diff --git a/go.mod b/go.mod
index 6cd9c64..d8f76e7 100644
--- a/go.mod
+++ b/go.mod
@@ -26,10 +26,10 @@ require (
 	github.com/muesli/ansi v0.0.0-20211031195517-c9f0611b6c70
 	github.com/muesli/reflow v0.3.0
 	github.com/pkg/errors v0.9.1
-	github.com/stretchr/testify v1.9.0
+	github.com/stretchr/testify v1.10.0
 	golang.design/x/clipboard v0.6.2
 	golang.org/x/exp v0.0.0-20230108222341-4b8118a2686a
-	ucl.lmika.dev v0.0.0-20250525023717-3076897eb73e
+	ucl.lmika.dev v0.0.0-20250527114213-41b4fdb00382
 )
 
 require (
@@ -77,4 +77,5 @@ require (
 	golang.org/x/text v0.9.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
+	lmika.dev/pkg/modash v0.0.0-20250216001243-c73e50a0913d // indirect
 )
diff --git a/go.sum b/go.sum
index 462dd4c..2bb8119 100644
--- a/go.sum
+++ b/go.sum
@@ -156,6 +156,7 @@ github.com/sahilm/fuzzy v0.1.0/go.mod h1:VFvziUEIMCrT6A6tw2RFIXPXXmzXbOsSHF0DOI8
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/vmihailenco/msgpack v4.0.4+incompatible h1:dSLoQfGFAo3F6OoNhwUmLwVgaUXK79GlxNBwueZn0xI=
 github.com/vmihailenco/msgpack v4.0.4+incompatible/go.mod h1:fy3FlTQTDXWkZ7Bh6AcGMlsjHatGryHQYUTf1ShIgkk=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
@@ -247,5 +248,13 @@ gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+lmika.dev/pkg/modash v0.0.0-20250216001243-c73e50a0913d h1:x5aMBOkCr4cjJyFmq+qJVUsByfffD9k56HYDx1yZSR4=
+lmika.dev/pkg/modash v0.0.0-20250216001243-c73e50a0913d/go.mod h1:8NDl/yR1eCCEhip9FJlVuMNXIeaztQ0Ks/tizExFcTI=
 ucl.lmika.dev v0.0.0-20250525023717-3076897eb73e h1:N+HzQUunDUvdjAzbSDtHQZVZ1k+XHbVgbNwmc+EKmlQ=
 ucl.lmika.dev v0.0.0-20250525023717-3076897eb73e/go.mod h1:/MMZKm6mOMtnY4I8TYEot4Pc8dKEy+/IAQo1VdpA5EY=
+ucl.lmika.dev v0.0.0-20250527110948-e869e6c9bd4d h1:SlmmY92u7nvPW6xa66n2ZPfCOx90uNp1KkJZ1IDF6K0=
+ucl.lmika.dev v0.0.0-20250527110948-e869e6c9bd4d/go.mod h1:/MMZKm6mOMtnY4I8TYEot4Pc8dKEy+/IAQo1VdpA5EY=
+ucl.lmika.dev v0.0.0-20250527112110-03e6878524a1 h1:e++1/TfwVKdWi1TmO+kfCdO2+lCTKCrh1m4ps0p7UUM=
+ucl.lmika.dev v0.0.0-20250527112110-03e6878524a1/go.mod h1:/MMZKm6mOMtnY4I8TYEot4Pc8dKEy+/IAQo1VdpA5EY=
+ucl.lmika.dev v0.0.0-20250527114213-41b4fdb00382 h1:rDJtNrcKVmEqLep1l2YrodPjCfq+/yl7p8EZUrKW7Aw=
+ucl.lmika.dev v0.0.0-20250527114213-41b4fdb00382/go.mod h1:/MMZKm6mOMtnY4I8TYEot4Pc8dKEy+/IAQo1VdpA5EY=
diff --git a/internal/common/ui/commandctrl/cmdpacks/modav.go b/internal/common/ui/commandctrl/cmdpacks/modav.go
new file mode 100644
index 0000000..977a7c1
--- /dev/null
+++ b/internal/common/ui/commandctrl/cmdpacks/modav.go
@@ -0,0 +1,52 @@
+package cmdpacks
+
+import (
+	"context"
+	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
+	"ucl.lmika.dev/ucl"
+)
+
+type avModule struct {
+}
+
+func (avModule) avTrue(ctx context.Context, args ucl.CallArgs) (_ any, err error) {
+	return attributeValueProxy{value: &types.AttributeValueMemberBOOL{Value: true}}, nil
+}
+
+func (avModule) avFalse(ctx context.Context, args ucl.CallArgs) (_ any, err error) {
+	return attributeValueProxy{value: &types.AttributeValueMemberBOOL{Value: false}}, nil
+}
+
+func (avModule) avNull(ctx context.Context, args ucl.CallArgs) (_ any, err error) {
+	return attributeValueProxy{value: &types.AttributeValueMemberNULL{Value: true}}, nil
+}
+
+func (avModule) avStringSet(ctx context.Context, args ucl.CallArgs) (_ any, err error) {
+	var listable ucl.Listable
+
+	if err := args.Bind(&listable); err != nil {
+		return nil, err
+	}
+
+	ss := make([]string, listable.Len())
+	for i := 0; i < listable.Len(); i++ {
+		item := listable.Index(i)
+		ss[i] = item.String()
+	}
+
+	return attributeValueProxy{value: &types.AttributeValueMemberSS{Value: ss}}, nil
+}
+
+func moduleAttrValue() ucl.Module {
+	m := avModule{}
+
+	return ucl.Module{
+		Name: "av",
+		Builtins: map[string]ucl.BuiltinHandler{
+			"true":       m.avTrue,
+			"false":      m.avFalse,
+			"null":       m.avNull,
+			"string-set": m.avStringSet,
+		},
+	}
+}
diff --git a/internal/common/ui/commandctrl/cmdpacks/modrs.go b/internal/common/ui/commandctrl/cmdpacks/modrs.go
index dc84692..addcaeb 100644
--- a/internal/common/ui/commandctrl/cmdpacks/modrs.go
+++ b/internal/common/ui/commandctrl/cmdpacks/modrs.go
@@ -3,12 +3,12 @@ package cmdpacks
 import (
 	"context"
 	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
+	"github.com/pkg/errors"
 	"lmika.dev/cmd/dynamo-browse/internal/common/ui/commandctrl"
 	"lmika.dev/cmd/dynamo-browse/internal/dynamo-browse/controllers"
 	"lmika.dev/cmd/dynamo-browse/internal/dynamo-browse/models"
 	"lmika.dev/cmd/dynamo-browse/internal/dynamo-browse/models/queryexpr"
 	"lmika.dev/cmd/dynamo-browse/internal/dynamo-browse/services/tables"
-	"github.com/pkg/errors"
 	"time"
 	"ucl.lmika.dev/repl"
 	"ucl.lmika.dev/ucl"
@@ -252,8 +252,12 @@ func (rs *rsModule) rsSet(ctx context.Context, args ucl.CallArgs) (_ any, err er
 		return nil, err
 	}
 
-	// TEMP: attribute is always S
-	if err := q.SetEvalItem(item.item, &types.AttributeValueMemberS{Value: val.String()}); err != nil {
+	vs, err := mapUCLObjectToAttributeType(val)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := q.SetEvalItem(item.item, vs); err != nil {
 		return nil, err
 	}
 	item.resultSet.SetDirty(item.idx, true)
diff --git a/internal/common/ui/commandctrl/cmdpacks/proxy.go b/internal/common/ui/commandctrl/cmdpacks/proxy.go
index 0e61a23..4a72a5d 100644
--- a/internal/common/ui/commandctrl/cmdpacks/proxy.go
+++ b/internal/common/ui/commandctrl/cmdpacks/proxy.go
@@ -3,6 +3,7 @@ package cmdpacks
 import (
 	"fmt"
 	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
+	"github.com/pkg/errors"
 	"lmika.dev/cmd/dynamo-browse/internal/dynamo-browse/models"
 	"maps"
 	"strconv"
@@ -200,6 +201,18 @@ func (tp itemProxy) Each(fn func(k string, v ucl.Object) error) error {
 	return nil
 }
 
+type attributeValueProxy struct {
+	value types.AttributeValue
+}
+
+func (ip attributeValueProxy) String() string {
+	return "attributeValueProxy()"
+}
+
+func (ip attributeValueProxy) Truthy() bool {
+	return ip.value != nil
+}
+
 func convertAttributeValueToUCLObject(attrValue types.AttributeValue) ucl.Object {
 	switch t := attrValue.(type) {
 	case *types.AttributeValueMemberS:
@@ -210,7 +223,58 @@ func convertAttributeValueToUCLObject(attrValue types.AttributeValue) ucl.Object
 			return nil
 		}
 		return ucl.IntObject(i)
+	case *types.AttributeValueMemberBOOL:
+		return ucl.BoolObject(t.Value)
+	case *types.AttributeValueMemberL:
+		vs := make(ucl.ListObject, len(t.Value))
+		for i, v := range t.Value {
+			vs[i] = convertAttributeValueToUCLObject(v)
+		}
+		return &vs
+	case *types.AttributeValueMemberM:
+		hs := make(ucl.HashObject)
+		for k, v := range t.Value {
+			hs[k] = convertAttributeValueToUCLObject(v)
+		}
+		return hs
 	}
-	// TODO: the rest
-	return nil
+
+	return attributeValueProxy{value: attrValue}
+}
+
+func mapUCLObjectToAttributeType(obj ucl.Object) (types.AttributeValue, error) {
+	switch t := obj.(type) {
+	case ucl.StringObject:
+		return &types.AttributeValueMemberS{Value: t.String()}, nil
+	case ucl.IntObject:
+		return &types.AttributeValueMemberN{Value: t.String()}, nil
+	case ucl.BoolObject:
+		return &types.AttributeValueMemberBOOL{Value: t.Truthy()}, nil
+	case ucl.Listable:
+		vals := make([]types.AttributeValue, t.Len())
+		for i := 0; i < t.Len(); i++ {
+			v, err := mapUCLObjectToAttributeType(t.Index(i))
+			if err != nil {
+				return nil, err
+			}
+			vals[i] = v
+		}
+		return &types.AttributeValueMemberL{Value: vals}, nil
+	case ucl.Hashable:
+		vals := make(map[string]types.AttributeValue)
+		if err := t.Each(func(k string, v ucl.Object) error {
+			vv, err := mapUCLObjectToAttributeType(v)
+			if err != nil {
+				return err
+			}
+			vals[k] = vv
+			return nil
+		}); err != nil {
+			return nil, err
+		}
+		return &types.AttributeValueMemberM{Value: vals}, nil
+	case attributeValueProxy:
+		return t.value, nil
+	}
+	return nil, errors.New("unsupported attribute type")
 }
diff --git a/internal/common/ui/commandctrl/cmdpacks/stdcmds.go b/internal/common/ui/commandctrl/cmdpacks/stdcmds.go
index 0bdc0e7..fce0b96 100644
--- a/internal/common/ui/commandctrl/cmdpacks/stdcmds.go
+++ b/internal/common/ui/commandctrl/cmdpacks/stdcmds.go
@@ -3,12 +3,12 @@ package cmdpacks
 import (
 	"context"
 	tea "github.com/charmbracelet/bubbletea"
+	"github.com/pkg/errors"
 	"lmika.dev/cmd/dynamo-browse/internal/common/ui/commandctrl"
 	"lmika.dev/cmd/dynamo-browse/internal/dynamo-browse/controllers"
 	"lmika.dev/cmd/dynamo-browse/internal/dynamo-browse/models"
 	"lmika.dev/cmd/dynamo-browse/internal/dynamo-browse/services"
 	"lmika.dev/cmd/dynamo-browse/internal/dynamo-browse/services/tables"
-	"github.com/pkg/errors"
 	"ucl.lmika.dev/repl"
 	"ucl.lmika.dev/ucl"
 )
@@ -398,6 +398,7 @@ func (sc StandardCommands) InstOptions() []ucl.InstOption {
 		ucl.WithModule(sc.modUI),
 		ucl.WithModule(modulePB(sc.PBProvider)),
 		ucl.WithModule(moduleOpt(sc.SettingsController)),
+		ucl.WithModule(moduleAttrValue()),
 	}
 }