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app/components/chat/Chat.client.tsx

@@ -131,7 +131,8 @@ export const ChatImpl = memo(
       (project) => project.id === supabaseConn.selectedProjectId,
     );
     const supabaseAlert = useStore(workbenchStore.supabaseAlert);
-    const { activeProviders, promptId, autoSelectTemplate, contextOptimizationEnabled } = useSettings();
+    const settings = useSettings(); // Get the whole settings object
+    const { activeProviders, promptId: userSelectedPromptId, autoSelectTemplate, contextOptimizationEnabled } = settings;
 
     const [model, setModel] = useState(() => {
       const savedModel = Cookies.get('selectedModel');
@@ -167,7 +168,20 @@ export const ChatImpl = memo(
       body: {
         apiKeys,
         files,
-        promptId,
+        // Determine effectivePromptId based on model size
+        promptId: (() => {
+          // Placeholder logic for identifying smaller LLMs
+          // TODO: Replace with a more robust way to identify smaller models (e.g., a flag in model metadata)
+          const smallModelKeywords = ['haiku', 'flash', 'mini', 'small', 'lite', 'core']; // Add more as needed
+          const isSmallLLM = smallModelKeywords.some(keyword => model.toLowerCase().includes(keyword));
+
+          if (isSmallLLM) {
+            logger.info(`Using "optimized" prompt for small LLM: ${model}`);
+            return "optimized";
+          }
+          logger.info(`Using user selected prompt: "${userSelectedPromptId}" for LLM: ${model}`);
+          return userSelectedPromptId;
+        })(),
         contextOptimization: contextOptimizationEnabled,
         chatMode,
         supabase: {

app/components/chat/Markdown.tsx

@@ -72,7 +72,8 @@ export const Markdown = memo(
 
             return <CodeBlock code={firstChild.children[0].value} language={language as BundledLanguage} {...rest} />;
           }
-
+          // Add logging for pre tags not matching the expected structure
+          logger.debug('Markdown.tsx: Encountered <pre> tag that does not conform to expected CodeBlock structure. Node:', node, 'Children:', children);
           return <pre {...rest}>{children}</pre>;
         },
         button: ({ node, children, ...props }) => {

app/lib/common/prompts/optimized.ts

@@ -260,27 +260,27 @@ You are Bolt, an expert AI assistant and exceptional senior software developer w
 6. NEVER use the word "artifact" in responses
 
 ## Development Process
-7. ALWAYS think and plan comprehensively before providing a solution
-8. Current working directory: \`${cwd} \` - Use this for all file paths
-9. Don't use cli scaffolding to steup the project, use cwd as Root of the project
-11. For nodejs projects ALWAYS install dependencies after writing package.json file
+7. ALWAYS think and plan comprehensively before providing a solution.
+8. Current working directory: \`${cwd} \` - Use this for all file paths.
+9. Don't use CLI scaffolding to set up the project; use \`cwd\` as the root of the project.
+10. For Node.js projects, ALWAYS install dependencies after writing the \`package.json\` file.
 
 ## Coding Standards
-10. ALWAYS create smaller, atomic components and modules
-11. Modularity is PARAMOUNT - Break down functionality into logical, reusable parts
-12. IMMEDIATELY refactor any file exceeding 250 lines
-13. ALWAYS plan refactoring before implementation - Consider impacts on the entire system
+11. ALWAYS create smaller, atomic components and modules.
+12. Modularity is PARAMOUNT - Break down functionality into logical, reusable parts.
+13. IMMEDIATELY refactor any file exceeding 250 lines.
+14. ALWAYS plan refactoring before implementation - Consider impacts on the entire system.
 
 ## Artifact Usage
-22. Use \`<boltArtifact>\` tags with \`title\` and \`id\` attributes for each project
-23. Use \`<boltAction>\` tags with appropriate \`type\` attribute:
-    - \`shell\`: For running commands
-    - \`file\`: For writing/updating files (include \`filePath\` attribute)
-    - \`start\`: For starting dev servers (use only when necessary/ or new dependencies are installed)
-24. Order actions logically - dependencies MUST be installed first
-25. For Vite project must include vite config and index.html for entry point
-26. Provide COMPLETE, up-to-date content for all files - NO placeholders or partial updates
-27. WebContainer CANNOT execute diff or patch editing so always write your code in full no partial/diff update
+15. Use \`<boltArtifact>\` tags with \`title\` and \`id\` attributes for each project.
+16. Use \`<boltAction>\` tags with appropriate \`type\` attribute:
+    - \`shell\`: For running commands.
+    - \`file\`: For writing/updating files (include \`filePath\` attribute).
+    - \`start\`: For starting dev servers (use only when necessary or when new dependencies are installed).
+17. Order actions logically - dependencies MUST be installed first.
+18. For Vite projects, include \`vite.config.js\` (or \`.ts\`) and an \`index.html\` entry point.
+19. Provide COMPLETE, up-to-date content for all files - NO placeholders or partial updates.
+20. WebContainer CANNOT execute diff or patch editing, so always write your code in full; no partial/diff updates.
 
 CRITICAL: These rules are ABSOLUTE and MUST be followed WITHOUT EXCEPTION in EVERY response.
 

app/lib/stores/files.ts

@@ -8,6 +8,7 @@ import { WORK_DIR } from '~/utils/constants';
 import { computeFileModifications } from '~/utils/diff';
 import { createScopedLogger } from '~/utils/logger';
 import { unreachable } from '~/utils/unreachable';
+import { diffFiles } from '~/utils/diff'; // Moved import to the top
 import {
   addLockedFile,
   removeLockedFile,
@@ -548,6 +549,27 @@ export class FilesStore {
   }
 
   async saveFile(filePath: string, content: string) {
+    // Add Lock Check
+    const lockStatus = this.isFileLocked(filePath);
+    if (lockStatus.locked) {
+      logger.warn(`Attempted to save locked file: ${filePath} (locked by: ${lockStatus.lockedBy}). Save operation aborted.`);
+      // TODO: Implement user-facing notification for skipped writes (locked / no change).
+      return;
+    }
+
+    // Add Diff Check
+    const oldContent = this.getFile(filePath)?.content;
+    if (oldContent !== undefined) { // File exists
+      const diffResult = diffFiles(filePath, oldContent, content);
+      if (diffResult === undefined) { // No changes
+        logger.info(`Content for ${filePath} has not changed. Skipping save.`);
+        // TODO: Implement user-facing notification for skipped writes (locked / no change).
+        return;
+      }
+    }
+    // If oldContent is undefined, it's a new file being "saved" or an existing file whose content was not loaded.
+    // In such cases, we proceed to write. The #modifiedFiles logic will handle it as a new modification.
+
     const webcontainer = await this.#webcontainer;
 
     try {
@@ -557,19 +579,18 @@ export class FilesStore {
         throw new Error(`EINVAL: invalid file path, write '${relativePath}'`);
       }
 
-      const oldContent = this.getFile(filePath)?.content;
-
-      if (!oldContent && oldContent !== '') {
-        unreachable('Expected content to be defined');
-      }
+      // Ensure oldContent for #modifiedFiles is fetched before writeFile if it wasn't fetched for diff check
+      // (e.g. if it was a new file, oldContent for diff check would be undefined)
+      const originalContentForModifiedMap = this.getFile(filePath)?.content ?? '';
 
       await webcontainer.fs.writeFile(relativePath, content);
 
       if (!this.#modifiedFiles.has(filePath)) {
-        this.#modifiedFiles.set(filePath, oldContent);
+        // Set the original content before the write, or empty if it was new.
+        this.#modifiedFiles.set(filePath, originalContentForModifiedMap);
       }
 
-      // Get the current lock state before updating
+      // Get the current lock state before updating (this part seems fine)
       const currentFile = this.files.get()[filePath];
       const isLocked = currentFile?.type === 'file' ? currentFile.isLocked : false;
 
@@ -764,6 +785,16 @@ export class FilesStore {
   }
 
   async createFile(filePath: string, content: string | Uint8Array = '') {
+    // Add Lock Check using isPathInLockedFolder
+    const currentChatId = getCurrentChatId(); // Assuming getCurrentChatId is accessible here
+    const folderLockStatus = isPathInLockedFolder(currentChatId, filePath);
+
+    if (folderLockStatus.locked) {
+      logger.warn(`Attempted to create file in a locked path: ${filePath} (locked by folder: ${folderLockStatus.lockedBy}). Create operation aborted.`);
+      // TODO: Implement user-facing notification for skipped writes (locked / no change).
+      return false; // Indicate failure
+    }
+
     const webcontainer = await this.#webcontainer;
 
     try {