feat(context): add configurable memoryBoundaryMarkers setting (#24020)

docs/reference/configuration.md

@@ -1287,6 +1287,18 @@ their corresponding top-level category object in your `settings.json` file.
   - **Description:** Maximum number of directories to search for memory.
   - **Default:** `200`
 
+- **`context.memoryBoundaryMarkers`** (array):
+  - **Description:** File or directory names that mark the boundary for
+    GEMINI.md discovery. The upward traversal stops at the first directory
+    containing any of these markers. An empty array disables parent traversal.
+  - **Default:**
+
+    ```json
+    [".git"]
+    ```
+
+  - **Requires restart:** Yes
+
 - **`context.includeDirectories`** (array):
   - **Description:** Additional directories to include in the workspace context.
     Missing directories will be skipped with a warning.

packages/cli/src/config/config.test.ts

@@ -989,6 +989,7 @@ describe('Hierarchical Memory Loading (config.ts) - Placeholder Suite', () => {
         respectGeminiIgnore: true,
       }),
       200, // maxDirs
+      ['.git'], // boundaryMarkers
     );
   });
 
@@ -1018,6 +1019,7 @@ describe('Hierarchical Memory Loading (config.ts) - Placeholder Suite', () => {
         respectGeminiIgnore: true,
       }),
       200,
+      ['.git'], // boundaryMarkers
     );
   });
 
@@ -1046,6 +1048,7 @@ describe('Hierarchical Memory Loading (config.ts) - Placeholder Suite', () => {
         respectGeminiIgnore: true,
       }),
       200,
+      ['.git'], // boundaryMarkers
     );
   });
 });

packages/cli/src/config/config.ts

@@ -642,6 +642,7 @@ export async function loadCliConfig(
       memoryImportFormat,
       memoryFileFiltering,
       settings.context?.discoveryMaxDirs,
+      settings.context?.memoryBoundaryMarkers,
     );
     memoryContent = result.memoryContent;
     fileCount = result.fileCount;
@@ -896,6 +897,7 @@ export async function loadCliConfig(
     loadMemoryFromIncludeDirectories:
       settings.context?.loadMemoryFromIncludeDirectories || false,
     discoveryMaxDirs: settings.context?.discoveryMaxDirs,
+    memoryBoundaryMarkers: settings.context?.memoryBoundaryMarkers,
     importFormat: settings.context?.importFormat,
     debugMode,
     question,

packages/cli/src/config/extension-manager-themes.spec.ts

@@ -199,6 +199,7 @@ describe('ExtensionManager theme loading', () => {
         respectGeminiIgnore: true,
       }),
       getDiscoveryMaxDirs: () => 200,
+      getMemoryBoundaryMarkers: () => ['.git'],
       getMcpClientManager: () => ({
         getMcpInstructions: () => '',
         startExtension: vi.fn().mockResolvedValue(undefined),

packages/cli/src/config/settingsSchema.ts

@@ -1291,6 +1291,19 @@ const SETTINGS_SCHEMA = {
         description: 'Maximum number of directories to search for memory.',
         showInDialog: true,
       },
+      memoryBoundaryMarkers: {
+        type: 'array',
+        label: 'Memory Boundary Markers',
+        category: 'Context',
+        requiresRestart: true,
+        default: ['.git'] as string[],
+        description:
+          'File or directory names that mark the boundary for GEMINI.md discovery. ' +
+          'The upward traversal stops at the first directory containing any of these markers. ' +
+          'An empty array disables parent traversal.',
+        showInDialog: false,
+        items: { type: 'string' },
+      },
       includeDirectories: {
         type: 'array',
         label: 'Include Directories',

packages/cli/src/test-utils/mockConfig.ts

@@ -163,6 +163,7 @@ export const createMockConfig = (overrides: Partial<Config> = {}): Config =>
     getAdminSkillsEnabled: vi.fn().mockReturnValue(false),
     getDisabledSkills: vi.fn().mockReturnValue([]),
     getExperimentalJitContext: vi.fn().mockReturnValue(false),
+    getMemoryBoundaryMarkers: vi.fn().mockReturnValue(['.git']),
     getTerminalBackground: vi.fn().mockReturnValue(undefined),
     getEmbeddingModel: vi.fn().mockReturnValue('embedding-model'),
     getQuotaErrorOccurred: vi.fn().mockReturnValue(false),

packages/core/src/config/config.ts

@@ -685,6 +685,7 @@ export interface ConfigParameters {
   experimentalAgentHistoryTruncationThreshold?: number;
   experimentalAgentHistoryRetainedMessages?: number;
   experimentalAgentHistorySummarization?: boolean;
+  memoryBoundaryMarkers?: string[];
   topicUpdateNarration?: boolean;
   toolOutputMasking?: Partial<ToolOutputMaskingConfig>;
   disableLLMCorrection?: boolean;
@@ -917,6 +918,7 @@ export class Config implements McpContext, AgentLoopContext {
   private readonly experimentalAgentHistoryTruncationThreshold: number;
   private readonly experimentalAgentHistoryRetainedMessages: number;
   private readonly experimentalAgentHistorySummarization: boolean;
+  private readonly memoryBoundaryMarkers: readonly string[];
   private readonly topicUpdateNarration: boolean;
   private readonly disableLLMCorrection: boolean;
   private readonly planEnabled: boolean;
@@ -1134,6 +1136,7 @@ export class Config implements McpContext, AgentLoopContext {
       params.experimentalAgentHistoryRetainedMessages ?? 15;
     this.experimentalAgentHistorySummarization =
       params.experimentalAgentHistorySummarization ?? false;
+    this.memoryBoundaryMarkers = params.memoryBoundaryMarkers ?? ['.git'];
     this.topicUpdateNarration = params.topicUpdateNarration ?? false;
     this.modelSteering = params.modelSteering ?? false;
     this.injectionService = new InjectionService(() =>
@@ -2310,6 +2313,10 @@ export class Config implements McpContext, AgentLoopContext {
     return this.experimentalJitContext;
   }
 
+  getMemoryBoundaryMarkers(): readonly string[] {
+    return this.memoryBoundaryMarkers;
+  }
+
   isMemoryManagerEnabled(): boolean {
     return this.experimentalMemoryManager;
   }

packages/core/src/services/contextManager.test.ts

@@ -46,6 +46,7 @@ describe('ContextManager', () => {
         getMcpInstructions: vi.fn().mockReturnValue('MCP Instructions'),
       }),
       isTrustedFolder: vi.fn().mockReturnValue(true),
+      getMemoryBoundaryMarkers: vi.fn().mockReturnValue(['.git']),
     } as unknown as Config;
 
     contextManager = new ContextManager(mockConfig);
@@ -81,12 +82,14 @@ describe('ContextManager', () => {
       await contextManager.refresh();
 
       expect(memoryDiscovery.getGlobalMemoryPaths).toHaveBeenCalled();
-      expect(memoryDiscovery.getEnvironmentMemoryPaths).toHaveBeenCalledWith([
-        '/app',
-      ]);
+      expect(memoryDiscovery.getEnvironmentMemoryPaths).toHaveBeenCalledWith(
+        ['/app'],
+        ['.git'],
+      );
       expect(memoryDiscovery.readGeminiMdFiles).toHaveBeenCalledWith(
         expect.arrayContaining([...globalPaths, ...envPaths]),
         'tree',
+        ['.git'],
       );
 
       expect(contextManager.getGlobalMemory()).toContain('Global Content');
@@ -172,6 +175,7 @@ describe('ContextManager', () => {
       expect(memoryDiscovery.readGeminiMdFiles).toHaveBeenCalledWith(
         ['/home/user/.gemini/GEMINI.md', '/app/gemini.md'],
         'tree',
+        ['.git'],
       );
       expect(contextManager.getEnvironmentMemory()).toContain(
         'Project Content',
@@ -197,6 +201,7 @@ describe('ContextManager', () => {
         ['/app'],
         expect.any(Set),
         expect.any(Set),
+        ['.git'],
       );
       expect(result).toMatch(/--- Context from: \/app\/src\/GEMINI\.md ---/);
       expect(result).toContain('Src Content');
@@ -226,5 +231,25 @@ describe('ContextManager', () => {
       expect(memoryDiscovery.loadJitSubdirectoryMemory).not.toHaveBeenCalled();
       expect(result).toBe('');
     });
+
+    it('should pass custom boundary markers from config', async () => {
+      const customMarkers = ['.monorepo-root', 'package.json'];
+      vi.mocked(mockConfig.getMemoryBoundaryMarkers).mockReturnValue(
+        customMarkers,
+      );
+      vi.mocked(memoryDiscovery.loadJitSubdirectoryMemory).mockResolvedValue({
+        files: [],
+      });
+
+      await contextManager.discoverContext('/app/src/file.ts', ['/app']);
+
+      expect(memoryDiscovery.loadJitSubdirectoryMemory).toHaveBeenCalledWith(
+        '/app/src/file.ts',
+        ['/app'],
+        expect.any(Set),
+        expect.any(Set),
+        customMarkers,
+      );
+    });
   });
 });

packages/core/src/services/contextManager.ts

@@ -51,9 +51,10 @@ export class ContextManager {
         getExtensionMemoryPaths(this.config.getExtensionLoader()),
       ),
       this.config.isTrustedFolder()
-        ? getEnvironmentMemoryPaths([
-            ...this.config.getWorkspaceContext().getDirectories(),
-          ])
+        ? getEnvironmentMemoryPaths(
+            [...this.config.getWorkspaceContext().getDirectories()],
+            this.config.getMemoryBoundaryMarkers(),
+          )
         : Promise.resolve([]),
     ]);
 
@@ -76,6 +77,7 @@ export class ContextManager {
     const allContents = await readGeminiMdFiles(
       allPaths,
       this.config.getImportFormat(),
+      this.config.getMemoryBoundaryMarkers(),
     );
 
     const loadedFilePaths = allContents
@@ -133,6 +135,7 @@ export class ContextManager {
       trustedRoots,
       this.loadedPaths,
       this.loadedFileIdentities,
+      this.config.getMemoryBoundaryMarkers(),
     );
 
     if (result.files.length === 0) {

packages/core/src/utils/memoryDiscovery.test.ts

@@ -1269,6 +1269,96 @@ included directory memory
       expect(result.files[0].path).toBe(subDirMemory);
       expect(result.files[0].content).toBe('Content without git');
     });
+
+    it('should stop at a custom boundary marker instead of .git', async () => {
+      const rootDir = await createEmptyDir(
+        path.join(testRootDir, 'custom_marker'),
+      );
+      // Use a custom marker file instead of .git
+      await createTestFile(path.join(rootDir, '.monorepo-root'), '');
+      const subDir = await createEmptyDir(path.join(rootDir, 'packages/app'));
+      const targetFile = path.join(subDir, 'file.ts');
+
+      const rootMemory = await createTestFile(
+        path.join(rootDir, DEFAULT_CONTEXT_FILENAME),
+        'Root rules',
+      );
+      const subDirMemory = await createTestFile(
+        path.join(subDir, DEFAULT_CONTEXT_FILENAME),
+        'App rules',
+      );
+
+      const result = await loadJitSubdirectoryMemory(
+        targetFile,
+        [rootDir],
+        new Set(),
+        undefined,
+        ['.monorepo-root'],
+      );
+
+      expect(result.files).toHaveLength(2);
+      expect(result.files.find((f) => f.path === rootMemory)).toBeDefined();
+      expect(result.files.find((f) => f.path === subDirMemory)).toBeDefined();
+    });
+
+    it('should support multiple boundary markers', async () => {
+      const rootDir = await createEmptyDir(
+        path.join(testRootDir, 'multi_marker'),
+      );
+      // Use a non-.git marker
+      await createTestFile(path.join(rootDir, 'package.json'), '{}');
+      const subDir = await createEmptyDir(path.join(rootDir, 'src'));
+      const targetFile = path.join(subDir, 'index.ts');
+
+      const rootMemory = await createTestFile(
+        path.join(rootDir, DEFAULT_CONTEXT_FILENAME),
+        'Root content',
+      );
+
+      const result = await loadJitSubdirectoryMemory(
+        targetFile,
+        [rootDir],
+        new Set(),
+        undefined,
+        ['.git', 'package.json'],
+      );
+
+      // Should find the root because package.json is a marker
+      expect(result.files).toHaveLength(1);
+      expect(result.files[0].path).toBe(rootMemory);
+    });
+
+    it('should disable parent traversal when boundary markers array is empty', async () => {
+      const rootDir = await createEmptyDir(
+        path.join(testRootDir, 'empty_markers'),
+      );
+      await createEmptyDir(path.join(rootDir, '.git'));
+      const subDir = await createEmptyDir(path.join(rootDir, 'subdir'));
+      const targetFile = path.join(subDir, 'target.txt');
+
+      await createTestFile(
+        path.join(rootDir, DEFAULT_CONTEXT_FILENAME),
+        'Root content',
+      );
+      const subDirMemory = await createTestFile(
+        path.join(subDir, DEFAULT_CONTEXT_FILENAME),
+        'Subdir content',
+      );
+
+      const result = await loadJitSubdirectoryMemory(
+        targetFile,
+        [rootDir],
+        new Set(),
+        undefined,
+        [],
+      );
+
+      // With empty markers, no project root is found so the trusted root
+      // is used as the ceiling. Traversal still finds files between the
+      // target path and the trusted root.
+      expect(result.files).toHaveLength(2);
+      expect(result.files.find((f) => f.path === subDirMemory)).toBeDefined();
+    });
   });
 
   it('refreshServerHierarchicalMemory should refresh memory and update config', async () => {
@@ -1341,6 +1431,7 @@ included directory memory
       getImportFormat: vi.fn().mockReturnValue('tree'),
       getFileFilteringOptions: vi.fn().mockReturnValue(undefined),
       getDiscoveryMaxDirs: vi.fn().mockReturnValue(200),
+      getMemoryBoundaryMarkers: vi.fn().mockReturnValue(['.git']),
       setUserMemory: vi.fn(),
       setGeminiMdFileCount: vi.fn(),
       setGeminiMdFilePaths: vi.fn(),

packages/core/src/utils/memoryDiscovery.ts

@@ -146,41 +146,54 @@ export async function deduplicatePathsByFileIdentity(
   };
 }
 
-async function findProjectRoot(startDir: string): Promise<string | null> {
+async function findProjectRoot(
+  startDir: string,
+  boundaryMarkers: readonly string[] = ['.git'],
+): Promise<string | null> {
+  if (boundaryMarkers.length === 0) {
+    return null;
+  }
+
   let currentDir = normalizePath(startDir);
   while (true) {
-    const gitPath = path.join(currentDir, '.git');
-    try {
-      // Check for existence only — .git can be a directory (normal repos)
-      // or a file (submodules / worktrees).
-      await fs.access(gitPath);
-      return currentDir;
-    } catch (error: unknown) {
-      // Don't log ENOENT errors as they're expected when .git doesn't exist
-      // Also don't log errors in test environments, which often have mocked fs
-      const isENOENT =
-        typeof error === 'object' &&
-        error !== null &&
-        'code' in error &&
-        // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
-        (error as { code: string }).code === 'ENOENT';
-
-      // Only log unexpected errors in non-test environments
-      // process.env['NODE_ENV'] === 'test' or VITEST are common test indicators
-      const isTestEnv =
-        process.env['NODE_ENV'] === 'test' || process.env['VITEST'];
-
-      if (!isENOENT && !isTestEnv) {
-        if (typeof error === 'object' && error !== null && 'code' in error) {
+    for (const marker of boundaryMarkers) {
+      // Sanitize: skip markers with path traversal or absolute paths
+      if (path.isAbsolute(marker) || marker.includes('..')) {
+        continue;
+      }
+      const markerPath = path.join(currentDir, marker);
+      try {
+        // Check for existence only — marker can be a directory (normal repos)
+        // or a file (submodules / worktrees).
+        await fs.access(markerPath);
+        return currentDir;
+      } catch (error: unknown) {
+        // Don't log ENOENT errors as they're expected when marker doesn't exist
+        // Also don't log errors in test environments, which often have mocked fs
+        const isENOENT =
+          typeof error === 'object' &&
+          error !== null &&
+          'code' in error &&
           // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
-          const fsError = error as { code: string; message: string };
-          logger.warn(
-            `Error checking for .git at ${gitPath}: ${fsError.message}`,
-          );
-        } else {
-          logger.warn(
-            `Non-standard error checking for .git at ${gitPath}: ${String(error)}`,
-          );
+          (error as { code: string }).code === 'ENOENT';
+
+        // Only log unexpected errors in non-test environments
+        // process.env['NODE_ENV'] === 'test' or VITEST are common test indicators
+        const isTestEnv =
+          process.env['NODE_ENV'] === 'test' || process.env['VITEST'];
+
+        if (!isENOENT && !isTestEnv) {
+          if (typeof error === 'object' && error !== null && 'code' in error) {
+            // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
+            const fsError = error as { code: string; message: string };
+            logger.warn(
+              `Error checking for ${marker} at ${markerPath}: ${fsError.message}`,
+            );
+          } else {
+            logger.warn(
+              `Non-standard error checking for ${marker} at ${markerPath}: ${String(error)}`,
+            );
+          }
         }
       }
     }
@@ -200,6 +213,7 @@ async function getGeminiMdFilePathsInternal(
   folderTrust: boolean,
   fileFilteringOptions: FileFilteringOptions,
   maxDirs: number,
+  boundaryMarkers: readonly string[] = ['.git'],
 ): Promise<{ global: string[]; project: string[] }> {
   const dirs = new Set<string>([
     ...includeDirectoriesToReadGemini,
@@ -222,6 +236,7 @@ async function getGeminiMdFilePathsInternal(
         folderTrust,
         fileFilteringOptions,
         maxDirs,
+        boundaryMarkers,
       ),
     );
 
@@ -253,6 +268,7 @@ async function getGeminiMdFilePathsInternalForEachDir(
   folderTrust: boolean,
   fileFilteringOptions: FileFilteringOptions,
   maxDirs: number,
+  boundaryMarkers: readonly string[] = ['.git'],
 ): Promise<{ global: string[]; project: string[] }> {
   const globalPaths = new Set<string>();
   const projectPaths = new Set<string>();
@@ -289,7 +305,7 @@ async function getGeminiMdFilePathsInternalForEachDir(
         resolvedCwd,
       );
 
-      const projectRoot = await findProjectRoot(resolvedCwd);
+      const projectRoot = await findProjectRoot(resolvedCwd, boundaryMarkers);
       debugLogger.debug(
         '[DEBUG] [MemoryDiscovery] Determined project root:',
         projectRoot ?? 'None',
@@ -356,6 +372,7 @@ async function getGeminiMdFilePathsInternalForEachDir(
 export async function readGeminiMdFiles(
   filePaths: string[],
   importFormat: 'flat' | 'tree' = 'tree',
+  boundaryMarkers: readonly string[] = ['.git'],
 ): Promise<GeminiFileContent[]> {
   // Process files in parallel with concurrency limit to prevent EMFILE errors
   const CONCURRENT_LIMIT = 20; // Higher limit for file reads as they're typically faster
@@ -376,6 +393,7 @@ export async function readGeminiMdFiles(
             undefined,
             undefined,
             importFormat,
+            boundaryMarkers,
           );
           debugLogger.debug(
             '[DEBUG] [MemoryDiscovery] Successfully read and processed imports:',
@@ -481,13 +499,14 @@ export function getExtensionMemoryPaths(
 
 export async function getEnvironmentMemoryPaths(
   trustedRoots: string[],
+  boundaryMarkers: readonly string[] = ['.git'],
 ): Promise<string[]> {
   const allPaths = new Set<string>();
 
   // Trusted Roots Upward Traversal (Parallelized)
   const traversalPromises = trustedRoots.map(async (root) => {
     const resolvedRoot = normalizePath(root);
-    const gitRoot = await findProjectRoot(resolvedRoot);
+    const gitRoot = await findProjectRoot(resolvedRoot, boundaryMarkers);
     const ceiling = gitRoot ? normalizePath(gitRoot) : resolvedRoot;
     debugLogger.debug(
       '[DEBUG] [MemoryDiscovery] Loading environment memory for trusted root:',
@@ -597,6 +616,7 @@ export async function loadServerHierarchicalMemory(
   importFormat: 'flat' | 'tree' = 'tree',
   fileFilteringOptions?: FileFilteringOptions,
   maxDirs: number = 200,
+  boundaryMarkers: readonly string[] = ['.git'],
 ): Promise<LoadServerHierarchicalMemoryResponse> {
   // FIX: Use real, canonical paths for a reliable comparison to handle symlinks.
   const realCwd = normalizePath(
@@ -629,6 +649,7 @@ export async function loadServerHierarchicalMemory(
       folderTrust,
       fileFilteringOptions || DEFAULT_MEMORY_FILE_FILTERING_OPTIONS,
       maxDirs,
+      boundaryMarkers,
     ),
     Promise.resolve(getExtensionMemoryPaths(extensionLoader)),
   ]);
@@ -669,7 +690,11 @@ export async function loadServerHierarchicalMemory(
   }
 
   // 2. GATHER: Read all files in parallel
-  const allContents = await readGeminiMdFiles(allFilePaths, importFormat);
+  const allContents = await readGeminiMdFiles(
+    allFilePaths,
+    importFormat,
+    boundaryMarkers,
+  );
   const contentsMap = new Map(allContents.map((c) => [c.filePath, c]));
 
   // 3. CATEGORIZE: Back into Global, Project, Extension
@@ -707,6 +732,7 @@ export async function refreshServerHierarchicalMemory(config: Config) {
     config.getImportFormat(),
     config.getFileFilteringOptions(),
     config.getDiscoveryMaxDirs(),
+    config.getMemoryBoundaryMarkers(),
   );
   const mcpInstructions =
     config.getMcpClientManager()?.getMcpInstructions() || '';
@@ -728,6 +754,7 @@ export async function loadJitSubdirectoryMemory(
   trustedRoots: string[],
   alreadyLoadedPaths: Set<string>,
   alreadyLoadedIdentities?: Set<string>,
+  boundaryMarkers: readonly string[] = ['.git'],
 ): Promise<MemoryLoadResult> {
   const resolvedTarget = normalizePath(targetPath);
   let bestRoot: string | null = null;
@@ -760,7 +787,7 @@ export async function loadJitSubdirectoryMemory(
 
   // Find the git root to use as the traversal ceiling.
   // If no git root exists, fall back to the trusted root as the ceiling.
-  const gitRoot = await findProjectRoot(bestRoot);
+  const gitRoot = await findProjectRoot(bestRoot, boundaryMarkers);
   const resolvedCeiling = gitRoot ? normalizePath(gitRoot) : bestRoot;
 
   debugLogger.debug(
@@ -850,7 +877,7 @@ export async function loadJitSubdirectoryMemory(
     JSON.stringify(newPaths),
   );
 
-  const contents = await readGeminiMdFiles(newPaths, 'tree');
+  const contents = await readGeminiMdFiles(newPaths, 'tree', boundaryMarkers);
 
   return {
     files: contents

packages/core/src/utils/memoryImportProcessor.ts

@@ -48,18 +48,31 @@ export interface ProcessImportsResult {
   importTree: MemoryFile;
 }
 
-// Helper to find the project root (looks for .git directory or file for worktrees)
-async function findProjectRoot(startDir: string): Promise<string> {
+// Helper to find the project root (looks for boundary marker directories/files)
+async function findProjectRoot(
+  startDir: string,
+  boundaryMarkers: readonly string[] = ['.git'],
+): Promise<string> {
+  if (boundaryMarkers.length === 0) {
+    return path.resolve(startDir);
+  }
+
   let currentDir = path.resolve(startDir);
   while (true) {
-    const gitPath = path.join(currentDir, '.git');
-    try {
-      // Check for existence only — .git can be a directory (normal repos)
-      // or a file (submodules / worktrees).
-      await fs.access(gitPath);
-      return currentDir;
-    } catch {
-      // .git not found, continue to parent
+    for (const marker of boundaryMarkers) {
+      // Sanitize: skip markers with path traversal or absolute paths
+      if (path.isAbsolute(marker) || marker.includes('..')) {
+        continue;
+      }
+      const markerPath = path.join(currentDir, marker);
+      try {
+        // Check for existence only — marker can be a directory (normal repos)
+        // or a file (submodules / worktrees).
+        await fs.access(markerPath);
+        return currentDir;
+      } catch {
+        // marker not found, continue
+      }
     }
     const parentDir = path.dirname(currentDir);
     if (parentDir === currentDir) {
@@ -68,7 +81,7 @@ async function findProjectRoot(startDir: string): Promise<string> {
     }
     currentDir = parentDir;
   }
-  // Fallback to startDir if .git not found
+  // Fallback to startDir if no marker found
   return path.resolve(startDir);
 }
 
@@ -185,9 +198,10 @@ export async function processImports(
   },
   projectRoot?: string,
   importFormat: 'flat' | 'tree' = 'tree',
+  boundaryMarkers: readonly string[] = ['.git'],
 ): Promise<ProcessImportsResult> {
   if (!projectRoot) {
-    projectRoot = await findProjectRoot(basePath);
+    projectRoot = await findProjectRoot(basePath, boundaryMarkers);
   }
 
   if (importState.currentDepth >= importState.maxDepth) {
@@ -346,6 +360,7 @@ export async function processImports(
         newImportState,
         projectRoot,
         importFormat,
+        boundaryMarkers,
       );
       result += `<!-- Imported from: ${importPath} -->\n${imported.content}\n<!-- End of import from: ${importPath} -->`;
       imports.push(imported.importTree);

schemas/settings.schema.json

@@ -2272,6 +2272,16 @@
           "default": 200,
           "type": "number"
         },
+        "memoryBoundaryMarkers": {
+          "title": "Memory Boundary Markers",
+          "description": "File or directory names that mark the boundary for GEMINI.md discovery. The upward traversal stops at the first directory containing any of these markers. An empty array disables parent traversal.",
+          "markdownDescription": "File or directory names that mark the boundary for GEMINI.md discovery. The upward traversal stops at the first directory containing any of these markers. An empty array disables parent traversal.\n\n- Category: `Context`\n- Requires restart: `yes`\n- Default: `[\n  \".git\"\n]`",
+          "default": [".git"],
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
         "includeDirectories": {
           "title": "Include Directories",
           "description": "Additional directories to include in the workspace context. Missing directories will be skipped with a warning.",