From 361320cd9ff342b5212e7e1b7a1636ca89f57c9c Mon Sep 17 00:00:00 2001
From: Vincent Koc <vincentkoc@ieee.org>
Date: Fri, 19 Jun 2026 01:16:31 +0800
Subject: [PATCH] refactor(text): remove unused final tag predicate

---
 src/gateway/gateway-models.profiles.live.test.ts | 4 ++--
 src/shared/text/final-tags.ts                    | 5 -----
 2 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/src/gateway/gateway-models.profiles.live.test.ts b/src/gateway/gateway-models.profiles.live.test.ts
index e8dedb699fad..e5f9aaac4cff 100644
--- a/src/gateway/gateway-models.profiles.live.test.ts
+++ b/src/gateway/gateway-models.profiles.live.test.ts
@@ -58,7 +58,7 @@ import { resolveProviderThinkingProfile } from "../plugins/provider-runtime.js";
 import type { ProviderThinkingModelCompat } from "../plugins/provider-thinking.types.js";
 import { DEFAULT_AGENT_ID } from "../routing/session-key.js";
 import { stripAssistantInternalScaffolding } from "../shared/text/assistant-visible-text.js";
-import { containsFinalTag, stripFinalTags } from "../shared/text/final-tags.js";
+import { findFinalTagMatches, stripFinalTags } from "../shared/text/final-tags.js";
 import { GATEWAY_CLIENT_MODES, GATEWAY_CLIENT_NAMES } from "../utils/message-channel.js";
 import { GatewayClient } from "./client.js";
 import {
@@ -598,7 +598,7 @@ function assertNoReasoningTags(params: {
   if (!params.text) {
     return;
   }
-  if (THINKING_TAG_RE.test(params.text) || containsFinalTag(params.text)) {
+  if (THINKING_TAG_RE.test(params.text) || findFinalTagMatches(params.text).length > 0) {
     const snippet = params.text.length > 200 ? `${params.text.slice(0, 200)}…` : params.text;
     throw new Error(
       `[${params.label}] reasoning tag leak (${params.model} / ${params.phase}): ${snippet}`,
diff --git a/src/shared/text/final-tags.ts b/src/shared/text/final-tags.ts
index a810f78661fb..d49f290926f5 100644
--- a/src/shared/text/final-tags.ts
+++ b/src/shared/text/final-tags.ts
@@ -130,11 +130,6 @@ export function findFinalTagMatches(text: string): FinalTagMatch[] {
   return matches;
 }
 
-/** Returns true when text contains at least one valid `<final>` control tag. */
-export function containsFinalTag(text: string): boolean {
-  return findFinalTagMatches(text).length > 0;
-}
-
 /** Removes valid `<final>` tags while preserving their enclosed visible answer text. */
 export function stripFinalTags(text: string): string {
   let output = "";