diff --git a/src/ui/tui/__tests__/store.test.ts b/src/ui/tui/__tests__/store.test.ts
index 8643a030f..8f779001d 100644
--- a/src/ui/tui/__tests__/store.test.ts
+++ b/src/ui/tui/__tests__/store.test.ts
@@ -325,6 +325,55 @@ describe('WizardStore', () => {
       });
     });
 
+    it('setCredentials does not fire auth complete for null credentials', () => {
+      const store = createStore();
+      store.setCredentials(null);
+      expect(wizardCaptureMock).not.toHaveBeenCalledWith(
+        'auth complete',
+        expect.anything(),
+      );
+    });
+
+    it('setCredentials fires auth complete only once for repeated same credentials', () => {
+      const store = createStore();
+      const creds = {
+        accessToken: 'tok',
+        projectApiKey: 'pk',
+        host: HostResolution.fromApiHost('https://us.i.posthog.com'),
+        projectId: 42,
+      };
+      store.setCredentials(creds);
+      store.setCredentials({
+        ...creds,
+        host: HostResolution.fromApiHost('https://us.i.posthog.com'),
+      });
+      const authCalls = wizardCaptureMock.mock.calls.filter(
+        (call) => call[0] === 'auth complete',
+      );
+      expect(authCalls).toHaveLength(1);
+    });
+
+    it('setCredentials fires auth complete again when the project changes', () => {
+      const store = createStore();
+      const host = HostResolution.fromApiHost('https://us.i.posthog.com');
+      store.setCredentials({
+        accessToken: 'tok',
+        projectApiKey: 'pk',
+        host,
+        projectId: 42,
+      });
+      store.setCredentials({
+        accessToken: 'tok',
+        projectApiKey: 'pk',
+        host,
+        projectId: 99,
+      });
+      const authCalls = wizardCaptureMock.mock.calls.filter(
+        (call) => call[0] === 'auth complete',
+      );
+      expect(authCalls).toHaveLength(2);
+    });
+
     it('enableFeature fires feature enabled event', () => {
       const store = createStore();
       store.enableFeature(AdditionalFeature.LLM);
diff --git a/src/ui/tui/store.ts b/src/ui/tui/store.ts
index eeb818d27..f6b26dd70 100644
--- a/src/ui/tui/store.ts
+++ b/src/ui/tui/store.ts
@@ -442,13 +442,24 @@ export class WizardStore {
   }
 
   setCredentials(credentials: WizardSession['credentials']): void {
+    const previous = this.session.credentials;
     this.$session.setKey('credentials', credentials);
     if (credentials?.projectId) {
       analytics.setTag('project_id', credentials.projectId);
     }
-    analytics.wizardCapture('auth complete', {
-      project_id: credentials?.projectId,
-    });
+    // One run writes credentials up to four times (auth, MCP prompts, Slack
+    // connect, run-wizard). Capture `auth complete` only when real credentials
+    // first arrive or the project/host actually changes, so the metric counts
+    // completed auths instead of setter calls.
+    const changed =
+      credentials != null &&
+      (previous?.projectId !== credentials.projectId ||
+        previous?.host.apiHost !== credentials.host.apiHost);
+    if (changed) {
+      analytics.wizardCapture('auth complete', {
+        project_id: credentials.projectId,
+      });
+    }
     this.emitChange();
   }