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diff --git a/‎content/providers/01-ai-sdk-providers/08-amazon-bedrock.mdx‎
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diff --git a/‎content/providers/01-ai-sdk-providers/16-google-vertex.mdx‎
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diff --git a/‎packages/amazon-bedrock/src/bedrock-prepare-tools.ts‎
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diff --git a/‎packages/anthropic/src/anthropic-messages-language-model.ts‎
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@@ -0,0 +1,7 @@
+---
+'@ai-sdk/google-vertex': patch
+'@ai-sdk/anthropic': patch
+'@ai-sdk/amazon-bedrock': patch
+---
+
+fix(vertex): throw warning when strict: true for vertexAnthropic
@@ -546,6 +546,11 @@ Via Anthropic, Amazon Bedrock provides three provider-defined tools that can be
 
 They are available via the `tools` property of the provider instance.
 
+<Note>
+  Amazon Bedrock does not support strict mode on tool definitions. Setting
+  `strict: true` on a tool will be ignored and a warning will be emitted.
+</Note>
+
 ### Bash Tool
 
 The Bash Tool allows running bash commands. Here's how to create and use it:
 
@@ -1548,6 +1548,12 @@ Google Vertex Anthropic supports a subset of Anthropic's built-in tools. The fol
   `@ai-sdk/anthropic` provider if you need access to all Anthropic tools.
 </Note>
 
+<Note>
+  Google Vertex Anthropic does not support strict mode on tool definitions.
+  Setting `strict: true` on a tool will be ignored and a warning will be
+  emitted.
+</Note>
+
 For more background on Anthropic tools, see [Anthropic's documentation](https://platform.claude.com/docs/en/agents-and-tools/tool-use/overview).
 
 #### Bash Tool
 
@@ -82,6 +82,7 @@ export async function prepareTools({
       tools: ProviderTools,
       toolChoice,
       supportsStructuredOutput: false,
+      supportsStrictTools: false,
     });
 
     toolWarnings.push(...anthropicToolWarnings);
 
@@ -129,6 +129,12 @@ type AnthropicMessagesConfig = {
    * When false, the model will use JSON tool fallback for structured outputs.
    */
   supportsNativeStructuredOutput?: boolean;
+
+  /**
+   * When false, `strict` on tool definitions will be ignored and a warning emitted.
+   * Defaults to true.
+   */
+  supportsStrictTools?: boolean;
 };
 
 export class AnthropicMessagesLanguageModel implements LanguageModelV3 {
@@ -270,6 +276,10 @@ export class AnthropicMessagesLanguageModel implements LanguageModelV3 {
       (this.config.supportsNativeStructuredOutput ?? true) &&
       modelSupportsStructuredOutput;
 
+    const supportsStrictTools =
+      (this.config.supportsStrictTools ?? true) &&
+      modelSupportsStructuredOutput;
+
     const structureOutputMode =
       anthropicOptions?.structuredOutputMode ?? 'auto';
     const useStructuredOutput =
@@ -614,13 +624,15 @@ export class AnthropicMessagesLanguageModel implements LanguageModelV3 {
             disableParallelToolUse: true,
             cacheControlValidator,
             supportsStructuredOutput: false,
+            supportsStrictTools,
           }
         : {
             tools: tools ?? [],
             toolChoice,
             disableParallelToolUse: anthropicOptions?.disableParallelToolUse,
             cacheControlValidator,
             supportsStructuredOutput,
+            supportsStrictTools,
           },
     );