fix(active-memory): skip payload-less memory_search toolResults in tr… (openclaw#68773)

Verified:
- pnpm install --frozen-lockfile
- pnpm test extensions/active-memory/index.test.ts
- pnpm exec oxfmt --check --threads=1 extensions/active-memory/index.ts extensions/active-memory/index.test.ts CHANGELOG.md
- git diff --check origin/main..HEAD
- gh pr checks 68773 --repo openclaw/openclaw --required

Co-authored-by: SimbaKingjoe <126222269+SimbaKingjoe@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

CHANGELOG.md

@@ -14,6 +14,7 @@ Docs: https://docs.openclaw.ai
 - fix(agents): canonicalize provider aliases in byProvider tool policy lookup [AI]. (#72917) Thanks @pgondhi987.
 - fix(security): block npm_execpath injection from workspace .env [AI-assisted]. (#73262) Thanks @pgondhi987.
 - Tools/web_fetch: decode response bodies from raw bytes using declared HTTP, XML, or HTML meta charsets before extraction, so Shift_JIS and other legacy-charset pages no longer return mojibake. Fixes #72916. Thanks @amknight.
+- Active Memory: skip payload-less `memory_search` transcript tool results when building debug telemetry, so newer empty entries no longer hide the latest useful debug payload. (#68773) Thanks @SimbaKingjoe.
 - Channels/Discord: bound message read/search REST calls, route those actions through Gateway execution, and fall back to `CommandTargetSessionKey` for inbound hook session keys so Discord reads do not hang and hooks still fire when `SessionKey` is empty. Fixes #73431. (#73521) Thanks @amknight.
 - Plugins/media: auto-enable provider plugins referenced by `agents.defaults.imageGenerationModel`, `videoGenerationModel`, and `musicGenerationModel` primary/fallback refs, so configured Google and MiniMax media providers do not stay disabled behind a restrictive plugin allowlist. Thanks @vincentkoc.
 - Memory-core/dreaming: retry managed dreaming cron registration after startup when the cron service is not reachable yet, so the scheduled Memory Dreaming Promotion sweep recovers without waiting for heartbeat traffic. Fixes #72841. Thanks @amknight.

extensions/active-memory/index.test.ts

@@ -1101,6 +1101,54 @@ describe("active-memory plugin", () => {
     ]);
   });
 
+  it("skips newest memory_search toolResult entries that carry no debug payload", async () => {
+    const sessionKey = "agent:main:transcript-debug";
+    hoisted.sessionStore[sessionKey] = { sessionId: "s-main", updatedAt: 0 };
+
+    runEmbeddedPiAgent.mockImplementationOnce(async (params: { sessionFile: string }) => {
+      const lines = [
+        JSON.stringify({
+          message: {
+            role: "toolResult",
+            toolName: "memory_search",
+            details: { debug: { backend: "qmd", hits: 3 } },
+          },
+        }),
+        JSON.stringify({
+          message: {
+            role: "toolResult",
+            toolName: "memory_search",
+            details: {},
+          },
+        }),
+      ];
+      await fs.writeFile(params.sessionFile, `${lines.join("\n")}\n`, "utf8");
+      return { payloads: [{ text: "wings are fine." }] };
+    });
+
+    await hooks.before_prompt_build(
+      { prompt: "debug transcript bug", messages: [] },
+      { agentId: "main", trigger: "user", sessionKey, messageProvider: "webchat" },
+    );
+
+    const updater = hoisted.updateSessionStore.mock.calls.at(-1)?.[1] as
+      | ((store: Record<string, Record<string, unknown>>) => void)
+      | undefined;
+    const store = {
+      [sessionKey]: { sessionId: "s-main", updatedAt: 0 },
+    } as Record<string, Record<string, unknown>>;
+    updater?.(store);
+    const entries = store[sessionKey]?.pluginDebugEntries as
+      | { pluginId: string; lines: string[] }[]
+      | undefined;
+    const debugLine = entries?.[0]?.lines.find((line) =>
+      line.startsWith("🔎 Active Memory Debug:"),
+    );
+    expect(debugLine).toBeDefined();
+    expect(debugLine).toContain("backend=qmd");
+    expect(debugLine).toContain("hits=3");
+  });
+
   it("replaces stale structured active-memory lines on a later empty run", async () => {
     const sessionKey = "agent:main:stale-active-memory-lines";
     hoisted.sessionStore[sessionKey] = {

extensions/active-memory/index.ts

@@ -1234,7 +1234,7 @@ async function readActiveMemorySearchDebug(
         continue;
       }
       const details = asRecord(message.details);
-      const debug = asRecord(details?.debug) ?? {};
+      const debug = asRecord(details?.debug);
       const warning = normalizeOptionalString(details?.warning);
       const action = normalizeOptionalString(details?.action);
       const error = normalizeOptionalString(details?.error);