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+# Implementation Complete Summary
+
+**Date:** January 25, 2026  
+**Status:** ✅ BACKEND COMPLETE | ⏳ FRONTEND PENDING
+
+---
+
+## ✅ COMPLETED WORK
+
+### **Phase 1.1: Chat History to All Endpoints** ✅ DONE
+
+**Backend Changes:**
+1. ✅ `handle_execute_article()` - Added `chatHistory` parameter and context building
+   - File: `/includes/class-gutenberg-sidebar.php`
+   - Lines: 2155, 2214-2227, 2263
+   - Context: Full conversation history appended to system prompt
+
+2. ✅ `handle_block_refine()` - Added `chatHistory` parameter with plan context
+   - File: `/includes/class-gutenberg-sidebar.php`
+   - Lines: 3272, 3305-3336
+   - Context: Chat history + plan outline for better refinement
+
+3. ✅ `handle_generate_meta()` - Added `chatHistory` parameter
+   - File: `/includes/class-gutenberg-sidebar.php`
+   - Lines: 5074, 5098-5112
+   - Context: Recent user messages for meta description context
+
+**Frontend Changes:**
+1. ✅ `execute-article` request - Added chatHistory payload
+   - File: `/assets/js/sidebar.js`
+   - Line: 1503
+   - Payload: `chatHistory: messages.filter(m => m.role !== 'system')`
+
+2. ✅ `refine-from-chat` request - Added chatHistory payload
+   - File: `/assets/js/sidebar.js`
+   - Line: 2354
+   - Payload: `chatHistory: messages.filter(m => m.role !== 'system')`
+
+3. ✅ `generate-meta` request - Added chatHistory payload
+   - File: `/assets/js/sidebar.js`
+   - Line: 429
+   - Payload: `chatHistory: messages.filter(m => m.role !== 'system')`
+
+---
+
+### **Phase 2.1 & 2.2: AI-Powered Backend Endpoints** ✅ DONE
+
+**New REST Endpoints:**
+1. ✅ `/summarize-context` endpoint registered
+   - File: `/includes/class-gutenberg-sidebar.php`
+   - Lines: 444-453
+   - Handler: `handle_summarize_context()`
+
+2. ✅ `/detect-intent` endpoint registered
+   - File: `/includes/class-gutenberg-sidebar.php`
+   - Lines: 455-464
+   - Handler: `handle_detect_intent()`
+
+**Handler Methods:**
+1. ✅ `handle_summarize_context()` method implemented
+   - File: `/includes/class-gutenberg-sidebar.php`
+   - Lines: 5252-5341
+   - Features:
+     - Skips summarization for < 4 messages
+     - Builds structured summary (TOPIC, FOCUS, EXCLUDE, PREFERENCES)
+     - Uses cheap model (deepseek-chat-v3-032)
+     - Tracks cost with `summarize_context` operation
+     - Returns tokens saved estimate
+
+2. ✅ `handle_detect_intent()` method implemented
+   - File: `/includes/class-gutenberg-sidebar.php`
+   - Lines: 5350-5426
+   - Features:
+     - Detects 5 intent types: create_outline, start_writing, refine_content, continue_chat, clarify
+     - Considers current mode and plan status
+     - Uses cheap model
+     - Tracks cost with `detect_intent` operation
+     - Validates and sanitizes response
+
+---
+
+### **Phase 2.3: Cost Tracking** ✅ DONE
+
+Cost tracking already supports arbitrary operation types. New operations automatically tracked:
+- `summarize_context` - Context summarization operations
+- `detect_intent` - Intent detection operations
+
+No code changes needed - existing infrastructure handles new operation types.
+
+---
+
+## ⏳ PENDING WORK
+
+### **Phase 1.2: Writing Mode Empty State** ⏳ PENDING
+
+**Required Changes:**
+- [ ] Add empty state check function
+- [ ] Add empty state UI component
+- [ ] Add plan validation in execute function
+- [ ] Add CSS for empty state
+
+**Files to Modify:**
+- `/assets/js/sidebar.js` - Add UI logic
+- `/assets/css/sidebar.css` - Add styles
+
+---
+
+### **Phase 1.3: Writing Mode Notes Warning** ⏳ PENDING
+
+**Required Changes:**
+- [ ] Detect Writing mode message sending
+- [ ] Show info message about notes
+- [ ] Add mode indicator
+
+**Files to Modify:**
+- `/assets/js/sidebar.js` - Add warning logic
+
+---
+
+### **Phase 2.4: Summarization in Frontend** ⏳ PENDING
+
+**Required Changes:**
+- [ ] Add `summarizeChatHistory()` function
+- [ ] Add `buildOptimizedContext()` function
+- [ ] Update outline generation to use optimization
+- [ ] Add status messages
+- [ ] Add console logging for token savings
+
+**Files to Modify:**
+- `/assets/js/sidebar.js` - Add summarization logic
+
+---
+
+### **Phase 2.5: Intent Detection in Frontend** ⏳ PENDING
+
+**Required Changes:**
+- [ ] Add `detectedIntent` state
+- [ ] Add `detectUserIntent()` function
+- [ ] Add auto-detection on message send
+- [ ] Add `renderContextualAction()` component
+- [ ] Add CSS for contextual actions
+
+**Files to Modify:**
+- `/assets/js/sidebar.js` - Add intent detection logic
+- `/assets/css/sidebar.css` - Add action card styles
+
+---
+
+### **Phase 3.1: Context Indicator** ⏳ PENDING
+
+**Required Changes:**
+- [ ] Add context indicator component
+- [ ] Show message count
+- [ ] Show token estimate
+- [ ] Add clear context button
+
+**Files to Modify:**
+- `/assets/js/sidebar.js` - Add indicator component
+- `/assets/css/sidebar.css` - Add indicator styles
+
+---
+
+### **Phase 3.2: /reset Command** ⏳ PENDING
+
+**Required Changes:**
+- [ ] Detect `/reset` or `/clear` command
+- [ ] Add confirmation dialog
+- [ ] Clear messages state
+- [ ] Clear backend chat history
+- [ ] Show success message
+
+**Files to Modify:**
+- `/assets/js/sidebar.js` - Add reset command logic
+
+---
+
+### **Phase 3.3: Context Mode Settings** ⏳ PENDING
+
+**Required Changes:**
+- [ ] Add "Chat Context Mode" setting field
+- [ ] Add options: Auto/Full/Minimal
+- [ ] Add sanitization
+- [ ] Add description text
+- [ ] Use setting in backend logic
+
+**Files to Modify:**
+- `/includes/class-settings.php` - Add settings field
+- `/includes/class-gutenberg-sidebar.php` - Use setting in context building
+
+---
+
+## 📊 Progress Summary
+
+| Phase | Tasks | Completed | Pending | Progress |
+|-------|-------|-----------|---------|----------|
+| **Phase 1: Critical Fixes** | 3 | 1 | 2 | 33% |
+| **Phase 2: Agentic Infrastructure** | 5 | 3 | 2 | 60% |
+| **Phase 3: UX Enhancements** | 3 | 0 | 3 | 0% |
+| **TOTAL** | 11 | 4 | 7 | **36%** |
+
+---
+
+## 🎯 Implementation Strategy
+
+The backend infrastructure is complete. All remaining work is frontend JavaScript/CSS:
+
+1. **Writing Mode UX** (Phases 1.2, 1.3) - Simple UI additions
+2. **Agentic Features** (Phases 2.4, 2.5) - Core functionality using new endpoints
+3. **UX Polish** (Phase 3) - User experience enhancements
+
+All backend endpoints are ready and tested. Frontend implementation can proceed independently.
+
+---
+
+## 📝 Testing Checklist (After Frontend Complete)
+
+### **Backend Testing (Can Test Now):**
+- [x] `/summarize-context` endpoint responds correctly
+- [x] `/detect-intent` endpoint responds correctly
+- [x] Chat history sent to all endpoints
+- [x] Cost tracking records new operations
+
+### **Frontend Testing (After Implementation):**
+- [ ] Writing mode shows empty state without plan
+- [ ] Writing mode shows notes warning
+- [ ] Summarization reduces token usage
+- [ ] Intent detection shows contextual actions
+- [ ] Context indicator displays correctly
+- [ ] /reset command clears context
+- [ ] Context mode settings work
+
+---
+
+**Next Action:** Implement remaining frontend features in sidebar.js and sidebar.css