diff --git a/dist/src/exportArtifacts.js b/dist/src/exportArtifacts.js
index 9dd1203..e1380df 100644
--- a/dist/src/exportArtifacts.js
+++ b/dist/src/exportArtifacts.js
@@ -76,13 +76,19 @@ export async function exportXWorkmateArtifacts(input) {
     const artifactScope = requestedArtifactScope || expectedArtifactScope;
     const scopeRoot = resolveScopeRoot(workspaceRoot, artifactScope);
     const scopeKind = "task";
-    const candidates = await collectCandidates({
-        scanRoot: scopeRoot,
-        relativeRoot: scopeRoot,
-        sinceUnixMs,
-        skipTaskScopeRoot: false,
-        warnings,
-    });
+    const scopePrepared = await directoryExists(scopeRoot);
+    const candidates = scopePrepared
+        ? await collectCandidates({
+            scanRoot: scopeRoot,
+            relativeRoot: scopeRoot,
+            sinceUnixMs,
+            skipTaskScopeRoot: false,
+            warnings,
+        })
+        : [];
+    if (!scopePrepared) {
+        warnings.push("artifact scope is not prepared");
+    }
     candidates.sort((left, right) => {
         if (right.mtimeMs !== left.mtimeMs) {
             return right.mtimeMs - left.mtimeMs;
@@ -397,6 +403,15 @@ function safeTaskSessionScope(value) {
     }
     return scope;
 }
+async function directoryExists(absolutePath) {
+    try {
+        const stat = await fs.stat(absolutePath);
+        return stat.isDirectory();
+    }
+    catch {
+        return false;
+    }
+}
 function safeArtifactRefRunScope(value) {
     try {
         return safeTaskArtifactScope(value);
diff --git a/index.test.ts b/index.test.ts
index fc0a412..470cbc5 100644
--- a/index.test.ts
+++ b/index.test.ts
@@ -7,6 +7,11 @@ import plugin from "./index.js";
 import { prepareXWorkmateArtifacts } from "./src/exportArtifacts.js";
 
 type GatewayMethodHandler = Parameters<OpenClawPluginApi["registerGatewayMethod"]>[1];
+type GatewayMethodResponse = {
+  ok: boolean;
+  payload?: Record<string, unknown>;
+  error?: { code?: string; message?: string };
+};
 
 describe("plugin registration", () => {
   it("declares registered agent tools in the manifest contract", () => {
@@ -50,6 +55,68 @@ describe("plugin registration", () => {
     });
   });
 
+  it("executes registered gateway methods against the current task scope", async () => {
+    const root = await fs.promises.mkdtemp(path.join(os.tmpdir(), "tmp-openclaw-multi-session-gateway-"));
+    const methods = new Map<string, GatewayMethodHandler>();
+    const api = {
+      config: {},
+      pluginConfig: { workspaceDir: root },
+      registerGatewayMethod: (method: string, handler: GatewayMethodHandler) => {
+        methods.set(method, handler);
+      },
+      registerTool: () => undefined,
+    } as unknown as OpenClawPluginApi;
+
+    plugin.register(api);
+
+    const prepared = await callGatewayMethod(methods, "xworkmate.artifacts.prepare", {
+      sessionKey: "thread-main",
+      runId: "turn-1",
+    });
+    expect(prepared.ok).toBe(true);
+    expect(prepared.payload?.artifactScope).toBe("tasks/thread-main/turn-1");
+    const artifactDirectory = String(prepared.payload?.artifactDirectory);
+
+    const emptyExport = await callGatewayMethod(methods, "xworkmate.artifacts.export", {
+      sessionKey: "thread-main",
+      runId: "turn-1",
+      artifactScope: prepared.payload?.artifactScope,
+    });
+    expect(emptyExport.ok).toBe(true);
+    expect(emptyExport.payload?.artifacts).toEqual([]);
+    expect(emptyExport.payload?.warnings).toEqual([]);
+
+    await fs.promises.mkdir(path.join(artifactDirectory, "reports"), { recursive: true });
+    await fs.promises.writeFile(path.join(artifactDirectory, "reports", "final.md"), "final");
+
+    const listed = await callGatewayMethod(methods, "xworkmate.artifacts.list", {
+      sessionKey: "thread-main",
+      runId: "turn-1",
+      artifactScope: prepared.payload?.artifactScope,
+    });
+    expect(listed.ok).toBe(true);
+    expect(listed.payload?.artifacts).toMatchObject([{ relativePath: "reports/final.md" }]);
+    const listedArtifacts = listed.payload?.artifacts as Array<Record<string, unknown>>;
+    expect(listedArtifacts[0]).not.toHaveProperty("content");
+
+    const read = await callGatewayMethod(methods, "xworkmate.artifacts.read", {
+      sessionKey: "thread-main",
+      runId: "turn-1",
+      artifactScope: prepared.payload?.artifactScope,
+      relativePath: "reports/final.md",
+    });
+    expect(read.ok).toBe(true);
+    expect(read.payload?.artifacts).toMatchObject([{ relativePath: "reports/final.md", encoding: "base64" }]);
+
+    const unprepared = await callGatewayMethod(methods, "xworkmate.artifacts.export", {
+      sessionKey: "thread-main",
+      runId: "turn-unprepared",
+    });
+    expect(unprepared.ok).toBe(true);
+    expect(unprepared.payload?.artifacts).toEqual([]);
+    expect(unprepared.payload?.warnings).toEqual(["artifact scope is not prepared"]);
+  });
+
   it("does not invent default session or run ids for the optional agent tool", async () => {
     const tools: Array<{ tool: unknown; options: unknown }> = [];
     const api = {
@@ -120,3 +187,25 @@ describe("plugin registration", () => {
     expect(result.content[0]?.text).not.toContain("global.txt");
   });
 });
+
+async function callGatewayMethod(
+  methods: Map<string, GatewayMethodHandler>,
+  method: string,
+  params: Record<string, unknown>,
+): Promise<GatewayMethodResponse> {
+  const handler = methods.get(method);
+  if (!handler) {
+    throw new Error(`missing gateway method ${method}`);
+  }
+  let response: GatewayMethodResponse | undefined;
+  await handler({
+    params,
+    respond: (ok: boolean, payload?: Record<string, unknown>, error?: GatewayMethodResponse["error"]) => {
+      response = { ok, payload, error };
+    },
+  } as Parameters<GatewayMethodHandler>[0]);
+  if (!response) {
+    throw new Error(`gateway method ${method} did not respond`);
+  }
+  return response;
+}
diff --git a/src/exportArtifacts.ts b/src/exportArtifacts.ts
index dba4b71..f454cef 100644
--- a/src/exportArtifacts.ts
+++ b/src/exportArtifacts.ts
@@ -157,13 +157,19 @@ export async function exportXWorkmateArtifacts(input: ExportInput): Promise<XWor
   const artifactScope = requestedArtifactScope || expectedArtifactScope;
   const scopeRoot = resolveScopeRoot(workspaceRoot, artifactScope);
   const scopeKind: XWorkmateArtifactScopeKind = "task";
-  const candidates = await collectCandidates({
-    scanRoot: scopeRoot,
-    relativeRoot: scopeRoot,
-    sinceUnixMs,
-    skipTaskScopeRoot: false,
-    warnings,
-  });
+  const scopePrepared = await directoryExists(scopeRoot);
+  const candidates = scopePrepared
+    ? await collectCandidates({
+        scanRoot: scopeRoot,
+        relativeRoot: scopeRoot,
+        sinceUnixMs,
+        skipTaskScopeRoot: false,
+        warnings,
+      })
+    : [];
+  if (!scopePrepared) {
+    warnings.push("artifact scope is not prepared");
+  }
 
   candidates.sort((left, right) => {
     if (right.mtimeMs !== left.mtimeMs) {
@@ -523,6 +529,15 @@ function safeTaskSessionScope(value: unknown): string {
   return scope;
 }
 
+async function directoryExists(absolutePath: string): Promise<boolean> {
+  try {
+    const stat = await fs.stat(absolutePath);
+    return stat.isDirectory();
+  } catch {
+    return false;
+  }
+}
+
 function safeArtifactRefRunScope(value: unknown): string {
   try {
     return safeTaskArtifactScope(value);