computer_left_click · Computer Use MCP Server MCP

WHAT IT DOES

What computer_left_click does on Computer Use MCP Server

AI agents invoke computer_left_click to trigger actions in Computer Use MCP Server. 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_left_click needs a policy

Clicking a mouse button is an action that executes arbitrary UI operations on the desktop. The effect depends entirely on what element is at the given coordinates — it could submit forms, open applications, confirm dialogs, or trigger destructive actions.

From the tool's definition 'Click the left mouse button at the given coordinates' — triggers UI interactions on a live desktop that can activate buttons, links, menus, or any interactive element depending on what is on screen.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

computer_left_click Rate-limited

computer_left_click 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_left_click": {
      "limits": [
        {
          "counter": "computer_left_click_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 Computer Use MCP Server, so you can run agents against it safely.

FAQ

Questions about computer_left_click

What does the computer_left_click tool do? +

Click the left mouse button at the given coordinates. It is categorised as a Execute tool in the Computer Use MCP Server 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_left_click? +

Register the Computer Use MCP Server MCP server in PolicyLayer and add a rule for computer_left_click: 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 Computer Use MCP Server. Nothing to install.

What risk level is computer_left_click? +

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

Can I rate-limit computer_left_click? +

Yes. Add a rate_limit block to the computer_left_click 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_left_click completely? +

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

computer_left_click is provided by the Computer Use MCP Server MCP server (sebastianbaltes/claude_code_computer_use_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.