# phone.normalize

E.164-normalize and classify a phone number using libphonenumber. Returns format variants (E.164, international, national, RFC3966) plus type (mobile, fixed_line, voip, premium_rate, toll_free, etc.) and region.

Agent View of the PolicyLayer registry record for `phone.normalize`. HTML page: https://policylayer.com/tools/io-github-2s-io-mcp/phone.normalize

## Facts

- Tool: `phone.normalize`
- Server: Mcp (`@2sio/mcp`) — https://policylayer.com/tools/io-github-2s-io-mcp.md
- Install: `npx -y @2sio/mcp`
- Homepage: https://github.com/2s-io/sdk
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

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

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

## Why phone.normalize is rated Low

This tool retrieves and transforms metadata about a phone number using libphonenumber library—it parses, formats, and classifies input to return standardized representations and attributes. No data is created, modified, deleted, or executed. The tool has no side effects and produces only informational output. It is a pure read/analysis operation with minimal security risk if misused.

From the tool's own definition: "Tool description states it 'E.164-normalize and classify a phone number' and 'Returns format variants...plus type...and region.' The verb is 'normalize and classify' which are read operations that analyze and format input without modifying stored data or…"

## Use case

AI agents call phone.normalize to retrieve information from Mcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

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

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "phone.normalize": {}
  }
}
```

## Other tools on Mcp (571)

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- `store.kv-delete` — Destructive — https://policylayer.com/tools/io-github-2s-io-mcp/store.kv-delete.md
- `store.vector-delete` — Destructive — https://policylayer.com/tools/io-github-2s-io-mcp/store.vector-delete.md
- `watchers.cancel` — Destructive — https://policylayer.com/tools/io-github-2s-io-mcp/watchers.cancel.md
- `ai.council` — Execute — https://policylayer.com/tools/io-github-2s-io-mcp/ai.council.md
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- …and 541 more: https://policylayer.com/tools/io-github-2s-io-mcp.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=io-github-2s-io-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-2s-io-mcp