computer_paste_text · LocalAnt MCP: Risk & Policy

WHAT IT DOES

What computer_paste_text does on LocalAnt

AI agents invoke computer_paste_text to trigger actions in LocalAnt. 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.

WHY IT NEEDS A POLICY

Why computer_paste_text needs a policy

This tool performs an active UI interaction by manipulating the system clipboard and simulating a keyboard shortcut (Cmd+V). This constitutes a browser/desktop automation action that executes an operation on the host system. Misuse could inject arbitrary text into any focused application (documents, terminals, code editors), potentially leading to command injection or data corruption.

From the tool's definition 'Put text on the clipboard and paste it with Cmd+V' — triggers an external keyboard/UI action on the host PC

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

computer_paste_text Rate-limited

computer_paste_text 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": {
    "computer_paste_text": {
      "limits": [
        {
          "counter": "computer_paste_text_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches LocalAnt, so you can run agents against it safely.

FAQ

Questions about computer_paste_text

What does the computer_paste_text tool do? +

Put text on the clipboard and paste it with Cmd+V (faster and more reliable than computer_type. It is categorised as a Execute tool in the LocalAnt MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on computer_paste_text? +

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

What risk level is computer_paste_text? +

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

Can I rate-limit computer_paste_text? +

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

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

computer_paste_text is provided by the LocalAnt MCP server (yuga-hashimoto/localant). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.