diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6bc7bf6f07f..1ba832e4692 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -48,6 +48,7 @@ Docs: https://docs.openclaw.ai
 - Control UI/Sessions: restore single-column session table collapse on narrow viewport or container widths by moving the responsive table override next to the base grid rule and enabling inline-size container queries. (#12175) Thanks @benjipeng.
 - Telegram/final preview delivery: split active preview lifecycle from cleanup retention so missing archived preview edits avoid duplicate fallback sends without clearing the live preview or blocking later in-place finalization. (#41662) thanks @hougangdev.
 - Cron/state errors: record `lastErrorReason` in cron job state and keep the gateway schema aligned with the full failover-reason set, including regression coverage for protocol conformance. (#14382) thanks @futuremind2026.
+- Tools/web search: recover OpenRouter Perplexity citation extraction from `message.annotations` when chat-completions responses omit top-level citations. (#40881) Thanks @laurieluo.
 
 ## 2026.3.8
 
diff --git a/src/agents/tools/web-search.ts b/src/agents/tools/web-search.ts
index 4fbbfa95e43..6e9518f1ede 100644
--- a/src/agents/tools/web-search.ts
+++ b/src/agents/tools/web-search.ts
@@ -396,6 +396,16 @@ type PerplexitySearchResponse = {
   choices?: Array<{
     message?: {
       content?: string;
+      annotations?: Array<{
+        type?: string;
+        url?: string;
+        url_citation?: {
+          url?: string;
+          title?: string;
+          start_index?: number;
+          end_index?: number;
+        };
+      }>;
     };
   }>;
   citations?: string[];
@@ -414,6 +424,38 @@ type PerplexitySearchApiResponse = {
   id?: string;
 };
 
+function extractPerplexityCitations(data: PerplexitySearchResponse): string[] {
+  const normalizeUrl = (value: unknown): string | undefined => {
+    if (typeof value !== "string") {
+      return undefined;
+    }
+    const trimmed = value.trim();
+    return trimmed ? trimmed : undefined;
+  };
+
+  const topLevel = (data.citations ?? [])
+    .map(normalizeUrl)
+    .filter((url): url is string => Boolean(url));
+  if (topLevel.length > 0) {
+    return [...new Set(topLevel)];
+  }
+
+  const citations: string[] = [];
+  for (const choice of data.choices ?? []) {
+    for (const annotation of choice.message?.annotations ?? []) {
+      if (annotation.type !== "url_citation") {
+        continue;
+      }
+      const url = normalizeUrl(annotation.url_citation?.url ?? annotation.url);
+      if (url) {
+        citations.push(url);
+      }
+    }
+  }
+
+  return [...new Set(citations)];
+}
+
 function extractGrokContent(data: GrokSearchResponse): {
   text: string | undefined;
   annotationCitations: string[];
@@ -1252,7 +1294,8 @@ async function runPerplexitySearch(params: {
 
       const data = (await res.json()) as PerplexitySearchResponse;
       const content = data.choices?.[0]?.message?.content ?? "No response";
-      const citations = data.citations ?? [];
+      // Prefer top-level citations; fall back to OpenRouter-style message annotations.
+      const citations = extractPerplexityCitations(data);
 
       return { content, citations };
     },
diff --git a/src/agents/tools/web-tools.enabled-defaults.test.ts b/src/agents/tools/web-tools.enabled-defaults.test.ts
index 4951f1c6b5a..ad3345a3e06 100644
--- a/src/agents/tools/web-tools.enabled-defaults.test.ts
+++ b/src/agents/tools/web-tools.enabled-defaults.test.ts
@@ -113,11 +113,13 @@ function installPerplexitySearchApiFetch(results?: Array<Record<string, unknown>
   });
 }
 
-function installPerplexityChatFetch() {
-  return installMockFetch({
-    choices: [{ message: { content: "ok" } }],
-    citations: ["https://example.com"],
-  });
+function installPerplexityChatFetch(payload?: Record<string, unknown>) {
+  return installMockFetch(
+    payload ?? {
+      choices: [{ message: { content: "ok" } }],
+      citations: ["https://example.com"],
+    },
+  );
 }
 
 function createProviderSuccessPayload(
@@ -509,6 +511,42 @@ describe("web_search perplexity OpenRouter compatibility", () => {
     expect(body.search_recency_filter).toBe("week");
   });
 
+  it("falls back to message annotations when top-level citations are missing", async () => {
+    vi.stubEnv("OPENROUTER_API_KEY", "sk-or-v1-test"); // pragma: allowlist secret
+    const mockFetch = installPerplexityChatFetch({
+      choices: [
+        {
+          message: {
+            content: "ok",
+            annotations: [
+              {
+                type: "url_citation",
+                url_citation: { url: "https://example.com/a" },
+              },
+              {
+                type: "url_citation",
+                url_citation: { url: "https://example.com/b" },
+              },
+              {
+                type: "url_citation",
+                url_citation: { url: "https://example.com/a" },
+              },
+            ],
+          },
+        },
+      ],
+    });
+    const tool = createPerplexitySearchTool();
+    const result = await tool?.execute?.("call-1", { query: "test" });
+
+    expect(mockFetch).toHaveBeenCalled();
+    expect(result?.details).toMatchObject({
+      provider: "perplexity",
+      citations: ["https://example.com/a", "https://example.com/b"],
+      content: expect.stringContaining("ok"),
+    });
+  });
+
   it("fails loud for Search API-only filters on the compatibility path", async () => {
     vi.stubEnv("OPENROUTER_API_KEY", "sk-or-v1-test"); // pragma: allowlist secret
     const mockFetch = installPerplexityChatFetch();