diff --git a/packages/@n8n/api-types/src/dto/workflows/__tests__/create-workflow-public.dto.test.ts b/packages/@n8n/api-types/src/dto/workflows/__tests__/create-workflow-public.dto.test.ts
index 406f1b0a013..524e54c4377 100644
--- a/packages/@n8n/api-types/src/dto/workflows/__tests__/create-workflow-public.dto.test.ts
+++ b/packages/@n8n/api-types/src/dto/workflows/__tests__/create-workflow-public.dto.test.ts
@@ -73,6 +73,18 @@ describe('CreateWorkflowPublicDto', () => {
 		expect(result.success).toBe(true);
 	});
 
+	test('accepts node.extendsCredential but ignores it', () => {
+		const result = CreateWorkflowPublicDto.safeParse({
+			...validPayload,
+			nodes: [{ ...validPayload.nodes[0], extendsCredential: 'datadogApi' }],
+		});
+
+		expect(result.success).toBe(true);
+		if (result.success) {
+			expect(result.data.nodes[0]).not.toHaveProperty('extendsCredential');
+		}
+	});
+
 	test.each([
 		['accepts', 155, true],
 		['rejects', 156, false],
diff --git a/packages/@n8n/api-types/src/dto/workflows/base-workflow-public.dto.ts b/packages/@n8n/api-types/src/dto/workflows/base-workflow-public.dto.ts
index f54aa129e53..9072423c46b 100644
--- a/packages/@n8n/api-types/src/dto/workflows/base-workflow-public.dto.ts
+++ b/packages/@n8n/api-types/src/dto/workflows/base-workflow-public.dto.ts
@@ -51,10 +51,13 @@ const workflowNodeWritePublicSchema = z
 			.object({ tag: z.array(customTelemetryTagPublicSchema).optional() })
 			.strict()
 			.optional(),
+		// Accepted but ignored, this is an internal editor-produced marker for credential-only HTTP Request nodes
+		extendsCredential: z.string().optional(),
 		createdAt: readOnlyPublicSchema(readOnlyTimestampOpenApi),
 		updatedAt: readOnlyPublicSchema(readOnlyTimestampOpenApi),
 	})
-	.strict();
+	.strict()
+	.transform(({ extendsCredential: _extendsCredential, ...node }) => node);
 
 const workflowNodeGroupWritePublicSchema = z
 	.object({
diff --git a/packages/cli/src/public-api/v1/handlers/workflows/spec/paths/createWorkflow.generated.yml b/packages/cli/src/public-api/v1/handlers/workflows/spec/paths/createWorkflow.generated.yml
index 701f00810db..5b3667674ac 100644
--- a/packages/cli/src/public-api/v1/handlers/workflows/spec/paths/createWorkflow.generated.yml
+++ b/packages/cli/src/public-api/v1/handlers/workflows/spec/paths/createWorkflow.generated.yml
@@ -124,6 +124,8 @@ requestBody:
                           - value
                         additionalProperties: false
                   additionalProperties: false
+                extendsCredential:
+                  type: string
                 createdAt:
                   type: string
                   format: date-time
diff --git a/packages/cli/src/public-api/v1/handlers/workflows/spec/paths/updateWorkflow.generated.yml b/packages/cli/src/public-api/v1/handlers/workflows/spec/paths/updateWorkflow.generated.yml
index e1bbd574d74..1bbd9413409 100644
--- a/packages/cli/src/public-api/v1/handlers/workflows/spec/paths/updateWorkflow.generated.yml
+++ b/packages/cli/src/public-api/v1/handlers/workflows/spec/paths/updateWorkflow.generated.yml
@@ -141,6 +141,8 @@ requestBody:
                           - value
                         additionalProperties: false
                   additionalProperties: false
+                extendsCredential:
+                  type: string
                 createdAt:
                   type: string
                   format: date-time