# Electron v40 Upgrade & GPT-5.2 Reasoning Configuration

## Summary of Changes (Feb 11, 2026)

### ✅ Electron v40 Upgrade Complete

**Upgraded Components:**
- Electron: v28.3.3 → v40.3.0
- Node.js (in Electron): v18.20.5 → v24.13.0  
- Chromium: v142 → v144

**Fixes Applied:**
1. **Native Module Rebuild**: Recompiled `better-sqlite3` for Electron v40's Node.js v24 using `@electron/rebuild`
2. **ESM Import Syntax**: Fixed Electron module imports to use default import pattern compatible with ESM:
   ```typescript
   // ✅ Correct for Electron v40
   import electron from "electron";
   const { app, BrowserWindow, Menu } = electron;
   ```
3. **Module System**: Maintained ES2022 module output with `"type": "module"` in package.json

**Files Modified:**
- `package.json` - Updated Electron and related dependencies
- `src/electron/index.ts` - Fixed import syntax
- `src/electron/ipc/customKeys.ts` - Fixed import syntax
- Native modules rebuilt with `npx @electron/rebuild`

### ✅ GPT-5.2 Reasoning Configuration

**Problem**: UI was sending model names like `gpt-5.2-low`, `gpt-5.2-high` which don't exist in OpenAI's API. GPT-5.2 uses a single base model with reasoning effort configured via `providerOptions`.

**Solution Implemented:**

1. **Model Name Normalization** (`ChatSessionManager.ts`):
   ```typescript
   // UI sends: "gpt-5.2-low"
   // API expects: "gpt-5.2" with reasoning.effort = "low" in providerOptions
   let normalizedModel = config.model;
   if (config.model.startsWith('gpt-5.2-')) {
     normalizedModel = 'gpt-5.2';  // Extract base model
   }
   model = openai(normalizedModel);
   ```

2. **Reasoning Effort Configuration** (`AgentService.ts`):
   ```typescript
   // For OpenAI GPT-5.x models with reasoning effort
   if (config.provider === 'openai' && config.reasoning?.effort) {
     providerOptions.openai = {
       reasoningEffort: config.reasoning.effort, // 'low' | 'medium' | 'high' | 'xhigh'
     };
   }

   const result = await streamText({
     model,
     messages,
     providerOptions, // Pass reasoning effort here
   });
   ```

3. **Message History Bug Fix** (`AgentService.ts`):
   - Fixed invalid message conversion that was producing `{"content":"undefined"}` errors
   - Properly handle content as both string and object formats
   - Filter out invalid messages with missing role or content
   - Add system prompt if not already in history

   ```typescript
   const messages = history
     .map((msg: any) => {
       const role = (msg.role || msg.message_role) as 'user' | 'assistant' | 'system';
       
       // Extract content - handle both string and object formats
       let content: string;
       if (typeof msg.content === 'object' && msg.content?.text) {
         content = msg.content.text;
       } else if (typeof msg.content === 'string') {
         content = msg.content;
       } else if (msg.message) {
         content = msg.message;
       } else {
         return null; // Invalid message
       }
       
       if (!role || !['user', 'assistant', 'system'].includes(role)) {
         return null;
       }
       
       return { role, content };
     })
     .filter((msg): msg is { role: 'user' | 'assistant' | 'system'; content: string } => msg !== null);
   ```

**Files Modified:**
- `src/gateway/services/ChatSessionManager.ts` - Model normalization
- `src/gateway/services/AgentService.ts` - Reasoning effort config & message parsing
- `src/gateway/websocket/agent.ts` - Removed debug logging

### 📚 References

**AI SDK Documentation:**
- [Get started with GPT-5](https://ai-sdk.dev/cookbook/guides/gpt-5)
- [OpenAI Responses API](https://ai-sdk.dev/docs/guides/openai-responses)

**Key Points from Docs:**
- GPT-5.2 models use the Responses API with steerable reasoning controls
- `reasoningEffort` values: `none`, `low`, `medium`, `high`, `xhigh`
- Configure via `providerOptions.openai.reasoningEffort` in AI SDK
- Model name is just `gpt-5.2` (not `gpt-5.2-low`, etc.)

### 🎯 Current Status

**Working:**
- ✅ Electron v40 app launches successfully
- ✅ Gateway starts and loads API keys from macOS Keychain
- ✅ WebSocket connection established
- ✅ Model name normalization (gpt-5.2-low → gpt-5.2)
- ✅ Reasoning effort passed to AI SDK
- ✅ Message history properly formatted
- ✅ System prompt included

**Ready to Test:**
- GPT-5.2 with reasoning effort variations (low, medium, high, xhigh)
- Full chat streaming with reasoning models
- Parallel streaming across multiple chat tabs

### 🔧 How Model Selection Works Now

1. **UI Model Picker** (`ui/constants/models.ts`):
   - Displays: "GPT-5.2 (Low Reasoning)", "GPT-5.2 (High Reasoning)", etc.
   - Sends config with: `model: "gpt-5.2-low"`, `reasoning: { effort: "low" }`

2. **ChatSessionManager** (`src/gateway/services/ChatSessionManager.ts`):
   - Normalizes: `"gpt-5.2-low"` → `"gpt-5.2"`
   - Creates AI SDK model: `openai("gpt-5.2")`

3. **AgentService** (`src/gateway/services/AgentService.ts`):
   - Extracts: `config.reasoning.effort` → `"low"`
   - Passes to AI SDK: `providerOptions: { openai: { reasoningEffort: "low" } }`

4. **AI SDK**:
   - Sends to OpenAI: `POST /v1/responses` with model `"gpt-5.2"` and `reasoning.effort = "low"`

### 🚀 Next Steps

Restart the app with `npm start` and test sending messages with different GPT-5.2 reasoning levels!
