vscode_check_file_open

THE RISK

Low Risk

Why vscode_check_file_open needs a policy

This tool performs a simple state inspection—checking whether a file is open—which is a read-only operation with no side effects. It does not create, modify, delete, or execute anything. The blast radius of misuse is minimal (information disclosure about editor state).

From the tool's definition Tool name 'vscode_check_file_open' and description 'Check if a file with the specified name is currently open in the editor' indicate a query operation that retrieves state information without modifying or executing anything.

Documented attack patterns abuse exactly the kind of access vscode_check_file_open gives an agent:

POLICY

How to control vscode_check_file_open

PolicyLayer is an MCP gateway — it sits between your AI agents and VSCode Automation MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for vscode_check_file_open:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "vscode_check_file_open": {}
  }
}

vscode_check_file_open is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register VSCode Automation MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

More VSCode Automation MCP tools

Destructive vscode_clear_console Clear captured console logs. Execute vscode_execute_command Execute a VSCode command programmatically. Use this to trigger any command available in th Execute vscode_execute_script Execute arbitrary JavaScript code in the VSCode window context (like DevTools console). Ha Execute vscode_go_to_definition Trigger Go to Definition (F12) on the current cursor position. Execute vscode_hover Hover over an element for a specified duration to trigger hover effects. Execute vscode_initialize Initialize the VSCode automation driver. This is called automatically on first tool use, b Execute vscode_trigger_completion Trigger IntelliSense/code completion (Ctrl+Space) and optionally wait for items. Execute vscode_trigger_hover Trigger hover on an element and optionally wait for tooltip to appear. Returns tooltip con

All 61 VSCode Automation MCP tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about vscode_check_file_open

What does the vscode_check_file_open tool do? +

Check if a file with the specified name is currently open in the editor. It is categorised as a Read tool in the VSCode Automation MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on vscode_check_file_open? +

Register the VSCode Automation MCP server in PolicyLayer and add a rule for vscode_check_file_open: 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 VSCode Automation MCP. Nothing to install.

What risk level is vscode_check_file_open? +

vscode_check_file_open is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit vscode_check_file_open? +

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

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

vscode_check_file_open is provided by the VSCode Automation MCP server (sukarth/vscode-automation-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every VSCode Automation MCP tool call.

Start from VSCode Automation MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →