diff --git a/src/agents/tools/cron-tool.test.ts b/src/agents/tools/cron-tool.test.ts
index d54faed1339..77e29a5646f 100644
--- a/src/agents/tools/cron-tool.test.ts
+++ b/src/agents/tools/cron-tool.test.ts
@@ -12,6 +12,7 @@ vi.mock("../agent-scope.js", async () => {
   };
 });
 
+import { buildAgentPeerSessionKey } from "../../routing/session-key.js";
 import { createCronTool } from "./cron-tool.js";
 
 describe("cron tool", () => {
@@ -823,6 +824,53 @@ describe("cron tool", () => {
     });
   });
 
+  it("does not surface lowercased LINE recipients when current delivery context is unavailable (#81628)", async () => {
+    // Reproduces openclaw/openclaw#81628. LINE chat IDs are case-sensitive — push
+    // requires capital C/U/R; lowercased recipients return HTTP 400. The runtime
+    // already lowercases LINE peer IDs when canonicalizing the session key, and
+    // when the delivery-recovery / post-reply-token-expiry push path is missing
+    // currentDeliveryContext, inferDeliveryFromSessionKey lifts the lowercased
+    // fragment straight into delivery.to.
+    const sessionKey = buildAgentPeerSessionKey({
+      agentId: "main",
+      channel: "line",
+      peerKind: "group",
+      peerId: "Cabcdef0123456789abcdef0123456789",
+    });
+    expect(sessionKey).toBe("agent:main:line:group:cabcdef0123456789abcdef0123456789");
+
+    const delivery = await executeAddAndReadDelivery({
+      callId: "call-line-group-no-context-81628",
+      agentSessionKey: sessionKey,
+      // Intentionally no currentDeliveryContext — emulates the delivery-recovery
+      // boundary that reloads queued entries from disk after the reply token has
+      // expired.
+    });
+
+    expect(delivery?.to).toBeUndefined();
+  });
+
+  it("does not surface lowercased LINE DM recipients with per-account-channel-peer scope (#81628)", async () => {
+    const sessionKey = buildAgentPeerSessionKey({
+      agentId: "main",
+      channel: "line",
+      peerKind: "direct",
+      accountId: "primary",
+      dmScope: "per-account-channel-peer",
+      peerId: "Uabcdef0123456789abcdef0123456789",
+    });
+    expect(sessionKey).toBe(
+      "agent:main:line:primary:direct:uabcdef0123456789abcdef0123456789",
+    );
+
+    const delivery = await executeAddAndReadDelivery({
+      callId: "call-line-direct-no-context-81628",
+      agentSessionKey: sessionKey,
+    });
+
+    expect(delivery?.to).toBeUndefined();
+  });
+
   it("does not let current delivery context override explicit delivery targets", async () => {
     expect(
       await executeAddAndReadDelivery({
diff --git a/src/agents/tools/cron-tool.ts b/src/agents/tools/cron-tool.ts
index 726b83f1574..f7e186941a2 100644
--- a/src/agents/tools/cron-tool.ts
+++ b/src/agents/tools/cron-tool.ts
@@ -581,6 +581,16 @@ function inferDeliveryFromSessionKey(agentSessionKey?: string): CronDelivery | n
     channel = normalizeOptionalLowercaseString(parts[0]) as CronMessageChannel | undefined;
   }
 
+  // LINE chat ids are case-sensitive (push requires capital C/U/R) but the
+  // session key holds the peer id lowercased for canonical routing. Rebuilding
+  // `to` from the session-key fragment would yield a value LINE rejects with
+  // HTTP 400, so refuse the fallback for LINE and let the caller surface the
+  // missing target instead of silently scheduling an undeliverable job.
+  // openclaw/openclaw#81628
+  if (channel === "line") {
+    return null;
+  }
+
   const marker = parts[markerIndex];
   const delivery: CronDelivery = { mode: "announce", to: peerId };
   if (channel) {