diff --git a/packages/coding-agent/src/slash-commands/builtin-registry.ts b/packages/coding-agent/src/slash-commands/builtin-registry.ts
index 5a783618a..992c84789 100644
--- a/packages/coding-agent/src/slash-commands/builtin-registry.ts
+++ b/packages/coding-agent/src/slash-commands/builtin-registry.ts
@@ -62,6 +62,19 @@ function refreshStatusLine(ctx: InteractiveModeContext): void {
 	ctx.ui.requestRender();
 }
 
+/** `/fast status` label: "off", "on", or scope-qualified "on (… only)". */
+function formatFastModeStatus(session: AgentSession): string {
+	if (!session.isFastModeEnabled()) return "off";
+	switch (session.serviceTier) {
+		case "openai-only":
+			return "on (OpenAI only)";
+		case "claude-only":
+			return "on (Claude only)";
+		default:
+			return "on";
+	}
+}
+
 /** Scheme-less display form of a browser deep link: accent + underline, OSC-8 linked to the full URL. */
 function collabWebLinkClickable(webLink: string): string {
 	const display = theme.fg("accent", `\x1b[4m${webLink.replace(/^https?:\/\//, "")}\x1b[24m`);
@@ -359,15 +372,7 @@ const BUILTIN_SLASH_COMMAND_REGISTRY: ReadonlyArray<SlashCommandSpec> = [
 				return commandConsumed();
 			}
 			if (arg === "status") {
-				const tier = runtime.session.serviceTier;
-				const label = !runtime.session.isFastModeEnabled()
-					? "off"
-					: tier === "openai-only"
-						? "on (OpenAI only)"
-						: tier === "claude-only"
-							? "on (Claude only)"
-							: "on";
-				await runtime.output(`Fast mode is ${label}.`);
+				await runtime.output(`Fast mode is ${formatFastModeStatus(runtime.session)}.`);
 				return commandConsumed();
 			}
 			return usage("Usage: /fast [on|off|status]", runtime);
@@ -396,15 +401,7 @@ const BUILTIN_SLASH_COMMAND_REGISTRY: ReadonlyArray<SlashCommandSpec> = [
 				return;
 			}
 			if (arg === "status") {
-				const tier = runtime.ctx.session.serviceTier;
-				const label = !runtime.ctx.session.isFastModeEnabled()
-					? "off"
-					: tier === "openai-only"
-						? "on (OpenAI only)"
-						: tier === "claude-only"
-							? "on (Claude only)"
-							: "on";
-				runtime.ctx.showStatus(`Fast mode is ${label}.`);
+				runtime.ctx.showStatus(`Fast mode is ${formatFastModeStatus(runtime.ctx.session)}.`);
 				runtime.ctx.editor.setText("");
 				return;
 			}