# no_portscan

Perform host discovery without port scanning on the specified target with optional custom arguments.

Agent View of the PolicyLayer registry record for `no_portscan`. HTML page: https://policylayer.com/tools/0xpratikpatil-nmapmcp/no-portscan

## Facts

- Tool: `no_portscan`
- Server: NmapMCP (`0xpratikpatil/nmapmcp`) — https://policylayer.com/tools/0xpratikpatil-nmapmcp.md
- Homepage: https://github.com/0xPratikPatil/NmapMCP
- 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": "no_portscan",
    "arguments": {}
  }
}
```

## Why no_portscan is rated High

This tool performs active network reconnaissance (host discovery) against a specified target. While it doesn't scan ports, it still executes outbound network probes to discover live hosts. This is an external operation whose effects depend on the target argument, fitting the Execute category. Misuse could facilitate unauthorized reconnaissance of networks, hence medium severity.

From the tool's own definition: "'Perform host discovery without port scanning on the specified target' — actively probes/scans a network target, triggering external network operations"

## Use case

AI agents invoke no_portscan to trigger actions in NmapMCP. 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 NmapMCP:

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

## Other tools on NmapMCP (14)

- `arp_discovery` — Execute — https://policylayer.com/tools/0xpratikpatil-nmapmcp/arp-discovery.md
- `disable_dns_resolution` — Execute — https://policylayer.com/tools/0xpratikpatil-nmapmcp/disable-dns-resolution.md
- `dns_brute_force` — Execute — https://policylayer.com/tools/0xpratikpatil-nmapmcp/dns-brute-force.md
- `fin_scan` — Execute — https://policylayer.com/tools/0xpratikpatil-nmapmcp/fin-scan.md
- `idle_scan` — Execute — https://policylayer.com/tools/0xpratikpatil-nmapmcp/idle-scan.md
- `os_detection` — Execute — https://policylayer.com/tools/0xpratikpatil-nmapmcp/os-detection.md
- `ping_scan` — Execute — https://policylayer.com/tools/0xpratikpatil-nmapmcp/ping-scan.md
- `portscan_only` — Execute — https://policylayer.com/tools/0xpratikpatil-nmapmcp/portscan-only.md
- `scan_top_ports` — Execute — https://policylayer.com/tools/0xpratikpatil-nmapmcp/scan-top-ports.md
- `syn_scan` — Execute — https://policylayer.com/tools/0xpratikpatil-nmapmcp/syn-scan.md
- `tcp_scan` — Execute — https://policylayer.com/tools/0xpratikpatil-nmapmcp/tcp-scan.md
- `udp_scan` — Execute — https://policylayer.com/tools/0xpratikpatil-nmapmcp/udp-scan.md
- `version_detection` — Execute — https://policylayer.com/tools/0xpratikpatil-nmapmcp/version-detection.md
- `list_scan` — Read — https://policylayer.com/tools/0xpratikpatil-nmapmcp/list-scan.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=0xpratikpatil-nmapmcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/0xpratikpatil-nmapmcp