fix(harness): surface returned tool errors

extensions/copilot/src/tool-bridge.test.ts

@@ -1314,17 +1314,20 @@ describe("convertOpenClawToolToSdkTool", () => {
     );
   });
 
-  it("reports returned OpenClaw error results as observer failures", async () => {
+  it("reports returned OpenClaw error results to both tool observers", async () => {
     const onAgentToolResult = vi.fn();
+    const onToolCompleted = vi.fn();
     const sourceResult = {
       content: [{ text: '{"status":"error","error":"backend unavailable"}', type: "text" }],
       details: { status: "error", error: "backend unavailable" },
     };
     const sdkTool = convertOpenClawToolToSdkTool(makeTool({}, sourceResult), {
       onAgentToolResult,
+      onToolCompleted,
     });
 
     const result = await runSdkTool(sdkTool, {});
+    await flushAsync();
 
     expect(result).toMatchObject({ resultType: "success" });
     expect(onAgentToolResult).toHaveBeenCalledWith({
@@ -1332,6 +1335,12 @@ describe("convertOpenClawToolToSdkTool", () => {
       result: sourceResult,
       isError: true,
     });
+    expect(onToolCompleted).toHaveBeenCalledWith(
+      expect.objectContaining({
+        error: "backend unavailable",
+        result: sourceResult,
+      }),
+    );
   });
 
   it("joins multiple text blocks with newlines", async () => {

extensions/copilot/src/tool-bridge.ts

@@ -8,6 +8,7 @@ import type {
 import {
   applyEmbeddedAttemptToolsAllow,
   buildEmbeddedAttemptToolRunContext,
+  extractToolErrorMessage,
   getPluginToolMeta,
   isSubagentSessionKey,
   isToolResultError,
@@ -515,15 +516,15 @@ export function convertOpenClawToolToSdkTool(
 
     const sdkResult = agentToolResultToSdk(result);
     const sanitizedResult = sanitizeToolResult(result);
-    notifyToolResult(
-      sanitizedResult,
-      sdkResult.resultType === "failure" || isToolResultError(sanitizedResult),
-    );
+    const resultIsError = sdkResult.resultType === "failure" || isToolResultError(sanitizedResult);
+    const resultError = resultIsError ? extractToolErrorMessage(sanitizedResult) : undefined;
+    notifyToolResult(sanitizedResult, resultIsError);
     notifyToolCompleted({
       toolName: sourceTool.name,
       toolCallId: invocation.toolCallId,
       args: toToolStartArgs(preparedArgs),
       result: sanitizedResult,
+      ...(resultError ? { error: resultError } : {}),
       startedAt,
     });
     return sdkResult;

src/plugin-sdk/agent-harness-runtime.ts

@@ -131,6 +131,7 @@ export { isMessagingTool, isMessagingToolSendAction } from "../agents/embedded-a
 export {
   extractMessagingToolSend,
   extractMessagingToolSendResult,
+  extractToolErrorMessage,
   extractToolResultMediaArtifact,
   filterToolResultMediaUrls,
   isToolResultError,