diff --git a/src/services/rules-builder/rules-generation-strategies/MultiFileRulesStrategy.ts b/src/services/rules-builder/rules-generation-strategies/MultiFileRulesStrategy.ts
index 124b632..ee7f2dd 100644
--- a/src/services/rules-builder/rules-generation-strategies/MultiFileRulesStrategy.ts
+++ b/src/services/rules-builder/rules-generation-strategies/MultiFileRulesStrategy.ts
@@ -1,8 +1,14 @@
 import type { RulesGenerationStrategy } from '../RulesGenerationStrategy.ts';
 import { Layer, type Library, Stack } from '../../../data/dictionaries.ts';
 import type { RulesContent } from '../RulesBuilderTypes.ts';
-import { getRulesForLibrary } from '../../../data/rules';
 import { slugify } from '../../../utils/slugify.ts';
+import {
+  createProjectMarkdown,
+  createEmptyStateMarkdown,
+  generateLibraryContent,
+  renderLibrarySection,
+  PROJECT_FILE_CONFIG,
+} from './shared/rulesMarkdownBuilders.ts';
 
 /**
  * Strategy for multi-file rules generation
@@ -15,17 +21,17 @@ export class MultiFileRulesStrategy implements RulesGenerationStrategy {
     stacksByLayer: Record<Layer, Stack[]>,
     librariesByStack: Record<Stack, Library[]>,
   ): RulesContent[] {
-    const projectMarkdown = `# AI Rules for ${projectName}\n\n${projectDescription}\n\n`;
-    const noSelectedLibrariesMarkdown = `---\n\n👈 Use the Rule Builder on the left or drop dependency file here`;
-    const projectLabel = 'Project',
-      projectFileName = 'project.mdc';
-
+    const projectMarkdown = createProjectMarkdown(projectName, projectDescription);
     const markdowns: RulesContent[] = [];
 
-    markdowns.push({ markdown: projectMarkdown, label: projectLabel, fileName: projectFileName });
+    markdowns.push({
+      markdown: projectMarkdown,
+      label: PROJECT_FILE_CONFIG.label,
+      fileName: PROJECT_FILE_CONFIG.fileName,
+    });
 
     if (selectedLibraries.length === 0) {
-      markdowns[0].markdown += noSelectedLibrariesMarkdown;
+      markdowns[0].markdown += createEmptyStateMarkdown();
       return markdowns;
     }
 
@@ -37,7 +43,6 @@ export class MultiFileRulesStrategy implements RulesGenerationStrategy {
               layer,
               stack,
               library,
-              libraryRules: getRulesForLibrary(library),
             }),
           );
         });
@@ -48,39 +53,18 @@ export class MultiFileRulesStrategy implements RulesGenerationStrategy {
   }
 
   private buildRulesContent({
-    libraryRules,
     layer,
     stack,
     library,
   }: {
-    libraryRules: string[];
     layer: string;
     stack: string;
     library: string;
   }): RulesContent {
     const label = `${layer} - ${stack} - ${library}`;
     const fileName: RulesContent['fileName'] = `${slugify(`${layer}-${stack}-${library}`)}.mdc`;
-    const content =
-      libraryRules.length > 0
-        ? `${libraryRules.map((rule) => `- ${rule}`).join('\n')}`
-        : `- Use ${library} according to best practices`;
-    const markdown = this.renderRuleMarkdown({ content, layer, stack, library });
+    const content = generateLibraryContent(library as Library);
+    const markdown = renderLibrarySection({ layer, stack, library, content });
     return { markdown, label, fileName };
   }
-
-  private renderRuleMarkdown = ({
-    content,
-    layer,
-    stack,
-    library,
-  }: {
-    content: string;
-    layer: string;
-    stack: string;
-    library: string;
-  }) =>
-    `## ${layer}\n\n### Guidelines for ${stack}\n\n#### ${library}\n\n{{content}}\n\n`.replace(
-      '{{content}}',
-      content,
-    );
 }
diff --git a/src/services/rules-builder/rules-generation-strategies/SingleFileRulesStrategy.ts b/src/services/rules-builder/rules-generation-strategies/SingleFileRulesStrategy.ts
index 467c9e7..95a98ef 100644
--- a/src/services/rules-builder/rules-generation-strategies/SingleFileRulesStrategy.ts
+++ b/src/services/rules-builder/rules-generation-strategies/SingleFileRulesStrategy.ts
@@ -1,7 +1,12 @@
 import type { RulesGenerationStrategy } from '../RulesGenerationStrategy.ts';
 import { Layer, Library, Stack } from '../../../data/dictionaries.ts';
 import type { RulesContent } from '../RulesBuilderTypes.ts';
-import { getRulesForLibrary } from '../../../data/rules.ts';
+import {
+  createProjectMarkdown,
+  createEmptyStateMarkdown,
+  generateLibrarySections,
+  PROJECT_FILE_CONFIG,
+} from './shared/rulesMarkdownBuilders.ts';
 
 /**
  * Strategy for single-file rules generation
@@ -14,58 +19,20 @@ export class SingleFileRulesStrategy implements RulesGenerationStrategy {
     stacksByLayer: Record<Layer, Stack[]>,
     librariesByStack: Record<Stack, Library[]>,
   ): RulesContent[] {
-    const projectMarkdown = `# AI Rules for ${projectName}\n\n${projectDescription}\n\n`;
-    const noSelectedLibrariesMarkdown = `---\n\n👈 Use the Rule Builder on the left or drop dependency file here`;
-    const projectLabel = 'Project',
-      projectFileName = 'project.mdc';
-
-    let markdown = projectMarkdown;
+    let markdown = createProjectMarkdown(projectName, projectDescription);
 
     if (selectedLibraries.length === 0) {
-      markdown += noSelectedLibrariesMarkdown;
-      return [{ markdown, label: projectLabel, fileName: projectFileName }];
+      markdown += createEmptyStateMarkdown();
+      return [
+        {
+          markdown,
+          label: PROJECT_FILE_CONFIG.label,
+          fileName: PROJECT_FILE_CONFIG.fileName,
+        },
+      ];
     }
 
-    markdown += this.generateLibraryMarkdown(stacksByLayer, librariesByStack);
+    markdown += generateLibrarySections(stacksByLayer, librariesByStack);
     return [{ markdown, label: 'All Rules', fileName: 'rules.mdc' }];
   }
-
-  private generateLibraryMarkdown(
-    stacksByLayer: Record<Layer, Stack[]>,
-    librariesByStack: Record<Stack, Library[]>,
-  ): string {
-    let markdown = '';
-
-    // Generate content for each layer and its stacks
-    Object.entries(stacksByLayer).forEach(([layer, stacks]) => {
-      markdown += `## ${layer}\n\n`;
-
-      stacks.forEach((stack) => {
-        markdown += `### Guidelines for ${stack}\n\n`;
-
-        const libraries = librariesByStack[stack];
-        if (libraries) {
-          libraries.forEach((library) => {
-            markdown += `#### ${library}\n\n`;
-
-            // Get specific rules for this library
-            const libraryRules = getRulesForLibrary(library);
-            if (libraryRules.length > 0) {
-              libraryRules.forEach((rule) => {
-                markdown += `- ${rule}\n`;
-              });
-            } else {
-              markdown += `- Use ${library} according to best practices\n`;
-            }
-
-            markdown += '\n';
-          });
-        }
-
-        markdown += '\n';
-      });
-    });
-
-    return markdown;
-  }
 }
diff --git a/src/services/rules-builder/rules-generation-strategies/shared/rulesMarkdownBuilders.ts b/src/services/rules-builder/rules-generation-strategies/shared/rulesMarkdownBuilders.ts
new file mode 100644
index 0000000..0f30afe
--- /dev/null
+++ b/src/services/rules-builder/rules-generation-strategies/shared/rulesMarkdownBuilders.ts
@@ -0,0 +1,87 @@
+import type { Layer, Library, Stack } from '../../../../data/dictionaries.ts';
+import { getRulesForLibrary } from '../../../../data/rules.ts';
+
+/**
+ * Creates the project header markdown
+ */
+export function createProjectMarkdown(projectName: string, projectDescription: string): string {
+  return `# AI Rules for ${projectName}\n\n${projectDescription}\n\n`;
+}
+
+/**
+ * Creates the empty state markdown
+ */
+export function createEmptyStateMarkdown(): string {
+  return `---\n\n👈 Use the Rule Builder on the left or drop dependency file here`;
+}
+
+/**
+ * Generates markdown for a single library
+ */
+export function generateLibraryContent(library: Library): string {
+  const libraryRules = getRulesForLibrary(library);
+
+  if (libraryRules.length > 0) {
+    return libraryRules.map((rule) => `- ${rule}`).join('\n');
+  }
+
+  return `- Use ${library} according to best practices`;
+}
+
+/**
+ * Renders a complete library section with headers
+ */
+export function renderLibrarySection({
+  layer,
+  stack,
+  library,
+  content,
+}: {
+  layer: string;
+  stack: string;
+  library: string;
+  content?: string;
+}): string {
+  const finalContent = content ?? generateLibraryContent(library as Library);
+
+  return `## ${layer}\n\n### Guidelines for ${stack}\n\n#### ${library}\n\n${finalContent}\n\n`;
+}
+
+/**
+ * Generates markdown for all libraries organized by layer and stack
+ */
+export function generateLibrarySections(
+  stacksByLayer: Record<Layer, Stack[]>,
+  librariesByStack: Record<Stack, Library[]>,
+): string {
+  let markdown = '';
+
+  Object.entries(stacksByLayer).forEach(([layer, stacks]) => {
+    markdown += `## ${layer}\n\n`;
+
+    stacks.forEach((stack) => {
+      markdown += `### Guidelines for ${stack}\n\n`;
+
+      const libraries = librariesByStack[stack];
+      if (libraries) {
+        libraries.forEach((library) => {
+          markdown += `#### ${library}\n\n`;
+          markdown += generateLibraryContent(library);
+          markdown += '\n\n';
+        });
+      }
+
+      markdown += '\n';
+    });
+  });
+
+  return markdown;
+}
+
+/**
+ * Default project file configuration
+ */
+export const PROJECT_FILE_CONFIG = {
+  label: 'Project',
+  fileName: 'project.mdc',
+} as const;