fix(llm): prevent Gemini thinking from being enabled when clamped to off

aniruddhaadak80 · aniruddhaadak80 · commit da69a18f7294 · 2026-07-08T09:27:57.000+05:30
Fixes #101785
diff --git a/packages/ai/src/providers/google-shared.ts b/packages/ai/src/providers/google-shared.ts
@@ -35,7 +35,7 @@ import { stripSystemPromptCacheBoundary } from "../utils/system-prompt-cache-bou
 import { describeToolResultMediaPlaceholder, extractToolResultText } from "./tool-result-text.js";
 import { transformMessages } from "./transform-messages.js";
 
-type GoogleApiType = "google-generative-ai" | "google-vertex";
+export type GoogleApiType = "google-generative-ai" | "google-vertex";
 
 /**
  * Thinking level for Gemini 3 models.
@@ -48,9 +48,9 @@ export type GoogleThinkingLevel =
   | "MEDIUM"
   | "HIGH";
 
-type GoogleToolChoice = "auto" | "none" | "any";
+export type GoogleToolChoice = "auto" | "none" | "any";
 
-type GoogleThinkingOptions = {
+export type GoogleThinkingOptions = {
   enabled: boolean;
   budgetTokens?: number;
   level?: GoogleThinkingLevel;
@@ -86,7 +86,7 @@ type ClampedGoogleThinkingLevel = Exclude<AgentThinkingLevel, "xhigh" | "max">;
  *
  * See: https://ai.google.dev/gemini-api/docs/thought-signatures
  */
-function isThinkingPart(part: Pick<Part, "thought" | "thoughtSignature">): boolean {
+export function isThinkingPart(part: Pick<Part, "thought" | "thoughtSignature">): boolean {
   return part.thought === true;
 }
 
@@ -557,8 +557,11 @@ export function buildGoogleSimpleThinking<T extends GoogleApiType>(
   }
 
   const clampedReasoning = clampThinkingLevel(model, options.reasoning);
+  if (clampedReasoning === "off") {
+    return { enabled: false };
+  }
   const effort = (
-    clampedReasoning === "off" || clampedReasoning === "max" ? "high" : clampedReasoning
+    clampedReasoning === "max" ? "high" : clampedReasoning
   ) as ClampedGoogleThinkingLevel;
 
   if (
@@ -615,11 +618,11 @@ export function isGemma4Model<T extends GoogleApiType>(model: Model<T>): boolean
   return /gemma-?4/.test(model.id.toLowerCase());
 }
 
-function isGemini3ProModel<T extends GoogleApiType>(model: Model<T>): boolean {
+export function isGemini3ProModel<T extends GoogleApiType>(model: Model<T>): boolean {
   return /gemini-3(?:\.\d+)?-pro/.test(model.id.toLowerCase());
 }
 
-function isGemini3FlashModel<T extends GoogleApiType>(model: Model<T>): boolean {
+export function isGemini3FlashModel<T extends GoogleApiType>(model: Model<T>): boolean {
   return /gemini-3(?:\.\d+)?-flash/.test(model.id.toLowerCase());
 }
 
