# App

Open/start/launch applications and manage windows. Keywords: open, start, launch, program, application, window, foreground, focus, resize. Three modes:

Agent View of the PolicyLayer registry record for `App`. HTML page: https://policylayer.com/tools/13888285815-windows-mcp/app

## Facts

- Tool: `App`
- Server: Windows-MCP (`13888285815/windows-mcp`) — https://policylayer.com/tools/13888285815-windows-mcp.md
- Homepage: https://github.com/13888285815/windows-mcp
- Risk category: Execute (High risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "App",
    "arguments": {}
  }
}
```

## Why App is rated High

The App tool triggers external operations (application launches and window management) whose effects depend on which application is specified as an argument. This is Execute-category behavior—similar to shell command execution or process spawning. While not inherently destructive, launching applications can have significant side effects (network calls, file modifications, credential access).

From the tool's own definition: "Tool description states it can 'Open/start/launch applications and manage windows' with keywords including 'open, start, launch, program, application'. The ability to launch arbitrary applications on a Windows system represents code/process execution."

## Use case

AI agents invoke App to trigger actions in Windows-MCP. 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.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Windows-MCP:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "App": {
      "limits": [
        {
          "counter": "app_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Windows-MCP (17)

- `FileSystem` — Destructive — https://policylayer.com/tools/13888285815-windows-mcp/filesystem.md
- `Click` — Execute — https://policylayer.com/tools/13888285815-windows-mcp/click.md
- `MultiEdit` — Execute — https://policylayer.com/tools/13888285815-windows-mcp/multiedit.md
- `MultiSelect` — Execute — https://policylayer.com/tools/13888285815-windows-mcp/multiselect.md
- `PowerShell` — Execute — https://policylayer.com/tools/13888285815-windows-mcp/powershell.md
- `Scroll` — Execute — https://policylayer.com/tools/13888285815-windows-mcp/scroll.md
- `Shortcut` — Execute — https://policylayer.com/tools/13888285815-windows-mcp/shortcut.md
- `Type` — Execute — https://policylayer.com/tools/13888285815-windows-mcp/type.md
- `Wait` — Execute — https://policylayer.com/tools/13888285815-windows-mcp/wait.md
- `Clipboard` — Read — https://policylayer.com/tools/13888285815-windows-mcp/clipboard.md
- `Process` — Read — https://policylayer.com/tools/13888285815-windows-mcp/process.md
- `Scrape` — Read — https://policylayer.com/tools/13888285815-windows-mcp/scrape.md
- `Screenshot` — Read — https://policylayer.com/tools/13888285815-windows-mcp/screenshot.md
- `Snapshot` — Read — https://policylayer.com/tools/13888285815-windows-mcp/snapshot.md
- `Move` — Write — https://policylayer.com/tools/13888285815-windows-mcp/move.md
- `Notification` — Write — https://policylayer.com/tools/13888285815-windows-mcp/notification.md
- `Registry` — Write — https://policylayer.com/tools/13888285815-windows-mcp/registry.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=13888285815-windows-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/13888285815-windows-mcp