update_transaction_custom_task

Update transaction checklist task

Rename, complete, or reopen one buyer-created checklist item. A task from a stage the transaction has already passed stays editable (a walkthrough item written under contract is completed after the close); only a task filed ahead of the current stage waits. To complete a task, pass taskId and completed without a title; a title is at most 180 characters. Reuse mutationId for an exact retry. Completion records checklist state only and does not prove an external, legal, financial, document, or communication action occurred.

Effect: Draft or workspace edit
Required scopes: workspace:write
Workflow stages: closing, transaction
Data classes: deadlines tasks, transaction
Operation cost: 2 weighted units; additional domain limits may apply.
Configurations: Standard, Buyer UI v2
Muse proposal: Write. Creates or updates draft, document, or workspace data within the authorized workflow. Meta makes the final classification during review.

Buyer approval and signing controls apply in addition to the scopes above. Read error and retry guidance before implementing recovery.

Input and output contracts

Returns structured content and a JSON text content block. Live discovery may compact a large output schema; execution validates the full contract below.

Input fields

Required applies within the containing object. Optional fields can be omitted; null is accepted only where listed. Field descriptions and constraints come from the source schema. The raw schema remains the complete contract.

Field	Required	Meaning and constraints
`expectedCustomTasksRevision`string	No	Pattern validation applies; see the raw schema.
`mutationId`string	Yes	A fresh random UUID (v4) you generate for this mutation. Send the same UUID only to retry the identical mutation; never a readable label. Format: uuid. Pattern validation applies; see the raw schema.
`workspaceId`string	Yes	Pattern validation applies; see the raw schema.
`completed`boolean	No	No additional description in the contract.
`taskId`string	Yes	Pattern validation applies; see the raw schema.
`title`string	No	Minimum characters: 1. Maximum characters: 180.

Output fields

Field Required Meaning and constraints

customTaskobject

Yes

Extra fields are not allowed.

customTask: nested contract

Field	Required	Meaning and constraints
`completed`boolean	Yes	No additional description in the contract.
`id`string	Yes	Pattern validation applies; see the raw schema.
`phaseId`string	Yes	Allowed: "signed", "sent", "negotiating", "under-contract", "post-purchase".
`title`string	Yes	Minimum characters: 1. Maximum characters: 180.
`updatedAt`string \| null	Yes	Must match at least one alternative.
updatedAt: nested contract Alternative 1: string Format: date-time. Pattern validation applies; see the raw schema. Alternative 2: null

customTasksarray<object>

Yes

Maximum items: 50.

customTasks: nested contract

Array item contract

Extra fields are not allowed.

Field	Required	Meaning and constraints
`completed`boolean	Yes	No additional description in the contract.
`id`string	Yes	Pattern validation applies; see the raw schema.
`phaseId`string	Yes	Allowed: "signed", "sent", "negotiating", "under-contract", "post-purchase".
`title`string	Yes	Minimum characters: 1. Maximum characters: 180.
`updatedAt`string \| null	Yes	Must match at least one alternative.
updatedAt: nested contract Alternative 1: string Format: date-time. Pattern validation applies; see the raw schema. Alternative 2: null

customTasksRevisionstring

Yes

Pattern validation applies; see the raw schema.

mutationIdstring

Yes

A fresh random UUID (v4) you generate for this mutation. Send the same UUID only to retry the identical mutation; never a readable label.

Format: uuid.

Pattern validation applies; see the raw schema.

schemaVersionstring

Yes

Must be "1".

workspaceIdstring

Yes

Pattern validation applies; see the raw schema.

Raw input schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "expectedCustomTasksRevision": {
      "type": "string",
      "pattern": "^[0-9a-f]{64}$"
    },
    "mutationId": {
      "type": "string",
      "format": "uuid",
      "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|ffffffff-ffff-ffff-ffff-ffffffffffff)$",
      "description": "A fresh random UUID (v4) you generate for this mutation. Send the same UUID only to retry the identical mutation; never a readable label."
    },
    "workspaceId": {
      "type": "string",
      "pattern": "^[A-Za-z0-9_-]{1,200}$"
    },
    "completed": {
      "type": "boolean"
    },
    "taskId": {
      "type": "string",
      "pattern": "^[A-Za-z0-9_-]{1,200}$"
    },
    "title": {
      "type": "string",
      "minLength": 1,
      "maxLength": 180
    }
  },
  "required": [
    "mutationId",
    "workspaceId",
    "taskId"
  ],
  "additionalProperties": false
}

Full output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "customTask": {
      "type": "object",
      "properties": {
        "completed": {
          "type": "boolean"
        },
        "id": {
          "type": "string",
          "pattern": "^[A-Za-z0-9_-]{1,200}$"
        },
        "phaseId": {
          "type": "string",
          "enum": [
            "signed",
            "sent",
            "negotiating",
            "under-contract",
            "post-purchase"
          ]
        },
        "title": {
          "type": "string",
          "minLength": 1,
          "maxLength": 180
        },
        "updatedAt": {
          "anyOf": [
            {
              "type": "string",
              "format": "date-time",
              "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"
            },
            {
              "type": "null"
            }
          ]
        }
      },
      "required": [
        "completed",
        "id",
        "phaseId",
        "title",
        "updatedAt"
      ],
      "additionalProperties": false
    },
    "customTasks": {
      "maxItems": 50,
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "completed": {
            "type": "boolean"
          },
          "id": {
            "type": "string",
            "pattern": "^[A-Za-z0-9_-]{1,200}$"
          },
          "phaseId": {
            "type": "string",
            "enum": [
              "signed",
              "sent",
              "negotiating",
              "under-contract",
              "post-purchase"
            ]
          },
          "title": {
            "type": "string",
            "minLength": 1,
            "maxLength": 180
          },
          "updatedAt": {
            "anyOf": [
              {
                "type": "string",
                "format": "date-time",
                "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"
              },
              {
                "type": "null"
              }
            ]
          }
        },
        "required": [
          "completed",
          "id",
          "phaseId",
          "title",
          "updatedAt"
        ],
        "additionalProperties": false
      }
    },
    "customTasksRevision": {
      "type": "string",
      "pattern": "^[0-9a-f]{64}$"
    },
    "mutationId": {
      "type": "string",
      "format": "uuid",
      "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|ffffffff-ffff-ffff-ffff-ffffffffffff)$",
      "description": "A fresh random UUID (v4) you generate for this mutation. Send the same UUID only to retry the identical mutation; never a readable label."
    },
    "schemaVersion": {
      "type": "string",
      "const": "1"
    },
    "workspaceId": {
      "type": "string",
      "pattern": "^[A-Za-z0-9_-]{1,200}$"
    }
  },
  "required": [
    "customTask",
    "customTasks",
    "customTasksRevision",
    "mutationId",
    "schemaVersion",
    "workspaceId"
  ],
  "additionalProperties": false
}

Tool annotations

{
  "destructiveHint": false,
  "idempotentHint": true,
  "openWorldHint": false,
  "readOnlyHint": false
}

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