# 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)

## get_thread_reminder

Return the current reminder for one thread, or null.

Use before scheduling to check whether a thread already has a pending reminder.

Do not use for workspace-wide listing; use list_reminders.

Scopes: unibox:read

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

### 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})$",
      "format": "uuid"
    },
    "threadId": {
      "$ref": "#/$defs/ProviderId"
    }
  },
  "required": [
    "workspaceId",
    "threadId"
  ],
  "patternProperties": {
    "^(?!(?:workspaceId|threadId)$)[\\s\\S]*$": false
  },
  "additionalProperties": true,
  "propertyNames": {
    "type": "string",
    "enum": [
      "workspaceId",
      "threadId"
    ]
  },
  "$defs": {
    "ProviderId": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512
    }
  }
}
```

### 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})$",
      "format": "uuid"
    },
    "threadId": {
      "$ref": "#/$defs/ProviderId"
    }
  },
  "required": [
    "workspaceId",
    "threadId"
  ],
  "patternProperties": {
    "^(?!(?:workspaceId|threadId)$)[\\s\\S]*$": false
  },
  "additionalProperties": true,
  "propertyNames": {
    "type": "string",
    "enum": [
      "workspaceId",
      "threadId"
    ]
  },
  "$defs": {
    "ProviderId": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512
    }
  }
}
```

### Output schema (structuredContent)

```json
{
  "$defs": {
    "ProviderId": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512
    },
    "UtcDateTimeEncoded": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d{3}Z$"
    }
  },
  "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": {
                  "$ref": "#/$defs/ProviderId"
                },
                "remindAt": {
                  "$ref": "#/$defs/UtcDateTimeEncoded"
                },
                "isAutomatic": {
                  "type": "boolean"
                },
                "status": {
                  "type": "string",
                  "enum": [
                    "pending",
                    "sent",
                    "cancelled"
                  ]
                },
                "sentAt": {
                  "anyOf": [
                    {
                      "$ref": "#/$defs/UtcDateTimeEncoded"
                    },
                    {
                      "type": "null"
                    }
                  ]
                },
                "cancelledAt": {
                  "anyOf": [
                    {
                      "$ref": "#/$defs/UtcDateTimeEncoded"
                    },
                    {
                      "type": "null"
                    }
                  ]
                },
                "jobRunId": {
                  "anyOf": [
                    {
                      "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})$",
                          "format": "uuid"
                        },
                        {
                          "type": "string",
                          "pattern": "^run_[a-zA-Z0-9]{1,200}$"
                        }
                      ]
                    },
                    {
                      "type": "null"
                    }
                  ]
                },
                "createdAt": {
                  "$ref": "#/$defs/UtcDateTimeEncoded"
                },
                "updatedAt": {
                  "$ref": "#/$defs/UtcDateTimeEncoded"
                }
              },
              "required": [
                "id",
                "workspaceId",
                "threadId",
                "remindAt",
                "isAutomatic",
                "status",
                "sentAt",
                "cancelledAt",
                "jobRunId",
                "createdAt",
                "updatedAt"
              ],
              "patternProperties": {
                "^(?!(?:id|workspaceId|threadId|remindAt|isAutomatic|status|sentAt|cancelledAt|jobRunId|createdAt|updatedAt)$)[\\s\\S]*$": false
              },
              "additionalProperties": true,
              "propertyNames": {
                "type": "string",
                "enum": [
                  "id",
                  "workspaceId",
                  "threadId",
                  "remindAt",
                  "isAutomatic",
                  "status",
                  "sentAt",
                  "cancelledAt",
                  "jobRunId",
                  "createdAt",
                  "updatedAt"
                ]
              }
            },
            {
              "type": "null"
            }
          ]
        },
        {
          "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": {
                      "$ref": "#/$defs/ProviderId"
                    },
                    "remindAt": {
                      "$ref": "#/$defs/UtcDateTimeEncoded"
                    },
                    "isAutomatic": {
                      "type": "boolean"
                    },
                    "status": {
                      "type": "string",
                      "enum": [
                        "pending",
                        "sent",
                        "cancelled"
                      ]
                    },
                    "sentAt": {
                      "anyOf": [
                        {
                          "$ref": "#/$defs/UtcDateTimeEncoded"
                        },
                        {
                          "type": "null"
                        }
                      ]
                    },
                    "cancelledAt": {
                      "anyOf": [
                        {
                          "$ref": "#/$defs/UtcDateTimeEncoded"
                        },
                        {
                          "type": "null"
                        }
                      ]
                    },
                    "jobRunId": {
                      "anyOf": [
                        {
                          "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})$",
                              "format": "uuid"
                            },
                            {
                              "type": "string",
                              "pattern": "^run_[a-zA-Z0-9]{1,200}$"
                            }
                          ]
                        },
                        {
                          "type": "null"
                        }
                      ]
                    },
                    "createdAt": {
                      "$ref": "#/$defs/UtcDateTimeEncoded"
                    },
                    "updatedAt": {
                      "$ref": "#/$defs/UtcDateTimeEncoded"
                    }
                  },
                  "required": [
                    "id",
                    "workspaceId",
                    "threadId",
                    "remindAt",
                    "isAutomatic",
                    "status",
                    "sentAt",
                    "cancelledAt",
                    "jobRunId",
                    "createdAt",
                    "updatedAt"
                  ],
                  "patternProperties": {
                    "^(?!(?:id|workspaceId|threadId|remindAt|isAutomatic|status|sentAt|cancelledAt|jobRunId|createdAt|updatedAt)$)[\\s\\S]*$": false
                  },
                  "additionalProperties": true,
                  "propertyNames": {
                    "type": "string",
                    "enum": [
                      "id",
                      "workspaceId",
                      "threadId",
                      "remindAt",
                      "isAutomatic",
                      "status",
                      "sentAt",
                      "cancelledAt",
                      "jobRunId",
                      "createdAt",
                      "updatedAt"
                    ]
                  }
                },
                {
                  "type": "null"
                }
              ]
            },
            {
              "not": {
                "type": "object"
              }
            }
          ]
        }
      },
      "required": [
        "data"
      ],
      "additionalProperties": false
    }
  ]
}
```

### Underlying API operations

- `reminders.getForThread`: `GET /v1/workspaces/:workspaceId/reminders/thread/:threadId`