diff --git a/packages/pi-coding-agent/src/modes/interactive/components/provider-manager.ts b/packages/pi-coding-agent/src/modes/interactive/components/provider-manager.ts
index 718d68030..4d45fa725 100644
--- a/packages/pi-coding-agent/src/modes/interactive/components/provider-manager.ts
+++ b/packages/pi-coding-agent/src/modes/interactive/components/provider-manager.ts
@@ -43,6 +43,7 @@ export class ProviderManagerComponent extends Container implements Focusable {
 	private modelsJsonWriter: ModelsJsonWriter;
 	private onDone: () => void;
 	private onDiscover: (provider: string) => void;
+	private onSetupAuth: (provider: string) => void;
 	private confirmingRemove = false;
 	private hintsContainer: Container;
 
@@ -52,6 +53,7 @@ export class ProviderManagerComponent extends Container implements Focusable {
 		modelRegistry: ModelRegistry,
 		onDone: () => void,
 		onDiscover: (provider: string) => void,
+		onSetupAuth?: (provider: string) => void,
 	) {
 		super();
 
@@ -61,6 +63,7 @@ export class ProviderManagerComponent extends Container implements Focusable {
 		this.modelsJsonWriter = new ModelsJsonWriter(this.modelRegistry.modelsJsonPath);
 		this.onDone = onDone;
 		this.onDiscover = onDiscover;
+		this.onSetupAuth = onSetupAuth ?? (() => {});
 
 		// Header
 		this.addChild(new Text(theme.fg("accent", "Provider Manager"), 0, 0));
@@ -125,6 +128,7 @@ export class ProviderManagerComponent extends Container implements Focusable {
 			this.hintsContainer.addChild(new Text(hints, 0, 0));
 		} else {
 			const hints = [
+				rawKeyHint("enter", "setup auth"),
 				rawKeyHint("d", "discover"),
 				rawKeyHint("r", "remove auth"),
 				rawKeyHint("esc", "close"),
@@ -203,6 +207,12 @@ export class ProviderManagerComponent extends Container implements Focusable {
 					this.tui.requestRender();
 				}
 			}
+		} else if (kb.matches(keyData, "selectConfirm")) {
+			// Enter key → initiate auth setup for the selected provider (#3579)
+			const provider = this.providers[this.selectedIndex];
+			if (provider) {
+				this.onSetupAuth(provider.name);
+			}
 		}
 	}
 }
diff --git a/packages/pi-coding-agent/src/modes/interactive/interactive-mode.ts b/packages/pi-coding-agent/src/modes/interactive/interactive-mode.ts
index ca98db678..80255d8de 100644
--- a/packages/pi-coding-agent/src/modes/interactive/interactive-mode.ts
+++ b/packages/pi-coding-agent/src/modes/interactive/interactive-mode.ts
@@ -3411,6 +3411,11 @@ export class InteractiveMode {
 					done();
 					this.ui.requestRender();
 				},
+				async (provider: string) => {
+					// Enter key → auth setup for selected provider (#3579)
+					done();
+					await this.showLoginDialog(provider);
+				},
 			);
 			return { component, focus: component };
 		});
diff --git a/src/tests/provider-manager-enter-key.test.ts b/src/tests/provider-manager-enter-key.test.ts
new file mode 100644
index 000000000..ada68f245
--- /dev/null
+++ b/src/tests/provider-manager-enter-key.test.ts
@@ -0,0 +1,46 @@
+/**
+ * Regression test for #3579 — Enter key initiates auth setup in provider manager
+ *
+ * The provider manager component did not handle the Enter key, leaving users
+ * unable to initiate auth setup without knowing the 'd' keyboard shortcut.
+ * The fix adds a selectConfirm handler that calls onSetupAuth.
+ *
+ * Structural verification test — reads source to confirm selectConfirm handler
+ * and onSetupAuth callback exist in provider-manager.ts.
+ */
+
+import { describe, test } from 'node:test';
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const source = readFileSync(
+  join(__dirname, '..', '..', 'packages', 'pi-coding-agent', 'src', 'modes', 'interactive', 'components', 'provider-manager.ts'),
+  'utf-8',
+);
+
+describe('provider manager Enter key handler (#3579)', () => {
+  test('onSetupAuth callback property exists', () => {
+    assert.match(source, /onSetupAuth/,
+      'onSetupAuth callback should be defined');
+  });
+
+  test('selectConfirm key handler exists', () => {
+    assert.match(source, /selectConfirm/,
+      'selectConfirm key binding should be handled');
+  });
+
+  test('onSetupAuth is called with provider name', () => {
+    assert.match(source, /this\.onSetupAuth\(provider\.name\)/,
+      'onSetupAuth should be called with provider.name');
+  });
+
+  test('setup auth hint is shown', () => {
+    assert.match(source, /setup auth/,
+      'enter key hint should mention "setup auth"');
+  });
+});