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BUILDER_ERROR_FIXES_SUMMARY.md

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+# Builder Page Error Fixes - Summary
+
+This document summarizes the fixes applied to resolve two critical issues with the builder page reported by the user.
+
+## Issues Fixed
+
+### ✅ Issue 1: Model Selector Unselects After a Few Seconds
+**Symptom**: User selects a model from dropdown, but it reverts after 2-3 seconds
+
+**Root Cause**: `refreshCurrentSession()` overwrites user's selection with server state
+
+**Solution**: Added `userJustChangedModel` flag to prevent server from overwriting during refresh
+
+**Files Modified**: `chat/public/builder.js`
+
+### ✅ Issue 2: Message Text Disappears But No Message Sent  
+**Symptom**: User types message and clicks send, text disappears but nothing is sent
+
+**Root Cause**: Input cleared before ensuring session exists
+
+**Solution**: Moved input clearing to after session confirmation
+
+**Files Modified**: `chat/public/builder.html`
+
+## Quick Test Guide
+
+### Test Model Selector:
+1. Open builder page
+2. Select a different model from dropdown
+3. Wait 5 seconds
+4. **Result**: Model should stay selected ✓
+
+### Test Message Sending:
+1. Open builder page (fresh or without session)
+2. Type: "Create a contact form plugin"
+3. Click send immediately
+4. **Result**: Message should be sent, input cleared only after success ✓
+
+## Technical Implementation
+
+### Model Selector Fix (builder.js)
+```javascript
+let userJustChangedModel = false;  // New flag
+
+// Set flag when user changes model
+if (!programmaticModelChange) {
+  userJustChangedModel = true;
+}
+await refreshCurrentSession();
+setTimeout(() => { userJustChangedModel = false; }, 500);
+
+// Skip model update during refresh if user just changed it
+if (session.model && !userJustChangedModel) {
+  el.modelSelect.value = session.model;
+}
+```
+
+### Message Sending Fix (builder.html)
+```javascript
+// REMOVED early input clearing
+// input.value = '';  ❌
+
+// Input now cleared AFTER session confirmed
+await sendPlanMessage(content);
+
+// Inside sendPlanMessage:
+await ensureSessionExists();
+if (!state.currentSessionId) {
+  return;  // Keep input if session failed
+}
+input.value = '';  // ✅ Clear only after session OK
+```
+
+## Impact
+- ✅ Model selection now works reliably
+- ✅ No message data loss
+- ✅ Better user experience
+- ✅ No breaking changes to existing functionality
+
+## Testing Status
+- [x] Code changes implemented
+- [x] Logic flow verified
+- [x] Root causes addressed
+- [ ] Manual testing in running application (requires Docker setup)
+
+The fixes are minimal, surgical changes that address the specific root causes without affecting other functionality.