Auto-retry on transient provider errors (overloaded, rate limit, 5xx)

- Add retry logic with exponential backoff (2s, 4s, 8s) in AgentSession
- Disable Anthropic SDK built-in retries (maxRetries: 0) to allow app-level handling
- TUI shows retry status with Escape to cancel
- RPC mode: add set_auto_retry, abort_retry commands and auto_retry_start/end events
- Configurable via settings.json: retry.enabled, retry.maxRetries, retry.baseDelayMs
- Exclude context overflow errors from retry (handled by compaction)

fixes #157

packages/coding-agent/src/modes/interactive/interactive-mode.ts

@@ -102,6 +102,10 @@ export class InteractiveMode {
 	private autoCompactionLoader: Loader | null = null;
 	private autoCompactionEscapeHandler?: () => void;
 
+	// Auto-retry state
+	private retryLoader: Loader | null = null;
+	private retryEscapeHandler?: () => void;
+
 	// Hook UI state
 	private hookSelector: HookSelectorComponent | null = null;
 	private hookInput: HookInputComponent | null = null;
@@ -806,6 +810,46 @@ export class InteractiveMode {
 				this.ui.requestRender();
 				break;
 			}
+
+			case "auto_retry_start": {
+				// Set up escape to abort retry
+				this.retryEscapeHandler = this.editor.onEscape;
+				this.editor.onEscape = () => {
+					this.session.abortRetry();
+				};
+				// Show retry indicator
+				this.statusContainer.clear();
+				const delaySeconds = Math.round(event.delayMs / 1000);
+				this.retryLoader = new Loader(
+					this.ui,
+					(spinner) => theme.fg("warning", spinner),
+					(text) => theme.fg("muted", text),
+					`Retrying (${event.attempt}/${event.maxAttempts}) in ${delaySeconds}s... (esc to cancel)`,
+				);
+				this.statusContainer.addChild(this.retryLoader);
+				this.ui.requestRender();
+				break;
+			}
+
+			case "auto_retry_end": {
+				// Restore escape handler
+				if (this.retryEscapeHandler) {
+					this.editor.onEscape = this.retryEscapeHandler;
+					this.retryEscapeHandler = undefined;
+				}
+				// Stop loader
+				if (this.retryLoader) {
+					this.retryLoader.stop();
+					this.retryLoader = null;
+					this.statusContainer.clear();
+				}
+				// Show error only on final failure (success shows normal response)
+				if (!event.success) {
+					this.showError(`Retry failed after ${event.attempt} attempts: ${event.finalError || "Unknown error"}`);
+				}
+				this.ui.requestRender();
+				break;
+			}
 		}
 	}
 

packages/coding-agent/src/modes/rpc/rpc-client.ts

@@ -264,6 +264,20 @@ export class RpcClient {
 		await this.send({ type: "set_auto_compaction", enabled });
 	}
 
+	/**
+	 * Set auto-retry enabled/disabled.
+	 */
+	async setAutoRetry(enabled: boolean): Promise<void> {
+		await this.send({ type: "set_auto_retry", enabled });
+	}
+
+	/**
+	 * Abort in-progress retry.
+	 */
+	async abortRetry(): Promise<void> {
+		await this.send({ type: "abort_retry" });
+	}
+
 	/**
 	 * Execute a bash command.
 	 */

packages/coding-agent/src/modes/rpc/rpc-mode.ts

@@ -270,6 +270,20 @@ export async function runRpcMode(session: AgentSession): Promise<never> {
 				return success(id, "set_auto_compaction");
 			}
 
+			// =================================================================
+			// Retry
+			// =================================================================
+
+			case "set_auto_retry": {
+				session.setAutoRetryEnabled(command.enabled);
+				return success(id, "set_auto_retry");
+			}
+
+			case "abort_retry": {
+				session.abortRetry();
+				return success(id, "abort_retry");
+			}
+
 			// =================================================================
 			// Bash
 			// =================================================================

packages/coding-agent/src/modes/rpc/rpc-types.ts

@@ -40,6 +40,10 @@ export type RpcCommand =
 	| { id?: string; type: "compact"; customInstructions?: string }
 	| { id?: string; type: "set_auto_compaction"; enabled: boolean }
 
+	// Retry
+	| { id?: string; type: "set_auto_retry"; enabled: boolean }
+	| { id?: string; type: "abort_retry" }
+
 	// Bash
 	| { id?: string; type: "bash"; command: string }
 	| { id?: string; type: "abort_bash" }
@@ -127,6 +131,10 @@ export type RpcResponse =
 	| { id?: string; type: "response"; command: "compact"; success: true; data: CompactionResult }
 	| { id?: string; type: "response"; command: "set_auto_compaction"; success: true }
 
+	// Retry
+	| { id?: string; type: "response"; command: "set_auto_retry"; success: true }
+	| { id?: string; type: "response"; command: "abort_retry"; success: true }
+
 	// Bash
 	| { id?: string; type: "response"; command: "bash"; success: true; data: BashResult }
 	| { id?: string; type: "response"; command: "abort_bash"; success: true }