diff --git a/packages/model-runtime/src/core/contextBuilders/anthropic.test.ts b/packages/model-runtime/src/core/contextBuilders/anthropic.test.ts
index 728784e305..06f74c1a46 100644
--- a/packages/model-runtime/src/core/contextBuilders/anthropic.test.ts
+++ b/packages/model-runtime/src/core/contextBuilders/anthropic.test.ts
@@ -125,6 +125,44 @@ describe('anthropicHelpers', () => {
 
       await expect(buildAnthropicBlock(content)).rejects.toThrow('Invalid image URL: invalid-url');
     });
+
+    it('should return undefined for unsupported SVG image (base64)', async () => {
+      vi.mocked(parseDataUri).mockReturnValueOnce({
+        mimeType: 'image/svg+xml',
+        base64: 'PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==',
+        type: 'base64',
+      });
+
+      const content = {
+        type: 'image_url',
+        image_url: {
+          url: 'data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==',
+        },
+      } as const;
+
+      const result = await buildAnthropicBlock(content);
+      expect(result).toBeUndefined();
+    });
+
+    it('should return undefined for unsupported SVG image (URL)', async () => {
+      vi.mocked(parseDataUri).mockReturnValueOnce({
+        mimeType: null,
+        base64: null,
+        type: 'url',
+      });
+      vi.mocked(imageUrlToBase64).mockResolvedValueOnce({
+        base64: 'PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==',
+        mimeType: 'image/svg+xml',
+      });
+
+      const content = {
+        type: 'image_url',
+        image_url: { url: 'https://example.com/image.svg' },
+      } as const;
+
+      const result = await buildAnthropicBlock(content);
+      expect(result).toBeUndefined();
+    });
   });
 
   describe('buildAnthropicMessage', () => {
diff --git a/packages/model-runtime/src/core/contextBuilders/anthropic.ts b/packages/model-runtime/src/core/contextBuilders/anthropic.ts
index e6cd478889..a40ee58e86 100644
--- a/packages/model-runtime/src/core/contextBuilders/anthropic.ts
+++ b/packages/model-runtime/src/core/contextBuilders/anthropic.ts
@@ -5,6 +5,19 @@ import OpenAI from 'openai';
 import { OpenAIChatMessage, UserMessageContentPart } from '../../types';
 import { parseDataUri } from '../../utils/uriParser';
 
+const ANTHROPIC_SUPPORTED_IMAGE_TYPES = new Set([
+  'image/jpeg',
+  'image/jpg',
+  'image/png',
+  'image/gif',
+  'image/webp',
+]);
+
+const isImageTypeSupported = (mimeType: string | null): boolean => {
+  if (!mimeType) return true;
+  return ANTHROPIC_SUPPORTED_IMAGE_TYPES.has(mimeType.toLowerCase());
+};
+
 export const buildAnthropicBlock = async (
   content: UserMessageContentPart,
 ): Promise<Anthropic.ContentBlock | Anthropic.ImageBlockParam | undefined> => {
@@ -23,7 +36,9 @@ export const buildAnthropicBlock = async (
     case 'image_url': {
       const { mimeType, base64, type } = parseDataUri(content.image_url.url);
 
-      if (type === 'base64')
+      if (type === 'base64') {
+        if (!isImageTypeSupported(mimeType)) return undefined;
+
         return {
           source: {
             data: base64 as string,
@@ -32,9 +47,13 @@ export const buildAnthropicBlock = async (
           },
           type: 'image',
         };
+      }
 
       if (type === 'url') {
         const { base64, mimeType } = await imageUrlToBase64(content.image_url.url);
+
+        if (!isImageTypeSupported(mimeType)) return undefined;
+
         return {
           source: {
             data: base64 as string,
diff --git a/packages/model-runtime/src/core/contextBuilders/google.test.ts b/packages/model-runtime/src/core/contextBuilders/google.test.ts
index 5a39a32c84..7d2a80dd9a 100644
--- a/packages/model-runtime/src/core/contextBuilders/google.test.ts
+++ b/packages/model-runtime/src/core/contextBuilders/google.test.ts
@@ -149,6 +149,48 @@ describe('google contextBuilders', () => {
         thoughtSignature: GEMINI_MAGIC_THOUGHT_SIGNATURE,
       });
     });
+
+    it('should return undefined for unsupported SVG image (base64)', async () => {
+      const svgBase64 =
+        'data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==';
+
+      vi.mocked(parseDataUri).mockReturnValueOnce({
+        base64: 'PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==',
+        mimeType: 'image/svg+xml',
+        type: 'base64',
+      });
+
+      const content: UserMessageContentPart = {
+        image_url: { url: svgBase64 },
+        type: 'image_url',
+      };
+
+      const result = await buildGooglePart(content);
+      expect(result).toBeUndefined();
+    });
+
+    it('should return undefined for unsupported SVG image (URL)', async () => {
+      const svgUrl = 'https://example.com/image.svg';
+
+      vi.mocked(parseDataUri).mockReturnValueOnce({
+        base64: null,
+        mimeType: null,
+        type: 'url',
+      });
+
+      vi.spyOn(imageToBase64Module, 'imageUrlToBase64').mockResolvedValueOnce({
+        base64: 'PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==',
+        mimeType: 'image/svg+xml',
+      });
+
+      const content: UserMessageContentPart = {
+        image_url: { url: svgUrl },
+        type: 'image_url',
+      };
+
+      const result = await buildGooglePart(content);
+      expect(result).toBeUndefined();
+    });
   });
 
   describe('buildGoogleMessage', () => {
diff --git a/packages/model-runtime/src/core/contextBuilders/google.ts b/packages/model-runtime/src/core/contextBuilders/google.ts
index e11f981bc6..8e174a9cda 100644
--- a/packages/model-runtime/src/core/contextBuilders/google.ts
+++ b/packages/model-runtime/src/core/contextBuilders/google.ts
@@ -11,6 +11,19 @@ import { ChatCompletionTool, OpenAIChatMessage, UserMessageContentPart } from '.
 import { safeParseJSON } from '../../utils/safeParseJSON';
 import { parseDataUri } from '../../utils/uriParser';
 
+const GOOGLE_SUPPORTED_IMAGE_TYPES = new Set([
+  'image/jpeg',
+  'image/jpg',
+  'image/png',
+  'image/gif',
+  'image/webp',
+]);
+
+const isImageTypeSupported = (mimeType: string | null): boolean => {
+  if (!mimeType) return true;
+  return GOOGLE_SUPPORTED_IMAGE_TYPES.has(mimeType.toLowerCase());
+};
+
 /**
  * Magic thoughtSignature
  * @see https://ai.google.dev/gemini-api/docs/thought-signatures#model-behavior:~:text=context_engineering_is_the_way_to_go
@@ -43,6 +56,8 @@ export const buildGooglePart = async (
           throw new TypeError("Image URL doesn't contain base64 data");
         }
 
+        if (!isImageTypeSupported(mimeType)) return undefined;
+
         return {
           inlineData: { data: base64, mimeType: mimeType || 'image/png' },
           thoughtSignature: GEMINI_MAGIC_THOUGHT_SIGNATURE,
@@ -52,6 +67,8 @@ export const buildGooglePart = async (
       if (type === 'url') {
         const { base64, mimeType } = await imageUrlToBase64(content.image_url.url);
 
+        if (!isImageTypeSupported(mimeType)) return undefined;
+
         return {
           inlineData: { data: base64, mimeType },
           thoughtSignature: GEMINI_MAGIC_THOUGHT_SIGNATURE,