diff --git a/.vscode/launch.json b/.vscode/launch.json
index 03bd5e6b..7dfb1b60 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -51,7 +51,7 @@
             "preLaunchTask": "npm: build:extension:dev",
             "args": [
                 "--extensionDevelopmentPath=${workspaceFolder}/packages/vscode-Vipeye",
-                "--extensionDevelopmentPath=${workspaceFolder}/packages/viper",
+                //"--extensionDevelopmentPath=${workspaceFolder}/packages/viper",
                 // The published extension is named "ms-Vipeye.Vipeye", but in debug mode it's "ms-Vipeye.vscode-Vipeye"
                 // to allow the extension code to participate in the lerna monorepo. Make sure that the published extension
                 // isn't enabled, otherwise both are loaded and conflict.
@@ -71,7 +71,7 @@
             "preLaunchTask": "Watch extension",
             "args": [
                 "--extensionDevelopmentPath=${workspaceFolder}/packages/vscode-Vipeye",
-                "--extensionDevelopmentPath=${workspaceFolder}/packages/viper",
+                // "--extensionDevelopmentPath=${workspaceFolder}/packages/viper",
                 // The published extension is named "ms-Vipeye.Vipeye", but in debug mode it's "ms-Vipeye.vscode-Vipeye"
                 // to allow the extension code to participate in the lerna monorepo. Make sure that the published extension
                 // isn't enabled, otherwise both are loaded and conflict.
diff --git a/packages/viper/src/extension.ts b/packages/viper/src/extension.ts
index 469eeb77..eeb7afce 100644
--- a/packages/viper/src/extension.ts
+++ b/packages/viper/src/extension.ts
@@ -52,28 +52,28 @@ export async function activate(context: ExtensionContext): Promise<ViperApiImpl>
 
     // 命令。
     context.subscriptions.push(
-        commands.registerCommand('viper.createProject', async () => {
+        RegisterCommandSafe(context, 'viper.createProject', async () => {
             await CreateProjectCommand();
             await projects.DiscoverProjects();
             projectView.Refresh();
         }),
-        commands.registerCommand('viper.selectToolchain', async () => {
+        RegisterCommandSafe(context, 'viper.selectToolchain', async () => {
             await toolchain.SelectToolchain();
         }),
-        commands.registerCommand('viper.showProjectInfo', () => {
+        RegisterCommandSafe(context, 'viper.showProjectInfo', () => {
             ShowProjectInfoCommand(projects);
         }),
-        commands.registerCommand('viper.openSettings', () => {
+        RegisterCommandSafe(context, 'viper.openSettings', () => {
             commands.executeCommand('workbench.action.openSettings', '@ext:TermiNexus.vipeye');
         }),
-        commands.registerCommand('viper.refreshView', async () => {
+        RegisterCommandSafe(context, 'viper.refreshView', async () => {
             await projects.DiscoverProjects();
             toolchain.Refresh();
             projectView.Refresh();
             toolchainView.Refresh();
             settingsView.Refresh();
         }),
-        commands.registerCommand('viper.openVpjAsJson', async (uri?: import('vscode').Uri) => {
+        RegisterCommandSafe(context, 'viper.openVpjAsJson', async (uri?: import('vscode').Uri) => {
             const target = uri ?? window.activeTextEditor?.document.uri;
             if (!target) {
                 window.showWarningMessage('No .vpj file selected.');
@@ -102,6 +102,22 @@ export function deactivate(): void {
     // 清理由 context.subscriptions 自动处理。
 }
 
+/** 安全注册命令：vscode-vipeye 单一合并了核心代码，若与独立的 viper 核心扩展
+ *  同时激活，命令可能已被先注册的扩展注册（command 'xxx' already exists）。
+ *  此处捕获重复注册错误并跳过，避免整个扩展激活失败；命令由先注册方提供。 */
+function RegisterCommandSafe(
+    context: ExtensionContext,
+    commandId: string,
+    handler: (...args: any[]) => any
+): import('vscode').Disposable {
+    try {
+        return commands.registerCommand(commandId, handler);
+    } catch (e) {
+        console.warn(`[viper] command '${commandId}' already registered by another extension, skipping.`);
+        return { dispose() {} };
+    }
+}
+
 /** 创建项目命令：在当前 workspace 根目录生成 .vpj 模板。 */
 async function CreateProjectCommand(): Promise<void> {
     if (!workspace.workspaceFolders || workspace.workspaceFolders.length === 0) {
diff --git a/packages/viper/src/vpjEditorProvider.ts b/packages/viper/src/vpjEditorProvider.ts
index 53227e82..89abe090 100644
--- a/packages/viper/src/vpjEditorProvider.ts
+++ b/packages/viper/src/vpjEditorProvider.ts
@@ -18,10 +18,18 @@ export class VpjEditorProvider implements vscode.CustomTextEditorProvider {
 
     public static Register(context: vscode.ExtensionContext): vscode.Disposable {
         const provider = new VpjEditorProvider(context);
-        return vscode.window.registerCustomEditorProvider(VpjEditorProvider.ViewType, provider, {
-            webviewOptions: { retainContextWhenHidden: true },
-            supportsMultipleEditorsPerDocument: false,
-        });
+        try {
+            return vscode.window.registerCustomEditorProvider(VpjEditorProvider.ViewType, provider, {
+                webviewOptions: { retainContextWhenHidden: true },
+                supportsMultipleEditorsPerDocument: false,
+            });
+        } catch (e) {
+            // viper 核心扩展与合并了核心代码的 vscode-vipeye 同时激活时，
+            // 后激活者会因 viewType 已注册而抛错，导致整个扩展激活失败。
+            // 此处跳过重复注册，编辑器由先注册的扩展提供，功能等价。
+            console.warn(`[viper] ${VpjEditorProvider.ViewType} already registered by another extension, skipping.`);
+            return { dispose() {} };
+        }
     }
 
     constructor(private readonly context: vscode.ExtensionContext) {}
diff --git a/packages/vipeye-internal/src/analyzer/importResolver.ts b/packages/vipeye-internal/src/analyzer/importResolver.ts
index 00244401..d801f83a 100644
--- a/packages/vipeye-internal/src/analyzer/importResolver.ts
+++ b/packages/vipeye-internal/src/analyzer/importResolver.ts
@@ -559,6 +559,8 @@ export class ImportResolver {
         // and so on, until the import root is reached.
         const origin = sourceFileUri.getDirectory();
 
+        const importLogger = this._configOptions.verboseOutput ? new ImportLogger() : undefined;
+
         const result = this.cachedParentImportResults.getImportResult(origin, importName, importResult);
         if (result) {
             // Already ran the parent directory resolution for this import name on this location.
@@ -568,11 +570,31 @@ export class ImportResolver {
         // Check whether the given file is in the parent directory import resolution cache.
         const root = getParentImportResolutionRoot(sourceFileUri, execEnv.root);
         if (!this.cachedParentImportResults.checkValidPath(this.fileSystem, sourceFileUri, root)) {
+            // Viper 扩展：源文件不在执行根下（例如 LSP 工作区根被 .vpj 子项目收窄，
+            // main.py 位于子项目目录之外）时，Pyright 原逻辑直接放弃父目录回退。
+            // 这里仍从源文件自身目录解析一次绝对导入（Python 语义：脚本所在目录
+            // 在 sys.path 上），支持 main.py + 同目录包（如 App/lib）的导入。
+            // 不做向上遍历，避免误解析到执行根外的父目录包。
+            if (IsViperDialect(this._configOptions.dialect)) {
+                const originResult = this.resolveAbsoluteImport(
+                    sourceFileUri,
+                    origin,
+                    execEnv,
+                    moduleDescriptor,
+                    importName,
+                    importLogger,
+                    /* allowPartial */ undefined,
+                    /* allowNativeLib */ undefined,
+                    /* useStubPackage */ false,
+                    /* allowPyi */ true
+                );
+                if (originResult?.isImportFound) {
+                    return this.filterImplicitImports(originResult, moduleDescriptor.importedSymbols);
+                }
+            }
             return importResult;
         }
 
-        const importLogger = this._configOptions.verboseOutput ? new ImportLogger() : undefined;
-
         const importPath: ImportPath = { importPath: undefined };
 
         // Going up the given folder one by one until we can resolve the import.