# free_email_pattern (/docs/mcp/free-tools/free-email-pattern)

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**Free email format lookup** · Read-only

Free on every plan of a signed-in account, also after the trial ends, no credits used. Works out the email format a company uses from up to 50 known contacts at that domain. Returns pattern (e.g. \{first\}.\{last\}, \{f\}\{last\}, \{first\}), an example with a placeholder name (jane.doe@domain), confidence (share of sampled contacts that match, as a percent string), sampledFrom and allPatterns with counts. pattern is null when there are no contacts or no recognisable format. Free tools share a limit of 10 calls per account per UTC day (resets 00:00 UTC; past it the call returns 429).

| Connection | Account URL, team member URL or OAuth |
| --- | --- |

## Parameters [#parameters]

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `domain` | `string` | Yes | Company domain without protocol, e.g. stripe.com. |

## Tool definition [#tool-definition]

What your assistant receives from `tools/list`:

```json
{
  "name": "free_email_pattern",
  "title": "Free email format lookup",
  "annotations": {
    "title": "Free email format lookup",
    "readOnlyHint": true,
    "destructiveHint": false,
    "idempotentHint": true,
    "openWorldHint": false
  },
  "inputSchema": {
    "type": "object",
    "properties": {
      "domain": {
        "type": "string",
        "description": "Company domain without protocol, e.g. stripe.com."
      }
    },
    "required": [
      "domain"
    ]
  }
}
```