{ "name": "TaskManager Tool: complete_task", "nodes": [ { "parameters": {}, "id": "c4a0b004-0001-4000-8000-000000000001", "name": "Execute Workflow Trigger", "type": "n8n-nodes-base.executeWorkflowTrigger", "typeVersion": 1.1, "position": [ 200, 400 ] }, { "parameters": { "mode": "runOnceForAllItems", "jsCode": "// ============================================================\n// INPUT VALIDATION \u2014 Verify task_id is valid integer\n// ============================================================\n\nconst input = $input.first().json;\nconst taskId = parseInt(input.task_id);\n\nif (isNaN(taskId) || taskId <= 0) {\n return [{\n json: {\n success: false,\n error: 'INVARIANT_VIOLATION: task_id must be a positive integer, got: ' + input.task_id,\n timestamp: new Date().toISOString()\n }\n }];\n}\n\nreturn [{ json: { task_id: taskId, validated: true } }];" }, "id": "c4a0b004-0001-4000-8000-000000000002", "name": "Validate Input", "type": "n8n-nodes-base.code", "typeVersion": 2, "position": [ 420, 400 ] }, { "parameters": { "operation": "read", "tableId": "DATA_TABLE_ID_TASKS", "returnAll": true, "options": {} }, "id": "c4a0b004-0001-4000-8000-000000000003", "name": "Data Table: Read All Tasks", "type": "n8n-nodes-base.dataTable", "typeVersion": 1, "position": [ 640, 400 ] }, { "parameters": { "mode": "runOnceForAllItems", "jsCode": "// ============================================================\n// TASK LOOKUP + STATUS CHECK\n// Find target task, verify it exists and isn't already done.\n// ============================================================\n\nconst taskId = $('Validate Input').first().json.task_id;\nconst allTasks = $input.all().map(item => item.json);\n\n// Find target task\nconst targetTask = allTasks.find(t => parseInt(t.id) === taskId);\n\nif (!targetTask) {\n return [{\n json: {\n success: false,\n error: 'NOT_FOUND: Task #' + taskId + ' does not exist in the database.',\n available_tasks: allTasks\n .filter(t => t.status !== 'done')\n .map(t => ({ id: t.id, title: t.title, status: t.status }))\n .slice(0, 10),\n timestamp: new Date().toISOString()\n }\n }];\n}\n\nif (targetTask.status === 'done') {\n return [{\n json: {\n success: false,\n error: 'IDEMPOTENCY_CHECK: Task #' + taskId + ' (\"' + targetTask.title + '\") is already marked as done (completed at ' + targetTask.completed_at + '). No action taken.',\n task: targetTask,\n timestamp: new Date().toISOString()\n }\n }];\n}\n\n// Task is valid and not yet complete\nreturn [{\n json: {\n success: true,\n target_task: targetTask,\n all_tasks: allTasks,\n proceed: true\n }\n}];" }, "id": "c4a0b004-0001-4000-8000-000000000004", "name": "Lookup & Status Check", "type": "n8n-nodes-base.code", "typeVersion": 2, "position": [ 860, 400 ] }, { "parameters": { "conditions": { "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict" }, "conditions": [ { "id": "proceed-check", "leftValue": "={{ $json.proceed }}", "rightValue": true, "operator": { "type": "boolean", "operation": "equals", "singleValue": true } } ], "combinator": "and" }, "options": {} }, "id": "c4a0b004-0001-4000-8000-000000000005", "name": "Proceed Gate", "type": "n8n-nodes-base.if", "typeVersion": 2.2, "position": [ 1080, 400 ] }, { "parameters": { "mode": "raw", "jsonOutput": "={\n \"id\": {{ $json.target_task.id }},\n \"status\": \"done\",\n \"completed_at\": \"{{ new Date().toISOString() }}\"\n}", "options": {} }, "id": "c4a0b004-0001-4000-8000-000000000006", "name": "Prepare Update", "type": "n8n-nodes-base.set", "typeVersion": 3.4, "position": [ 1300, 300 ] }, { "parameters": { "operation": "update", "tableId": "DATA_TABLE_ID_TASKS", "columns": { "mappingMode": "autoMapInputData" }, "options": {} }, "id": "c4a0b004-0001-4000-8000-000000000007", "name": "Data Table: Mark Done", "type": "n8n-nodes-base.dataTable", "typeVersion": 1, "position": [ 1520, 300 ] }, { "parameters": { "mode": "runOnceForAllItems", "jsCode": "// ============================================================\n// DAG TRAVERSAL ENGINE\n// After completing a task, traverse the dependency graph\n// to find tasks that are now unblocked.\n// ============================================================\n\nconst lookupData = $('Lookup & Status Check').first().json;\nconst completedTask = lookupData.target_task;\nconst completedId = String(completedTask.id);\nconst allTasks = lookupData.all_tasks;\nconst now = new Date();\n\n// --- Find newly unblocked tasks ---\nconst unblockedTasks = [];\n\nfor (const task of allTasks) {\n if (task.status === 'done' || task.status === 'cancelled') continue;\n if (!task.depends_on || task.depends_on === '') continue;\n\n const depIds = task.depends_on.split(',').map(d => d.trim());\n \n // Only check tasks that depend on the completed task\n if (!depIds.includes(completedId)) continue;\n\n // Check if ALL dependencies are now satisfied\n const allDepsSatisfied = depIds.every(depId => {\n if (depId === completedId) return true; // just completed\n const depTask = allTasks.find(t => String(t.id) === depId);\n return depTask && depTask.status === 'done';\n });\n\n if (allDepsSatisfied) {\n unblockedTasks.push({\n id: task.id,\n title: task.title,\n priority: task.priority,\n category: task.category\n });\n }\n}\n\n// --- Compute completion metrics ---\nconst createdAt = new Date(completedTask.created_at);\nconst completedAt = now;\nconst elapsedMs = completedAt - createdAt;\nconst elapsedHours = Math.round(elapsedMs / (1000 * 60 * 60) * 10) / 10;\nconst elapsedDays = Math.round(elapsedMs / (1000 * 60 * 60 * 24) * 10) / 10;\n\nlet elapsedHuman;\nif (elapsedDays >= 1) {\n elapsedHuman = elapsedDays + ' days';\n} else {\n elapsedHuman = elapsedHours + ' hours';\n}\n\n// --- Count completed tasks for productivity metric ---\nconst doneTasks = allTasks.filter(t => t.status === 'done').length + 1; // +1 for this one\nconst totalTasks = allTasks.length;\n\n// --- Check recurrence ---\nlet recurrenceNote = null;\nif (completedTask.recurrence_rule && completedTask.recurrence_rule !== 'none') {\n recurrenceNote = 'This is a recurring task (' + completedTask.recurrence_rule + '). A new instance should be created.';\n}\n\n// --- Build response ---\nconst response = {\n success: true,\n operation: 'task_completed',\n completed_task: {\n id: completedTask.id,\n title: completedTask.title,\n category: completedTask.category,\n priority_was: completedTask.priority,\n eisenhower_was: completedTask.eisenhower_quadrant,\n created_at: completedTask.created_at,\n completed_at: completedAt.toISOString()\n },\n metrics: {\n elapsed_human: elapsedHuman,\n elapsed_hours: elapsedHours,\n tasks_done_total: doneTasks,\n tasks_remaining: totalTasks - doneTasks,\n completion_rate: Math.round((doneTasks / totalTasks) * 100) + '%'\n },\n dependency_graph: {\n unblocked_tasks: unblockedTasks,\n unblocked_count: unblockedTasks.length\n },\n recurrence: recurrenceNote,\n timestamp: completedAt.toISOString()\n};\n\nreturn [{ json: response }];" }, "id": "c4a0b004-0001-4000-8000-000000000008", "name": "DAG Traversal & Response", "type": "n8n-nodes-base.code", "typeVersion": 2, "position": [ 1740, 300 ] } ], "connections": { "Execute Workflow Trigger": { "main": [ [ { "node": "Validate Input", "type": "main", "index": 0 } ] ] }, "Validate Input": { "main": [ [ { "node": "Data Table: Read All Tasks", "type": "main", "index": 0 } ] ] }, "Data Table: Read All Tasks": { "main": [ [ { "node": "Lookup & Status Check", "type": "main", "index": 0 } ] ] }, "Lookup & Status Check": { "main": [ [ { "node": "Proceed Gate", "type": "main", "index": 0 } ] ] }, "Proceed Gate": { "main": [ [ { "node": "Prepare Update", "type": "main", "index": 0 } ], [] ] }, "Prepare Update": { "main": [ [ { "node": "Data Table: Mark Done", "type": "main", "index": 0 } ] ] }, "Data Table: Mark Done": { "main": [ [ { "node": "DAG Traversal & Response", "type": "main", "index": 0 } ] ] } }, "settings": { "executionOrder": "v1" }, "staticData": null, "tags": [ { "name": "Tool", "id": "4" }, { "name": "Task Manager", "id": "2" } ] }