qt_invoke_slot

Invoke a slot or method on a QObject.

SERVERQt SOURCE0xcarbon/qt-mcp

High RISK CLASS

Category Execute

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-invoke-slot.md

WHAT IT DOES

What qt_invoke_slot does on Qt

AI agents invoke qt_invoke_slot to trigger actions in Qt. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why qt_invoke_slot is rated High

This tool enables execution of arbitrary methods/slots on Qt objects, which is a form of code execution. Unlike Read operations (qt_get_text, qt_list_windows) or reversible Write operations (qt_click, qt_key_press which simulate user input), invoking a slot directly executes pre-defined code logic whose effects cannot be easily predicted or undone without knowing the specific slot implementation.

From the tool's definition The tool description states it can 'Invoke a slot or method on a QObject.' In PySide6, slots are callback mechanisms that execute arbitrary code in response to signals.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

qt_invoke_slot Rate-limited

qt_invoke_slot stays usable, but rate-capped: a runaway agent can't fire it dozens of times 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_invoke_slot": {
      "limits": [
        {
          "counter": "qt_invoke_slot_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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_invoke_slot call is checked against it from then on.

FAQ

Questions about qt_invoke_slot

What does the qt_invoke_slot tool do? +

Invoke a slot or method on a QObject. It is categorised as a Execute tool in the Qt MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on qt_invoke_slot? +

Register the Qt MCP server in PolicyLayer and add a rule for qt_invoke_slot: 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_invoke_slot? +

qt_invoke_slot is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit qt_invoke_slot? +

Yes. Add a rate_limit block to the qt_invoke_slot 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_invoke_slot completely? +

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

qt_invoke_slot 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.

KEEP EXPLORING

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