diff --git a/build.js b/build.js
index d95dc1d..db213d1 100644
--- a/build.js
+++ b/build.js
@@ -2,6 +2,8 @@ const esbuild = require("esbuild");
 const sveltePlugin = require("esbuild-svelte");
 const path = require("path");
 
+const { version: ignisVersion } = require("./package.json");
+
 Promise.all([
   // Build shim-loader.js
   esbuild.build({
@@ -14,6 +16,9 @@ Promise.all([
     alias: {
       path: "path-browserify",
     },
+    define: {
+      __IGNIS_VERSION__: JSON.stringify(ignisVersion),
+    },
     logLevel: "info",
   }),
 
diff --git a/plugin/src/main.js b/plugin/src/main.js
index 40c75da..8d46554 100644
--- a/plugin/src/main.js
+++ b/plugin/src/main.js
@@ -1,6 +1,13 @@
 const { Plugin, TFile, TFolder } = require("obsidian");
-const { showFilePicker, addFileMenuItems, addFolderMenuItems } = require("./file-actions");
-const { patchSettingsModal, unpatchSettingsModal } = require("./settings/inject");
+const {
+  showFilePicker,
+  addFileMenuItems,
+  addFolderMenuItems,
+} = require("./file-actions");
+const {
+  patchSettingsModal,
+  unpatchSettingsModal,
+} = require("./settings/inject");
 const pluginRegistry = require("./plugin-registry");
 const { initStatusBar } = require("./status-bar");
 const { WorkspacePickerModal } = require("./workspace-picker");
@@ -10,6 +17,11 @@ window.__obsidianAPI = require("obsidian");
 
 class IgnisBridgePlugin extends Plugin {
   async onload() {
+    if (!window.__ignis) {
+      console.log("[ignis-bridge] Not running in Ignis - plugin is a no-op.");
+      return;
+    }
+
     console.log("[ignis-bridge] Plugin loaded");
 
     await pluginRegistry.refresh();
@@ -41,6 +53,10 @@ class IgnisBridgePlugin extends Plugin {
   }
 
   onunload() {
+    if (!window.__ignis) {
+      return;
+    }
+
     if (this._statusBarInterval) {
       clearInterval(this._statusBarInterval);
     }
diff --git a/server/plugins/headless-sync/plugin/src/main.js b/server/plugins/headless-sync/plugin/src/main.js
index 04adce0..1f47399 100644
--- a/server/plugins/headless-sync/plugin/src/main.js
+++ b/server/plugins/headless-sync/plugin/src/main.js
@@ -7,6 +7,13 @@ const api = require("./api");
 
 class IgnisHeadlessSyncPlugin extends Plugin {
   async onload() {
+    if (!window.__ignis) {
+      console.log(
+        "[ignis-headless-sync] Not running in Ignis - plugin is a no-op.",
+      );
+      return;
+    }
+
     this.wsListener = new WsListener();
     this.wsListener.start();
 
@@ -53,6 +60,10 @@ class IgnisHeadlessSyncPlugin extends Plugin {
   }
 
   onunload() {
+    if (!window.__ignis) {
+      return;
+    }
+
     window.__ignisHeadlessSyncActive = false;
 
     if (this._coreSyncGuard) {
diff --git a/src/shims/loader.js b/src/shims/loader.js
index 7be6389..99fd41b 100644
--- a/src/shims/loader.js
+++ b/src/shims/loader.js
@@ -4,6 +4,9 @@ import { installCssOverrides } from "./css-overrides.js";
 import { initialize } from "./init.js";
 import { fsShim } from "./fs/index.js";
 
+// __IGNIS_VERSION__ is replaced at build time from package.json.
+window.__ignis = { version: __IGNIS_VERSION__ };
+
 installGlobals(); // process, Buffer, window overrides (before require so Buffer is available)
 installRequire(); // shim registry, window.require
 installCssOverrides(); // browser-specific CSS fixes