diff --git a/internal/acp/orchestrator.go b/internal/acp/orchestrator.go
index dbfbbfa..3f4ed0d 100644
--- a/internal/acp/orchestrator.go
+++ b/internal/acp/orchestrator.go
@@ -850,6 +850,12 @@ type openClawArtifactContract struct {
 	SourceMessage          string
 }
 
+// defaultOpenClawExpectedArtifactDirs 是 agent 最常用的产物落盘目录。当任务期望产物却没有
+// 显式声明目录时，用作 openclaw-multi-session-plugins 的 workspace 根兜底扫描范围（S1）。
+func defaultOpenClawExpectedArtifactDirs() []string {
+	return []string{"reports/", "artifacts/", "exports/"}
+}
+
 func openClawArtifactContractForParams(params map[string]any, chatParams map[string]any) openClawArtifactContract {
 	metadata := shared.AsMap(params["metadata"])
 	taskLoadClass := strings.TrimSpace(shared.StringArg(metadata, "taskLoadClass", ""))
@@ -869,6 +875,14 @@ func openClawArtifactContractForParams(params map[string]any, chatParams map[str
 	if len(requiredExts) == 0 {
 		requiredExts = inferOpenClawRequiredArtifactExts(lowerMessage)
 	}
+	// S1（docs/cases/06 §7）：任务期望产物（需导出 或 已推断出 requiredExts）却没有显式声明
+	// expectedArtifactDirs 时，补一组缺省目录。openclaw-multi-session-plugins 在 task scope
+	// 目录为空时会回扫 workspace 根的 expectedArtifactDirs；该列表为空则兜底形同虚设，
+	// agent 写到 workspace 根（reports//artifacts//exports/）的产物就再也收不回（表现「暂无文件」）。
+	if len(expectedDirs) == 0 && (requiresExport || len(requiredExts) > 0) {
+		expectedDirs = defaultOpenClawExpectedArtifactDirs()
+		requiresExport = true
+	}
 	expectedFileCounts := normalizeOpenClawArtifactExtCountMap(shared.AsMap(contract["expectedFileCountByExtension"]))
 	if len(expectedFileCounts) == 0 {
 		expectedFileCounts = normalizeOpenClawArtifactExtCountMap(shared.AsMap(metadata["expectedFileCountByExtension"]))
diff --git a/internal/acp/orchestrator_s1_artifact_dirs_test.go b/internal/acp/orchestrator_s1_artifact_dirs_test.go
new file mode 100644
index 0000000..29e98b3
--- /dev/null
+++ b/internal/acp/orchestrator_s1_artifact_dirs_test.go
@@ -0,0 +1,19 @@
+package acp
+import "testing"
+func TestS1DefaultExpectedArtifactDirs(t *testing.T) {
+	// 任务消息要求产出 md → 推断 requiredExts，但未声明 expectedArtifactDirs → 应补缺省目录
+	c := openClawArtifactContractForParams(
+		map[string]any{}, map[string]any{"message": "采集最新AI资讯，保存在md文件"})
+	if len(c.ExpectedArtifactDirs) == 0 {
+		t.Fatalf("expected default artifact dirs for an md-producing task, got none")
+	}
+	if !c.RequiresArtifactExport {
+		t.Fatalf("expected RequiresArtifactExport=true when default dirs applied")
+	}
+	// 纯聊天（无产物意图）→ 不应补目录、不应强制导出
+	c2 := openClawArtifactContractForParams(
+		map[string]any{}, map[string]any{"message": "你好，介绍一下你自己"})
+	if len(c2.ExpectedArtifactDirs) != 0 || c2.RequiresArtifactExport {
+		t.Fatalf("pure chat should not get default dirs / forced export, got dirs=%v export=%v", c2.ExpectedArtifactDirs, c2.RequiresArtifactExport)
+	}
+}