diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/ProjectSupervisorView.tsx b/apps/ai-game-creator-shell/src/features/project-workspace/ProjectSupervisorView.tsx
index aff12a648..0e4117a59 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/ProjectSupervisorView.tsx
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/ProjectSupervisorView.tsx
@@ -1,8 +1,7 @@
-import { ArrowUp, Loader2 } from 'lucide-react';
+import { ArrowUp, AtSign, Loader2 } from 'lucide-react';
 import type {
   ComponentProps,
   FormEventHandler,
-  Ref,
   RefObject,
   UIEventHandler,
 } from 'react';
@@ -70,7 +69,7 @@ type ProjectSupervisorViewProps = RuntimePanelProps & {
   chatInput: string;
   chatReferences: ChatReference[];
   chatProjectAssets: import('../../../../../packages/shared/src/contracts/gameCreationApp').GameCreationAppAssetManifestEntry[];
-  composerRef?: Ref<ResourceReferenceInputHandle>;
+  composerRef?: RefObject<ResourceReferenceInputHandle | null>;
   directCodex?: boolean;
   directStatus?: GameCreatorDirectTurnUpdateStatus | null;
   directProcessDetail?: string;
@@ -162,6 +161,24 @@ export function ProjectSupervisorView({
   const [modelValidating, setModelValidating] = useState(false);
   const modelSelectRef = useRef<ConversationModelSelectHandle>(null);
   const modelValidateInFlightRef = useRef(false);
+  const submitButton = (
+    <button
+      type="submit"
+      aria-label={submitLabel}
+      title={submitLabel}
+      disabled={
+        runtimePanelProps.controlBusy ||
+        needsUserInput ||
+        (directCodex && (!modelReady || modelValidating))
+      }
+    >
+      {submitting ? (
+        <Loader2 size={16} aria-hidden="true" className="animate-spin" />
+      ) : (
+        <ArrowUp size={16} aria-hidden="true" />
+      )}
+    </button>
+  );
   return (
     <section
       className={`project-supervisor-surface${directCodex ? ' is-direct-codex' : ''}`}
@@ -336,7 +353,9 @@ export function ProjectSupervisorView({
           </div>
         ) : null}
         <form
-          className="project-supervisor-composer"
+          className={`project-supervisor-composer${
+            directCodex ? ' is-direct-codex' : ''
+          }`}
           onSubmit={(event) => {
             if (!directCodex) {
               onSubmit(event);
@@ -371,6 +390,7 @@ export function ProjectSupervisorView({
             rows={3}
             value={chatInput}
             references={chatReferences}
+            showTriggerButton={!directCodex}
             placeholder={
               directCodex
                 ? '告诉陶泥儿接下来要做什么，或输入 @ 选择资源'
@@ -379,31 +399,28 @@ export function ProjectSupervisorView({
             onChange={onChatInputChange}
           />
           {directCodex ? (
-            <ConversationModelSelect
-              ref={modelSelectRef}
-              // 允许在对话进行中切换模型：写回的是客户端配置，只影响后续轮次，
-              // 当前回合不受影响；发送按钮仍由 controlBusy / modelReady 把关。
-              disabled={needsUserInput}
-              onReady={setModelReady}
-              projectPath={projectPath}
-            />
-          ) : null}
-          <button
-            type="submit"
-            aria-label={submitLabel}
-            title={submitLabel}
-            disabled={
-              runtimePanelProps.controlBusy ||
-              needsUserInput ||
-              (directCodex && (!modelReady || modelValidating))
-            }
-          >
-            {submitting ? (
-              <Loader2 size={16} aria-hidden="true" className="animate-spin" />
-            ) : (
-              <ArrowUp size={16} aria-hidden="true" />
-            )}
-          </button>
+            <div className="project-supervisor-composer-controls">
+              <ConversationModelSelect
+                ref={modelSelectRef}
+                disabled={runtimePanelProps.controlBusy || needsUserInput}
+                onReady={setModelReady}
+                projectPath={projectPath}
+              />
+              <button
+                type="button"
+                className="project-supervisor-reference-trigger"
+                aria-label="插入素材引用"
+                title="插入素材引用"
+                disabled={runtimePanelProps.controlBusy || needsUserInput}
+                onClick={() => composerRef?.current?.openPicker()}
+              >
+                <AtSign size={15} aria-hidden="true" />
+              </button>
+              {submitButton}
+            </div>
+          ) : (
+            submitButton
+          )}
         </form>
         <small className="project-supervisor-workspace-status">
           {projectWorkspaceStatusForDisplay(workspaceStatus)}
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/ResourceReferenceInput.tsx b/apps/ai-game-creator-shell/src/features/project-workspace/ResourceReferenceInput.tsx
index 96f1998f9..7e87f6804 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/ResourceReferenceInput.tsx
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/ResourceReferenceInput.tsx
@@ -84,11 +84,13 @@ type ResourceReferenceInputProps = {
   ariaLabel: string;
   multiline?: boolean;
   rows?: number;
+  showTriggerButton?: boolean;
   inputRef?: RefObject<HTMLDivElement | null>;
 };
 
 export type ResourceReferenceInputHandle = {
   insertReferences: (references: ChatReference[]) => void;
+  openPicker: () => void;
   focus: () => void;
 };
 
@@ -184,6 +186,7 @@ function ResourceReferenceEditor({
   ariaLabel,
   multiline,
   rows,
+  showTriggerButton = true,
   inputRef,
   composerRef,
 }: ResourceReferenceInputProps & {
@@ -254,13 +257,21 @@ function ResourceReferenceEditor({
     [editor],
   );
 
+  const openPicker = useCallback(() => {
+    setPickerQuery('');
+    setPickerFilter('all');
+    setSelectedResourceIds([]);
+    setPickerOpen(true);
+  }, []);
+
   useImperativeHandle(
     composerRef,
     () => ({
       insertReferences,
+      openPicker,
       focus: () => editor.focus(),
     }),
-    [editor, insertReferences],
+    [editor, insertReferences, openPicker],
   );
 
   useEffect(() => {
@@ -459,24 +470,21 @@ function ResourceReferenceEditor({
         }
         ErrorBoundary={LexicalErrorBoundary}
       />
-      <div className="resource-reference-input-actions">
-        <button
-          type="button"
-          className="resource-reference-input-at"
-          aria-label="插入素材引用"
-          title="插入素材引用"
-          disabled={disabled}
-          onMouseDown={(event) => event.preventDefault()}
-          onClick={() => {
-            setPickerQuery('');
-            setPickerFilter('all');
-            setSelectedResourceIds([]);
-            setPickerOpen(true);
-          }}
-        >
-          <AtSign size={15} aria-hidden="true" />
-        </button>
-      </div>
+      {showTriggerButton ? (
+        <div className="resource-reference-input-actions">
+          <button
+            type="button"
+            className="resource-reference-input-at"
+            aria-label="插入素材引用"
+            title="插入素材引用"
+            disabled={disabled}
+            onMouseDown={(event) => event.preventDefault()}
+            onClick={openPicker}
+          >
+            <AtSign size={15} aria-hidden="true" />
+          </button>
+        </div>
+      ) : null}
       <LexicalTypeaheadMenuPlugin<ResourceMentionOption>
         options={mentionOptions}
         triggerFn={triggerFn}
diff --git a/apps/ai-game-creator-shell/src/styles.css b/apps/ai-game-creator-shell/src/styles.css
index c27173650..1b58aa49c 100644
--- a/apps/ai-game-creator-shell/src/styles.css
+++ b/apps/ai-game-creator-shell/src/styles.css
@@ -9032,6 +9032,80 @@ iframe.preview-frame {
   background: #fff;
   font-size: 12px;
 
+/* Direct Codex composer: keep the editor and its actions in one vertical
+   structure instead of positioning each control independently. */
+.game-workbench-chat
+  .project-supervisor-surface.is-direct-codex
+  .project-supervisor-composer.is-direct-codex {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr);
+  grid-template-rows: auto auto;
+  gap: 8px;
+  align-items: stretch;
+  position: absolute;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  z-index: 5;
+  padding: 0;
+  background: transparent;
+  pointer-events: none;
+}
+
+.game-workbench-chat
+  .project-supervisor-surface.is-direct-codex
+  .project-supervisor-composer.is-direct-codex
+  .resource-reference-input {
+  width: 100%;
+  min-height: 72px;
+  padding: 12px 15px 10px;
+  pointer-events: auto;
+}
+
+.game-workbench-chat
+  .project-supervisor-surface.is-direct-codex
+  .project-supervisor-composer.is-direct-codex
+  .project-supervisor-composer-controls {
+  display: flex;
+  align-items: center;
+  justify-content: flex-end;
+  gap: 8px;
+  min-width: 0;
+  pointer-events: auto;
+}
+
+.game-workbench-chat
+  .project-supervisor-surface.is-direct-codex
+  .project-supervisor-composer.is-direct-codex
+  .project-supervisor-composer-controls
+  .conversation-model-select {
+  position: static !important;
+  right: auto !important;
+  bottom: auto !important;
+  max-width: min(220px, 40%);
+}
+
+.game-workbench-chat
+  .project-supervisor-surface.is-direct-codex
+  .project-supervisor-composer.is-direct-codex
+  .project-supervisor-composer-controls
+  > button {
+  position: static !important;
+  right: auto !important;
+  bottom: auto !important;
+  display: grid;
+  width: 30px;
+  min-width: 30px;
+  height: 30px;
+  min-height: 30px;
+  padding: 0;
+  border: 0;
+  border-radius: 9px;
+  background: var(--platform-button-primary-fill);
+  color: var(--platform-button-primary-text);
+  place-items: center;
+}
+
 .project-supervisor-composer .resource-reference-input {
   min-height: 72px;
 }