# qt_set_property

Set a Qt property on a widget.

Agent View of the PolicyLayer registry record for `qt_set_property`. HTML page: https://policylayer.com/tools/0xcarbon-qt-mcp/qt-set-property

## Facts

- Tool: `qt_set_property`
- Server: Qt (`0xcarbon/qt-mcp`) — https://policylayer.com/tools/0xcarbon-qt-mcp.md
- Homepage: https://github.com/0xCarbon/qt-mcp
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "qt_set_property",
    "arguments": {}
  }
}
```

## 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 own 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."

## Use case

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.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Qt:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "qt_set_property": {
      "limits": [
        {
          "counter": "qt_set_property_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Qt (23)

- `qt_batch` — Execute — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-batch.md
- `qt_click` — Execute — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-click.md
- `qt_invoke_slot` — Execute — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-invoke-slot.md
- `qt_key_press` — Execute — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-key-press.md
- `qt_trigger_action` — Execute — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-trigger-action.md
- `qt_type` — Execute — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-type.md
- `qt_wait_for` — Execute — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-wait-for.md
- `qt_active_popup` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-active-popup.md
- `qt_find_widget` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-find-widget.md
- `qt_get_text` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-get-text.md
- `qt_layout_check` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-layout-check.md
- `qt_list_windows` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-list-windows.md
- `qt_menu_items` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-menu-items.md
- `qt_messages` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-messages.md
- `qt_object_tree` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-object-tree.md
- `qt_scene_snapshot` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-scene-snapshot.md
- `qt_screenshot` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-screenshot.md
- `qt_signals` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-signals.md
- `qt_snapshot` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-snapshot.md
- `qt_thread_check` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-thread-check.md
- `qt_vtk_scene_info` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-vtk-scene-info.md
- `qt_vtk_screenshot` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-vtk-screenshot.md
- `qt_widget_details` — Read — https://policylayer.com/tools/0xcarbon-qt-mcp/qt-widget-details.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=0xcarbon-qt-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/0xcarbon-qt-mcp