diff --git a/src/renderer/store/utils/pathResolution.ts b/src/renderer/store/utils/pathResolution.ts
index 43b58f0f..8984f710 100644
--- a/src/renderer/store/utils/pathResolution.ts
+++ b/src/renderer/store/utils/pathResolution.ts
@@ -27,6 +27,10 @@ export function resolveFilePath(base: string, relativePath: string): string {
     cleanRelative = cleanRelative.slice(1);
   }
 
+  if (isAbsolutePath(cleanRelative)) {
+    return cleanRelative;
+  }
+
   // Tilde paths (~/) are home-relative absolute paths - pass through as-is
   // The main process will expand ~ to the actual home directory
   if (cleanRelative.startsWith('~/') || cleanRelative.startsWith('~\\') || cleanRelative === '~') {
diff --git a/src/renderer/utils/claudeMdTracker.ts b/src/renderer/utils/claudeMdTracker.ts
index ac045070..661f0e95 100644
--- a/src/renderer/utils/claudeMdTracker.ts
+++ b/src/renderer/utils/claudeMdTracker.ts
@@ -99,6 +99,9 @@ function joinPaths(base: string, relative: string): string {
   if (cleanRelative.startsWith('@')) {
     cleanRelative = cleanRelative.slice(1);
   }
+  if (isAbsolutePath(cleanRelative)) {
+    return cleanRelative;
+  }
 
   // Handle ./ prefix (current directory)
   if (cleanRelative.startsWith('./') || cleanRelative.startsWith('.\\')) {
diff --git a/src/renderer/utils/contextTracker.ts b/src/renderer/utils/contextTracker.ts
index ec8ecd8e..e9bd85f9 100644
--- a/src/renderer/utils/contextTracker.ts
+++ b/src/renderer/utils/contextTracker.ts
@@ -482,6 +482,9 @@ function joinPaths(base: string, relative: string): string {
   if (cleanRelative.startsWith('@')) {
     cleanRelative = cleanRelative.slice(1);
   }
+  if (isAbsolutePath(cleanRelative)) {
+    return cleanRelative;
+  }
 
   // Handle ./ prefix (current directory)
   if (cleanRelative.startsWith('./') || cleanRelative.startsWith('.\\')) {
diff --git a/test/renderer/store/pathResolution.test.ts b/test/renderer/store/pathResolution.test.ts
index 218390dc..c6331c4b 100644
--- a/test/renderer/store/pathResolution.test.ts
+++ b/test/renderer/store/pathResolution.test.ts
@@ -41,6 +41,14 @@ describe('resolveFilePath', () => {
     expect(resolveFilePath('/repo', '@~/some/file.ts')).toBe('~/some/file.ts');
   });
 
+  it('passes through @-prefixed absolute paths after stripping the mention marker', () => {
+    expect(resolveFilePath('/repo', '@/outside/file.ts')).toBe('/outside/file.ts');
+    expect(resolveFilePath('C:\\repo', '@C:\\outside\\file.ts')).toBe('C:\\outside\\file.ts');
+    expect(resolveFilePath('C:\\repo', '@\\\\server\\share\\file.ts')).toBe(
+      '\\\\server\\share\\file.ts'
+    );
+  });
+
   it('passes through bare tilde as-is', () => {
     expect(resolveFilePath('/repo', '~')).toBe('~');
   });
diff --git a/test/renderer/utils/claudeMdTracker.test.ts b/test/renderer/utils/claudeMdTracker.test.ts
index 32f2199d..fa1c28b9 100644
--- a/test/renderer/utils/claudeMdTracker.test.ts
+++ b/test/renderer/utils/claudeMdTracker.test.ts
@@ -195,4 +195,13 @@ describe('extractUserMentionPaths Windows paths', () => {
       ['~\\.claude\\CLAUDE.md']
     );
   });
+
+  it('strips mention markers before preserving absolute mention paths', () => {
+    expect(extractUserMentionPaths(userGroupWithPath('@C:\\Other\\file.ts'), 'C:\\Repo')).toEqual([
+      'C:\\Other\\file.ts',
+    ]);
+    expect(
+      extractUserMentionPaths(userGroupWithPath('@\\\\server\\share\\file.ts'), 'C:\\Repo')
+    ).toEqual(['\\\\server\\share\\file.ts']);
+  });
 });