diff --git a/backend/src/federation/client/1_0/model/OpenConnectionArgs.ts b/backend/src/federation/client/1_0/model/OpenConnectionArgs.ts
index 9752f4e6f..88fad8a08 100644
--- a/backend/src/federation/client/1_0/model/OpenConnectionArgs.ts
+++ b/backend/src/federation/client/1_0/model/OpenConnectionArgs.ts
@@ -1,10 +1,13 @@
+import { IsString } from 'class-validator'
 import { ArgsType, Field } from 'type-graphql'
 
 @ArgsType()
 export class OpenConnectionArgs {
   @Field(() => String)
+  @IsString()
   publicKey: string
 
   @Field(() => String)
+  @IsString()
   url: string
 }
diff --git a/federation/src/graphql/api/1_0/model/AuthenticationArgs.ts b/federation/src/graphql/api/1_0/model/AuthenticationArgs.ts
index 5adc476a0..523810d40 100644
--- a/federation/src/graphql/api/1_0/model/AuthenticationArgs.ts
+++ b/federation/src/graphql/api/1_0/model/AuthenticationArgs.ts
@@ -1,10 +1,13 @@
+import { IsString, IsUUID } from 'class-validator'
 import { Field, InputType } from 'type-graphql'
 
 @InputType()
 export class AuthenticationArgs {
   @Field(() => String)
+  @IsString()
   oneTimeCode: string
 
   @Field(() => String)
+  @IsUUID('4')
   uuid: string
 }
diff --git a/federation/src/graphql/api/1_0/model/OpenConnectionArgs.ts b/federation/src/graphql/api/1_0/model/OpenConnectionArgs.ts
index 9afdbca5f..197e2522e 100644
--- a/federation/src/graphql/api/1_0/model/OpenConnectionArgs.ts
+++ b/federation/src/graphql/api/1_0/model/OpenConnectionArgs.ts
@@ -1,10 +1,13 @@
+import { IsString } from 'class-validator'
 import { Field, InputType } from 'type-graphql'
 
 @InputType()
 export class OpenConnectionArgs {
   @Field(() => String)
+  @IsString()
   publicKey: string
 
   @Field(() => String)
+  @IsString()
   url: string
 }
diff --git a/federation/src/graphql/schema.ts b/federation/src/graphql/schema.ts
index 9d39f1398..d1be63b00 100644
--- a/federation/src/graphql/schema.ts
+++ b/federation/src/graphql/schema.ts
@@ -11,7 +11,6 @@ const schema = async (): Promise<GraphQLSchema> => {
     resolvers: [getApiResolvers()],
     // authChecker: isAuthorized,
     scalarsMap: [{ type: Decimal, scalar: DecimalScalar }],
-    /*
     validate: {
       validationError: { target: false },
       skipMissingProperties: true,
@@ -20,7 +19,6 @@ const schema = async (): Promise<GraphQLSchema> => {
       forbidUnknownValues: true,
       stopAtFirstError: true,
     },
-    */
   })
 }