diff --git a/internal/cmd/protovalidate-conformance-go/main.go b/internal/cmd/protovalidate-conformance-go/main.go
index b0b912c..3f21365 100644
--- a/internal/cmd/protovalidate-conformance-go/main.go
+++ b/internal/cmd/protovalidate-conformance-go/main.go
@@ -19,7 +19,6 @@ import (
 	"io"
 	"log"
 	"os"
-	"strings"
 
 	"github.com/bufbuild/protovalidate-go"
 	"github.com/bufbuild/protovalidate-go/internal/gen/buf/validate/conformance/harness"
@@ -27,6 +26,7 @@ import (
 	"google.golang.org/protobuf/reflect/protodesc"
 	"google.golang.org/protobuf/reflect/protoreflect"
 	"google.golang.org/protobuf/reflect/protoregistry"
+	"google.golang.org/protobuf/types/descriptorpb"
 	"google.golang.org/protobuf/types/dynamicpb"
 	"google.golang.org/protobuf/types/known/anypb"
 )
@@ -52,10 +52,33 @@ func main() {
 	}
 }
 
+func buildResolver(fdset *descriptorpb.FileDescriptorSet) (*dynResolver, error) {
+	opts := protodesc.FileOptions{}
+	res := &protoregistry.Files{}
+
+	for _, file := range fdset.GetFile() {
+		if fdesc, err := opts.New(file, res); err != nil {
+			return nil, fmt.Errorf("unable to create file descriptor for %v: %v", file.GetName(), err)
+		} else if err = res.RegisterFile(fdesc); err != nil {
+			return nil, fmt.Errorf("unable to register file descriptor for %v: %v", file.GetName(), err)
+		}
+	}
+
+	resolver := dynamicpb.NewTypes(res)
+	return &dynResolver{
+		seen:     map[protoreflect.FullName]struct{}{},
+		resolver: resolver,
+		opts: proto.UnmarshalOptions{
+			Merge:        true,
+			AllowPartial: true,
+			Resolver:     resolver,
+		},
+	}, nil
+}
+
 func TestConformance(req *harness.TestConformanceRequest) (*harness.TestConformanceResponse, error) {
-	files, err := protodesc.NewFiles(req.GetFdset())
+	resolver, err := buildResolver(req.GetFdset())
 	if err != nil {
-		err = fmt.Errorf("failed to parse file descriptors: %w", err)
 		return nil, err
 	}
 	val, err := protovalidate.New()
@@ -65,25 +88,14 @@ func TestConformance(req *harness.TestConformanceRequest) (*harness.TestConforma
 	}
 	resp := &harness.TestConformanceResponse{Results: map[string]*harness.TestResult{}}
 	for caseName, testCase := range req.GetCases() {
-		resp.Results[caseName] = TestCase(val, files, testCase)
+		resp.Results[caseName] = TestCase(val, resolver, testCase)
 	}
 	return resp, nil
 }
 
-func TestCase(val *protovalidate.Validator, files *protoregistry.Files, testCase *anypb.Any) *harness.TestResult {
-	urlParts := strings.Split(testCase.GetTypeUrl(), "/")
-	fullName := protoreflect.FullName(urlParts[len(urlParts)-1])
-	desc, err := files.FindDescriptorByName(fullName)
+func TestCase(val *protovalidate.Validator, resolver *dynResolver, testCase *anypb.Any) *harness.TestResult {
+	dyn, err := resolver.UnmarshalNew(testCase)
 	if err != nil {
-		return unexpectedErrorResult("unable to find descriptor: %v", err)
-	}
-	msgDesc, ok := desc.(protoreflect.MessageDescriptor)
-	if !ok {
-		return unexpectedErrorResult("expected message descriptor, got %T", desc)
-	}
-
-	dyn := dynamicpb.NewMessage(msgDesc)
-	if err = anypb.UnmarshalTo(testCase, dyn, proto.UnmarshalOptions{}); err != nil {
 		return unexpectedErrorResult("unable to unmarshal test case: %v", err)
 	}
 
@@ -126,3 +138,49 @@ func unexpectedErrorResult(format string, args ...any) *harness.TestResult {
 		},
 	}
 }
+
+type dynResolver struct {
+	seen     map[protoreflect.FullName]struct{}
+	resolver *dynamicpb.Types
+	opts     proto.UnmarshalOptions
+}
+
+func (dr *dynResolver) UnmarshalNew(msg *anypb.Any) (proto.Message, error) {
+	msgTyp, err := dr.resolver.FindMessageByURL(msg.GetTypeUrl())
+	if err != nil {
+		return nil, fmt.Errorf("unable to find message type: %v", err)
+	} else if err = dr.mergeMsgOpts(msgTyp.Descriptor()); err != nil {
+		return nil, err
+	}
+	dyn := msgTyp.New().Interface()
+	return dyn, anypb.UnmarshalTo(msg, dyn, dr.opts)
+}
+
+func (dr *dynResolver) mergeOpts(desc protoreflect.Descriptor) error {
+	return dr.opts.Unmarshal(desc.Options().ProtoReflect().GetUnknown(), desc.Options())
+}
+
+func (dr *dynResolver) mergeMsgOpts(mDesc protoreflect.MessageDescriptor) error {
+	if _, seen := dr.seen[mDesc.FullName()]; seen {
+		return nil
+	}
+	dr.seen[mDesc.FullName()] = struct{}{}
+	if err := dr.mergeOpts(mDesc); err != nil {
+		return fmt.Errorf("failed to merge options for %v: %w", mDesc.FullName(), err)
+	}
+
+	fields := mDesc.Fields()
+	for i, n := 0, fields.Len(); i < n; i++ {
+		field := fields.Get(i)
+		if err := dr.mergeOpts(field); err != nil {
+			return fmt.Errorf("failed to merge options for %v: %w", field.FullName(), err)
+		}
+		if field.Kind() == protoreflect.MessageKind {
+			if err := dr.mergeMsgOpts(field.Message()); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
diff --git a/internal/evaluator/builder.go b/internal/evaluator/builder.go
index 7e4c7e4..e13a09e 100644
--- a/internal/evaluator/builder.go
+++ b/internal/evaluator/builder.go
@@ -15,6 +15,7 @@
 package evaluator
 
 import (
+	"log"
 	"sync"
 	"sync/atomic"
 
@@ -24,6 +25,7 @@ import (
 	"github.com/bufbuild/protovalidate-go/internal/errors"
 	"github.com/bufbuild/protovalidate-go/internal/expression"
 	"github.com/google/cel-go/cel"
+	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/reflect/protoreflect"
 	"google.golang.org/protobuf/types/dynamicpb"
 )
@@ -241,6 +243,7 @@ func (bldr *Builder) buildValue(
 		bldr.processEnumConstraints,
 		bldr.processMapConstraints,
 		bldr.processRepeatedConstraints,
+		bldr.processSharedConstraints,
 	}
 
 	for _, step := range steps {
@@ -251,6 +254,24 @@ func (bldr *Builder) buildValue(
 	return nil
 }
 
+func (bldr *Builder) processSharedConstraints(
+	fdesc protoreflect.FieldDescriptor,
+	_ *validate.FieldConstraints,
+	forItems bool,
+	valEval *value,
+	_ MessageCache,
+) error {
+	if forItems {
+		return nil
+	}
+	proto.RangeExtensions(fdesc.Options(), func(extTyp protoreflect.ExtensionType, rules interface{}) bool {
+		if extTyp.TypeDescriptor().Kind()
+		log.Println(extTyp.TypeDescriptor().FullName(), rules)
+		return true
+	})
+	return nil
+}
+
 func (bldr *Builder) processIgnoreEmpty(
 	fdesc protoreflect.FieldDescriptor,
 	constraints *validate.FieldConstraints,
diff --git a/proto/tests/example/v1/validations.proto b/proto/tests/example/v1/validations.proto
index 8de169d..de4f543 100644
--- a/proto/tests/example/v1/validations.proto
+++ b/proto/tests/example/v1/validations.proto
@@ -171,4 +171,4 @@ message RepeatedItemCel {
     id: "paths.no_space",
     expression: "!this.startsWith(' ')"
   }];
-}
+}
\ No newline at end of file