diff --git a/api/relations/v0/check.pb.go b/api/relations/v0/check.pb.go
index 4d1cdc3..5479d92 100644
--- a/api/relations/v0/check.pb.go
+++ b/api/relations/v0/check.pb.go
@@ -7,6 +7,7 @@
 package v0
 
 import (
+	_ "github.com/envoyproxy/protoc-gen-validate/validate"
 	_ "google.golang.org/genproto/googleapis/api/annotations"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
@@ -189,41 +190,44 @@ var file_relations_v0_check_proto_rawDesc = []byte{
 	0x1c, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x61, 0x70, 0x69, 0x2f, 0x61, 0x6e, 0x6e, 0x6f,
 	0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x1a, 0x19, 0x72,
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+	0x22, 0x09, 0x2f, 0x76, 0x30, 0x2f, 0x63, 0x68, 0x65, 0x63, 0x6b, 0x42, 0x47, 0x0a, 0x23, 0x6f,
+	0x72, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x6a, 0x65, 0x63, 0x74, 0x5f, 0x6b, 0x65, 0x73, 0x73, 0x65,
+	0x6c, 0x2e, 0x61, 0x70, 0x69, 0x2e, 0x72, 0x65, 0x6c, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x2e,
+	0x76, 0x30, 0x50, 0x01, 0x5a, 0x1e, 0x63, 0x69, 0x61, 0x6d, 0x2d, 0x72, 0x65, 0x62, 0x61, 0x63,
+	0x2f, 0x61, 0x70, 0x69, 0x2f, 0x72, 0x65, 0x6c, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x2f, 0x76,
+	0x30, 0x3b, 0x76, 0x30, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/api/relations/v0/check.pb.validate.go b/api/relations/v0/check.pb.validate.go
index 1c98967..2556dfe 100644
--- a/api/relations/v0/check.pb.validate.go
+++ b/api/relations/v0/check.pb.validate.go
@@ -57,64 +57,45 @@ func (m *CheckRequest) validate(all bool) error {
 
 	var errors []error
 
-	if all {
-		switch v := interface{}(m.GetResource()).(type) {
-		case interface{ ValidateAll() error }:
-			if err := v.ValidateAll(); err != nil {
-				errors = append(errors, CheckRequestValidationError{
-					field:  "Resource",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
-		case interface{ Validate() error }:
-			if err := v.Validate(); err != nil {
-				errors = append(errors, CheckRequestValidationError{
-					field:  "Resource",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
+	if m.GetResource() == nil {
+		err := CheckRequestValidationError{
+			field:  "Resource",
+			reason: "value is required",
 		}
-	} else if v, ok := interface{}(m.GetResource()).(interface{ Validate() error }); ok {
-		if err := v.Validate(); err != nil {
-			return CheckRequestValidationError{
-				field:  "Resource",
-				reason: "embedded message failed validation",
-				cause:  err,
-			}
+		if !all {
+			return err
 		}
+		errors = append(errors, err)
 	}
 
-	// no validation rules for Relation
-
-	if all {
-		switch v := interface{}(m.GetSubject()).(type) {
-		case interface{ ValidateAll() error }:
-			if err := v.ValidateAll(); err != nil {
-				errors = append(errors, CheckRequestValidationError{
-					field:  "Subject",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
-		case interface{ Validate() error }:
-			if err := v.Validate(); err != nil {
-				errors = append(errors, CheckRequestValidationError{
-					field:  "Subject",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
+	if a := m.GetResource(); a != nil {
+
+	}
+
+	if utf8.RuneCountInString(m.GetRelation()) < 1 {
+		err := CheckRequestValidationError{
+			field:  "Relation",
+			reason: "value length must be at least 1 runes",
+		}
+		if !all {
+			return err
+		}
+		errors = append(errors, err)
+	}
+
+	if m.GetSubject() == nil {
+		err := CheckRequestValidationError{
+			field:  "Subject",
+			reason: "value is required",
 		}
-	} else if v, ok := interface{}(m.GetSubject()).(interface{ Validate() error }); ok {
-		if err := v.Validate(); err != nil {
-			return CheckRequestValidationError{
-				field:  "Subject",
-				reason: "embedded message failed validation",
-				cause:  err,
-			}
+		if !all {
+			return err
 		}
+		errors = append(errors, err)
+	}
+
+	if a := m.GetSubject(); a != nil {
+
 	}
 
 	if len(errors) > 0 {
diff --git a/api/relations/v0/check.proto b/api/relations/v0/check.proto
index d7ce52a..745db65 100644
--- a/api/relations/v0/check.proto
+++ b/api/relations/v0/check.proto
@@ -4,6 +4,8 @@ package kessel.relations.v0;
 
 import "google/api/annotations.proto";
 import "relations/v0/common.proto";
+import "validate/validate.proto";
+
 
 option go_package = "ciam-rebac/api/relations/v0;v0";
 option java_multiple_files = true;
@@ -21,9 +23,9 @@ service KesselCheckService {
 }
 
 message CheckRequest {
-	ObjectReference resource = 1;
-	string relation = 2;
-	SubjectReference subject = 3;
+	ObjectReference resource = 1 [(validate.rules).any.required = true];
+	string relation = 2 [(validate.rules).string.min_len = 1];
+	SubjectReference subject = 3 [(validate.rules).any.required = true];
 }
 
 message CheckResponse {
diff --git a/api/relations/v0/common.pb.go b/api/relations/v0/common.pb.go
index b1bfb0e..f244bd9 100644
--- a/api/relations/v0/common.pb.go
+++ b/api/relations/v0/common.pb.go
@@ -370,7 +370,7 @@ var file_relations_v0_common_proto_rawDesc = []byte{
 	0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x13, 0x6b, 0x65, 0x73,
 	0x73, 0x65, 0x6c, 0x2e, 0x72, 0x65, 0x6c, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x2e, 0x76, 0x30,
 	0x1a, 0x17, 0x76, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74, 0x65, 0x2f, 0x76, 0x61, 0x6c, 0x69, 0x64,
-	0x61, 0x74, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xc0, 0x01, 0x0a, 0x0c, 0x52, 0x65,
+	0x61, 0x74, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xca, 0x01, 0x0a, 0x0c, 0x52, 0x65,
 	0x6c, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x68, 0x69, 0x70, 0x12, 0x4a, 0x0a, 0x08, 0x72, 0x65,
 	0x73, 0x6f, 0x75, 0x72, 0x63, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x24, 0x2e, 0x6b,
 	0x65, 0x73, 0x73, 0x65, 0x6c, 0x2e, 0x72, 0x65, 0x6c, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x2e,
@@ -378,47 +378,50 @@ var file_relations_v0_common_proto_rawDesc = []byte{
 	0x63, 0x65, 0x42, 0x08, 0xfa, 0x42, 0x05, 0xa2, 0x01, 0x02, 0x08, 0x01, 0x52, 0x08, 0x72, 0x65,
 	0x73, 0x6f, 0x75, 0x72, 0x63, 0x65, 0x12, 0x23, 0x0a, 0x08, 0x72, 0x65, 0x6c, 0x61, 0x74, 0x69,
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+	0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/api/relations/v0/common.pb.validate.go b/api/relations/v0/common.pb.validate.go
index b49c460..6c99346 100644
--- a/api/relations/v0/common.pb.validate.go
+++ b/api/relations/v0/common.pb.validate.go
@@ -83,33 +83,19 @@ func (m *Relationship) validate(all bool) error {
 		errors = append(errors, err)
 	}
 
-	if all {
-		switch v := interface{}(m.GetSubject()).(type) {
-		case interface{ ValidateAll() error }:
-			if err := v.ValidateAll(); err != nil {
-				errors = append(errors, RelationshipValidationError{
-					field:  "Subject",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
-		case interface{ Validate() error }:
-			if err := v.Validate(); err != nil {
-				errors = append(errors, RelationshipValidationError{
-					field:  "Subject",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
+	if m.GetSubject() == nil {
+		err := RelationshipValidationError{
+			field:  "Subject",
+			reason: "value is required",
 		}
-	} else if v, ok := interface{}(m.GetSubject()).(interface{ Validate() error }); ok {
-		if err := v.Validate(); err != nil {
-			return RelationshipValidationError{
-				field:  "Subject",
-				reason: "embedded message failed validation",
-				cause:  err,
-			}
+		if !all {
+			return err
 		}
+		errors = append(errors, err)
+	}
+
+	if a := m.GetSubject(); a != nil {
+
 	}
 
 	if len(errors) > 0 {
@@ -211,33 +197,19 @@ func (m *SubjectReference) validate(all bool) error {
 
 	var errors []error
 
-	if all {
-		switch v := interface{}(m.GetSubject()).(type) {
-		case interface{ ValidateAll() error }:
-			if err := v.ValidateAll(); err != nil {
-				errors = append(errors, SubjectReferenceValidationError{
-					field:  "Subject",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
-		case interface{ Validate() error }:
-			if err := v.Validate(); err != nil {
-				errors = append(errors, SubjectReferenceValidationError{
-					field:  "Subject",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
+	if m.GetSubject() == nil {
+		err := SubjectReferenceValidationError{
+			field:  "Subject",
+			reason: "value is required",
 		}
-	} else if v, ok := interface{}(m.GetSubject()).(interface{ Validate() error }); ok {
-		if err := v.Validate(); err != nil {
-			return SubjectReferenceValidationError{
-				field:  "Subject",
-				reason: "embedded message failed validation",
-				cause:  err,
-			}
+		if !all {
+			return err
 		}
+		errors = append(errors, err)
+	}
+
+	if a := m.GetSubject(); a != nil {
+
 	}
 
 	if m.Relation != nil {
@@ -344,7 +316,16 @@ func (m *RequestPagination) validate(all bool) error {
 
 	var errors []error
 
-	// no validation rules for Limit
+	if m.GetLimit() <= 0 {
+		err := RequestPaginationValidationError{
+			field:  "Limit",
+			reason: "value must be greater than 0",
+		}
+		if !all {
+			return err
+		}
+		errors = append(errors, err)
+	}
 
 	if m.ContinuationToken != nil {
 		// no validation rules for ContinuationToken
@@ -682,9 +663,27 @@ func (m *ObjectType) validate(all bool) error {
 
 	var errors []error
 
-	// no validation rules for Namespace
+	if utf8.RuneCountInString(m.GetNamespace()) < 1 {
+		err := ObjectTypeValidationError{
+			field:  "Namespace",
+			reason: "value length must be at least 1 runes",
+		}
+		if !all {
+			return err
+		}
+		errors = append(errors, err)
+	}
 
-	// no validation rules for Name
+	if utf8.RuneCountInString(m.GetName()) < 1 {
+		err := ObjectTypeValidationError{
+			field:  "Name",
+			reason: "value length must be at least 1 runes",
+		}
+		if !all {
+			return err
+		}
+		errors = append(errors, err)
+	}
 
 	if len(errors) > 0 {
 		return ObjectTypeMultiError(errors)
diff --git a/api/relations/v0/common.proto b/api/relations/v0/common.proto
index 6767eaa..2501e38 100644
--- a/api/relations/v0/common.proto
+++ b/api/relations/v0/common.proto
@@ -20,7 +20,7 @@ option java_package = "org.project_kessel.api.relations.v0";
 message Relationship {
 	ObjectReference resource = 1 [(validate.rules).any.required = true]; 
 	string relation = 2 [(validate.rules).string.min_len = 1];
-	SubjectReference subject = 3;
+	SubjectReference subject = 3 [(validate.rules).any.required = true];
 }
 
 // A reference to a Subject or, if a `relation` is provided, a Subject Set.
@@ -28,11 +28,11 @@ message SubjectReference {
 	// An optional relation which points to a set of Subjects instead of the single Subject.
 	// e.g. "members" or "owners" of a group identified in `subject`.
 	optional string relation = 1;
-	ObjectReference subject = 2;
+	ObjectReference subject = 2 [(validate.rules).any.required = true];
 }
 
 message RequestPagination {
-	uint32 limit = 1;
+	uint32 limit = 1 [(validate.rules).uint32 = {gt: 0}];
 	optional string continuation_token = 2;
 }
 
@@ -46,6 +46,6 @@ message ObjectReference {
 }
 
 message ObjectType {
-	string namespace = 1;
-	string name = 2;
+	string namespace = 1 [(validate.rules).string.min_len = 1];
+	string name = 2 [(validate.rules).string.min_len = 1];
 }
diff --git a/api/relations/v0/relation_tuples.pb.go b/api/relations/v0/relation_tuples.pb.go
index 1f541da..bb7d35c 100644
--- a/api/relations/v0/relation_tuples.pb.go
+++ b/api/relations/v0/relation_tuples.pb.go
@@ -487,102 +487,103 @@ var file_relations_v0_relation_tuples_proto_rawDesc = []byte{
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+	0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/api/relations/v0/relation_tuples.pb.validate.go b/api/relations/v0/relation_tuples.pb.validate.go
index fa5d781..be9fab7 100644
--- a/api/relations/v0/relation_tuples.pb.validate.go
+++ b/api/relations/v0/relation_tuples.pb.validate.go
@@ -278,33 +278,19 @@ func (m *ReadTuplesRequest) validate(all bool) error {
 
 	var errors []error
 
-	if all {
-		switch v := interface{}(m.GetFilter()).(type) {
-		case interface{ ValidateAll() error }:
-			if err := v.ValidateAll(); err != nil {
-				errors = append(errors, ReadTuplesRequestValidationError{
-					field:  "Filter",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
-		case interface{ Validate() error }:
-			if err := v.Validate(); err != nil {
-				errors = append(errors, ReadTuplesRequestValidationError{
-					field:  "Filter",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
+	if m.GetFilter() == nil {
+		err := ReadTuplesRequestValidationError{
+			field:  "Filter",
+			reason: "value is required",
 		}
-	} else if v, ok := interface{}(m.GetFilter()).(interface{ Validate() error }); ok {
-		if err := v.Validate(); err != nil {
-			return ReadTuplesRequestValidationError{
-				field:  "Filter",
-				reason: "embedded message failed validation",
-				cause:  err,
-			}
+		if !all {
+			return err
 		}
+		errors = append(errors, err)
+	}
+
+	if a := m.GetFilter(); a != nil {
+
 	}
 
 	if m.Pagination != nil {
@@ -602,33 +588,19 @@ func (m *DeleteTuplesRequest) validate(all bool) error {
 
 	var errors []error
 
-	if all {
-		switch v := interface{}(m.GetFilter()).(type) {
-		case interface{ ValidateAll() error }:
-			if err := v.ValidateAll(); err != nil {
-				errors = append(errors, DeleteTuplesRequestValidationError{
-					field:  "Filter",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
-		case interface{ Validate() error }:
-			if err := v.Validate(); err != nil {
-				errors = append(errors, DeleteTuplesRequestValidationError{
-					field:  "Filter",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
+	if m.GetFilter() == nil {
+		err := DeleteTuplesRequestValidationError{
+			field:  "Filter",
+			reason: "value is required",
 		}
-	} else if v, ok := interface{}(m.GetFilter()).(interface{ Validate() error }); ok {
-		if err := v.Validate(); err != nil {
-			return DeleteTuplesRequestValidationError{
-				field:  "Filter",
-				reason: "embedded message failed validation",
-				cause:  err,
-			}
+		if !all {
+			return err
 		}
+		errors = append(errors, err)
+	}
+
+	if a := m.GetFilter(); a != nil {
+
 	}
 
 	if len(errors) > 0 {
diff --git a/api/relations/v0/relation_tuples.proto b/api/relations/v0/relation_tuples.proto
index e45e778..77e01ee 100644
--- a/api/relations/v0/relation_tuples.proto
+++ b/api/relations/v0/relation_tuples.proto
@@ -47,7 +47,7 @@ message CreateTuplesRequest {
 message CreateTuplesResponse {}
 
 message ReadTuplesRequest {
-	RelationTupleFilter filter = 1;
+	RelationTupleFilter filter = 1 [(validate.rules).any.required = true];
 	optional RequestPagination pagination = 2;
 }
 message ReadTuplesResponse {
@@ -56,7 +56,7 @@ message ReadTuplesResponse {
 }
 
 message DeleteTuplesRequest {
-	RelationTupleFilter filter = 1;
+	RelationTupleFilter filter = 1 [(validate.rules).any.required = true];
 }
 message DeleteTuplesResponse {}