# Registry

Read and write the Windows Registry. Keywords: regedit, registry key, HKEY, HKCU, HKLM, Windows settings, registry value. Use mode=

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

## Facts

- Tool: `Registry`
- Server: Windows-MCP (`13888285815/windows-mcp`) — https://policylayer.com/tools/13888285815-windows-mcp.md
- Homepage: https://github.com/13888285815/windows-mcp
- Risk category: Write (Medium 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": "Registry",
    "arguments": {}
  }
}
```

## Why Registry is rated Medium

While the tool supports both read and write operations, the write capability to the Windows Registry is the most significant risk. Registry modifications can alter system settings, security policies, application configurations, and user preferences globally. Though reversible (not Destructive), misconfigured writes could degrade system stability or enable lateral privilege escalation.

From the tool's own definition: "Tool description explicitly states 'Read and write the Windows Registry' and mentions registry modification keywords like 'regedit, registry key, HKEY, HKCU, HKLM, Windows settings, registry value.' The 'write' capability is directly stated."

## Use case

AI agents use Registry to create or update resources in Windows-MCP, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Windows-MCP environment.

## 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": {
    "Registry": {
      "limits": [
        {
          "counter": "registry_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Windows-MCP (17)

- `FileSystem` — Destructive — https://policylayer.com/tools/13888285815-windows-mcp/filesystem.md
- `App` — Execute — https://policylayer.com/tools/13888285815-windows-mcp/app.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

## 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`

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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