diff --git a/clients/kotlin/src/main/kotlin/com/microsoft/agenthostprotocol/generated/State.generated.kt b/clients/kotlin/src/main/kotlin/com/microsoft/agenthostprotocol/generated/State.generated.kt
index ac1ee800..840af62b 100644
--- a/clients/kotlin/src/main/kotlin/com/microsoft/agenthostprotocol/generated/State.generated.kt
+++ b/clients/kotlin/src/main/kotlin/com/microsoft/agenthostprotocol/generated/State.generated.kt
@@ -2416,7 +2416,7 @@ data class ContentRef(
 )
 
 @Serializable
-data class ResourceReponsePart(
+data class ResourceResponsePart(
     /**
      * Content URI
      */
@@ -4773,7 +4773,7 @@ sealed interface ResponsePart
 @JvmInline
 value class ResponsePartMarkdown(val value: MarkdownResponsePart) : ResponsePart
 @JvmInline
-value class ResponsePartContentRef(val value: ResourceReponsePart) : ResponsePart
+value class ResponsePartContentRef(val value: ResourceResponsePart) : ResponsePart
 @JvmInline
 value class ResponsePartToolCall(val value: ToolCallResponsePart) : ResponsePart
 @JvmInline
@@ -4807,7 +4807,7 @@ internal object ResponsePartSerializer : KSerializer<ResponsePart> {
             ?: return ResponsePartUnknown(obj)
         return when (discriminant) {
             "markdown" -> ResponsePartMarkdown(input.json.decodeFromJsonElement(MarkdownResponsePart.serializer(), element))
-            "contentRef" -> ResponsePartContentRef(input.json.decodeFromJsonElement(ResourceReponsePart.serializer(), element))
+            "contentRef" -> ResponsePartContentRef(input.json.decodeFromJsonElement(ResourceResponsePart.serializer(), element))
             "toolCall" -> ResponsePartToolCall(input.json.decodeFromJsonElement(ToolCallResponsePart.serializer(), element))
             "reasoning" -> ResponsePartReasoning(input.json.decodeFromJsonElement(ReasoningResponsePart.serializer(), element))
             "systemNotification" -> ResponsePartSystemNotification(input.json.decodeFromJsonElement(SystemNotificationResponsePart.serializer(), element))
@@ -4821,7 +4821,7 @@ internal object ResponsePartSerializer : KSerializer<ResponsePart> {
             ?: error("ResponsePart can only be serialized to JSON")
         val element: JsonElement = when (value) {
             is ResponsePartMarkdown -> output.json.encodeToJsonElement(MarkdownResponsePart.serializer(), value.value)
-            is ResponsePartContentRef -> output.json.encodeToJsonElement(ResourceReponsePart.serializer(), value.value)
+            is ResponsePartContentRef -> output.json.encodeToJsonElement(ResourceResponsePart.serializer(), value.value)
             is ResponsePartToolCall -> output.json.encodeToJsonElement(ToolCallResponsePart.serializer(), value.value)
             is ResponsePartReasoning -> output.json.encodeToJsonElement(ReasoningResponsePart.serializer(), value.value)
             is ResponsePartSystemNotification -> output.json.encodeToJsonElement(SystemNotificationResponsePart.serializer(), value.value)
diff --git a/clients/swift/AHPApp/AHPApp/Views/ResponsePartView.swift b/clients/swift/AHPApp/AHPApp/Views/ResponsePartView.swift
index fd59358d..21938d07 100644
--- a/clients/swift/AHPApp/AHPApp/Views/ResponsePartView.swift
+++ b/clients/swift/AHPApp/AHPApp/Views/ResponsePartView.swift
@@ -733,7 +733,7 @@ struct TerminalToolResultView: View {
 // MARK: - ContentRefView
 
 struct ContentRefView: View {
-    let ref: ResourceReponsePart
+    let ref: ResourceResponsePart
 
     var body: some View {
         HStack {
@@ -892,7 +892,7 @@ struct ContentRefView: View {
 
             // Content Ref
             Text("Content Ref").font(.caption.bold()).foregroundStyle(.secondary)
-            ContentRefView(ref: ResourceReponsePart(
+            ContentRefView(ref: ResourceResponsePart(
                 uri: "file:///Users/me/project/README.md",
                 contentType: "text/markdown",
                 kind: .contentRef
diff --git a/clients/swift/AgentHostProtocol/Sources/AgentHostProtocol/Generated/State.generated.swift b/clients/swift/AgentHostProtocol/Sources/AgentHostProtocol/Generated/State.generated.swift
index 1157a4e4..4c3adb9b 100644
--- a/clients/swift/AgentHostProtocol/Sources/AgentHostProtocol/Generated/State.generated.swift
+++ b/clients/swift/AgentHostProtocol/Sources/AgentHostProtocol/Generated/State.generated.swift
@@ -2414,7 +2414,7 @@ public struct ContentRef: Codable, Sendable {
     }
 }
 
-public struct ResourceReponsePart: Codable, Sendable {
+public struct ResourceResponsePart: Codable, Sendable {
     /// Content URI
     public var uri: String
     /// Approximate size in bytes
@@ -5330,7 +5330,7 @@ public enum ChatOrigin: Codable, Sendable {
 
 public enum ResponsePart: Codable, Sendable {
     case markdown(MarkdownResponsePart)
-    case contentRef(ResourceReponsePart)
+    case contentRef(ResourceResponsePart)
     case toolCall(ToolCallResponsePart)
     case reasoning(ReasoningResponsePart)
     case systemNotification(SystemNotificationResponsePart)
@@ -5350,7 +5350,7 @@ public enum ResponsePart: Codable, Sendable {
         case "markdown":
             self = .markdown(try MarkdownResponsePart(from: decoder))
         case "contentRef":
-            self = .contentRef(try ResourceReponsePart(from: decoder))
+            self = .contentRef(try ResourceResponsePart(from: decoder))
         case "toolCall":
             self = .toolCall(try ToolCallResponsePart(from: decoder))
         case "reasoning":
diff --git a/docs/.changes/20260730-resource-response-part-rename.json b/docs/.changes/20260730-resource-response-part-rename.json
new file mode 100644
index 00000000..9d561559
--- /dev/null
+++ b/docs/.changes/20260730-resource-response-part-rename.json
@@ -0,0 +1,4 @@
+{
+  "type": "changed",
+  "message": "Renamed `ResourceReponsePart` to `ResourceResponsePart`, correcting a misspelling. The Rust and Go clients already exposed the corrected name via generator-level renames; the TypeScript, Kotlin and Swift clients previously carried the typo, so the type now has one consistent name across all five clients."
+}
diff --git a/docs/guide/state-model.md b/docs/guide/state-model.md
index 642952e7..2f55c06c 100644
--- a/docs/guide/state-model.md
+++ b/docs/guide/state-model.md
@@ -323,7 +323,7 @@ ToolCallResponsePart {
 }
 
 // Response-part wrapper around a large content reference
-ResourceReponsePart {
+ResourceResponsePart {
   kind: 'contentRef'
   uri: string
   sizeHint?: number
diff --git a/schema/actions.schema.json b/schema/actions.schema.json
index 33ab571e..f5d965f1 100644
--- a/schema/actions.schema.json
+++ b/schema/actions.schema.json
@@ -5475,7 +5475,7 @@
         "content"
       ]
     },
-    "ResourceReponsePart": {
+    "ResourceResponsePart": {
       "type": "object",
       "description": "A content part that's a reference to large content stored outside the state tree.",
       "properties": {
@@ -7376,7 +7376,7 @@
           "$ref": "#/$defs/MarkdownResponsePart"
         },
         {
-          "$ref": "#/$defs/ResourceReponsePart"
+          "$ref": "#/$defs/ResourceResponsePart"
         },
         {
           "$ref": "#/$defs/ToolCallResponsePart"
diff --git a/schema/commands.schema.json b/schema/commands.schema.json
index cae4edaf..9ab17160 100644
--- a/schema/commands.schema.json
+++ b/schema/commands.schema.json
@@ -4644,7 +4644,7 @@
         "content"
       ]
     },
-    "ResourceReponsePart": {
+    "ResourceResponsePart": {
       "type": "object",
       "description": "A content part that's a reference to large content stored outside the state tree.",
       "properties": {
@@ -9084,7 +9084,7 @@
           "$ref": "#/$defs/MarkdownResponsePart"
         },
         {
-          "$ref": "#/$defs/ResourceReponsePart"
+          "$ref": "#/$defs/ResourceResponsePart"
         },
         {
           "$ref": "#/$defs/ToolCallResponsePart"
diff --git a/schema/errors.schema.json b/schema/errors.schema.json
index 462251d4..77945879 100644
--- a/schema/errors.schema.json
+++ b/schema/errors.schema.json
@@ -3380,7 +3380,7 @@
         "content"
       ]
     },
-    "ResourceReponsePart": {
+    "ResourceResponsePart": {
       "type": "object",
       "description": "A content part that's a reference to large content stored outside the state tree.",
       "properties": {
@@ -6684,7 +6684,7 @@
           "$ref": "#/$defs/MarkdownResponsePart"
         },
         {
-          "$ref": "#/$defs/ResourceReponsePart"
+          "$ref": "#/$defs/ResourceResponsePart"
         },
         {
           "$ref": "#/$defs/ToolCallResponsePart"
diff --git a/schema/notifications.schema.json b/schema/notifications.schema.json
index 419f9a11..e95f38c8 100644
--- a/schema/notifications.schema.json
+++ b/schema/notifications.schema.json
@@ -3543,7 +3543,7 @@
         "content"
       ]
     },
-    "ResourceReponsePart": {
+    "ResourceResponsePart": {
       "type": "object",
       "description": "A content part that's a reference to large content stored outside the state tree.",
       "properties": {
@@ -5502,7 +5502,7 @@
           "$ref": "#/$defs/MarkdownResponsePart"
         },
         {
-          "$ref": "#/$defs/ResourceReponsePart"
+          "$ref": "#/$defs/ResourceResponsePart"
         },
         {
           "$ref": "#/$defs/ToolCallResponsePart"
diff --git a/schema/state.schema.json b/schema/state.schema.json
index a698f16e..07be2112 100644
--- a/schema/state.schema.json
+++ b/schema/state.schema.json
@@ -3291,7 +3291,7 @@
         "content"
       ]
     },
-    "ResourceReponsePart": {
+    "ResourceResponsePart": {
       "type": "object",
       "description": "A content part that's a reference to large content stored outside the state tree.",
       "properties": {
@@ -5192,7 +5192,7 @@
           "$ref": "#/$defs/MarkdownResponsePart"
         },
         {
-          "$ref": "#/$defs/ResourceReponsePart"
+          "$ref": "#/$defs/ResourceResponsePart"
         },
         {
           "$ref": "#/$defs/ToolCallResponsePart"
diff --git a/scripts/generate-go.ts b/scripts/generate-go.ts
index 25753a2e..34e8eabd 100644
--- a/scripts/generate-go.ts
+++ b/scripts/generate-go.ts
@@ -758,7 +758,7 @@ const STATE_STRUCTS: { name: string; omitDiscriminants?: boolean; goName?: strin
   { name: 'MessageChatAttachment' },
   { name: 'MarkdownResponsePart' },
   { name: 'ContentRef' },
-  { name: 'ResourceReponsePart', goName: 'ResourceResponsePart' },
+  { name: 'ResourceResponsePart' },
   { name: 'ToolCallResponsePart' },
   { name: 'ReasoningResponsePart' },
   { name: 'SystemNotificationResponsePart' },
diff --git a/scripts/generate-kotlin.ts b/scripts/generate-kotlin.ts
index e86113b7..81a192de 100644
--- a/scripts/generate-kotlin.ts
+++ b/scripts/generate-kotlin.ts
@@ -929,7 +929,7 @@ const STATE_STRUCTS = [
   'SimpleMessageAttachment', 'MessageEmbeddedResourceAttachment', 'MessageResourceAttachment',
   'MessageAnnotationsAttachment', 'MessageChatAttachment',
   'MarkdownResponsePart', 'ContentRef',
-  'ResourceReponsePart', 'ToolCallResponsePart', 'ReasoningResponsePart',
+  'ResourceResponsePart', 'ToolCallResponsePart', 'ReasoningResponsePart',
   'SystemNotificationResponsePart', 'InputRequestResponsePart',
   'ToolCallResult', 'ToolCallStreamingState',
   'ToolCallPendingConfirmationState', 'ToolCallRunningState', 'ToolCallAuthRequiredState',
@@ -965,7 +965,7 @@ const RESPONSE_PART_UNION: UnionConfig = {
   discriminantField: 'kind',
   variants: [
     { caseName: 'Markdown', structName: 'MarkdownResponsePart', discriminantValue: 'markdown' },
-    { caseName: 'ContentRef', structName: 'ResourceReponsePart', discriminantValue: 'contentRef' },
+    { caseName: 'ContentRef', structName: 'ResourceResponsePart', discriminantValue: 'contentRef' },
     { caseName: 'ToolCall', structName: 'ToolCallResponsePart', discriminantValue: 'toolCall' },
     { caseName: 'Reasoning', structName: 'ReasoningResponsePart', discriminantValue: 'reasoning' },
     { caseName: 'SystemNotification', structName: 'SystemNotificationResponsePart', discriminantValue: 'systemNotification' },
diff --git a/scripts/generate-rust.ts b/scripts/generate-rust.ts
index 7fb9044d..2903226e 100644
--- a/scripts/generate-rust.ts
+++ b/scripts/generate-rust.ts
@@ -741,7 +741,7 @@ const STATE_STRUCTS: { name: string; omitDiscriminants?: boolean; rustName?: str
   { name: 'MessageChatAttachment', omitDiscriminants: true },
   { name: 'MarkdownResponsePart', omitDiscriminants: true },
   { name: 'ContentRef' },
-  { name: 'ResourceReponsePart', omitDiscriminants: true, rustName: 'ResourceResponsePart' },
+  { name: 'ResourceResponsePart', omitDiscriminants: true },
   { name: 'ToolCallResponsePart', omitDiscriminants: true },
   { name: 'ReasoningResponsePart', omitDiscriminants: true },
   { name: 'SystemNotificationResponsePart', omitDiscriminants: true },
diff --git a/scripts/generate-swift.ts b/scripts/generate-swift.ts
index 086f8659..6b486893 100644
--- a/scripts/generate-swift.ts
+++ b/scripts/generate-swift.ts
@@ -638,7 +638,7 @@ const STATE_STRUCTS = [
   'SimpleMessageAttachment', 'MessageEmbeddedResourceAttachment', 'MessageResourceAttachment',
   'MessageAnnotationsAttachment', 'MessageChatAttachment',
   'MarkdownResponsePart', 'ContentRef',
-  'ResourceReponsePart', 'ToolCallResponsePart', 'ReasoningResponsePart',
+  'ResourceResponsePart', 'ToolCallResponsePart', 'ReasoningResponsePart',
   'SystemNotificationResponsePart', 'InputRequestResponsePart',
   'ToolCallResult', 'ToolCallStreamingState',
   'ToolCallPendingConfirmationState', 'ToolCallRunningState', 'ToolCallAuthRequiredState',
@@ -679,7 +679,7 @@ const RESPONSE_PART_UNION: UnionConfig = {
   allowUnknown: true,
   variants: [
     { caseName: 'markdown', structName: 'MarkdownResponsePart', discriminantValue: 'markdown' },
-    { caseName: 'contentRef', structName: 'ResourceReponsePart', discriminantValue: 'contentRef' },
+    { caseName: 'contentRef', structName: 'ResourceResponsePart', discriminantValue: 'contentRef' },
     { caseName: 'toolCall', structName: 'ToolCallResponsePart', discriminantValue: 'toolCall' },
     { caseName: 'reasoning', structName: 'ReasoningResponsePart', discriminantValue: 'reasoning' },
     { caseName: 'systemNotification', structName: 'SystemNotificationResponsePart', discriminantValue: 'systemNotification' },
diff --git a/types/channels-chat/state.ts b/types/channels-chat/state.ts
index 72644317..8e107a23 100644
--- a/types/channels-chat/state.ts
+++ b/types/channels-chat/state.ts
@@ -881,7 +881,7 @@ export interface MarkdownResponsePart {
  *
  * @category Response Parts
  */
-export interface ResourceReponsePart extends ContentRef {
+export interface ResourceResponsePart extends ContentRef {
   /** Discriminant */
   kind: ResponsePartKind.ContentRef;
 }
@@ -921,7 +921,7 @@ export interface ReasoningResponsePart {
  */
 export type ResponsePart =
   | MarkdownResponsePart
-  | ResourceReponsePart
+  | ResourceResponsePart
   | ToolCallResponsePart
   | ReasoningResponsePart
   | SystemNotificationResponsePart