DEVELOPERS / DEVELOPERS

send_mail

Behavior, inputs, outputs and permissions for send_mail.

Reviewed · 2026-09-20 / Ridian

This reference is generated from the published tool contract.

Behavior and boundaries

Sends one plain-text email from an explicitly enabled Google or Microsoft account to external recipients. No drafts, HTML, attachments, mailbox reads, or delivery tracking. requestId must be unique for this intended email and reused unchanged on retries.

Permissions

Granted scopes, accounts, calendars and visibility rules limit access. Workspace administrators do not automatically gain access to other users’ accounts.

mail:send

Consent and boundaries

Input

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "accountId": {
      "type": "string",
      "minLength": 1
    },
    "requestId": {
      "type": "string",
      "minLength": 1,
      "maxLength": 128
    },
    "to": {
      "minItems": 1,
      "maxItems": 20,
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 320,
        "format": "email",
        "pattern": "^(?:[A-Za-z0-9_'+\\-]+\\.)*[A-Za-z0-9_'+\\-]*[A-Za-z0-9_+-]@(?:[A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
      }
    },
    "cc": {
      "maxItems": 20,
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 320,
        "format": "email",
        "pattern": "^(?:[A-Za-z0-9_'+\\-]+\\.)*[A-Za-z0-9_'+\\-]*[A-Za-z0-9_+-]@(?:[A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
      }
    },
    "bcc": {
      "maxItems": 20,
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 320,
        "format": "email",
        "pattern": "^(?:[A-Za-z0-9_'+\\-]+\\.)*[A-Za-z0-9_'+\\-]*[A-Za-z0-9_+-]@(?:[A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
      }
    },
    "subject": {
      "type": "string",
      "minLength": 1,
      "maxLength": 256
    },
    "textBody": {
      "type": "string",
      "minLength": 1,
      "maxLength": 20000
    }
  },
  "required": [
    "accountId",
    "requestId",
    "to",
    "subject",
    "textBody"
  ],
  "additionalProperties": false
}

Output

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "ok": {
      "type": "boolean",
      "const": true
    },
    "accepted": {
      "type": "boolean",
      "const": true
    },
    "idempotentReplay": {
      "type": "boolean"
    }
  },
  "required": [
    "ok",
    "accepted",
    "idempotentReplay"
  ],
  "additionalProperties": false
}

Errors and retries

Check the tool result for errors. Do not blindly retry writes after a timeout. Check the calendar state first.

Error handling