diff --git a/.changeset/polite-crews-camp.md b/.changeset/polite-crews-camp.md
new file mode 100644
index 000000000..e68fa0006
--- /dev/null
+++ b/.changeset/polite-crews-camp.md
@@ -0,0 +1,5 @@
+---
+"@effect-app/vue-components": patch
+---
+
+feat: Enhance OmegaForm with union metadata handling and nested meta flattening
diff --git a/.changeset/twelve-moments-pull.md b/.changeset/twelve-moments-pull.md
new file mode 100644
index 000000000..52b731e16
--- /dev/null
+++ b/.changeset/twelve-moments-pull.md
@@ -0,0 +1,5 @@
+---
+"@effect-app/vue-components": minor
+---
+
+chore: enhance metadata handling by adding unionDefaultValues to support default values for tagged schemas
diff --git a/.changeset/twenty-dolls-bathe.md b/.changeset/twenty-dolls-bathe.md
new file mode 100644
index 000000000..245021f23
--- /dev/null
+++ b/.changeset/twenty-dolls-bathe.md
@@ -0,0 +1,5 @@
+---
+"@effect-app/vue-components": patch
+---
+
+fix: Add key to component for reactivity and include translation in schema generation
diff --git a/packages/vue-components/src/components/OmegaForm/OmegaFormStuff.ts b/packages/vue-components/src/components/OmegaForm/OmegaFormStuff.ts
index d9ab6e27b..79712edb7 100644
--- a/packages/vue-components/src/components/OmegaForm/OmegaFormStuff.ts
+++ b/packages/vue-components/src/components/OmegaForm/OmegaFormStuff.ts
@@ -356,6 +356,7 @@ export const createMeta = <T = any>(
 
   if (property?._tag === "TypeLiteral" && "propertySignatures" in property) {
     return createMeta<T>({
+      parent, // Pass parent to maintain the key prefix for nested structures
       meta,
       propertySignatures: property.propertySignatures
     })
@@ -404,7 +405,13 @@ export const createMeta = <T = any>(
               property: p.type,
               meta: { required: isRequired, nullableOrUndefined }
             })
-            acc[key as NestedKeyOf<T>] = parentMeta as FieldMeta
+            // If parentMeta is a MetaRecord (nested structure from ExtendedClass), merge it
+            // Otherwise assign as single FieldMeta
+            if (parentMeta && typeof parentMeta === "object" && !("type" in parentMeta)) {
+              Object.assign(acc, parentMeta)
+            } else {
+              acc[key as NestedKeyOf<T>] = parentMeta as FieldMeta
+            }
           }
 
           // Process each non-null type and merge their metadata
@@ -681,12 +688,37 @@ export const createMeta = <T = any>(
   return acc
 }
 
+// Helper to flatten nested meta structure into dot-notation keys
+const flattenMeta = <T>(meta: MetaRecord<T> | FieldMeta, parentKey: string = ""): MetaRecord<T> => {
+  const result: MetaRecord<T> = {}
+
+  for (const key in meta) {
+    const value = (meta as any)[key]
+    const newKey = parentKey ? `${parentKey}.${key}` : key
+
+    if (value && typeof value === "object" && "type" in value) {
+      result[newKey as DeepKeys<T>] = value as FieldMeta
+    } else if (value && typeof value === "object") {
+      Object.assign(result, flattenMeta<T>(value, newKey))
+    }
+  }
+
+  return result
+}
+
 const metadataFromAst = <From, To>(
   schema: S.Schema<To, From, never>
-): { meta: MetaRecord<To>; defaultValues: Record<string, any> } => {
+): {
+  meta: MetaRecord<To>
+  defaultValues: Record<string, any>
+  unionMeta: Record<string, MetaRecord<To>>
+  unionDefaultValues: Record<string, Record<string, any>>
+} => {
   const ast = schema.ast
   const newMeta: MetaRecord<To> = {}
   const defaultValues: Record<string, any> = {}
+  const unionMeta: Record<string, MetaRecord<To>> = {}
+  const unionDefaultValues: Record<string, Record<string, any>> = {}
 
   if (ast._tag === "Transformation" || ast._tag === "Refinement") {
     return metadataFromAst(S.make(ast.from))
@@ -709,7 +741,7 @@ const metadataFromAst = <From, To>(
       // Extract discriminator values from each union member
       const discriminatorValues: any[] = []
 
-      // Merge metadata from all union members
+      // Store metadata for each union member by its tag value
       for (const memberType of nonNullTypes) {
         if ("propertySignatures" in memberType) {
           // Find the discriminator field (usually _tag)
@@ -717,8 +749,10 @@ const metadataFromAst = <From, To>(
             (p: any) => p.name.toString() === "_tag"
           )
 
+          let tagValue: string | null = null
           if (tagProp && S.AST.isLiteral(tagProp.type)) {
-            discriminatorValues.push(tagProp.type.literal)
+            tagValue = tagProp.type.literal as string
+            discriminatorValues.push(tagValue)
           }
 
           // Create metadata for this member's properties
@@ -726,7 +760,15 @@ const metadataFromAst = <From, To>(
             propertySignatures: memberType.propertySignatures
           })
 
-          // Merge into result
+          // Store per-tag metadata for reactive lookup
+          if (tagValue) {
+            unionMeta[tagValue] = flattenMeta<To>(memberMeta)
+            // Create default values for this tag's schema
+            const memberSchema = S.make(memberType)
+            unionDefaultValues[tagValue] = defaultsValueFromSchema(memberSchema as any)
+          }
+
+          // Merge into result (for backward compatibility)
           Object.assign(newMeta, memberMeta)
         }
       }
@@ -740,7 +782,7 @@ const metadataFromAst = <From, To>(
         } as FieldMeta
       }
 
-      return { meta: newMeta, defaultValues }
+      return { meta: newMeta, defaultValues, unionMeta, unionDefaultValues }
     }
   }
 
@@ -750,7 +792,7 @@ const metadataFromAst = <From, To>(
     })
 
     if (Object.values(meta).every((value) => value && "type" in value)) {
-      return { meta: meta as MetaRecord<To>, defaultValues }
+      return { meta: meta as MetaRecord<To>, defaultValues, unionMeta, unionDefaultValues }
     }
 
     const flattenObject = (
@@ -770,7 +812,7 @@ const metadataFromAst = <From, To>(
     flattenObject(meta)
   }
 
-  return { meta: newMeta, defaultValues }
+  return { meta: newMeta, defaultValues, unionMeta, unionDefaultValues }
 }
 
 export const duplicateSchema = <From, To>(
@@ -784,16 +826,21 @@ export const generateMetaFromSchema = <From, To>(
 ): {
   schema: S.Schema<To, From, never>
   meta: MetaRecord<To>
+  unionMeta: Record<string, MetaRecord<To>>
+  unionDefaultValues: Record<string, Record<string, any>>
 } => {
-  const { meta } = metadataFromAst(schema)
+  const { meta, unionMeta, unionDefaultValues } = metadataFromAst(schema)
 
-  return { schema, meta }
+  return { schema, meta, unionMeta, unionDefaultValues }
 }
 
 export const generateInputStandardSchemaFromFieldMeta = (
-  meta: FieldMeta
+  meta: FieldMeta,
+  trans?: ReturnType<typeof useIntl>["trans"]
 ): StandardSchemaV1<any, any> => {
-  const { trans } = useIntl()
+  if (!trans) {
+    trans = useIntl().trans
+  }
   let schema: S.Schema<any, any, never>
   switch (meta.type) {
     case "string":
@@ -850,7 +897,6 @@ export const generateInputStandardSchemaFromFieldMeta = (
         })
       }
       if (typeof meta.minimum === "number") {
-        console.log("pippocazzo", meta)
         schema = schema.pipe(S.greaterThanOrEqualTo(meta.minimum)).annotations({
           message: () =>
             trans(meta.minimum === 0 ? "validation.number.positive" : "validation.number.min", {
diff --git a/packages/vue-components/src/components/OmegaForm/OmegaInput.vue b/packages/vue-components/src/components/OmegaForm/OmegaInput.vue
index d37f204c0..856451c1a 100644
--- a/packages/vue-components/src/components/OmegaForm/OmegaInput.vue
+++ b/packages/vue-components/src/components/OmegaForm/OmegaInput.vue
@@ -1,6 +1,7 @@
 <template>
   <component
     :is="form.Field"
+    :key="fieldKey"
     :name="name"
     :validators="{
       onChange: schema,
@@ -41,6 +42,7 @@
 >
 import { type DeepKeys } from "@tanstack/vue-form"
 import { computed, inject, type Ref, useAttrs } from "vue"
+import { useIntl } from "../../utils"
 import { type FieldMeta, generateInputStandardSchemaFromFieldMeta, type OmegaInputPropsBase } from "./OmegaFormStuff"
 import OmegaInternalInput from "./OmegaInternalInput.vue"
 import { useErrorLabel } from "./useOmegaForm"
@@ -74,18 +76,35 @@ const getMetaFromArray = inject<Ref<(name: string) => FieldMeta | null> | null>(
 )
 
 const meta = computed(() => {
-  if (getMetaFromArray?.value && getMetaFromArray.value(props.name as DeepKeys<From>)) {
-    return getMetaFromArray.value(propsName.value)
+  const fromArray = getMetaFromArray?.value?.(props.name as DeepKeys<From>)
+  if (fromArray) {
+    return fromArray
   }
-  return props.form.meta[propsName.value]
+  const formMeta = props.form.meta[propsName.value]
+  return formMeta
 })
 
+// Key to force Field re-mount when meta type changes (for TaggedUnion support)
+const fieldKey = computed(() => {
+  const m = meta.value
+  if (!m) return propsName.value
+  // Include type and key constraints in the key so Field re-mounts when validation rules change
+  // Cast to any since not all FieldMeta variants have these properties
+  const fm = m as any
+  return `${propsName.value}-${fm.type}-${fm.minLength ?? ""}-${fm.maxLength ?? ""}-${fm.minimum ?? ""}-${
+    fm.maximum ?? ""
+  }`
+})
+
+// Call useIntl during setup to avoid issues when computed re-evaluates
+const { trans } = useIntl()
+
 const schema = computed(() => {
   if (!meta.value) {
     console.log(props.name, Object.keys(props.form.meta), props.form.meta)
     throw new Error("Meta is undefined")
   }
-  return generateInputStandardSchemaFromFieldMeta(meta.value)
+  return generateInputStandardSchemaFromFieldMeta(meta.value, trans)
 })
 
 const errori18n = useErrorLabel(props.form)
diff --git a/packages/vue-components/src/components/OmegaForm/OmegaTaggedUnion.vue b/packages/vue-components/src/components/OmegaForm/OmegaTaggedUnion.vue
index f0cc7d7df..63e3bd231 100644
--- a/packages/vue-components/src/components/OmegaForm/OmegaTaggedUnion.vue
+++ b/packages/vue-components/src/components/OmegaForm/OmegaTaggedUnion.vue
@@ -6,18 +6,57 @@
   Name extends DeepKeys<From> | undefined = DeepKeys<From>"
 >
 import { type DeepKeys } from "@tanstack/vue-form"
+import { computed, provide, ref, watch } from "vue"
 import { type TaggedUnionOption } from "./InputProps"
 import { type FieldPath } from "./OmegaFormStuff"
 import OmegaTaggedUnionInternal from "./OmegaTaggedUnionInternal.vue"
 import { type useOmegaForm } from "./useOmegaForm"
 
-defineProps<{
+const props = defineProps<{
   name?: Name
   form: ReturnType<typeof useOmegaForm<From, To>>
   type?: "select" | "radio"
   options: TaggedUnionOption<From, Name>[]
   label?: string
 }>()
+
+// Track the current tag value reactively
+const currentTag = ref<string | null>(null)
+
+// Watch the form's _tag field value
+const tagPath = computed(() => props.name ? `${props.name}._tag` : "_tag")
+const formValues = props.form.useStore((state) => state.values)
+watch(
+  () => {
+    const path = tagPath.value
+    // Navigate to the nested value
+    return path.split(".").reduce((acc: any, key) => acc?.[key], formValues.value) as string | null
+  },
+  (newTag) => {
+    currentTag.value = newTag ?? null
+  },
+  { immediate: true }
+)
+
+// Provide tag-specific metadata to all child Input components
+const getMetaFromArray = computed(() => {
+  const tag = currentTag.value
+
+  const getMeta = (path: string) => {
+    if (!tag) return null
+
+    // Get the tag-specific metadata
+    const tagMeta = props.form.unionMeta[tag]
+    if (!tagMeta) return null
+
+    // Look up the meta for this path
+    return tagMeta[path as keyof typeof tagMeta] ?? null
+  }
+
+  return getMeta
+})
+
+provide("getMetaFromArray", getMetaFromArray)
 </script>
 
 <template>
diff --git a/packages/vue-components/src/components/OmegaForm/OmegaTaggedUnionInternal.vue b/packages/vue-components/src/components/OmegaForm/OmegaTaggedUnionInternal.vue
index 969b02790..cbd652c6b 100644
--- a/packages/vue-components/src/components/OmegaForm/OmegaTaggedUnionInternal.vue
+++ b/packages/vue-components/src/components/OmegaForm/OmegaTaggedUnionInternal.vue
@@ -31,8 +31,15 @@ watch(() => props.state, (newTag, oldTag) => {
     props.field.setValue(null as DeepValue<From, Name>)
   }
 
-  if (newTag !== oldTag) {
-    props.form.reset(values.value)
+  if (newTag !== oldTag && newTag) {
+    // Get default values for the new tag to ensure correct types
+    const tagDefaults = (props.form as any).unionDefaultValues?.[newTag as string] ?? {}
+    // Merge: keep _tag from current values, but use tag defaults for other fields
+    const resetValues = {
+      ...tagDefaults,
+      _tag: newTag
+    }
+    props.form.reset(resetValues as any)
     setTimeout(() => {
       props.field.validate("change")
     }, 0)
diff --git a/packages/vue-components/src/components/OmegaForm/useOmegaForm.ts b/packages/vue-components/src/components/OmegaForm/useOmegaForm.ts
index c905ed2cf..a2abdcf98 100644
--- a/packages/vue-components/src/components/OmegaForm/useOmegaForm.ts
+++ b/packages/vue-components/src/components/OmegaForm/useOmegaForm.ts
@@ -217,6 +217,8 @@ export type OmegaConfig<T> = {
 
 export interface OF<From, To> extends OmegaFormApi<From, To> {
   meta: MetaRecord<From>
+  unionMeta: Record<string, MetaRecord<From>>
+  unionDefaultValues: Record<string, Record<string, any>>
   clear: () => void
   i18nNamespace?: string
   ignorePreventCloseEvents?: boolean
@@ -682,7 +684,7 @@ export const useOmegaForm = <
   const standardSchema = S.standardSchemaV1(schema)
   const decode = S.decode(schema)
 
-  const { meta } = generateMetaFromSchema(schema)
+  const { meta, unionMeta, unionDefaultValues } = generateMetaFromSchema(schema)
 
   const persistencyKey = computed(() => {
     if (omegaConfig?.persistency?.id) {
@@ -952,6 +954,8 @@ export const useOmegaForm = <
     i18nNamespace: omegaConfig?.i18nNamespace,
     ignorePreventCloseEvents: omegaConfig?.ignorePreventCloseEvents,
     meta,
+    unionMeta,
+    unionDefaultValues,
     clear,
     handleSubmit: (meta?: Record<string, any>) => {
       const span = api.trace.getSpan(api.context.active())
@@ -961,7 +965,15 @@ export const useOmegaForm = <
     handleSubmitEffect,
     registerField: (field: ComputedRef<{ name: string; label: string; id: string }>) => {
       watch(field, (f) => fieldMap.value.set(f.name, { label: f.label, id: f.id }), { immediate: true })
-      onUnmounted(() => fieldMap.value.delete(field.value.name)) // todo; perhap only when owned (id match)
+      onUnmounted(() => {
+        // Only delete if this component instance still owns the registration (id matches)
+        // This prevents the old component from removing the new component's registration
+        // when Vue re-keys and mounts new before unmounting old
+        const current = fieldMap.value.get(field.value.name)
+        if (current?.id === field.value.id) {
+          fieldMap.value.delete(field.value.name)
+        }
+      })
     }
   })
 
diff --git a/packages/vue-components/stories/OmegaForm/SimpleForm.vue b/packages/vue-components/stories/OmegaForm/SimpleForm.vue
index cc6efa31d..a083da34a 100644
--- a/packages/vue-components/stories/OmegaForm/SimpleForm.vue
+++ b/packages/vue-components/stories/OmegaForm/SimpleForm.vue
@@ -1,47 +1,56 @@
 <template>
-  <form.Form :subscribe="['values', 'isDirty', 'canSubmit']">
-    <template #default="{ subscribedValues: { values, isDirty, canSubmit } }">
-      <div>values: {{ values }} {{ isDirty }} {{ canSubmit }}</div>
-      <form.Input
-        label="asder2"
-        name="categoryId"
+  <stocazzo.Form :subscribe="['values']">
+    <template #default="{ subscribedValues: { values } }">
+      {{ values }}
+      <stocazzo.TaggedUnion
+        label="select"
+        :options="[{
+          title: 'cazzoPippo',
+          value: 'cazzoPippo'
+        }, {
+          title: 'Pippocazzo',
+          value: 'Pippocazzo'
+        }]"
       >
-        <template #default="{ field, label, state, id }">
-          <label :for="id">{{ label }}</label>
-          <input
-            :id="id"
-            v-model="state.value"
-            :name="field.name"
-            style="border: 1px solid red"
-            @change="(e: any) => field.handleChange(e.target.value ?? '')"
-          >
+        <stocazzo.Input name="a.height" />
+        <stocazzo.Input name="a.width" />
+        <template #Pippocazzo>
+          <stocazzo.Input name="a.y" />
         </template>
-      </form.Input>
-      <form.Errors />
-      <v-btn type="submit">
-        submit
-      </v-btn>
+        <template #cazzoPippo>
+          <stocazzo.Input name="a.z" />
+        </template>
+        <v-btn type="submit">
+          ciao
+        </v-btn>
+      </stocazzo.TaggedUnion>
+      <stocazzo.Errors />
     </template>
-  </form.Form>
+  </stocazzo.Form>
 </template>
 
 <script setup lang="ts">
 import { S } from "effect-app"
 import { useOmegaForm } from "../../src/components/OmegaForm"
 
-class schema extends S.ExtendedClass<schema, any>("ListOptionItem")({
-  categoryId: S.String, // TODO
-  priceTableId: S.StringId
-}) {}
-
-// const schema = S.Struct({
-//   categoryId: S.NullOr(S.String), // TODO
-//   priceTableId: S.NullOr(S.StringId)
-// })
-const form = useOmegaForm(schema, {
-  onSubmit: async ({ value }) => {
-    console.log(value)
-  },
-  defaultValues: {}
-})
+const stocazzo = useOmegaForm(
+  S.Union(
+    S.Struct({
+      a: S.Struct({
+        height: S.NonEmptyString100.pipe(S.minLength(10)),
+        width: S.NonEmptyString100.pipe(S.minLength(10)),
+        z: S.NonEmptyString100.pipe(S.minLength(10))
+      }),
+      _tag: S.Literal("cazzoPippo")
+    }),
+    S.Struct({
+      a: S.Struct({
+        height: S.NonNegativeInt.pipe(S.greaterThan(11)),
+        width: S.NonNegativeInt.pipe(S.greaterThan(11)),
+        y: S.NonNegativeInt.pipe(S.greaterThan(11))
+      }),
+      _tag: S.Literal("Pippocazzo")
+    })
+  )
+)
 </script>