fix(core): resolve nested plan directory duplication and relative path policies (#25138)

packages/core/src/tools/write-file.test.ts

@@ -76,6 +76,7 @@ vi.mocked(IdeClient.getInstance).mockResolvedValue(
 const fsService = new StandardFileSystemService();
 const mockConfigInternal = {
   getTargetDir: () => rootDir,
+  getProjectRoot: () => rootDir,
   getApprovalMode: vi.fn(() => ApprovalMode.DEFAULT),
   setApprovalMode: vi.fn(),
   getGeminiClient: vi.fn(), // Initialize as a plain mock function
@@ -1113,4 +1114,26 @@ describe('WriteFileTool', () => {
       );
     });
   });
+
+  describe('plan mode path handling', () => {
+    const abortSignal = new AbortController().signal;
+
+    it('should correctly resolve nested paths in plan mode', async () => {
+      vi.mocked(mockConfig.isPlanMode).mockReturnValue(true);
+      // Extend storage mock with getPlansDir
+      mockConfig.storage.getPlansDir = vi.fn().mockReturnValue(plansDir);
+
+      const nestedFilePath = 'conductor/tracks/test.md';
+      const invocation = tool.build({
+        file_path: nestedFilePath,
+        content: 'nested content',
+      });
+
+      await invocation.execute({ abortSignal });
+
+      const expectedWritePath = path.join(plansDir, 'conductor/tracks/test.md');
+      expect(fs.existsSync(expectedWritePath)).toBe(true);
+      expect(fs.readFileSync(expectedWritePath, 'utf8')).toBe('nested content');
+    });
+  });
 });