK

Why qt_set_property is rated Medium

The tool modifies widget properties, which is a state change but not destructive or irreversible. It does not execute arbitrary code, delete data, or move money. The severity is medium because unintended property modifications could alter application behavior or user experience, but changes are typically reversible (e.g., resetting property values).

From the tool's definition Tool name 'qt_set_property' and description 'Set a Qt property on a widget' indicate modification of widget state/properties. This is a reversible write operation on UI element attributes.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs qt_set_property safely

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

qt_set_property Rate-limited

qt_set_property 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": {
    "qt_set_property": {
      "limits": [
        {
          "counter": "qt_set_property_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 Qt, apply this rule, and every qt_set_property call is checked against it from then on.

FAQ

Questions about qt_set_property

What does the qt_set_property tool do? +

Set a Qt property on a widget. It is categorised as a Write tool in the Qt MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on qt_set_property? +

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

What risk level is qt_set_property? +

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

Can I rate-limit qt_set_property? +

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

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

qt_set_property is provided by the Qt MCP server (0xcarbon/qt-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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