diff --git a/src/cron/delivery.test.ts b/src/cron/delivery.test.ts
index 43eaa215114..1d2ffd0ac8d 100644
--- a/src/cron/delivery.test.ts
+++ b/src/cron/delivery.test.ts
@@ -84,6 +84,24 @@ describe("resolveCronDeliveryPlan", () => {
     expect(plan.to).toBe("123");
     expect(plan.accountId).toBe("bot-a");
   });
+
+  it("threads delivery.threadId when explicitly configured", () => {
+    const plan = resolveCronDeliveryPlan(
+      makeJob({
+        delivery: {
+          mode: "announce",
+          channel: "telegram",
+          to: "-1003700845925",
+          threadId: " 15 ",
+        },
+      }),
+    );
+    expect(plan.mode).toBe("announce");
+    expect(plan.requested).toBe(true);
+    expect(plan.channel).toBe("telegram");
+    expect(plan.to).toBe("-1003700845925");
+    expect(plan.threadId).toBe("15");
+  });
 });
 
 describe("resolveFailureDestination", () => {
@@ -148,6 +166,33 @@ describe("resolveFailureDestination", () => {
     expect(plan).toBeNull();
   });
 
+  it("keeps failure destinations for topic-routed announce jobs", () => {
+    const plan = resolveFailureDestination(
+      makeJob({
+        delivery: {
+          mode: "announce",
+          channel: "telegram",
+          to: "-1003700845925",
+          threadId: "15",
+          accountId: "bot-a",
+          failureDestination: {
+            mode: "announce",
+            channel: "telegram",
+            to: "-1003700845925",
+            accountId: "bot-a",
+          },
+        },
+      }),
+      undefined,
+    );
+    expect(plan).toEqual({
+      mode: "announce",
+      channel: "telegram",
+      to: "-1003700845925",
+      accountId: "bot-a",
+    });
+  });
+
   it("returns null when webhook failure destination matches the primary webhook target", () => {
     const plan = resolveFailureDestination(
       makeJob({
diff --git a/src/cron/delivery.ts b/src/cron/delivery.ts
index 9d502a74fcb..6347bd87b82 100644
--- a/src/cron/delivery.ts
+++ b/src/cron/delivery.ts
@@ -14,6 +14,8 @@ export type CronDeliveryPlan = {
   mode: CronDeliveryMode;
   channel?: CronMessageChannel;
   to?: string;
+  /** Explicit thread/topic target from the delivery config, if set. */
+  threadId?: string | number;
   /** Explicit channel account id from the delivery config, if set. */
   accountId?: string;
   source: "delivery" | "payload";
@@ -47,6 +49,17 @@ function normalizeAccountId(value: unknown): string | undefined {
   return trimmed ? trimmed : undefined;
 }
 
+function normalizeThreadId(value: unknown): string | number | undefined {
+  if (typeof value === "number" && Number.isFinite(value)) {
+    return value;
+  }
+  if (typeof value !== "string") {
+    return undefined;
+  }
+  const trimmed = value.trim();
+  return trimmed ? trimmed : undefined;
+}
+
 export function resolveCronDeliveryPlan(job: CronJob): CronDeliveryPlan {
   const payload = job.payload.kind === "agentTurn" ? job.payload : null;
   const delivery = job.delivery;
@@ -70,6 +83,9 @@ export function resolveCronDeliveryPlan(job: CronJob): CronDeliveryPlan {
     (delivery as { channel?: unknown } | undefined)?.channel,
   );
   const deliveryTo = normalizeTo((delivery as { to?: unknown } | undefined)?.to);
+  const deliveryThreadId = normalizeThreadId(
+    (delivery as { threadId?: unknown } | undefined)?.threadId,
+  );
   const channel = deliveryChannel ?? payloadChannel ?? "last";
   const to = deliveryTo ?? payloadTo;
   const deliveryAccountId = normalizeAccountId(
@@ -81,6 +97,7 @@ export function resolveCronDeliveryPlan(job: CronJob): CronDeliveryPlan {
       mode: resolvedMode,
       channel: resolvedMode === "announce" ? channel : undefined,
       to,
+      threadId: deliveryThreadId,
       accountId: deliveryAccountId,
       source: "delivery",
       requested: resolvedMode === "announce",
@@ -220,6 +237,7 @@ function isSameDeliveryTarget(
   const primaryChannel = delivery.channel;
   const primaryTo = delivery.to;
   const primaryAccountId = delivery.accountId;
+  const primaryThreadId = normalizeThreadId(delivery.threadId);
 
   if (failurePlan.mode === "webhook") {
     return primaryMode === "webhook" && primaryTo === failurePlan.to;
@@ -229,6 +247,7 @@ function isSameDeliveryTarget(
   const failureChannelNormalized = failurePlan.channel ?? "last";
 
   return (
+    primaryThreadId === undefined &&
     failureChannelNormalized === primaryChannelNormalized &&
     failurePlan.to === primaryTo &&
     failurePlan.accountId === primaryAccountId
diff --git a/src/cron/isolated-agent.delivery-target-thread-session.test.ts b/src/cron/isolated-agent.delivery-target-thread-session.test.ts
index 68413f386b8..73db84e0168 100644
--- a/src/cron/isolated-agent.delivery-target-thread-session.test.ts
+++ b/src/cron/isolated-agent.delivery-target-thread-session.test.ts
@@ -170,4 +170,18 @@ describe("resolveDeliveryTarget thread session lookup", () => {
     expect(result.to).toBe("63448508");
     expect(result.threadId).toBe(1008013);
   });
+
+  it("preserves explicit delivery.threadId when the target chat is plain telegram", async () => {
+    mockStore["/mock/store.json"] = {};
+
+    const result = await resolveDeliveryTarget(cfg, "main", {
+      channel: "telegram",
+      to: "63448508",
+      threadId: "15",
+    });
+
+    expect(result.to).toBe("63448508");
+    expect(result.threadId).toBe("15");
+    expect(result.channel).toBe("telegram");
+  });
 });
diff --git a/src/cron/isolated-agent.delivery.test-helpers.ts b/src/cron/isolated-agent.delivery.test-helpers.ts
index 041f5750a95..ba7641d9311 100644
--- a/src/cron/isolated-agent.delivery.test-helpers.ts
+++ b/src/cron/isolated-agent.delivery.test-helpers.ts
@@ -54,6 +54,7 @@ export async function runTelegramAnnounceTurn(params: {
     mode: "announce";
     channel: string;
     to?: string;
+    threadId?: string | number;
     bestEffort?: boolean;
   };
   deliveryContract?: "cron-owned" | "shared";
diff --git a/src/cron/isolated-agent.direct-delivery-forum-topics.test.ts b/src/cron/isolated-agent.direct-delivery-forum-topics.test.ts
index 0ee64e789fc..e6a2b46b2d8 100644
--- a/src/cron/isolated-agent.direct-delivery-forum-topics.test.ts
+++ b/src/cron/isolated-agent.direct-delivery-forum-topics.test.ts
@@ -12,7 +12,7 @@ import { setupIsolatedAgentTurnMocks } from "./isolated-agent.test-setup.js";
 
 describe("runCronIsolatedAgentTurn forum topic delivery", () => {
   beforeEach(() => {
-    setupIsolatedAgentTurnMocks();
+    setupIsolatedAgentTurnMocks({ fast: true });
   });
 
   it("routes forum-topic telegram targets through the correct delivery path", async () => {
@@ -59,6 +59,30 @@ describe("runCronIsolatedAgentTurn forum topic delivery", () => {
         chatId: "123",
         text: "plain message",
       });
+
+      vi.clearAllMocks();
+      mockAgentPayloads([{ text: "explicit thread message" }]);
+
+      const explicitThreadRes = await runTelegramAnnounceTurn({
+        home,
+        storePath,
+        deps,
+        delivery: {
+          mode: "announce",
+          channel: "telegram",
+          to: "123",
+          threadId: "15",
+        },
+      });
+
+      expect(explicitThreadRes.status).toBe("ok");
+      expect(explicitThreadRes.delivered).toBe(true);
+      expect(runSubagentAnnounceFlow).not.toHaveBeenCalled();
+      expectDirectTelegramDelivery(deps, {
+        chatId: "123",
+        text: "explicit thread message",
+        messageThreadId: 15,
+      });
     });
   });
 });
diff --git a/src/cron/isolated-agent/delivery-target.ts b/src/cron/isolated-agent/delivery-target.ts
index 538ebdca273..590169c9e5e 100644
--- a/src/cron/isolated-agent/delivery-target.ts
+++ b/src/cron/isolated-agent/delivery-target.ts
@@ -43,6 +43,7 @@ export async function resolveDeliveryTarget(
   jobPayload: {
     channel?: "last" | ChannelId;
     to?: string;
+    threadId?: string | number;
     /** Explicit accountId from job.delivery — overrides session-derived and binding-derived values. */
     accountId?: string;
     sessionKey?: string;
@@ -50,6 +51,8 @@ export async function resolveDeliveryTarget(
 ): Promise<DeliveryTargetResolution> {
   const requestedChannel = typeof jobPayload.channel === "string" ? jobPayload.channel : "last";
   const explicitTo = typeof jobPayload.to === "string" ? jobPayload.to : undefined;
+  const explicitThreadId =
+    jobPayload.threadId != null && jobPayload.threadId !== "" ? jobPayload.threadId : undefined;
   const allowMismatchedLastTo = requestedChannel === "last";
 
   const sessionCfg = cfg.session;
@@ -67,6 +70,7 @@ export async function resolveDeliveryTarget(
     entry: main,
     requestedChannel,
     explicitTo,
+    explicitThreadId,
     allowMismatchedLastTo,
   });
 
@@ -93,6 +97,7 @@ export async function resolveDeliveryTarget(
         entry: main,
         requestedChannel,
         explicitTo,
+        explicitThreadId,
         fallbackChannel,
         allowMismatchedLastTo,
         mode: preliminary.mode,
diff --git a/src/cron/isolated-agent/run.ts b/src/cron/isolated-agent/run.ts
index 1a122f56864..96a6b80edeb 100644
--- a/src/cron/isolated-agent/run.ts
+++ b/src/cron/isolated-agent/run.ts
@@ -201,6 +201,7 @@ async function resolveCronDeliveryContext(params: {
   const resolvedDelivery = await resolveDeliveryTarget(params.cfg, params.agentId, {
     channel: deliveryPlan.channel ?? "last",
     to: deliveryPlan.to,
+    threadId: deliveryPlan.threadId,
     accountId: deliveryPlan.accountId,
     sessionKey: params.job.sessionKey,
   });
diff --git a/src/cron/normalize.test.ts b/src/cron/normalize.test.ts
index 969faa6bb6f..0424cf3d02b 100644
--- a/src/cron/normalize.test.ts
+++ b/src/cron/normalize.test.ts
@@ -248,6 +248,21 @@ describe("normalizeCronJobCreate", () => {
     expect(delivery.accountId).toBe("coordinator");
   });
 
+  it("normalizes delivery threadId and strips blanks", () => {
+    const normalized = normalizeIsolatedAgentTurnCreateJob({
+      name: "delivery thread",
+      delivery: {
+        mode: "announce",
+        channel: "telegram",
+        to: "-1003816714067",
+        threadId: " 15 ",
+      },
+    });
+
+    const delivery = normalized.delivery as Record<string, unknown>;
+    expect(delivery.threadId).toBe("15");
+  });
+
   it("strips empty accountId from delivery", () => {
     const normalized = normalizeIsolatedAgentTurnCreateJob({
       name: "empty account",
diff --git a/src/cron/normalize.ts b/src/cron/normalize.ts
index b1afdfaaa12..ebcd65102e3 100644
--- a/src/cron/normalize.ts
+++ b/src/cron/normalize.ts
@@ -193,6 +193,18 @@ function coerceDelivery(delivery: UnknownRecord) {
       delete next.to;
     }
   }
+  if (typeof delivery.threadId === "number" && Number.isFinite(delivery.threadId)) {
+    next.threadId = delivery.threadId;
+  } else if (typeof delivery.threadId === "string") {
+    const trimmed = delivery.threadId.trim();
+    if (trimmed) {
+      next.threadId = trimmed;
+    } else {
+      delete next.threadId;
+    }
+  } else if ("threadId" in next) {
+    delete next.threadId;
+  }
   if (typeof delivery.accountId === "string") {
     const trimmed = delivery.accountId.trim();
     if (trimmed) {
diff --git a/src/cron/service.jobs.test.ts b/src/cron/service.jobs.test.ts
index c514f7528ba..4688aa15c7a 100644
--- a/src/cron/service.jobs.test.ts
+++ b/src/cron/service.jobs.test.ts
@@ -167,6 +167,26 @@ describe("applyJobPatch", () => {
     expect(job.delivery?.accountId).toBeUndefined();
   });
 
+  it("merges delivery.threadId from patch and preserves existing", () => {
+    const job = createIsolatedAgentTurnJob("job-thread", {
+      mode: "announce",
+      channel: "telegram",
+      to: "-100123",
+    });
+
+    applyJobPatch(job, { delivery: { mode: "announce", threadId: " 15 " } });
+    expect(job.delivery?.threadId).toBe("15");
+    expect(job.delivery?.mode).toBe("announce");
+    expect(job.delivery?.to).toBe("-100123");
+
+    applyJobPatch(job, { delivery: { mode: "announce", to: "-100999" } });
+    expect(job.delivery?.threadId).toBe("15");
+    expect(job.delivery?.to).toBe("-100999");
+
+    applyJobPatch(job, { delivery: { mode: "announce", threadId: "" } });
+    expect(job.delivery?.threadId).toBeUndefined();
+  });
+
   it("persists agentTurn payload.lightContext updates when editing existing jobs", () => {
     const job = createIsolatedAgentTurnJob("job-light-context", {
       mode: "announce",
diff --git a/src/cron/service/jobs.ts b/src/cron/service/jobs.ts
index 542ba81053d..3b56e4c8c26 100644
--- a/src/cron/service/jobs.ts
+++ b/src/cron/service/jobs.ts
@@ -780,6 +780,13 @@ function normalizeOptionalTrimmedString(value: unknown): string | undefined {
   return trimmed ? trimmed : undefined;
 }
 
+function normalizeOptionalThreadId(value: unknown): string | number | undefined {
+  if (typeof value === "number" && Number.isFinite(value)) {
+    return value;
+  }
+  return normalizeOptionalTrimmedString(value);
+}
+
 function mergeCronDelivery(
   existing: CronDelivery | undefined,
   patch: CronDeliveryPatch,
@@ -788,6 +795,7 @@ function mergeCronDelivery(
     mode: existing?.mode ?? "none",
     channel: existing?.channel,
     to: existing?.to,
+    threadId: existing?.threadId,
     accountId: existing?.accountId,
     bestEffort: existing?.bestEffort,
     failureDestination: existing?.failureDestination,
@@ -802,6 +810,9 @@ function mergeCronDelivery(
   if ("to" in patch) {
     next.to = normalizeOptionalTrimmedString(patch.to);
   }
+  if ("threadId" in patch) {
+    next.threadId = normalizeOptionalThreadId(patch.threadId);
+  }
   if ("accountId" in patch) {
     next.accountId = normalizeOptionalTrimmedString(patch.accountId);
   }
diff --git a/src/cron/types.ts b/src/cron/types.ts
index 02078d15424..aeee20e0599 100644
--- a/src/cron/types.ts
+++ b/src/cron/types.ts
@@ -24,6 +24,8 @@ export type CronDelivery = {
   mode: CronDeliveryMode;
   channel?: CronMessageChannel;
   to?: string;
+  /** Explicit thread or topic target for threaded channels (for example Telegram forum topics). */
+  threadId?: string | number;
   /** Explicit channel account id for multi-account setups (e.g. multiple Telegram bots). */
   accountId?: string;
   bestEffort?: boolean;
diff --git a/src/gateway/protocol/schema/cron.ts b/src/gateway/protocol/schema/cron.ts
index f61d3e42711..9de5b250022 100644
--- a/src/gateway/protocol/schema/cron.ts
+++ b/src/gateway/protocol/schema/cron.ts
@@ -176,6 +176,7 @@ export const CronFailureDestinationSchema = Type.Object(
 
 const CronDeliverySharedProperties = {
   channel: Type.Optional(Type.Union([Type.Literal("last"), NonEmptyString])),
+  threadId: Type.Optional(Type.Union([Type.String(), Type.Number()])),
   accountId: Type.Optional(NonEmptyString),
   bestEffort: Type.Optional(Type.Boolean()),
   failureDestination: Type.Optional(CronFailureDestinationSchema),
diff --git a/src/gateway/server.cron.test.ts b/src/gateway/server.cron.test.ts
index efdbecba004..ba524697504 100644
--- a/src/gateway/server.cron.test.ts
+++ b/src/gateway/server.cron.test.ts
@@ -375,6 +375,69 @@ describe("gateway server cron", () => {
       expect(merged?.delivery?.channel).toBe("telegram");
       expect(merged?.delivery?.to).toBe("19098680");
 
+      const threadIdRes = await rpcReq(ws, "cron.add", {
+        name: "thread id roundtrip",
+        enabled: true,
+        schedule: { kind: "every", everyMs: 60_000 },
+        sessionTarget: "isolated",
+        wakeMode: "next-heartbeat",
+        payload: { kind: "agentTurn", message: "hello" },
+        delivery: {
+          mode: "announce",
+          channel: "telegram",
+          to: "-1003700845925",
+          threadId: 15,
+        },
+      });
+      expect(threadIdRes.ok).toBe(true);
+      const threadIdAdded = threadIdRes.payload as
+        | {
+            id?: unknown;
+            delivery?: { threadId?: unknown; mode?: unknown; channel?: unknown; to?: unknown };
+          }
+        | undefined;
+      const threadIdJobId = typeof threadIdAdded?.id === "string" ? threadIdAdded.id : "";
+      expect(threadIdJobId.length > 0).toBe(true);
+      expect(threadIdAdded?.delivery?.mode).toBe("announce");
+      expect(threadIdAdded?.delivery?.channel).toBe("telegram");
+      expect(threadIdAdded?.delivery?.to).toBe("-1003700845925");
+      expect(threadIdAdded?.delivery?.threadId).toBe(15);
+
+      const threadIdUpdateRes = await rpcReq(ws, "cron.update", {
+        id: threadIdJobId,
+        patch: {
+          delivery: { threadId: "16" },
+        },
+      });
+      expect(threadIdUpdateRes.ok).toBe(true);
+      const threadIdUpdated = threadIdUpdateRes.payload as
+        | {
+            delivery?: { mode?: unknown; channel?: unknown; to?: unknown; threadId?: unknown };
+          }
+        | undefined;
+      expect(threadIdUpdated?.delivery?.mode).toBe("announce");
+      expect(threadIdUpdated?.delivery?.channel).toBe("telegram");
+      expect(threadIdUpdated?.delivery?.to).toBe("-1003700845925");
+      expect(threadIdUpdated?.delivery?.threadId).toBe("16");
+
+      const threadIdListRes = await rpcReq(ws, "cron.list", {
+        includeDisabled: true,
+        query: "thread id roundtrip",
+      });
+      expect(threadIdListRes.ok).toBe(true);
+      const threadIdJobs = (threadIdListRes.payload as { jobs?: unknown } | null)?.jobs;
+      expect(Array.isArray(threadIdJobs)).toBe(true);
+      const threadIdListed = (
+        threadIdJobs as Array<{
+          id?: unknown;
+          delivery?: { threadId?: unknown; mode?: unknown; channel?: unknown; to?: unknown };
+        }>
+      ).find((job) => job.id === threadIdJobId);
+      expect(threadIdListed?.delivery?.mode).toBe("announce");
+      expect(threadIdListed?.delivery?.channel).toBe("telegram");
+      expect(threadIdListed?.delivery?.to).toBe("-1003700845925");
+      expect(threadIdListed?.delivery?.threadId).toBe("16");
+
       const modelOnlyPatchRes = await rpcReq(ws, "cron.update", {
         id: mergeJobId,
         patch: {