diff --git a/package.json b/package.json
index 46bac67..0770fd1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@missionsquad/rosetta-ai",
-  "version": "1.11.3",
+  "version": "1.11.4",
   "description": "Unified TypeScript SDK for interacting with multiple AI providers (Anthropic, Google, Groq, OpenAI).",
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",
diff --git a/src/core/mapping/google.mapper.ts b/src/core/mapping/google.mapper.ts
index 615bd76..f60502c 100644
--- a/src/core/mapping/google.mapper.ts
+++ b/src/core/mapping/google.mapper.ts
@@ -37,6 +37,30 @@ import * as GoogleEmbedMapper from './google.embed.mapper'
 
 export class GoogleMapper implements IProviderMapper {
   readonly provider = Provider.Google
+  private static readonly ALLOWED_SCHEMA_KEYS = new Set([
+    'anyOf',
+    'default',
+    'description',
+    'enum',
+    'example',
+    'format',
+    'items',
+    'maxItems',
+    'maxLength',
+    'maxProperties',
+    'maximum',
+    'minItems',
+    'minLength',
+    'minProperties',
+    'minimum',
+    'nullable',
+    'pattern',
+    'properties',
+    'propertyOrdering',
+    'required',
+    'title',
+    'type'
+  ])
 
   // --- Parameter Mapping ---
   private mapRoleToGoogle(role: RosettaMessage['role']): 'user' | 'model' | 'function' | 'system' {
@@ -259,9 +283,13 @@ export class GoogleMapper implements IProviderMapper {
         delete cleanedSchema.items
     }
     
+    const prunedSchema = Object.fromEntries(
+      Object.entries(cleanedSchema).filter(([key]) => GoogleMapper.ALLOWED_SCHEMA_KEYS.has(key))
+    )
+
     visited.delete(schema); // Clean up visited set for this path
 
-    return cleanedSchema;
+    return prunedSchema;
   }
 
   private findLastToolCallName(history: Content[], _toolCallId: string): string | undefined {
diff --git a/tests/unit/core/mapping/google.mapper.spec.ts b/tests/unit/core/mapping/google.mapper.spec.ts
index 1c2edcc..7d2c5aa 100644
--- a/tests/unit/core/mapping/google.mapper.spec.ts
+++ b/tests/unit/core/mapping/google.mapper.spec.ts
@@ -242,6 +242,43 @@ describe('Google Mapper', () => {
       expect(functionDecl?.parameters?.properties?.location?.type).toBe('STRING')
     })
 
+    it('[Easy] should strip non-Google schema keys from tool parameters', () => {
+      const params: GenerateParams = {
+        ...baseParams,
+        messages: [{ role: 'user', content: 'Use the tool.' }],
+        tools: [
+          {
+            type: 'function',
+            function: {
+              name: 'list_timezones',
+              description: 'Lists timezones',
+              parameters: {
+                type: 'object',
+                properties: {
+                  region: {
+                    type: 'string',
+                    description: 'Optional timezone region prefix',
+                    optional: true,
+                    examples: ['America']
+                  }
+                }
+              } as any
+            }
+          }
+        ]
+      }
+
+      const result = mapper.mapToProviderParams(params) as GenerateContentParameters
+      const functionDecl = result.config?.tools?.[0]?.functionDeclarations?.[0]
+
+      expect(functionDecl?.parameters?.properties?.region).toEqual({
+        type: 'STRING',
+        description: 'Optional timezone region prefix'
+      })
+      expect((functionDecl?.parameters?.properties?.region as any)?.optional).toBeUndefined()
+      expect((functionDecl?.parameters?.properties?.region as any)?.examples).toBeUndefined()
+    })
+
     it('[Easy] should map grounding tool', () => {
       const params: GenerateParams = {
         ...baseParams,