diff --git a/src/utils/skill-metadata.ts b/src/utils/skill-metadata.ts
index bf720b3..11164a7 100644
--- a/src/utils/skill-metadata.ts
+++ b/src/utils/skill-metadata.ts
@@ -1,6 +1,10 @@
 import { existsSync, readFileSync, writeFileSync } from 'fs';
 import { join } from 'path';
 
+function normalizePathSeparators(path: string): string {
+  return path.replace(/\\/g, '/');
+}
+
 export const SKILL_METADATA_FILE = '.openskills.json';
 
 export type SkillSourceType = 'git' | 'github' | 'local';
@@ -30,6 +34,8 @@ export function writeSkillMetadata(skillDir: string, metadata: SkillSourceMetada
   const metadataPath = join(skillDir, SKILL_METADATA_FILE);
   const payload = {
     ...metadata,
+    subpath: metadata.subpath ? normalizePathSeparators(metadata.subpath) : undefined,
+    localPath: metadata.localPath ? normalizePathSeparators(metadata.localPath) : undefined,
     installedAt: metadata.installedAt || new Date().toISOString(),
   };
   writeFileSync(metadataPath, JSON.stringify(payload, null, 2));
diff --git a/tests/utils/skill-metadata.test.ts b/tests/utils/skill-metadata.test.ts
index 57cf036..be965b4 100644
--- a/tests/utils/skill-metadata.test.ts
+++ b/tests/utils/skill-metadata.test.ts
@@ -38,4 +38,33 @@ describe('skill-metadata', () => {
     writeFileSync(join(tempDir, SKILL_METADATA_FILE), '{not-json');
     expect(readSkillMetadata(tempDir)).toBeNull();
   });
+
+  it('normalizes Windows backslashes to forward slashes in subpath', () => {
+    const payload = {
+      source: 'owner/repo',
+      sourceType: 'git' as const,
+      repoUrl: 'https://github.com/owner/repo',
+      subpath: 'skills\\nested\\skill',
+      installedAt: '2026-01-01T00:00:00.000Z',
+    };
+
+    writeSkillMetadata(tempDir, payload);
+    const read = readSkillMetadata(tempDir);
+
+    expect(read?.subpath).toBe('skills/nested/skill');
+  });
+
+  it('normalizes Windows backslashes to forward slashes in localPath', () => {
+    const payload = {
+      source: '/path/to/skill',
+      sourceType: 'local' as const,
+      localPath: 'C:\\Users\\test\\skills\\my-skill',
+      installedAt: '2026-01-01T00:00:00.000Z',
+    };
+
+    writeSkillMetadata(tempDir, payload);
+    const read = readSkillMetadata(tempDir);
+
+    expect(read?.localPath).toBe('C:/Users/test/skills/my-skill');
+  });
 });