feat: Multi-Directory Workspace Support (part1: add --include-directories option) (#4605)

Co-authored-by: Allen Hutchison <adh@google.com>

packages/core/src/config/config.ts

@@ -50,6 +50,7 @@ import { IdeClient } from '../ide/ide-client.js';
 
 // Re-export OAuth config type
 export type { MCPOAuthConfig };
+import { WorkspaceContext } from '../utils/workspaceContext.js';
 
 export enum ApprovalMode {
   DEFAULT = 'default',
@@ -172,6 +173,7 @@ export interface ConfigParameters {
   proxy?: string;
   cwd: string;
   fileDiscoveryService?: FileDiscoveryService;
+  includeDirectories?: string[];
   bugCommand?: BugCommandSettings;
   model: string;
   extensionContextFilePaths?: string[];
@@ -194,6 +196,7 @@ export class Config {
   private readonly embeddingModel: string;
   private readonly sandbox: SandboxConfig | undefined;
   private readonly targetDir: string;
+  private readonly workspaceContext: WorkspaceContext;
   private readonly debugMode: boolean;
   private readonly question: string | undefined;
   private readonly fullContext: boolean;
@@ -248,6 +251,10 @@ export class Config {
       params.embeddingModel ?? DEFAULT_GEMINI_EMBEDDING_MODEL;
     this.sandbox = params.sandbox;
     this.targetDir = path.resolve(params.targetDir);
+    this.workspaceContext = new WorkspaceContext(
+      this.targetDir,
+      params.includeDirectories ?? [],
+    );
     this.debugMode = params.debugMode;
     this.question = params.question;
     this.fullContext = params.fullContext ?? false;
@@ -392,6 +399,10 @@ export class Config {
     return this.targetDir;
   }
 
+  getWorkspaceContext(): WorkspaceContext {
+    return this.workspaceContext;
+  }
+
   getToolRegistry(): Promise<ToolRegistry> {
     return Promise.resolve(this.toolRegistry);
   }