diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/mod.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/mod.rs
index d5ccc94c4..2488ae4ad 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/mod.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/mod.rs
@@ -5,8 +5,9 @@ mod validation;
 mod wire;
 
 pub(crate) use model::{
-    DirectCodexUserContentPart, DirectCodexUserItem, DirectCodexUserMessageEnvelope,
-    DirectCodexUserMessageItem, DirectCodexUserRole, DirectCodexUserRuntimeRegionPart,
+    DirectCodexUserAttachmentReferencePart, DirectCodexUserContentPart, DirectCodexUserItem,
+    DirectCodexUserMessageEnvelope, DirectCodexUserMessageItem, DirectCodexUserRole,
+    DirectCodexUserRuntimeRegionPart,
 };
 pub(crate) use validation::validate_direct_codex_user_item;
 pub(crate) use wire::{
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/model.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/model.rs
index b46336b66..e739b420b 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/model.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/model.rs
@@ -36,6 +36,23 @@ pub(crate) enum DirectCodexUserContentPart {
     AgcResourceReference { resource_id: String },
     #[serde(rename = "agc_runtime_region_reference")]
     AgcRuntimeRegionReference(DirectCodexUserRuntimeRegionPart),
+    /// Uploaded project attachment kept inline in canonical content.
+    #[serde(rename = "agc_attachment_reference")]
+    AgcAttachmentReference(DirectCodexUserAttachmentReferencePart),
+    #[serde(rename = "agc_image_reference")]
+    AgcImageReference(DirectCodexUserAttachmentReferencePart),
+}
+
+#[derive(Clone, Debug, Deserialize, Serialize, TS)]
+#[serde(rename_all = "camelCase", deny_unknown_fields)]
+#[ts(export, export_to = concat!(env!("CARGO_MANIFEST_DIR"), "/../src/features/project-workspace/generated/"))]
+pub(crate) struct DirectCodexUserAttachmentReferencePart {
+    pub(crate) name: String,
+    pub(crate) media_type: String,
+    #[ts(type = "number")]
+    pub(crate) size: u64,
+    pub(crate) local_path: String,
+    pub(crate) status: String,
 }
 
 #[derive(Clone, Debug, Deserialize, Serialize, TS)]
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/validation.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/validation.rs
index 01f6a6868..50c285729 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/validation.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/validation.rs
@@ -40,6 +40,19 @@ pub(crate) fn validate_direct_codex_user_item(
                 reference_count = reference_count.saturating_add(1);
                 validate_runtime_region_reference(&manifest, reference)?;
             }
+            DirectCodexUserContentPart::AgcAttachmentReference(reference)
+            | DirectCodexUserContentPart::AgcImageReference(reference) => {
+                if reference.name.trim().is_empty() {
+                    return Err("附件缺少文件名".to_string());
+                }
+                if !reference.local_path.trim().is_empty() {
+                    sanitize_attachment_local_path(&reference.local_path)
+                        .ok_or_else(|| "附件项目路径无效".to_string())?;
+                }
+                if !matches!(reference.status.trim(), "imported" | "failed") {
+                    return Err("附件状态无效".to_string());
+                }
+            }
         }
     }
     if reference_count > MAX_DIRECT_CODEX_REFERENCES {
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/wire.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/wire.rs
index 2ab90cc62..c4352f0cf 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/wire.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/wire.rs
@@ -100,6 +100,21 @@ pub(crate) fn direct_codex_user_item_to_wire_input(
                 summary.push(']');
                 summary
             }
+            DirectCodexUserContentPart::AgcAttachmentReference(reference)
+            | DirectCodexUserContentPart::AgcImageReference(reference) => {
+                let mut summary = format!(
+                    "[附件：名称={}；类型={}；大小={} 字节",
+                    reference.name.trim(),
+                    reference.media_type.trim(),
+                    reference.size
+                );
+                if !reference.local_path.trim().is_empty() {
+                    summary.push_str(&format!("；项目路径={}", reference.local_path.trim()));
+                }
+                summary.push_str(&format!("；状态={}", reference.status.trim()));
+                summary.push(']');
+                summary
+            }
         };
         input.push(serde_json::json!({ "type": "text", "text": text }));
     }
@@ -174,4 +189,28 @@ mod tests {
         .expect_err("history item without type must fail");
         assert!(error.contains("缺少 type"), "{error}");
     }
+
+    #[test]
+    fn attachment_and_image_parts_remain_in_canonical_order_when_projected() {
+        let root = tempfile::tempdir().expect("temp project");
+        crate::init_local_game_project_at(root.path(), "wire-test", "wire 投影测试")
+            .expect("init project");
+        let item = json!({
+            "type": "message",
+            "role": "user",
+            "id": "turn-1:user",
+            "content": [
+                {"type": "input_text", "text": "先看"},
+                {"type": "agc_image_reference", "name": "hero.png", "mediaType": "image/png", "size": 12, "localPath": "assets/hero.png", "status": "imported"},
+                {"type": "agc_attachment_reference", "name": "notes.txt", "mediaType": "text/plain", "size": 4, "localPath": "assets/notes.txt", "status": "imported"}
+            ]
+        });
+        let projected = direct_codex_user_item_to_response_item(root.path(), &item)
+            .expect("user response item should project");
+        let content = projected["content"].as_array().expect("content array");
+        assert_eq!(content.len(), 3);
+        assert!(content[0]["text"].as_str().unwrap().contains("先看"));
+        assert!(content[1]["text"].as_str().unwrap().contains("hero.png"));
+        assert!(content[2]["text"].as_str().unwrap().contains("notes.txt"));
+    }
 }
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/user_input.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/user_input.rs
index aa9bbe8f7..1e631cd1f 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/user_input.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/user_input.rs
@@ -31,10 +31,9 @@ pub(crate) fn normalize_direct_client_turn_id(
 pub(crate) async fn chat_with_game_creator_direct_codex(
     project_path: String,
     prompt: String,
-    mut user_item: DirectCodexUserItem,
+    user_item: DirectCodexUserItem,
     creation_type: Option<String>,
     client_turn_id: Option<String>,
-    attachments: Option<Vec<DirectCodexTurnAttachment>>,
 ) -> Result<String, String> {
     let root = Path::new(project_path.trim());
     let turn_id = normalize_direct_client_turn_id(client_turn_id.as_deref())?;
@@ -43,24 +42,7 @@ pub(crate) async fn chat_with_game_creator_direct_codex(
         redact_agent_runtime_error(root, &format!("恢复上一轮陶泥儿整包事务失败：{error}"), 500)
     })?;
     let turn_emitter = DirectGameCreatorTurnUpdateEmitter::new(root, turn_id.clone());
-    let mut audit = DirectCodexTurnAudit::start(
-        root,
-        &turn_id,
-        &prompt,
-        attachments.as_deref().unwrap_or_default(),
-    );
-    let attachments = attachments.unwrap_or_default();
-    if !attachments.is_empty() {
-        let attachment_context =
-            render_direct_codex_user_prompt("", &attachments).map_err(|error| {
-                audit.finish(false);
-                error
-            })?;
-        let DirectCodexUserItem::Message(message) = &mut user_item;
-        message.content.push(DirectCodexUserContentPart::InputText {
-            text: attachment_context,
-        });
-    }
+    let mut audit = DirectCodexTurnAudit::start(root, &turn_id, &prompt, &[]);
     validate_direct_codex_user_item(root, &user_item).map_err(|error| {
         audit.finish(false);
         error
diff --git a/apps/ai-game-creator-shell/src/App.tsx b/apps/ai-game-creator-shell/src/App.tsx
index b2a05ae88..937e48ec6 100644
--- a/apps/ai-game-creator-shell/src/App.tsx
+++ b/apps/ai-game-creator-shell/src/App.tsx
@@ -893,8 +893,7 @@ export function App({
 
   /**
    * 输入盒待发送附件（direct-codex 回合附件）：上传成功后先生成 chip，随下次提交一起
-   * 交给 `chat_with_game_creator_direct_codex` 的 `attachments`。附件只存在于前端状态，
-   * 提交后即清空——后端协议不变。
+   * 转换为 canonical user item 的 `content[]`。附件只存在于前端待发状态，提交后即清空。
    */
   const [chatAttachments, setChatAttachments] = useState<
     DirectCodexTurnAttachment[]
@@ -7035,12 +7034,32 @@ export function App({
       if (directProjectPath && directProjectId && directInvoke) {
         const clientTurnId =
           directConversationTurnId ?? createDirectCodexConversationTurnId();
-        const effectiveUserItem =
+        const baseUserItem =
           userItem ??
           chatComposerDraftToDirectCodexUserItem(
             { text: prompt, references: references ?? [], content: [] },
             directCodexConversationMessageId(clientTurnId, 'user'),
           );
+        const effectiveUserItem = attachments?.length
+          ? {
+              ...baseUserItem,
+              content: [
+                ...baseUserItem.content,
+                ...attachments.map((attachment) => ({
+                  type: attachment.mediaType.toLowerCase().startsWith('image/')
+                    ? ('agc_image_reference' as const)
+                    : ('agc_attachment_reference' as const),
+                  name: attachment.name,
+                  mediaType: attachment.mediaType,
+                  size: attachment.size ?? 0,
+                  localPath: attachment.localPath ?? '',
+                  status:
+                    attachment.status ??
+                    (attachment.localPath ? 'imported' : 'failed'),
+                })),
+              ],
+            }
+          : baseUserItem;
         if (
           !directPolicyChecked &&
           projectConversationWriteConfirmedRef.current !== directProjectPath
@@ -7181,7 +7200,6 @@ export function App({
             prompt: string;
             clientTurnId: string;
             creationType?: HomeCreationType;
-            attachments?: DirectCodexTurnAttachment[];
             userItem: ReturnType<typeof chatComposerDraftToDirectCodexUserItem>;
           } = {
             projectPath: directProjectPath,
@@ -7192,9 +7210,6 @@ export function App({
           if (creationType) {
             directTurnInput.creationType = creationType;
           }
-          if (attachments?.length) {
-            directTurnInput.attachments = attachments;
-          }
           directTurnInput.userItem = effectiveUserItem;
           const reply = await withDirectCodexSessionRefresh(() => {
             // 每次调用都会新建 Rust 事件流；续期重试需重新接收同一回合的进度。
@@ -12595,6 +12610,20 @@ export function App({
     content?: DirectCodexUserContentPart[];
   }) {
     const clientTurnId = createDirectCodexConversationTurnId();
+    const attachmentContent: DirectCodexUserContentPart[] = (
+      input.attachments ?? []
+    ).map((attachment) => ({
+      type: attachment.mediaType.toLowerCase().startsWith('image/')
+        ? ('agc_image_reference' as const)
+        : ('agc_attachment_reference' as const),
+      name: attachment.name,
+      mediaType: attachment.mediaType,
+      size: attachment.size ?? 0,
+      localPath: attachment.localPath ?? '',
+      status:
+        attachment.status ?? (attachment.localPath ? 'imported' : 'failed'),
+    }));
+    const content = [...(input.content ?? []), ...attachmentContent];
     supervisorChatShouldFollowLatestRef.current = true;
     setMessages((current) => [
       ...current,
@@ -12609,16 +12638,18 @@ export function App({
     void executeChatAgentReply({
       prompt: input.prompt,
       clientTurnId,
-      attachments: input.attachments?.length ? input.attachments : undefined,
       references: input.references,
       userItem: chatComposerDraftToDirectCodexUserItem(
         {
           text: input.prompt,
           references: input.references ?? [],
-          content: input.content ?? [],
+          content,
         },
         directCodexConversationMessageId(clientTurnId, 'user'),
       ),
+      // DirectProject 的附件已经是 canonical content part；不能再作为 sidecar
+      // 传给 Rust，否则会重复追加。
+      attachments: undefined,
     });
   }
 
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserAttachmentReferencePart.ts b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserAttachmentReferencePart.ts
new file mode 100644
index 000000000..7394ae07d
--- /dev/null
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserAttachmentReferencePart.ts
@@ -0,0 +1,9 @@
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+export type DirectCodexUserAttachmentReferencePart = {
+  name: string;
+  mediaType: string;
+  size: number;
+  localPath: string;
+  status: string;
+};
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserContentPart.ts b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserContentPart.ts
index 10c4e0f5a..c3b7b0ea1 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserContentPart.ts
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserContentPart.ts
@@ -1,5 +1,5 @@
-// This file is generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
-
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { DirectCodexUserAttachmentReferencePart } from './DirectCodexUserAttachmentReferencePart';
 import type { DirectCodexUserRuntimeRegionPart } from './DirectCodexUserRuntimeRegionPart';
 
 export type DirectCodexUserContentPart =
@@ -7,4 +7,8 @@ export type DirectCodexUserContentPart =
   | { type: 'agc_resource_reference'; resourceId: string }
   | ({
       type: 'agc_runtime_region_reference';
-    } & DirectCodexUserRuntimeRegionPart);
+    } & DirectCodexUserRuntimeRegionPart)
+  | ({
+      type: 'agc_attachment_reference';
+    } & DirectCodexUserAttachmentReferencePart)
+  | ({ type: 'agc_image_reference' } & DirectCodexUserAttachmentReferencePart);
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserItem.ts b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserItem.ts
index 4c9ea8ca3..aa1ee88dd 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserItem.ts
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserItem.ts
@@ -1,5 +1,9 @@
-// This file is generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
-
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
 import type { DirectCodexUserMessageItem } from './DirectCodexUserMessageItem';
 
-export type DirectCodexUserItem = DirectCodexUserMessageItem;
+/**
+ * DirectProject 本轮 user input 的唯一结构化入口。
+ */
+export type DirectCodexUserItem = {
+  type: 'message';
+} & DirectCodexUserMessageItem;
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserMessageEnvelope.ts b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserMessageEnvelope.ts
new file mode 100644
index 000000000..97e0b0dae
--- /dev/null
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserMessageEnvelope.ts
@@ -0,0 +1,4 @@
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { DirectCodexUserItem } from './DirectCodexUserItem';
+
+export type DirectCodexUserMessageEnvelope = { item: DirectCodexUserItem };
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserMessageItem.ts b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserMessageItem.ts
index f7447dc5d..a1101c8cb 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserMessageItem.ts
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserMessageItem.ts
@@ -1,11 +1,9 @@
-// This file is generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
-
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
 import type { DirectCodexUserContentPart } from './DirectCodexUserContentPart';
 import type { DirectCodexUserRole } from './DirectCodexUserRole';
 
 export type DirectCodexUserMessageItem = {
-  type: 'message';
   role: DirectCodexUserRole;
-  content: DirectCodexUserContentPart[];
+  content: Array<DirectCodexUserContentPart>;
   id: string;
 };
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserRole.ts b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserRole.ts
index e1dc59c59..0c2540122 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserRole.ts
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserRole.ts
@@ -1,3 +1,3 @@
-// This file is generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
 
 export type DirectCodexUserRole = 'user';
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserRuntimeRegionPart.ts b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserRuntimeRegionPart.ts
index 296c0d19a..b134fb7bc 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserRuntimeRegionPart.ts
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/generated/DirectCodexUserRuntimeRegionPart.ts
@@ -1,13 +1,13 @@
-// This file is generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
 
 export type DirectCodexUserRuntimeRegionPart = {
   label: string;
-  runId?: string;
-  versionId?: string;
-  elementTag?: string;
-  elementRole?: string;
-  text?: string;
-  width?: number;
-  height?: number;
-  resourceIds: string[];
+  runId: string | null;
+  versionId: string | null;
+  elementTag: string | null;
+  elementRole: string | null;
+  text: string | null;
+  width: number | null;
+  height: number | null;
+  resourceIds: Array<string>;
 };
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/generated/index.ts b/apps/ai-game-creator-shell/src/features/project-workspace/generated/index.ts
index f1012a4c5..aff993c0d 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/generated/index.ts
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/generated/index.ts
@@ -1,5 +1,7 @@
 export type { DirectCodexUserContentPart } from './DirectCodexUserContentPart';
+export type { DirectCodexUserAttachmentReferencePart } from './DirectCodexUserAttachmentReferencePart';
 export type { DirectCodexUserItem } from './DirectCodexUserItem';
 export type { DirectCodexUserMessageItem } from './DirectCodexUserMessageItem';
 export type { DirectCodexUserRole } from './DirectCodexUserRole';
 export type { DirectCodexUserRuntimeRegionPart } from './DirectCodexUserRuntimeRegionPart';
+export type { DirectCodexUserMessageEnvelope } from './DirectCodexUserMessageEnvelope';
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/resourceReferences.ts b/apps/ai-game-creator-shell/src/features/project-workspace/resourceReferences.ts
index c6e6959c8..72f46c677 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/resourceReferences.ts
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/resourceReferences.ts
@@ -13,7 +13,6 @@ import {
 import type {
   DirectCodexUserContentPart,
   DirectCodexUserItem,
-  DirectCodexUserMessageItem,
 } from './generated';
 
 export type ResourceReferenceSource =
@@ -103,13 +102,13 @@ export function chatReferenceToContentPart(
   return {
     type: 'agc_runtime_region_reference',
     label: reference.label,
-    runId: reference.runId,
-    versionId: reference.versionId,
-    elementTag: reference.elementTag,
-    elementRole: reference.elementRole,
-    text: reference.text,
-    width: reference.width,
-    height: reference.height,
+    runId: reference.runId ?? null,
+    versionId: reference.versionId ?? null,
+    elementTag: reference.elementTag ?? null,
+    elementRole: reference.elementRole ?? null,
+    text: reference.text ?? null,
+    width: reference.width ?? null,
+    height: reference.height ?? null,
     resourceIds: reference.resourceIds,
   };
 }
@@ -126,7 +125,7 @@ export function chatComposerDraftToDirectCodexUserItem(
     role: 'user',
     content,
     id,
-  } satisfies DirectCodexUserMessageItem;
+  } satisfies DirectCodexUserItem;
 }
 
 export function resourceDisplayName(asset: GameCreationAppAssetManifestEntry) {
diff --git a/docs/project-memory/plans/【实施计划】DirectProject用户ResponseItem输入-2026-09-15.md b/docs/project-memory/plans/【实施计划】DirectProject用户ResponseItem输入-2026-09-15.md
index dac2a7297..51b9ea7b8 100644
--- a/docs/project-memory/plans/【实施计划】DirectProject用户ResponseItem输入-2026-09-15.md
+++ b/docs/project-memory/plans/【实施计划】DirectProject用户ResponseItem输入-2026-09-15.md
@@ -9,7 +9,7 @@
 ## 修改边界
 
 - 允许修改：AGC 壳 Rust agent 输入合同、DirectProject 历史适配、前端聊天引用模型、ts-rs 生成配置、当前聊天素材文档。
-- 明确不修改：assistant 返回协议、工具 activity、附件/图片 DTO 协议、SpacetimeDB、HTTP API；仅补齐既有 sidecar 在 DirectProject prompt 的消费。
+- 明确不修改：assistant 返回协议、工具 activity、附件/图片上传 DTO、SpacetimeDB、HTTP API；上传 DTO 仅在入口转换为 canonical `content[]`，不再以 sidecar 文本追加。
 
 ## 实现顺序
 
diff --git a/docs/project-memory/plans/【里程碑】DirectProject用户ResponseItem输入-2026-09-15.md b/docs/project-memory/plans/【里程碑】DirectProject用户ResponseItem输入-2026-09-15.md
index 392505040..963ad4791 100644
--- a/docs/project-memory/plans/【里程碑】DirectProject用户ResponseItem输入-2026-09-15.md
+++ b/docs/project-memory/plans/【里程碑】DirectProject用户ResponseItem输入-2026-09-15.md
@@ -19,13 +19,13 @@
 - `agc_runtime_region_reference` 保留运行区域语义摘要。
 - Rust 在持久化前完成白名单、manifest 与路径校验。
 - 现有标准 `response_item` 原样兼容；legacy conversation 行不提供 fallback。
-- 保持 assistant 返回、工具 activity、附件/图片协议不变；沿用 sidecar DTO 将附件与图片路径映射纳入 DirectProject prompt。
+- 保持 assistant 返回、工具 activity 与上传 DTO 不变；但 DirectProject canonical user item 不再保存附件 sidecar，附件和图片必须作为 `content[]` 中按顺序排列的 `agc_attachment_reference` / `agc_image_reference`。
 
 ## 不在范围内
 
 - assistant item 前端投影或 Tauri 返回值改造。
 - 工具 item、reasoning、file change、MCP item 的 UI 模型化。
-- 附件/图片 content part（不新增 content-part，继续消费现有 sidecar DTO）。
+- 附件/图片 content part：本里程碑明确新增并生成绑定；上传 DTO 只作为输入适配，不作为历史事实源。
 - SpacetimeDB schema 或 HTTP API 变更。
 
 ## 依赖与前置条件
@@ -42,7 +42,7 @@
 - [x] 未知 part、失效资源或非法路径在持久化前失败关闭。
 - [x] canonical item 以 `response_item` 写入历史，标准旧 item 原样可读。
 - [x] Codex wire input 不含 AGC 私有 part，且顺序与 canonical content 一致。
-- [x] assistant、附件和工具链路行为无变化；附件-only 输入也能进入 DirectProject prompt。
+- [x] assistant、附件和工具链路行为无变化；附件与图片按 content 顺序内联，附件-only 输入也能进入 DirectProject prompt。
 
 ## 证据要求