diff --git a/docs/cloud-resource-library-device.md b/docs/cloud-resource-library-device.md
index f8e31051..d573f278 100644
--- a/docs/cloud-resource-library-device.md
+++ b/docs/cloud-resource-library-device.md
@@ -2,9 +2,9 @@
 
 状态：**开发中，尚未开放远程安装**。NexusDock Cloud 与 AgentDock 都以 `uvwt/agentdock-protocol` 的稳定版本为边界；AgentDock 永远不接受 Cloud Tenant/订阅含义。
 
-## 可移植 Skill / Plugin 与安全边界
+## Skill / Plugin 备份与安全边界
 
-- Skill 仍是纯 `SKILL.md` 资源包，沿用现有本地/URL安装、摘要、文件数和 128 MiB 字节限制。Cloud 修订号不写入 Skill frontmatter。
+- Skill 以安装根目录的 `SKILL.md` 作为当前包的 Manifest；子目录中的同名 `SKILL.md` 只是普通资源文件，不额外注册 Skill。沿用现有本地/URL 安装、摘要、文件数和 128 MiB 字节限制。Cloud 修订号不写入 Skill frontmatter。
 - Plugin 仍是支持 Portable/OpenAI/Claude 的包，保留 `plugin_manage validate` / `install` / `update` 和内容绑定的 `review_token`；压缩包 64 MiB、提取后 256 MiB。Cloud 修订号不覆盖插件 manifest 原版号；同名非-local 版本不同内容仍拒绝。
 - **设备备份保留受管 Skill/Plugin 的完整常规文件**，包括用户提供的配置、依赖、缓存、凭据等内容；不按文件名、目录名、扩展名或内容自动剔除，不进行敏感内容扫描，也不生成此类提示。只沿用原生安装器一致的 ZIP 传输元数据忽略规则，保留路径穿越、符号链接、文件类型和容量安全门禁。Cloud 当前可读取 ZIP，不提供端到端加密。
 - 本地检验需要负责 ZIP 路径穿越、符号链接、文件类型、文件数量、解包大小、插件命令/MCP 配置风险；Cloud 只能展示报告和摘要，不能代替设备安装器。
diff --git a/internal/resourcelibrary/export.go b/internal/resourcelibrary/export.go
index 6894fe34..a3bb4447 100644
--- a/internal/resourcelibrary/export.go
+++ b/internal/resourcelibrary/export.go
@@ -9,7 +9,6 @@ import (
 	"os"
 	"path/filepath"
 	"sort"
-	"strings"
 
 	skills "github.com/uvwt/agentdock/internal/skill"
 )
@@ -17,7 +16,6 @@ import (
 // Export 是受管资源的安全备份 ZIP 摘要。本地绝对路径不会出现在结果里。
 type Export struct {
 	Files         []FileEntry
-	Warnings      []string
 	Size          int64
 	ArchiveDigest string
 	ContentDigest string
@@ -42,7 +40,7 @@ func ExportDirectory(root, kind, destination string) (Export, error) {
 		return Export{}, failed("PACKAGE_INVALID", "validation", "managed package must be a regular directory")
 	}
 
-	files, err := collectPortableFiles(root, kind)
+	files, err := collectBackupFiles(root, kind)
 	if err != nil {
 		return Export{}, err
 	}
@@ -54,7 +52,7 @@ func ExportDirectory(root, kind, destination string) (Export, error) {
 	}
 
 	// 摘要按实际文件集计算，原生安装器仅忽略操作系统 ZIP 传输元数据。
-	size, archiveDigest, contentDigest, err := writePortableZip(root, files, destination, archiveLimit(kind))
+	size, archiveDigest, contentDigest, err := writeBackupZip(root, files, destination, archiveLimit(kind))
 	if err != nil {
 		return Export{}, err
 	}
@@ -73,7 +71,7 @@ func hasFile(files []FileEntry, name string) bool {
 	return false
 }
 
-func collectPortableFiles(root, kind string) ([]FileEntry, error) {
+func collectBackupFiles(root, kind string) ([]FileEntry, error) {
 	fsRoot, err := os.OpenRoot(root)
 	if err != nil {
 		return nil, failed("PACKAGE_INVALID", "validation", "managed package directory cannot be opened")
@@ -117,10 +115,6 @@ func collectPortableFiles(root, kind string) ([]FileEntry, error) {
 		if !info.Mode().IsRegular() {
 			return failedf("PACKAGE_INVALID", "validation", "special file is not allowed: %s", relative)
 		}
-		// Skill 只有根目录 SKILL.md 是 Manifest；嵌套同名文件会让 Cloud/安装器产生歧义。
-		if kind == KindSkill && relative != "SKILL.md" && strings.HasSuffix(relative, "/SKILL.md") {
-			return failedf("PACKAGE_INVALID", "validation", "managed Skill export contains a nested SKILL.md: %s", relative)
-		}
 		if info.Size() < 0 || total > extractLimit(kind)-info.Size() {
 			return failedf("PACKAGE_INVALID", "validation", "package exceeds %d bytes", extractLimit(kind))
 		}
@@ -141,7 +135,7 @@ func collectPortableFiles(root, kind string) ([]FileEntry, error) {
 	return files, nil
 }
 
-func writePortableZip(root string, files []FileEntry, destination string, limit int64) (int64, string, string, error) {
+func writeBackupZip(root string, files []FileEntry, destination string, limit int64) (int64, string, string, error) {
 	fsRoot, err := os.OpenRoot(root)
 	if err != nil {
 		return 0, "", "", failed("PACKAGE_INVALID", "validation", "managed package directory cannot be opened")
diff --git a/internal/resourcelibrary/export_test.go b/internal/resourcelibrary/export_test.go
index 678dc98d..65047979 100644
--- a/internal/resourcelibrary/export_test.go
+++ b/internal/resourcelibrary/export_test.go
@@ -26,9 +26,6 @@ func TestExportDirectory_完整保留配置文件(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	if len(exported.Warnings) != 0 {
-		t.Fatalf("unexpected warnings: %#v", exported.Warnings)
-	}
 	if len(exported.Files) != 1+len(files) {
 		t.Fatalf("lost files: %#v", exported.Files)
 	}
@@ -134,9 +131,6 @@ func TestExportDirectory_源码和依赖目录都保留(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	if len(exported.Warnings) != 0 {
-		t.Fatalf("unexpected warnings: %#v", exported.Warnings)
-	}
 	if len(exported.Files) != len(files)+1 {
 		t.Fatalf("unexpected files: %#v", exported.Files)
 	}
@@ -182,21 +176,29 @@ func TestExportDirectory_敏感文件名不触发额外校验(t *testing.T) {
 			if err != nil {
 				t.Fatal(err)
 			}
-			if !hasFile(exported.Files, name) || len(exported.Warnings) != 0 {
-				t.Fatalf("unexpected filtering: %#v", exported)
+			if !hasFile(exported.Files, name) {
+				t.Fatalf("file omitted: %#v", exported)
 			}
 		})
 	}
 }
 
-func TestExportDirectory_Skill只允许根目录Manifest(t *testing.T) {
+func TestExportDirectory_嵌套Skill文档作为普通资源保留(t *testing.T) {
 	root := t.TempDir()
-	writeFile(t, filepath.Join(root, "SKILL.md"), "---\nname: demo-skill\ndescription: Export demo.\n---\n")
-	writeFile(t, filepath.Join(root, "docs", "SKILL.md"), "---\nname: stale-copy\ndescription: Old manifest.\n---\n")
+	writeFile(t, filepath.Join(root, "SKILL.md"), "---\nname: demo-skill\ndescription: Export demo.\n---\n\n# Demo\n")
+	writeFile(t, filepath.Join(root, "docs", "SKILL.md"), "---\nname: example-only\ndescription: Example document.\n---\n\n# Example\n")
 
-	_, err := ExportDirectory(root, KindSkill, filepath.Join(t.TempDir(), "skill.zip"))
-	if err == nil || !errorCode(err, "PACKAGE_INVALID") {
-		t.Fatalf("nested SKILL.md error = %v", err)
+	archive := filepath.Join(t.TempDir(), "skill.zip")
+	exported, err := ExportDirectory(root, KindSkill, archive)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !hasFile(exported.Files, "docs/SKILL.md") {
+		t.Fatalf("nested SKILL.md was omitted: %#v", exported.Files)
+	}
+	preview, err := validateSkillArchive(t, archive, exported.ArchiveDigest, "demo-skill", exported.ContentDigest)
+	if err != nil || !preview.Valid {
+		t.Fatalf("native Skill validator rejected nested resource document: %#v %v", preview, err)
 	}
 }
 
@@ -211,8 +213,8 @@ func TestExportDirectory_Plugin完整保留配置(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	if !hasFile(exported.Files, ".env") || !hasFile(exported.Files, "notes.pem") || len(exported.Warnings) != 0 {
-		t.Fatalf("plugin filtering: %#v", exported)
+	if !hasFile(exported.Files, ".env") || !hasFile(exported.Files, "notes.pem") {
+		t.Fatalf("plugin files lost: %#v", exported.Files)
 	}
 	if err := InspectArchive(archive, KindPlugin); err != nil {
 		t.Fatal(err)
diff --git a/internal/resourcelibrary/service.go b/internal/resourcelibrary/service.go
index aab2dc24..9fd4f9a4 100644
--- a/internal/resourcelibrary/service.go
+++ b/internal/resourcelibrary/service.go
@@ -109,7 +109,6 @@ type stagedPackage struct {
 	ReviewToken   string
 	Expires       time.Time
 	Files         []FileEntry
-	Warnings      []string
 	Size          int64
 }
 
@@ -232,7 +231,7 @@ func (s *Service) exportPrepare(request controlRequest) (map[string]any, error)
 	grant, err := s.remember(stagedPackage{
 		Purpose: purposeExport, Kind: kind, Name: name, Operation: "export",
 		ArchivePath: destination, ArchiveDigest: exported.ArchiveDigest, PackageDigest: exported.ContentDigest,
-		Expires: s.deps.Now().Add(ChallengeTTL), Files: exported.Files, Warnings: exported.Warnings, Size: exported.Size,
+		Expires: s.deps.Now().Add(ChallengeTTL), Files: exported.Files, Size: exported.Size,
 	})
 	if err != nil {
 		_ = os.Remove(destination)
@@ -241,7 +240,7 @@ func (s *Service) exportPrepare(request controlRequest) (map[string]any, error)
 	return map[string]any{
 		"ok": true, "action": ActionExportPrepare, "kind": kind, "name": name,
 		"archive_digest": exported.ArchiveDigest, "content_digest": exported.ContentDigest,
-		"size": exported.Size, "files": exported.Files, "warnings": exported.Warnings,
+		"size": exported.Size, "files": exported.Files,
 		"download_grant": grant, "download_authorized": true, "expires_at": s.pendingExpiry(grant),
 		"transfer": "local_grant_only", "stream_upload_available": true,
 	}, nil
diff --git a/internal/resourcelibrary/service_test.go b/internal/resourcelibrary/service_test.go
index a9aa5a38..835e56aa 100644
--- a/internal/resourcelibrary/service_test.go
+++ b/internal/resourcelibrary/service_test.go
@@ -35,6 +35,9 @@ func TestService_导出受管Skill且响应不含本地路径(t *testing.T) {
 	if result["stream_upload_available"] != true || result["transfer"] != "local_grant_only" {
 		t.Fatalf("export transfer = %#v", result)
 	}
+	if _, exists := result["warnings"]; exists {
+		t.Fatalf("export response retained obsolete warnings field: %#v", result)
+	}
 	if strings.Contains(result["archive_digest"].(string), "/") {
 		t.Fatalf("digest leaked a path: %#v", result["archive_digest"])
 	}