🐛 Bugfix: Why did start_module_generation fail with 'finalSession.resu...

Date: 2026-03-10
Time: 21:12:25 UTC
Session: gspace1-200.5
Agent: backend
Confidence: 95%
Status: ✅ Documented

📋 Decision Context

Question:

Why did start_module_generation fail with 'finalSession.result.executeResult.modules.map is not a function'?

Task: S200: Fix modules.map crash

🎯 Decision Made

Chosen:

Store actual module array in session.result.executeResult.modules instead of array.length count. The tool handler at line 1386 of tool-registry.service.ts calls .map() expecting objects with moduleId, moduleName, description, entities.

Options Considered:

1. Fix the tool handler to handle number type
2. Store full module array in session result (chosen)
3. Add a separate method to re-fetch module data

💭 Reasoning

Root cause: module-gen-phase.executor.ts line 737 stored executeResult: { modules: executeOutput.modules.length } — a number. The tool handler at tool-registry.service.ts line 1386 called .map() on it expecting an array. This is a data contract violation — the producer (executor) simplified the data for storage efficiency, but the consumer (tool handler) needed the full structure. Fix: store the actual module array with essential fields (moduleId, moduleName, description, entities). Early warning: any time session.result fields are set with summarized data, verify all consumers only need summaries.

📁 Files Involved

• APIs/backend-vitto-api/src/app/module-generation/phases/module-gen-phase.executor.ts
• APIs/backend-vitto-api/src/app/tools/tool-registry.service.ts

🔗 Related

• Decision ID: dev_1773177145499_azzzsid
• Session: 200
• Workspace: gspace1

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