diff --git a/src/handlers/services/hooksService.ts b/src/handlers/services/hooksService.ts
index f8ff3f9f8..d49d22379 100644
--- a/src/handlers/services/hooksService.ts
+++ b/src/handlers/services/hooksService.ts
@@ -22,6 +22,7 @@ export class HooksService {
       afterRequestHooks,
       endpoint,
       requestHeaders,
+      providerOption,
     } = this.requestContext;
     const hookSpan = this.hooksManager.createSpan(
       params,
@@ -32,7 +33,8 @@ export class HooksService {
       afterRequestHooks,
       null,
       endpoint,
-      requestHeaders
+      requestHeaders,
+      providerOption.includeHookTransformedData ?? false
     );
     return hookSpan;
   }
diff --git a/src/middlewares/hooks/index.ts b/src/middlewares/hooks/index.ts
index edbcfadd3..8b14bf874 100644
--- a/src/middlewares/hooks/index.ts
+++ b/src/middlewares/hooks/index.ts
@@ -24,6 +24,7 @@ export class HookSpan {
     afterRequestHooksResult: HookResult[];
   };
   private parentHookSpanId: string | null;
+  public readonly includeHookTransformedData: boolean;
   public readonly id: string;
 
   constructor(
@@ -35,7 +36,8 @@ export class HookSpan {
     afterRequestHooks: HookObject[],
     parentHookSpanId: string | null,
     requestType: string,
-    requestHeaders: Record<string, string>
+    requestHeaders: Record<string, string>,
+    includeHookTransformedData: boolean = false
   ) {
     this.context = this.createContext(
       requestParams,
@@ -54,6 +56,7 @@ export class HookSpan {
       'afterRequestHook'
     );
     this.parentHookSpanId = parentHookSpanId;
+    this.includeHookTransformedData = includeHookTransformedData;
     this.hooksResult = {
       beforeRequestHooksResult: [],
       afterRequestHooksResult: [],
@@ -216,7 +219,8 @@ export class HooksManager {
     afterRequestHooks: HookObject[],
     parentHookSpanId: string | null,
     requestType: string,
-    requestHeaders: Record<string, string>
+    requestHeaders: Record<string, string>,
+    includeHookTransformedData: boolean = false
   ): HookSpan {
     const span = new HookSpan(
       requestParams,
@@ -227,7 +231,8 @@ export class HooksManager {
       afterRequestHooks,
       parentHookSpanId,
       requestType,
-      requestHeaders
+      requestHeaders,
+      includeHookTransformedData
     );
 
     this.spans[span.id] = span;
@@ -357,7 +362,9 @@ export class HooksManager {
             result.transformedData.request.json
           );
         }
-        delete result.transformedData;
+        if (!span.includeHookTransformedData) {
+          delete result.transformedData;
+        }
         checkResults.push(result);
       }
     }
@@ -384,7 +391,9 @@ export class HooksManager {
               result.transformedData.request.json
             );
           }
-          delete result.transformedData;
+          if (!span.includeHookTransformedData) {
+            delete result.transformedData;
+          }
           checkResults.push(result);
         }
       } else {
@@ -412,7 +421,9 @@ export class HooksManager {
               checkResult.transformedData.request.json
             );
           }
-          delete checkResult.transformedData;
+          if (!span.includeHookTransformedData) {
+            delete checkResult.transformedData;
+          }
         });
       }
     }
diff --git a/src/middlewares/requestValidator/schema/config.ts b/src/middlewares/requestValidator/schema/config.ts
index 2854ae578..55498e1c8 100644
--- a/src/middlewares/requestValidator/schema/config.ts
+++ b/src/middlewares/requestValidator/schema/config.ts
@@ -100,6 +100,7 @@ export const configSchema: any = z
     before_request_hooks: z
       .array(z.object({}).catchall(z.any())) // Allows any object structure
       .optional(),
+    include_hook_transformed_data: z.boolean().optional(),
     input_guardrails: z
       .union([
         z.array(z.string()),
diff --git a/src/types/requestBody.ts b/src/types/requestBody.ts
index cbc8395de..0cbc8480a 100644
--- a/src/types/requestBody.ts
+++ b/src/types/requestBody.ts
@@ -133,6 +133,8 @@ export interface Options {
   beforeRequestHooks?: HookObject[];
   defaultInputGuardrails?: HookObject[];
   defaultOutputGuardrails?: HookObject[];
+  /** Include hook transformedData in hook_results for debugging/testing */
+  includeHookTransformedData?: boolean;
   /** OpenAI specific */
   openaiProject?: string;
   openaiOrganization?: string;
diff --git a/tests/unit/src/handlers/services/hooksService.test.ts b/tests/unit/src/handlers/services/hooksService.test.ts
index 46ace8f4e..fb268e918 100644
--- a/tests/unit/src/handlers/services/hooksService.test.ts
+++ b/tests/unit/src/handlers/services/hooksService.test.ts
@@ -9,7 +9,7 @@ import {
 } from '../../../../../src/middlewares/hooks/types';
 
 // Mock the HooksManager and HookSpan
-jest.mock('../../../middlewares/hooks');
+jest.mock('../../../../../src/middlewares/hooks');
 
 describe('HooksService', () => {
   let mockRequestContext: RequestContext;
@@ -37,6 +37,7 @@ describe('HooksService', () => {
       afterRequestHooks: [],
       endpoint: 'chatComplete',
       requestHeaders: {},
+      providerOption: {},
       hooksManager: mockHooksManager,
     } as unknown as RequestContext;
 
@@ -54,7 +55,8 @@ describe('HooksService', () => {
         mockRequestContext.afterRequestHooks,
         null,
         mockRequestContext.endpoint,
-        mockRequestContext.requestHeaders
+        mockRequestContext.requestHeaders,
+        false
       );
     });
   });
diff --git a/tests/unit/src/middlewares/hooks/index.test.ts b/tests/unit/src/middlewares/hooks/index.test.ts
new file mode 100644
index 000000000..13eb9cf6c
--- /dev/null
+++ b/tests/unit/src/middlewares/hooks/index.test.ts
@@ -0,0 +1,92 @@
+import { HOOKS_EVENT_TYPE_PRESETS } from '../../../../../src/middlewares/hooks/globals';
+import { HooksManager } from '../../../../../src/middlewares/hooks';
+import {
+  HookObject,
+  HookType,
+} from '../../../../../src/middlewares/hooks/types';
+
+jest.mock('../../../../../plugins', () => ({
+  plugins: {
+    test: {
+      transform: jest.fn(async () => ({
+        verdict: true,
+        data: null,
+        transformed: true,
+        transformedData: {
+          request: {
+            json: {
+              messages: [{ role: 'user', content: 'transformed message' }],
+            },
+          },
+          response: { json: null },
+        },
+      })),
+    },
+  },
+}));
+
+describe('HooksManager transformedData results', () => {
+  const createManagerWithTransformHook = (
+    includeHookTransformedData = false
+  ) => {
+    const hooksManager = new HooksManager();
+    const hook: HookObject = {
+      id: 'test-hook',
+      type: HookType.MUTATOR,
+      checks: [{ id: 'test.transform', parameters: {} }],
+    } as HookObject;
+
+    const span = hooksManager.createSpan(
+      { messages: [{ role: 'user', content: 'original message' }] },
+      {},
+      'openai',
+      false,
+      [hook],
+      [],
+      null,
+      'chatComplete',
+      {},
+      includeHookTransformedData
+    );
+
+    return { hooksManager, span };
+  };
+
+  it('omits transformedData from hook results by default', async () => {
+    const { hooksManager, span } = createManagerWithTransformHook();
+
+    await hooksManager.executeHooks(
+      span.id,
+      [HOOKS_EVENT_TYPE_PRESETS.SYNC_BEFORE_REQUEST_HOOK],
+      { env: {} }
+    );
+
+    const checkResult =
+      span.getHooksResult().beforeRequestHooksResult[0].checks[0];
+
+    expect(checkResult.transformed).toBe(true);
+    expect(checkResult.transformedData).toBeUndefined();
+  });
+
+  it('includes transformedData in hook results when enabled', async () => {
+    const { hooksManager, span } = createManagerWithTransformHook(true);
+
+    await hooksManager.executeHooks(
+      span.id,
+      [HOOKS_EVENT_TYPE_PRESETS.SYNC_BEFORE_REQUEST_HOOK],
+      { env: {} }
+    );
+
+    const checkResult =
+      span.getHooksResult().beforeRequestHooksResult[0].checks[0];
+
+    expect(checkResult.transformedData).toEqual({
+      request: {
+        json: {
+          messages: [{ role: 'user', content: 'transformed message' }],
+        },
+      },
+      response: { json: null },
+    });
+  });
+});