diff --git a/packages/svelte/src/sdk.ts b/packages/svelte/src/sdk.ts
index 448ccacbf046..3a7c671a7d1d 100644
--- a/packages/svelte/src/sdk.ts
+++ b/packages/svelte/src/sdk.ts
@@ -7,7 +7,7 @@ import { getDomElement } from '@sentry/utils';
  */
 export function init(options: BrowserOptions): void {
   options._metadata = options._metadata || {};
-  options._metadata.sdk = {
+  options._metadata.sdk = options._metadata.sdk || {
     name: 'sentry.javascript.svelte',
     packages: [
       {
diff --git a/packages/svelte/test/sdk.test.ts b/packages/svelte/test/sdk.test.ts
index 8203b025a437..ea3e3e383eba 100644
--- a/packages/svelte/test/sdk.test.ts
+++ b/packages/svelte/test/sdk.test.ts
@@ -1,23 +1,21 @@
-import { addGlobalEventProcessor, init as browserInit, SDK_VERSION } from '@sentry/browser';
+import { SDK_VERSION } from '@sentry/browser';
+import * as SentryBrowser from '@sentry/browser';
 import type { EventProcessor } from '@sentry/types';
 
 import { detectAndReportSvelteKit, init as svelteInit, isSvelteKitApp } from '../src/sdk';
 
 let passedEventProcessor: EventProcessor | undefined;
 
-jest.mock('@sentry/browser', () => {
-  const actual = jest.requireActual('@sentry/browser');
-  return {
-    ...actual,
-    init: jest.fn().mockImplementation(actual.init),
-    addGlobalEventProcessor: jest.fn().mockImplementation(proc => {
-      passedEventProcessor = proc;
-    }),
-  };
-});
+const browserInit = jest.spyOn(SentryBrowser, 'init');
+const addGlobalEventProcessor = jest
+  .spyOn(SentryBrowser, 'addGlobalEventProcessor')
+  .mockImplementation((eventProcessor: EventProcessor) => {
+    passedEventProcessor = eventProcessor;
+    return () => {};
+  });
 
 describe('Initialize Svelte SDk', () => {
-  afterAll(() => {
+  beforeEach(() => {
     jest.clearAllMocks();
   });
 
@@ -37,13 +35,45 @@ describe('Initialize Svelte SDk', () => {
     };
 
     expect(browserInit).toHaveBeenCalledTimes(1);
-    expect(browserInit).toHaveBeenCalledWith(expect.objectContaining(expectedMetadata));
+    expect(browserInit).toHaveBeenLastCalledWith(expect.objectContaining(expectedMetadata));
+  });
+
+  it("doesn't add the default svelte metadata, if metadata is already passed", () => {
+    svelteInit({
+      dsn: 'https://public@dsn.ingest.sentry.io/1337',
+      _metadata: {
+        sdk: {
+          name: 'sentry.javascript.sveltekit',
+          version: SDK_VERSION,
+          packages: [
+            { name: 'npm:@sentry/sveltekit', version: SDK_VERSION },
+            { name: 'npm:@sentry/svelte', version: SDK_VERSION },
+          ],
+        },
+      },
+    });
+
+    expect(browserInit).toHaveBeenCalledTimes(1);
+    expect(browserInit).toHaveBeenLastCalledWith(
+      expect.objectContaining({
+        _metadata: {
+          sdk: {
+            name: 'sentry.javascript.sveltekit',
+            version: SDK_VERSION,
+            packages: [
+              { name: 'npm:@sentry/sveltekit', version: SDK_VERSION },
+              { name: 'npm:@sentry/svelte', version: SDK_VERSION },
+            ],
+          },
+        },
+      }),
+    );
   });
 });
 
 describe('detectAndReportSvelteKit()', () => {
   const originalHtmlBody = document.body.innerHTML;
-  afterEach(() => {
+  beforeEach(() => {
     jest.clearAllMocks();
     document.body.innerHTML = originalHtmlBody;
     passedEventProcessor = undefined;
diff --git a/packages/sveltekit/src/client/index.ts b/packages/sveltekit/src/client/index.ts
index cdd2d7ba8a6e..92f3f38bcd88 100644
--- a/packages/sveltekit/src/client/index.ts
+++ b/packages/sveltekit/src/client/index.ts
@@ -1,4 +1,3 @@
 export * from '@sentry/svelte';
 
-// Just here so that eslint is happy until we export more stuff here
-export const PLACEHOLDER_CLIENT = 'PLACEHOLDER';
+export { init } from './sdk';
diff --git a/packages/sveltekit/src/client/sdk.ts b/packages/sveltekit/src/client/sdk.ts
new file mode 100644
index 000000000000..d1f0f9ac597f
--- /dev/null
+++ b/packages/sveltekit/src/client/sdk.ts
@@ -0,0 +1,18 @@
+import type { BrowserOptions } from '@sentry/svelte';
+import { configureScope, init as initSvelteSdk } from '@sentry/svelte';
+
+import { applySdkMetadata } from '../common/metadata';
+
+/**
+ *
+ * @param options
+ */
+export function init(options: BrowserOptions): void {
+  applySdkMetadata(options, ['sveltekit', 'svelte']);
+
+  initSvelteSdk(options);
+
+  configureScope(scope => {
+    scope.setTag('runtime', 'browser');
+  });
+}
diff --git a/packages/sveltekit/src/common/metadata.ts b/packages/sveltekit/src/common/metadata.ts
new file mode 100644
index 000000000000..76a9642ee36b
--- /dev/null
+++ b/packages/sveltekit/src/common/metadata.ts
@@ -0,0 +1,28 @@
+import { SDK_VERSION } from '@sentry/core';
+import type { Options, SdkInfo } from '@sentry/types';
+
+const PACKAGE_NAME_PREFIX = 'npm:@sentry/';
+
+/**
+ * A builder for the SDK metadata in the options for the SDK initialization.
+ *
+ * Note: This function is identical to `buildMetadata` in Remix and NextJS.
+ * We don't extract it for bundle size reasons.
+ * If you make changes to this function consider updating the othera as well.
+ *
+ * @param options SDK options object that gets mutated
+ * @param names list of package names
+ */
+export function applySdkMetadata(options: Options, names: string[]): void {
+  options._metadata = options._metadata || {};
+  options._metadata.sdk =
+    options._metadata.sdk ||
+    ({
+      name: 'sentry.javascript.sveltekit',
+      packages: names.map(name => ({
+        name: `${PACKAGE_NAME_PREFIX}${name}`,
+        version: SDK_VERSION,
+      })),
+      version: SDK_VERSION,
+    } as SdkInfo);
+}
diff --git a/packages/sveltekit/src/server/index.ts b/packages/sveltekit/src/server/index.ts
index 04654fecd19a..6ac8d97b4241 100644
--- a/packages/sveltekit/src/server/index.ts
+++ b/packages/sveltekit/src/server/index.ts
@@ -1,4 +1,3 @@
 export * from '@sentry/node';
 
-// Just here so that eslint is happy until we export more stuff here
-export const PLACEHOLDER_SERVER = 'PLACEHOLDER';
+export { init } from './sdk';
diff --git a/packages/sveltekit/src/server/sdk.ts b/packages/sveltekit/src/server/sdk.ts
new file mode 100644
index 000000000000..1d1bbdbf2674
--- /dev/null
+++ b/packages/sveltekit/src/server/sdk.ts
@@ -0,0 +1,19 @@
+import { configureScope } from '@sentry/core';
+import type { NodeOptions } from '@sentry/node';
+import { init as initNodeSdk } from '@sentry/node';
+
+import { applySdkMetadata } from '../common/metadata';
+
+/**
+ *
+ * @param options
+ */
+export function init(options: NodeOptions): void {
+  applySdkMetadata(options, ['sveltekit', 'node']);
+
+  initNodeSdk(options);
+
+  configureScope(scope => {
+    scope.setTag('runtime', 'node');
+  });
+}
diff --git a/packages/sveltekit/test/client/sdk.test.ts b/packages/sveltekit/test/client/sdk.test.ts
new file mode 100644
index 000000000000..5ed924a60ccc
--- /dev/null
+++ b/packages/sveltekit/test/client/sdk.test.ts
@@ -0,0 +1,49 @@
+import { getCurrentHub } from '@sentry/core';
+import * as SentrySvelte from '@sentry/svelte';
+import { SDK_VERSION, WINDOW } from '@sentry/svelte';
+
+import { init } from '../../src/client/sdk';
+const svelteInit = jest.spyOn(SentrySvelte, 'init');
+
+describe('Sentry client SDK', () => {
+  describe('init', () => {
+    afterEach(() => {
+      jest.clearAllMocks();
+      WINDOW.__SENTRY__.hub = undefined;
+    });
+
+    it('adds SvelteKit metadata to the SDK options', () => {
+      expect(svelteInit).not.toHaveBeenCalled();
+
+      init({});
+
+      expect(svelteInit).toHaveBeenCalledTimes(1);
+      expect(svelteInit).toHaveBeenCalledWith(
+        expect.objectContaining({
+          _metadata: {
+            sdk: {
+              name: 'sentry.javascript.sveltekit',
+              version: SDK_VERSION,
+              packages: [
+                { name: 'npm:@sentry/sveltekit', version: SDK_VERSION },
+                { name: 'npm:@sentry/svelte', version: SDK_VERSION },
+              ],
+            },
+          },
+        }),
+      );
+    });
+
+    it('sets the runtime tag on the scope', () => {
+      const currentScope = getCurrentHub().getScope();
+
+      // @ts-ignore need access to protected _tags attribute
+      expect(currentScope._tags).toEqual({});
+
+      init({ dsn: 'https://public@dsn.ingest.sentry.io/1337' });
+
+      // @ts-ignore need access to protected _tags attribute
+      expect(currentScope._tags).toEqual({ runtime: 'browser' });
+    });
+  });
+});
diff --git a/packages/sveltekit/test/server/sdk.test.ts b/packages/sveltekit/test/server/sdk.test.ts
new file mode 100644
index 000000000000..785cf158e5c8
--- /dev/null
+++ b/packages/sveltekit/test/server/sdk.test.ts
@@ -0,0 +1,51 @@
+import { getCurrentHub } from '@sentry/core';
+import * as SentryNode from '@sentry/node';
+import { SDK_VERSION } from '@sentry/node';
+import { GLOBAL_OBJ } from '@sentry/utils';
+
+import { init } from '../../src/server/sdk';
+
+const nodeInit = jest.spyOn(SentryNode, 'init');
+
+describe('Sentry server SDK', () => {
+  describe('init', () => {
+    afterEach(() => {
+      jest.clearAllMocks();
+      GLOBAL_OBJ.__SENTRY__.hub = undefined;
+    });
+
+    it('adds SvelteKit metadata to the SDK options', () => {
+      expect(nodeInit).not.toHaveBeenCalled();
+
+      init({});
+
+      expect(nodeInit).toHaveBeenCalledTimes(1);
+      expect(nodeInit).toHaveBeenCalledWith(
+        expect.objectContaining({
+          _metadata: {
+            sdk: {
+              name: 'sentry.javascript.sveltekit',
+              version: SDK_VERSION,
+              packages: [
+                { name: 'npm:@sentry/sveltekit', version: SDK_VERSION },
+                { name: 'npm:@sentry/node', version: SDK_VERSION },
+              ],
+            },
+          },
+        }),
+      );
+    });
+
+    it('sets the runtime tag on the scope', () => {
+      const currentScope = getCurrentHub().getScope();
+
+      // @ts-ignore need access to protected _tags attribute
+      expect(currentScope._tags).toEqual({});
+
+      init({ dsn: 'https://public@dsn.ingest.sentry.io/1337' });
+
+      // @ts-ignore need access to protected _tags attribute
+      expect(currentScope._tags).toEqual({ runtime: 'node' });
+    });
+  });
+});