hold_key

Hold a keyboard key for a duration in milliseconds, then release it.

SERVERMcp Control Plane SOURCEalbertik322-sudo/mcp-control-plane

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/mcp-control-plane/hold-key.md

WHAT IT DOES

What hold_key does on Mcp Control Plane

AI agents invoke hold_key to trigger actions in Mcp Control Plane. 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 hold_key is rated High

This tool triggers a keyboard input action on the system — an external operation that sends keystrokes to whatever window/application is active. It can be misused to trigger shortcuts, enter text, or manipulate UI elements in unpredictable ways, making it Execute category. Severity is medium because the blast radius depends on context but could affect active applications or system state.

From the tool's definition Hold a keyboard key for a duration in milliseconds, then release it.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs hold_key safely

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

hold_key Rate-limited

hold_key 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": {
    "hold_key": {
      "limits": [
        {
          "counter": "hold_key_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 Mcp Control Plane, apply this rule, and every hold_key call is checked against it from then on.

FAQ

Questions about hold_key

What does the hold_key tool do? +

Hold a keyboard key for a duration in milliseconds, then release it. It is categorised as a Execute tool in the Mcp Control Plane MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on hold_key? +

Register the Mcp Control Plane MCP server in PolicyLayer and add a rule for hold_key: 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 Mcp Control Plane. Nothing to install.

What risk level is hold_key? +

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

Can I rate-limit hold_key? +

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

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

hold_key is provided by the Mcp Control Plane MCP server (albertik322-sudo/mcp-control-plane). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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