# 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)

## read_unibox_reply_drafts

Read an exact durable reply draft or list the conversation's drafts for human review. Returns authored bytes, not rendered or send-approved content.

Read after saving, before updating, and when handing the exact draft to a human. List uses a draft-ID cursor, twenty per page.

This does not preview, approve, or send a reply.

Scopes: unibox:read

Risk: read; confirmation: none; idempotency: none.

### Input schema (personal API key)

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

### Input schema (OAuth / delegated agent)

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

### Output schema (structuredContent)

```json
{
  "$defs": {
    "UtcDateTimeEncoded": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d{3}Z$"
    },
    "EmailAddress": {
      "type": "string",
      "minLength": 3,
      "maxLength": 320,
      "pattern": "^[^\\s@]+@[^\\s@]+\\.[^\\s@]+$"
    },
    "ReplyBody": {
      "type": "string",
      "minLength": 1,
      "maxLength": 1000000
    }
  },
  "type": "object",
  "anyOf": [
    {
      "allOf": [
        {
          "anyOf": [
            {
              "type": "object",
              "properties": {
                "id": {
                  "type": "string",
                  "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
                  "format": "uuid"
                },
                "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})$",
                  "format": "uuid"
                },
                "threadId": {
                  "type": "string",
                  "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
                  "format": "uuid"
                },
                "messageId": {
                  "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})$",
                  "format": "uuid"
                },
                "fromInboxId": {
                  "type": "string",
                  "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
                  "format": "uuid"
                },
                "subject": {
                  "anyOf": [
                    {
                      "type": "string",
                      "maxLength": 998,
                      "pattern": "^[^\\r\\n\\u0000]*$"
                    },
                    {
                      "type": "null"
                    }
                  ]
                },
                "revision": {
                  "type": "integer",
                  "minimum": 0,
                  "maximum": 9007199254740991,
                  "allOf": [
                    {
                      "maximum": 2147483647
                    }
                  ]
                },
                "createdAt": {
                  "$ref": "#/$defs/UtcDateTimeEncoded"
                },
                "updatedAt": {
                  "$ref": "#/$defs/UtcDateTimeEncoded"
                },
                "state": {
                  "type": "string",
                  "enum": [
                    "draft"
                  ]
                },
                "draft": {
                  "type": "object",
                  "properties": {
                    "fromInboxId": {
                      "type": "string",
                      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
                      "format": "uuid"
                    },
                    "to": {
                      "type": "array",
                      "items": {
                        "$ref": "#/$defs/EmailAddress"
                      },
                      "minItems": 1,
                      "maxItems": 50
                    },
                    "cc": {
                      "type": "array",
                      "items": {
                        "$ref": "#/$defs/EmailAddress"
                      },
                      "minItems": 0,
                      "maxItems": 50
                    },
                    "bcc": {
                      "type": "array",
                      "items": {
                        "$ref": "#/$defs/EmailAddress"
                      },
                      "minItems": 0,
                      "maxItems": 50
                    },
                    "body": {
                      "$ref": "#/$defs/ReplyBody"
                    },
                    "bodyContentType": {
                      "type": "string",
                      "enum": [
                        "html",
                        "plain"
                      ]
                    },
                    "personalizationTemplate": {
                      "type": "string",
                      "minLength": 1,
                      "maxLength": 100000
                    },
                    "track": {
                      "type": "boolean"
                    }
                  },
                  "required": [
                    "to",
                    "body",
                    "bodyContentType"
                  ],
                  "patternProperties": {
                    "^(?!(?:fromInboxId|to|cc|bcc|body|bodyContentType|personalizationTemplate|track)$)[\\s\\S]*$": false
                  },
                  "additionalProperties": true,
                  "propertyNames": {
                    "type": "string",
                    "enum": [
                      "fromInboxId",
                      "to",
                      "cc",
                      "bcc",
                      "body",
                      "bodyContentType",
                      "personalizationTemplate",
                      "track"
                    ]
                  }
                }
              },
              "required": [
                "id",
                "workspaceId",
                "threadId",
                "messageId",
                "fromInboxId",
                "subject",
                "revision",
                "createdAt",
                "updatedAt",
                "state",
                "draft"
              ],
              "patternProperties": {
                "^(?!(?:id|workspaceId|threadId|messageId|fromInboxId|subject|revision|createdAt|updatedAt|state|draft)$)[\\s\\S]*$": false
              },
              "additionalProperties": true,
              "propertyNames": {
                "type": "string",
                "enum": [
                  "id",
                  "workspaceId",
                  "threadId",
                  "messageId",
                  "fromInboxId",
                  "subject",
                  "revision",
                  "createdAt",
                  "updatedAt",
                  "state",
                  "draft"
                ]
              }
            },
            {
              "type": "object",
              "properties": {
                "items": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "properties": {
                      "id": {
                        "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})$",
                        "format": "uuid"
                      },
                      "workspaceId": {
                        "type": "string",
                        "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
                        "format": "uuid"
                      },
                      "threadId": {
                        "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})$",
                        "format": "uuid"
                      },
                      "messageId": {
                        "type": "string",
                        "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
                        "format": "uuid"
                      },
                      "fromInboxId": {
                        "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})$",
                        "format": "uuid"
                      },
                      "subject": {
                        "anyOf": [
                          {
                            "type": "string",
                            "maxLength": 998,
                            "pattern": "^[^\\r\\n\\u0000]*$"
                          },
                          {
                            "type": "null"
                          }
                        ]
                      },
                      "revision": {
                        "type": "integer",
                        "minimum": 0,
                        "maximum": 9007199254740991,
                        "allOf": [
                          {
                            "maximum": 2147483647
                          }
                        ]
                      },
                      "createdAt": {
                        "$ref": "#/$defs/UtcDateTimeEncoded"
                      },
                      "updatedAt": {
                        "$ref": "#/$defs/UtcDateTimeEncoded"
                      },
                      "state": {
                        "type": "string",
                        "enum": [
                          "draft"
                        ]
                      }
                    },
                    "required": [
                      "id",
                      "workspaceId",
                      "threadId",
                      "messageId",
                      "fromInboxId",
                      "subject",
                      "revision",
                      "createdAt",
                      "updatedAt",
                      "state"
                    ],
                    "patternProperties": {
                      "^(?!(?:id|workspaceId|threadId|messageId|fromInboxId|subject|revision|createdAt|updatedAt|state)$)[\\s\\S]*$": false
                    },
                    "additionalProperties": true,
                    "propertyNames": {
                      "type": "string",
                      "enum": [
                        "id",
                        "workspaceId",
                        "threadId",
                        "messageId",
                        "fromInboxId",
                        "subject",
                        "revision",
                        "createdAt",
                        "updatedAt",
                        "state"
                      ]
                    }
                  },
                  "maxItems": 20
                },
                "nextCursor": {
                  "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})$",
                      "format": "uuid"
                    },
                    {
                      "type": "null"
                    }
                  ]
                }
              },
              "required": [
                "items",
                "nextCursor"
              ],
              "patternProperties": {
                "^(?!(?:items|nextCursor)$)[\\s\\S]*$": false
              },
              "additionalProperties": true,
              "propertyNames": {
                "type": "string",
                "enum": [
                  "items",
                  "nextCursor"
                ]
              }
            }
          ]
        },
        {
          "type": "object"
        }
      ]
    },
    {
      "type": "object",
      "properties": {
        "data": {
          "allOf": [
            {
              "anyOf": [
                {
                  "type": "object",
                  "properties": {
                    "id": {
                      "type": "string",
                      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
                      "format": "uuid"
                    },
                    "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})$",
                      "format": "uuid"
                    },
                    "threadId": {
                      "type": "string",
                      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
                      "format": "uuid"
                    },
                    "messageId": {
                      "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})$",
                      "format": "uuid"
                    },
                    "fromInboxId": {
                      "type": "string",
                      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
                      "format": "uuid"
                    },
                    "subject": {
                      "anyOf": [
                        {
                          "type": "string",
                          "maxLength": 998,
                          "pattern": "^[^\\r\\n\\u0000]*$"
                        },
                        {
                          "type": "null"
                        }
                      ]
                    },
                    "revision": {
                      "type": "integer",
                      "minimum": 0,
                      "maximum": 9007199254740991,
                      "allOf": [
                        {
                          "maximum": 2147483647
                        }
                      ]
                    },
                    "createdAt": {
                      "$ref": "#/$defs/UtcDateTimeEncoded"
                    },
                    "updatedAt": {
                      "$ref": "#/$defs/UtcDateTimeEncoded"
                    },
                    "state": {
                      "type": "string",
                      "enum": [
                        "draft"
                      ]
                    },
                    "draft": {
                      "type": "object",
                      "properties": {
                        "fromInboxId": {
                          "type": "string",
                          "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
                          "format": "uuid"
                        },
                        "to": {
                          "type": "array",
                          "items": {
                            "$ref": "#/$defs/EmailAddress"
                          },
                          "minItems": 1,
                          "maxItems": 50
                        },
                        "cc": {
                          "type": "array",
                          "items": {
                            "$ref": "#/$defs/EmailAddress"
                          },
                          "minItems": 0,
                          "maxItems": 50
                        },
                        "bcc": {
                          "type": "array",
                          "items": {
                            "$ref": "#/$defs/EmailAddress"
                          },
                          "minItems": 0,
                          "maxItems": 50
                        },
                        "body": {
                          "$ref": "#/$defs/ReplyBody"
                        },
                        "bodyContentType": {
                          "type": "string",
                          "enum": [
                            "html",
                            "plain"
                          ]
                        },
                        "personalizationTemplate": {
                          "type": "string",
                          "minLength": 1,
                          "maxLength": 100000
                        },
                        "track": {
                          "type": "boolean"
                        }
                      },
                      "required": [
                        "to",
                        "body",
                        "bodyContentType"
                      ],
                      "patternProperties": {
                        "^(?!(?:fromInboxId|to|cc|bcc|body|bodyContentType|personalizationTemplate|track)$)[\\s\\S]*$": false
                      },
                      "additionalProperties": true,
                      "propertyNames": {
                        "type": "string",
                        "enum": [
                          "fromInboxId",
                          "to",
                          "cc",
                          "bcc",
                          "body",
                          "bodyContentType",
                          "personalizationTemplate",
                          "track"
                        ]
                      }
                    }
                  },
                  "required": [
                    "id",
                    "workspaceId",
                    "threadId",
                    "messageId",
                    "fromInboxId",
                    "subject",
                    "revision",
                    "createdAt",
                    "updatedAt",
                    "state",
                    "draft"
                  ],
                  "patternProperties": {
                    "^(?!(?:id|workspaceId|threadId|messageId|fromInboxId|subject|revision|createdAt|updatedAt|state|draft)$)[\\s\\S]*$": false
                  },
                  "additionalProperties": true,
                  "propertyNames": {
                    "type": "string",
                    "enum": [
                      "id",
                      "workspaceId",
                      "threadId",
                      "messageId",
                      "fromInboxId",
                      "subject",
                      "revision",
                      "createdAt",
                      "updatedAt",
                      "state",
                      "draft"
                    ]
                  }
                },
                {
                  "type": "object",
                  "properties": {
                    "items": {
                      "type": "array",
                      "items": {
                        "type": "object",
                        "properties": {
                          "id": {
                            "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})$",
                            "format": "uuid"
                          },
                          "workspaceId": {
                            "type": "string",
                            "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
                            "format": "uuid"
                          },
                          "threadId": {
                            "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})$",
                            "format": "uuid"
                          },
                          "messageId": {
                            "type": "string",
                            "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
                            "format": "uuid"
                          },
                          "fromInboxId": {
                            "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})$",
                            "format": "uuid"
                          },
                          "subject": {
                            "anyOf": [
                              {
                                "type": "string",
                                "maxLength": 998,
                                "pattern": "^[^\\r\\n\\u0000]*$"
                              },
                              {
                                "type": "null"
                              }
                            ]
                          },
                          "revision": {
                            "type": "integer",
                            "minimum": 0,
                            "maximum": 9007199254740991,
                            "allOf": [
                              {
                                "maximum": 2147483647
                              }
                            ]
                          },
                          "createdAt": {
                            "$ref": "#/$defs/UtcDateTimeEncoded"
                          },
                          "updatedAt": {
                            "$ref": "#/$defs/UtcDateTimeEncoded"
                          },
                          "state": {
                            "type": "string",
                            "enum": [
                              "draft"
                            ]
                          }
                        },
                        "required": [
                          "id",
                          "workspaceId",
                          "threadId",
                          "messageId",
                          "fromInboxId",
                          "subject",
                          "revision",
                          "createdAt",
                          "updatedAt",
                          "state"
                        ],
                        "patternProperties": {
                          "^(?!(?:id|workspaceId|threadId|messageId|fromInboxId|subject|revision|createdAt|updatedAt|state)$)[\\s\\S]*$": false
                        },
                        "additionalProperties": true,
                        "propertyNames": {
                          "type": "string",
                          "enum": [
                            "id",
                            "workspaceId",
                            "threadId",
                            "messageId",
                            "fromInboxId",
                            "subject",
                            "revision",
                            "createdAt",
                            "updatedAt",
                            "state"
                          ]
                        }
                      },
                      "maxItems": 20
                    },
                    "nextCursor": {
                      "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})$",
                          "format": "uuid"
                        },
                        {
                          "type": "null"
                        }
                      ]
                    }
                  },
                  "required": [
                    "items",
                    "nextCursor"
                  ],
                  "patternProperties": {
                    "^(?!(?:items|nextCursor)$)[\\s\\S]*$": false
                  },
                  "additionalProperties": true,
                  "propertyNames": {
                    "type": "string",
                    "enum": [
                      "items",
                      "nextCursor"
                    ]
                  }
                }
              ]
            },
            {
              "not": {
                "type": "object"
              }
            }
          ]
        }
      },
      "required": [
        "data"
      ],
      "additionalProperties": false
    }
  ]
}
```

### Underlying API operations

- `uniboxThreads.getReplyDraft`: `GET /v1/workspaces/:workspaceId/unibox/threads/:threadId/reply-drafts/:draftId`
- `uniboxThreads.listReplyDrafts`: `GET /v1/workspaces/:workspaceId/unibox/threads/:threadId/reply-drafts`