# MCP tool reference

1 callable tools.

Use tools/call at https://mcp.schedulerzero.com/mcp with the exact tool name and arguments below. The /tools/ paths in this view are documentation identifiers, not HTTP endpoints. Request execution is disabled for this reference.

Inputs are shown for personal API keys (bound) and for OAuth/delegated agents. Output schemas describe MCP structuredContent: native objects pass through; arrays, scalars and null use a data wrapper. Text content retains the native JSON result.

[Connect a client](/mcp/connect) · [Authentication and authorization](/authentication) · [Generated auth guide](/auth.md) · [Download tool catalog](/mcp-catalog.json) · [Agent documentation](/llms.txt)

## adopt_gmail_warmup_label

Adopts an existing Gmail S0 label as the inbox's warmup label.

When asked to reuse an already-created Gmail warmup label.

For non-Google inboxes.

Scopes: inbox:update, inbox:warmup_manage

Risk: write; confirmation: none; idempotency: required.

### Input schema (personal API key)

```json
{
  "type": "object",
  "properties": {
    "workspaceId": {
      "type": "string",
      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
      "format": "uuid"
    },
    "inboxId": {
      "type": "string",
      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
      "format": "uuid"
    }
  },
  "required": [
    "workspaceId",
    "inboxId"
  ],
  "patternProperties": {
    "^(?!(?:workspaceId|inboxId)$)[\\s\\S]*$": false
  },
  "additionalProperties": true,
  "propertyNames": {
    "type": "string",
    "enum": [
      "workspaceId",
      "inboxId"
    ]
  }
}
```

### Input schema (OAuth / delegated agent)

```json
{
  "type": "object",
  "properties": {
    "workspaceId": {
      "type": "string",
      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
      "format": "uuid"
    },
    "inboxId": {
      "type": "string",
      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
      "format": "uuid"
    }
  },
  "required": [
    "workspaceId",
    "inboxId"
  ],
  "patternProperties": {
    "^(?!(?:workspaceId|inboxId)$)[\\s\\S]*$": false
  },
  "additionalProperties": true,
  "propertyNames": {
    "type": "string",
    "enum": [
      "workspaceId",
      "inboxId"
    ]
  }
}
```

### Output schema (structuredContent)

```json
{
  "type": "object",
  "properties": {
    "connectionId": {
      "$ref": "#/$defs/OpaqueId"
    },
    "inboxId": {
      "type": "string",
      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
      "format": "uuid"
    },
    "provider": {
      "type": "string",
      "enum": [
        "google_workspace",
        "microsoft_365",
        "imap_smtp"
      ]
    },
    "emailAddress": {
      "$ref": "#/$defs/EmailAddress"
    },
    "state": {
      "type": "string",
      "enum": [
        "connected",
        "needs_reauthorization",
        "quarantined",
        "alert",
        "disconnected"
      ]
    },
    "grantedScopes": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/ShortText"
      }
    },
    "tokenExpiresAt": {
      "anyOf": [
        {
          "$ref": "#/$defs/UtcDateTimeEncoded"
        },
        {
          "type": "null"
        }
      ]
    },
    "watchExpiresAt": {
      "anyOf": [
        {
          "$ref": "#/$defs/UtcDateTimeEncoded"
        },
        {
          "type": "null"
        }
      ]
    },
    "credentialRefId": {
      "anyOf": [
        {
          "type": "string",
          "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
          "format": "uuid"
        },
        {
          "type": "null"
        }
      ]
    },
    "lastSyncAt": {
      "anyOf": [
        {
          "$ref": "#/$defs/UtcDateTimeEncoded"
        },
        {
          "type": "null"
        }
      ]
    }
  },
  "required": [
    "connectionId",
    "inboxId",
    "provider",
    "emailAddress",
    "state",
    "tokenExpiresAt",
    "watchExpiresAt",
    "credentialRefId",
    "lastSyncAt"
  ],
  "patternProperties": {
    "^(?!(?:connectionId|inboxId|provider|emailAddress|state|grantedScopes|tokenExpiresAt|watchExpiresAt|credentialRefId|lastSyncAt)$)[\\s\\S]*$": false
  },
  "additionalProperties": true,
  "propertyNames": {
    "type": "string",
    "enum": [
      "connectionId",
      "inboxId",
      "provider",
      "emailAddress",
      "state",
      "grantedScopes",
      "tokenExpiresAt",
      "watchExpiresAt",
      "credentialRefId",
      "lastSyncAt"
    ]
  },
  "$defs": {
    "OpaqueId": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512
    },
    "EmailAddress": {
      "type": "string",
      "minLength": 3,
      "maxLength": 320,
      "pattern": "^[^\\s@]+@[^\\s@]+\\.[^\\s@]+$"
    },
    "ShortText": {
      "type": "string",
      "minLength": 1,
      "maxLength": 256
    },
    "UtcDateTimeEncoded": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d{3}Z$"
    }
  }
}
```

### Underlying API operations

- `inboxConnections.adoptWarmupS0Label`: `POST /v1/workspaces/:workspaceId/inboxes/:inboxId/google-warmup-label/adopt`