Add immediate flag to hook commands for non-queued execution

Commands with immediate: true run right away even during streaming.
Used for UI-only commands like /snake that don't interact with LLM.

packages/coding-agent/examples/hooks/snake.ts

@@ -233,6 +233,7 @@ class SnakeComponent {
 export default function (pi: HookAPI) {
 	pi.registerCommand("snake", {
 		description: "Play Snake!",
+		immediate: true, // Run immediately, even during streaming
 		handler: async (ctx) => {
 			if (!ctx.hasUI) {
 				ctx.ui.notify("Snake requires interactive mode", "error");

packages/coding-agent/src/core/hooks/types.ts

@@ -405,6 +405,8 @@ export interface HookCommandContext {
 export interface RegisteredCommand {
 	name: string;
 	description?: string;
+	/** If true, command runs immediately even during streaming (doesn't get queued) */
+	immediate?: boolean;
 	handler: (ctx: HookCommandContext) => Promise<void>;
 }
 
@@ -478,7 +480,10 @@ export interface HookAPI {
 	 * Register a custom slash command.
 	 * Handler receives HookCommandContext.
 	 */
-	registerCommand(name: string, options: { description?: string; handler: RegisteredCommand["handler"] }): void;
+	registerCommand(
+		name: string,
+		options: { description?: string; immediate?: boolean; handler: RegisteredCommand["handler"] },
+	): void;
 
 	/**
 	 * Execute a shell command and return stdout/stderr/code.

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

@@ -752,6 +752,20 @@ export class InteractiveMode {
 				return;
 			}
 
+			// Check if this is an immediate hook command (runs even during streaming)
+			if (text.startsWith("/") && this.session.hookRunner && this.session.isStreaming) {
+				const spaceIndex = text.indexOf(" ");
+				const commandName = spaceIndex === -1 ? text.slice(1) : text.slice(1, spaceIndex);
+				const command = this.session.hookRunner.getCommand(commandName);
+				if (command?.immediate) {
+					// Execute immediate hook command right away
+					this.editor.addToHistory(text);
+					this.editor.setText("");
+					await this.session.prompt(text);
+					return;
+				}
+			}
+
 			// Queue message if agent is streaming
 			if (this.session.isStreaming) {
 				await this.session.queueMessage(text);