SynkraAI · rafaelscosta · May 7, 2026 · May 7, 2026
@@ -15,15 +15,15 @@ class ResultAggregator extends EventEmitter {
     super();
 
     // Root path for reports
-    this.rootPath = config.rootPath || process.cwd();
-    this.reportDir = config.reportDir || path.join(this.rootPath, 'plan');
+    this.rootPath = config.rootPath ?? process.cwd();
+    this.reportDir = config.reportDir ?? path.join(this.rootPath, 'plan');
 
     // Conflict detection settings
     this.detectConflicts = config.detectConflicts !== false;
 
     // Aggregation history
     this.history = [];
-    this.maxHistory = config.maxHistory || 50;
+    this.maxHistory = config.maxHistory ?? 50;
   }
 
   /**
@@ -36,8 +36,8 @@ class ResultAggregator extends EventEmitter {
 
     const aggregation = {
       id: `agg-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`,
-      waveIndex: waveResults.waveIndex || waveResults.wave,
-      startedAt: waveResults.startedAt || new Date().toISOString(),
+      waveIndex: waveResults.waveIndex ?? waveResults.wave,
+      startedAt: waveResults.startedAt ?? new Date().toISOString(),
       completedAt: new Date().toISOString(),
       tasks: [],
       conflicts: [],
@@ -50,11 +50,13 @@ class ResultAggregator extends EventEmitter {
     for (const result of results) {
       aggregation.tasks.push({
         taskId: result.taskId,
-        agentId: result.agentId || 'unknown',
+        agentId: result.agentId ?? 'unknown',
         success: result.success,
-        filesModified: result.filesModified || this.extractFilesFromOutput(result.output),
-        duration: result.duration || 0,
-        output: this.summarizeOutput(result.output || result.result?.output),
+        filesModified: Array.isArray(result.filesModified)
+          ? result.filesModified
+          : this.extractFilesFromOutput(result.output ?? result.result?.output),
+        duration: result.duration ?? 0,
+        output: this.summarizeOutput(result.output ?? result.result?.output),
         error: result.error,
       });
     }
@@ -366,7 +368,7 @@ class ResultAggregator extends EventEmitter {
    * @returns {Promise<string>} - Report file path
    */
   async generateReport(aggregation, filename = null) {
-    const reportName = filename || `wave-results-${aggregation.waveIndex || 'all'}.json`;
+    const reportName = filename || `wave-results-${aggregation.waveIndex ?? 'all'}.json`;
     const reportPath = path.join(this.reportDir, reportName);
 
     // Ensure directory exists
@@ -394,7 +396,7 @@ class ResultAggregator extends EventEmitter {
 
     let md = '# Wave Results Report\n\n';
     md += `> **Generated:** ${aggregation.completedAt}\n`;
-    md += `> **Success Rate:** ${metrics.successRate || metrics.overallSuccessRate}%\n\n`;
+    md += `> **Success Rate:** ${metrics.successRate ?? metrics.overallSuccessRate}%\n\n`;
 
     md += '## Summary\n\n';
     md += '| Metric | Value |\n';
@@ -403,8 +405,8 @@ class ResultAggregator extends EventEmitter {
     md += `| Successful | ${metrics.successful} |\n`;
     md += `| Failed | ${metrics.failed} |\n`;
     md += `| Duration | ${Math.round(metrics.totalDuration / 1000)}s |\n`;
-    md += `| Conflicts | ${metrics.conflictCount || metrics.totalConflicts || 0} |\n`;
-    md += `| Files Modified | ${metrics.filesModified || 'N/A'} |\n\n`;
+    md += `| Conflicts | ${metrics.conflictCount ?? metrics.totalConflicts ?? 0} |\n`;
+    md += `| Files Modified | ${metrics.filesModified ?? 'N/A'} |\n\n`;
 
     // Tasks section
     if (aggregation.tasks && aggregation.tasks.length > 0) {
@@ -414,7 +416,7 @@ class ResultAggregator extends EventEmitter {
 
       for (const task of aggregation.tasks) {
         const status = task.success ? '✅' : '❌';
-        const duration = task.duration ? `${Math.round(task.duration / 1000)}s` : '-';
+        const duration = task.duration != null ? `${Math.round(task.duration / 1000)}s` : '-';
         md += `| ${task.taskId} | ${task.agentId} | ${status} | ${duration} |\n`;
       }
       md += '\n';

@@ -1,6 +1,6 @@
 metadata:
   version: 1.0.0
-  lastUpdated: '2026-05-07T14:31:05.482Z'
+  lastUpdated: '2026-05-07T15:02:59.792Z'
   entityCount: 746
   checksumAlgorithm: sha256
   resolutionRate: 100
@@ -8822,8 +8822,8 @@ entities:
         score: 0.4
         constraints: []
         extensionPoints: []
-      checksum: sha256:fc662bbc649bf704a8f6e70d0203fab389c664a6b4b2932510f84c251ae26610
-      lastVerified: '2026-03-11T00:48:55.878Z'
+      checksum: sha256:bcd102ca46e74d61af151aa7877921807c9bf5aba45bfba73f9f5c8cf714d8e2
+      lastVerified: '2026-05-07T15:02:59.785Z'
     semantic-merge-engine:
       path: .aiox-core/core/execution/semantic-merge-engine.js
       layer: L1

@@ -7,8 +7,8 @@
 # - SHA256 hashes for change detection
 # - File types for categorization
 #
-version: 5.1.8
-generated_at: "2026-05-07T14:31:25.534Z"
+version: 5.1.9
+generated_at: "2026-05-07T15:10:49.402Z"
 generator: scripts/generate-install-manifest.js
 file_count: 1103
 files:
@@ -429,9 +429,9 @@ files:
     type: core
     size: 9033
   - path: core/execution/result-aggregator.js
-    hash: sha256:fc662bbc649bf704a8f6e70d0203fab389c664a6b4b2932510f84c251ae26610
+    hash: sha256:bcd102ca46e74d61af151aa7877921807c9bf5aba45bfba73f9f5c8cf714d8e2
     type: core
-    size: 14553
+    size: 14643
   - path: core/execution/semantic-merge-engine.js
     hash: sha256:26f2a057407cf114a0611944960a8e6d58d93c5e03abe905489e6b699cb98a75
     type: core
@@ -1229,7 +1229,7 @@ files:
     type: data
     size: 9590
   - path: data/entity-registry.yaml
-    hash: sha256:277cd2b2973a8b33b7b512794106c6e5e8a5536ed8aecc3c269f7c8ae84c9cf0
+    hash: sha256:16fcaa219a4c1364337ae2d534494fe4f058570ba6f3db797e373d5cd0d7e672
     type: data
     size: 522368
   - path: data/learned-patterns.yaml

@@ -0,0 +1,51 @@
+# STORY-123.13: Preservar valores falsy válidos no ResultAggregator
+
+## Status
+
+Done
+
+## Story
+
+Como operador do executor paralelo, quero que o ResultAggregator preserve valores válidos como `waveIndex: 0`, `duration: 0`, `filesModified: 0` e strings vazias intencionais, para que relatórios, histórico e markdown não tratem dados reais como ausentes.
+
+## Acceptance Criteria
+
+- [x] AC1. `waveIndex: 0` é preservado durante `aggregate()` e no nome padrão do relatório.
+- [x] AC2. Defaults usam fallback apenas para `null`/`undefined` quando valores falsy são válidos.
+- [x] AC3. `filesModified` continua seguro: valores não-array não quebram a agregação e caem para extração por output.
+- [x] AC4. Markdown renderiza métricas zero em vez de trocar para valores alternativos ou `N/A`.
+- [x] AC5. Há regressões automatizadas cobrindo o comportamento.
+
+## Tasks
+
+- [x] Atualizar defaults falsy-safe em `.aiox-core/core/execution/result-aggregator.js`.
+- [x] Adicionar regressões focadas em `tests/core/result-aggregator.test.js`.
+- [x] Bump de patch para `@aiox-squads/core@5.1.9`.
+- [x] Regenerar manifest antes do PR.
+
+## Dev Notes
+
+- Esta story substitui o escopo útil do PR histórico #611 sem reaproveitar o branch antigo, que estava com CI/manifest obsoleto e review pendente.
+- O ajuste evita uma troca mecânica cega de `||` por `??`: campos que precisam ser array continuam normalizados antes do uso.
+
+## Validation
+
+- `node -c .aiox-core/core/execution/result-aggregator.js` -> PASS.
+- `npm test -- tests/core/result-aggregator.test.js --runInBand` -> PASS, 1 suite / 36 tests.
+- `npm test -- tests/core/result-aggregator.test.js tests/core/wave-executor.test.js tests/core/build-state-manager.test.js --runInBand --forceExit` -> PASS, 3 suites / 117 tests.
+- `npm run validate:manifest` -> PASS.
+- `npm run validate:publish` -> PASS.
+- `npm run lint -- --quiet` -> PASS.
+- `npm run typecheck` -> PASS.
+- `git diff --check` -> PASS.
+- `npm run test:ci` -> PASS, 315 suites / 7.846 tests, 149 skipped.
+
+## File List
+
+- `.aiox-core/core/execution/result-aggregator.js`
+- `tests/core/result-aggregator.test.js`
+- `docs/stories/epic-123/STORY-123.13-result-aggregator-falsy-defaults.md`
+- `package.json`
+- `package-lock.json`
+- `.aiox-core/install-manifest.yaml`
+- `.aiox-core/data/entity-registry.yaml`
@@ -1,6 +1,6 @@
 {
   "name": "@aiox-squads/core",
-  "version": "5.1.8",
+  "version": "5.1.9",
   "description": "Synkra AIOX: AI-Orchestrated System for Full Stack Development - Core Framework",
   "bin": {
     "aiox": "bin/aiox.js",

@@ -43,6 +43,13 @@ describe('ResultAggregator', () => {
       expect(ra.maxHistory).toBe(10);
     });
 
+    test('preserves falsy but intentional config values', () => {
+      const ra = new ResultAggregator({ rootPath: '', reportDir: '', maxHistory: 0 });
+      expect(ra.rootPath).toBe('');
+      expect(ra.reportDir).toBe('');
+      expect(ra.maxHistory).toBe(0);
+    });
+
     test('extends EventEmitter', () => {
       const ra = new ResultAggregator();
       expect(typeof ra.on).toBe('function');
@@ -145,13 +152,64 @@ describe('ResultAggregator', () => {
       expect(ra.history.length).toBe(1);
     });
 
+    test('preserves wave zero and other falsy task values', async () => {
+      const ra = new ResultAggregator({ rootPath: tmpDir });
+      const result = await ra.aggregate({
+        waveIndex: 0,
+        startedAt: '',
+        results: [
+          {
+            taskId: 't0',
+            agentId: '',
+            success: true,
+            duration: 0,
+            output: '',
+            result: { output: 'fallback should not be used' },
+            filesModified: [],
+          },
+        ],
+      });
+
+      expect(result.waveIndex).toBe(0);
+      expect(result.startedAt).toBe('');
+      expect(result.tasks[0]).toMatchObject({
+        agentId: '',
+        duration: 0,
+        output: '',
+        filesModified: [],
+      });
+    });
+
+    test('falls back safely when filesModified is not an array', async () => {
+      const ra = new ResultAggregator({ rootPath: tmpDir });
+      const result = await ra.aggregate({
+        waveIndex: 1,
+        results: [
+          {
+            taskId: 't1',
+            success: true,
+            filesModified: false,
+            output: 'Created `src/app.js`',
+          },
+        ],
+      });
+
+      expect(result.tasks[0].filesModified).toEqual(['src/app.js']);
+    });
+
     test('trims history to maxHistory', async () => {
       const ra = new ResultAggregator({ rootPath: tmpDir, maxHistory: 2 });
       await ra.aggregate({ waveIndex: 1, results: [] });
       await ra.aggregate({ waveIndex: 2, results: [] });
       await ra.aggregate({ waveIndex: 3, results: [] });
       expect(ra.history.length).toBe(2);
     });
+
+    test('allows maxHistory zero without retaining entries', async () => {
+      const ra = new ResultAggregator({ rootPath: tmpDir, maxHistory: 0 });
+      await ra.aggregate({ waveIndex: 1, results: [] });
+      expect(ra.history.length).toBe(0);
+    });
   });
 
   // ── aggregateAll ──────────────────────────────────────────────────────
@@ -303,6 +361,30 @@ describe('ResultAggregator', () => {
       expect(fs.existsSync(reportPath)).toBe(true);
       expect(fs.existsSync(reportPath.replace('.json', '.md'))).toBe(true);
     });
+
+    test('uses wave zero in default report filename', async () => {
+      const reportDir = path.join(tmpDir, 'plan');
+      const ra = new ResultAggregator({ reportDir });
+      const agg = {
+        waveIndex: 0,
+        completedAt: new Date().toISOString(),
+        tasks: [],
+        conflicts: [],
+        warnings: [],
+        metrics: {
+          totalTasks: 0,
+          successful: 0,
+          failed: 0,
+          successRate: 100,
+          totalDuration: 0,
+          conflictCount: 0,
+          filesModified: 0,
+        },
+      };
+
+      const reportPath = await ra.generateReport(agg);
+      expect(path.basename(reportPath)).toBe('wave-results-0.json');
+    });
   });
 
   // ── formatMarkdown ────────────────────────────────────────────────────
@@ -335,6 +417,33 @@ describe('ResultAggregator', () => {
       expect(md).toContain('Conflicts');
       expect(md).toContain('app.js');
     });
+
+    test('renders zero metrics instead of falling back to alternate labels', () => {
+      const ra = new ResultAggregator();
+      const agg = {
+        completedAt: new Date().toISOString(),
+        tasks: [{ taskId: 't0', agentId: '@dev', success: true, duration: 0 }],
+        conflicts: [],
+        warnings: [],
+        metrics: {
+          totalTasks: 1,
+          successful: 1,
+          failed: 0,
+          successRate: 0,
+          overallSuccessRate: 99,
+          totalDuration: 0,
+          conflictCount: 0,
+          totalConflicts: 12,
+          filesModified: 0,
+        },
+      };
+
+      const md = ra.formatMarkdown(agg);
+      expect(md).toContain('> **Success Rate:** 0%');
+      expect(md).toContain('| Conflicts | 0 |');
+      expect(md).toContain('| Files Modified | 0 |');
+      expect(md).toContain('| t0 | @dev | ✅ | 0s |');
+    });
   });
 
   // ── History ───────────────────────────────────────────────────────────