diff --git a/src/extension/src/command-executor.ts b/src/extension/src/command-executor.ts
index 1a3ffdc2..9ea7507a 100644
--- a/src/extension/src/command-executor.ts
+++ b/src/extension/src/command-executor.ts
@@ -1,4 +1,5 @@
 import * as vscode from "vscode";
+import { MESSAGES } from "../../shared/constants";
 import { TerminalExecutor, QuickPickCreator } from "./adapters";
 import { findMatchingShortcut } from "./keyboard-layout-converter";
 import { ButtonConfig } from "./types";
@@ -85,11 +86,7 @@ export const createQuickPickWithShortcuts = (
   const duplicates = validateShortcuts(config.items);
 
   if (duplicates.length > 0) {
-    vscode.window.showErrorMessage(
-      `Duplicate shortcuts detected: ${duplicates.join(
-        ", "
-      )}. Please ensure each shortcut is unique.`
-    );
+    vscode.window.showErrorMessage(MESSAGES.ERROR.duplicateShortcuts(duplicates));
     return;
   }
 
@@ -183,8 +180,8 @@ const showGroupQuickPick = (
   createQuickPickWithShortcuts(
     {
       items: items,
-      placeholder: "Select a command to execute",
-      title: `${button.name} Commands`,
+      placeholder: MESSAGES.INFO.selectCommand,
+      title: MESSAGES.INFO.groupCommands(button.name),
     },
     terminalExecutor,
     quickPickCreator
diff --git a/src/extension/src/config-constants.ts b/src/extension/src/config-constants.ts
index c4f4a5cc..e8024074 100644
--- a/src/extension/src/config-constants.ts
+++ b/src/extension/src/config-constants.ts
@@ -1,17 +1,9 @@
 import * as vscode from "vscode";
+import { CONFIG, CONFIGURATION_TARGET } from "../../shared/constants";
 
-export const CONFIG_SECTION = "quickCommandButtons";
-
-export const CONFIG_KEYS = {
-  BUTTONS: "buttons",
-  CONFIGURATION_TARGET: "configurationTarget",
-  REFRESH_BUTTON: "refreshButton",
-} as const;
-
-export const CONFIGURATION_TARGETS = {
-  GLOBAL: "global",
-  WORKSPACE: "workspace",
-} as const;
+export const CONFIG_SECTION = CONFIG.SECTION;
+export const CONFIG_KEYS = CONFIG.KEYS;
+export const CONFIGURATION_TARGETS = CONFIGURATION_TARGET;
 
 export const VS_CODE_CONFIGURATION_TARGETS = {
   [CONFIGURATION_TARGETS.GLOBAL]: vscode.ConfigurationTarget.Global,
@@ -19,5 +11,5 @@ export const VS_CODE_CONFIGURATION_TARGETS = {
 } as const;
 
 export type ConfigurationTargetType =
-  (typeof CONFIGURATION_TARGETS)[keyof typeof CONFIGURATION_TARGETS];
-export type ConfigKeyType = (typeof CONFIG_KEYS)[keyof typeof CONFIG_KEYS];
+  (typeof CONFIGURATION_TARGET)[keyof typeof CONFIGURATION_TARGET];
+export type ConfigKeyType = (typeof CONFIG.KEYS)[keyof typeof CONFIG.KEYS];
diff --git a/src/extension/src/show-all-commands.ts b/src/extension/src/show-all-commands.ts
index 3734614d..eee0ac21 100644
--- a/src/extension/src/show-all-commands.ts
+++ b/src/extension/src/show-all-commands.ts
@@ -1,4 +1,5 @@
 import * as vscode from "vscode";
+import { MESSAGES } from "../../shared/constants";
 import { ConfigReader, QuickPickCreator, TerminalExecutor } from "./adapters";
 import { createQuickPickWithShortcuts, QuickPickItem } from "./command-executor";
 import { ButtonConfig } from "./types";
@@ -6,7 +7,9 @@ import { ButtonConfig } from "./types";
 export const createQuickPickItemsFromButtons = (buttons: ButtonConfig[]): QuickPickItem[] => {
   return buttons.map((button) => ({
     command: button,
-    description: button.group ? `${button.group.length} commands` : button.command || "",
+    description: button.group
+      ? MESSAGES.INFO.commandsCount(button.group.length)
+      : button.command || "",
     label: button.shortcut ? `${button.name} (${button.shortcut})` : button.name,
   }));
 };
@@ -20,7 +23,7 @@ export const createShowAllCommandsCommand = (
     const buttons = configReader.getButtons();
 
     if (buttons.length === 0) {
-      vscode.window.showInformationMessage("No commands found");
+      vscode.window.showInformationMessage(MESSAGES.ERROR.noCommands);
       return;
     }
 
@@ -29,8 +32,8 @@ export const createShowAllCommandsCommand = (
     createQuickPickWithShortcuts(
       {
         items: items,
-        placeholder: "Select a command/group to execute (or type shortcut key)",
-        title: "Quick Commands",
+        placeholder: MESSAGES.INFO.selectCommandOrGroup,
+        title: MESSAGES.INFO.quickCommands,
       },
       terminalExecutor,
       quickPickCreator
diff --git a/src/shared/constants.ts b/src/shared/constants.ts
new file mode 100644
index 00000000..88db34e5
--- /dev/null
+++ b/src/shared/constants.ts
@@ -0,0 +1,38 @@
+export const CONFIG = {
+  SECTION: "quickCommandButtons",
+  KEYS: {
+    BUTTONS: "buttons",
+    CONFIGURATION_TARGET: "configurationTarget",
+    REFRESH_BUTTON: "refreshButton",
+  },
+} as const;
+
+export const CONFIGURATION_TARGET = {
+  GLOBAL: "global",
+  WORKSPACE: "workspace",
+} as const;
+
+export const MESSAGE_TYPE = {
+  GET_CONFIG: "getConfig",
+  SET_CONFIG: "setConfig",
+  SET_CONFIGURATION_TARGET: "setConfigurationTarget",
+  CONFIG_DATA: "configData",
+  CONFIGURATION_TARGET_CHANGED: "configurationTargetChanged",
+} as const;
+
+export const MESSAGES = {
+  ERROR: {
+    contextRequired: (hookName: string) =>
+      `${hookName} must be used within a VscodeCommandProvider`,
+    duplicateShortcuts: (shortcuts: string[]) =>
+      `Duplicate shortcuts detected: ${shortcuts.join(", ")}. Please ensure each shortcut is unique.`,
+    noCommands: "No commands found",
+  },
+  INFO: {
+    selectCommand: "Select a command to execute",
+    selectCommandOrGroup: "Select a command/group to execute (or type shortcut key)",
+    quickCommands: "Quick Commands",
+    groupCommands: (buttonName: string) => `${buttonName} Commands`,
+    commandsCount: (count: number) => `${count} commands`,
+  },
+} as const;
diff --git a/src/web-view/src/components/header.tsx b/src/web-view/src/components/header.tsx
index 60aa7186..d8852e46 100644
--- a/src/web-view/src/components/header.tsx
+++ b/src/web-view/src/components/header.tsx
@@ -1,5 +1,6 @@
 import { Button } from "~/core";
 
+import { CONFIGURATION_TARGET } from "../../../shared/constants";
 import { useCommandForm } from "../context/command-form-context.tsx";
 import { useVscodeCommand } from "../context/vscode-command-context.tsx";
 import { useDarkMode } from "../hooks/use-dark-mode.tsx";
@@ -10,7 +11,10 @@ export const Header = () => {
   const { isDark, toggleTheme } = useDarkMode();
 
   const toggleConfigurationTarget = () => {
-    const newTarget = configurationTarget === "workspace" ? "global" : "workspace";
+    const newTarget =
+      configurationTarget === CONFIGURATION_TARGET.WORKSPACE
+        ? CONFIGURATION_TARGET.GLOBAL
+        : CONFIGURATION_TARGET.WORKSPACE;
     setConfigurationTarget(newTarget);
   };
 
@@ -36,12 +40,12 @@ export const Header = () => {
         <div className="flex flex-col">
           <span className="text-sm font-medium text-foreground">Configuration Scope</span>
           <span className="text-xs text-muted-foreground">
-            {configurationTarget === "workspace"
+            {configurationTarget === CONFIGURATION_TARGET.WORKSPACE
               ? "📁 Workspace: Project-specific commands shared with team"
               : "🌐 Global: Personal commands across all projects"}
           </span>
           <div className="text-xs text-muted-foreground/70 mt-1">
-            {configurationTarget === "workspace"
+            {configurationTarget === CONFIGURATION_TARGET.WORKSPACE
               ? "Saved to .vscode/settings.json • Best for team collaboration"
               : "Saved to user settings • Best for personal workflow"}
           </div>
@@ -50,13 +54,13 @@ export const Header = () => {
           className="border-border hover:bg-accent"
           onClick={toggleConfigurationTarget}
           title={
-            configurationTarget === "workspace"
+            configurationTarget === CONFIGURATION_TARGET.WORKSPACE
               ? "Switch to Global settings (personal commands)"
               : "Switch to Workspace settings (team commands)"
           }
           variant="outline"
         >
-          {configurationTarget === "workspace" ? "📁 Workspace" : "🌐 Global"}
+          {configurationTarget === CONFIGURATION_TARGET.WORKSPACE ? "📁 Workspace" : "🌐 Global"}
         </Button>
       </div>
     </div>
diff --git a/src/web-view/src/context/vscode-command-context.tsx b/src/web-view/src/context/vscode-command-context.tsx
index ee69708f..a6af854a 100644
--- a/src/web-view/src/context/vscode-command-context.tsx
+++ b/src/web-view/src/context/vscode-command-context.tsx
@@ -1,5 +1,6 @@
 import { createContext, useContext, useEffect, useState, type ReactNode } from "react";
 
+import { MESSAGE_TYPE, MESSAGES, CONFIGURATION_TARGET } from "../../../shared/constants";
 import { vscodeApi, isDevelopment } from "../core/vscode-api.tsx";
 import { mockCommands } from "../mock/mock-data.tsx";
 import { type ButtonConfig } from "../types";
@@ -20,7 +21,7 @@ const VscodeCommandContext = createContext<VscodeCommandContextType | undefined>
 export const useVscodeCommand = () => {
   const context = useContext(VscodeCommandContext);
   if (context === undefined) {
-    throw new Error("useVscodeCommand must be used within a VscodeCommandProvider");
+    throw new Error(MESSAGES.ERROR.contextRequired("useVscodeCommand"));
   }
   return context;
 };
@@ -31,7 +32,9 @@ type VscodeCommandProviderProps = {
 
 export const VscodeCommandProvider = ({ children }: VscodeCommandProviderProps) => {
   const [commands, setCommands] = useState<ButtonConfig[]>([]);
-  const [configurationTarget, setConfigurationTargetState] = useState<string>("workspace");
+  const [configurationTarget, setConfigurationTargetState] = useState<string>(
+    CONFIGURATION_TARGET.WORKSPACE
+  );
 
   useEffect(() => {
     if (isDevelopment) {
@@ -40,18 +43,18 @@ export const VscodeCommandProvider = ({ children }: VscodeCommandProviderProps)
     }
 
     const requestConfig = () => {
-      vscodeApi.postMessage({ type: "getConfig" });
+      vscodeApi.postMessage({ type: MESSAGE_TYPE.GET_CONFIG });
     };
 
     const handleMessage = (event: MessageEvent) => {
       const message = event.data;
-      if (message?.type === "configData") {
+      if (message?.type === MESSAGE_TYPE.CONFIG_DATA) {
         if (message.data && typeof message.data === "object" && message.data.buttons) {
-          // New format with configurationTarget
           setCommands(message.data.buttons || []);
-          setConfigurationTargetState(message.data.configurationTarget || "workspace");
+          setConfigurationTargetState(
+            message.data.configurationTarget || CONFIGURATION_TARGET.WORKSPACE
+          );
         } else {
-          // Old format (backward compatibility)
           setCommands(message.data || []);
         }
       }
@@ -68,7 +71,7 @@ export const VscodeCommandProvider = ({ children }: VscodeCommandProviderProps)
       vscodeApi.setCurrentData(commands);
       return;
     }
-    vscodeApi.postMessage({ data: commands, type: "setConfig" });
+    vscodeApi.postMessage({ data: commands, type: MESSAGE_TYPE.SET_CONFIG });
   };
 
   const addCommand = (command: ButtonConfig) => {
@@ -94,7 +97,7 @@ export const VscodeCommandProvider = ({ children }: VscodeCommandProviderProps)
   const setConfigurationTarget = (target: string) => {
     setConfigurationTargetState(target);
     if (!isDevelopment) {
-      vscodeApi.postMessage({ target, type: "setConfigurationTarget" });
+      vscodeApi.postMessage({ target, type: MESSAGE_TYPE.SET_CONFIGURATION_TARGET });
     }
   };