diff --git a/apps/mobile/src/features/settings/SettingsScheduledTasksRouteScreen.tsx b/apps/mobile/src/features/settings/SettingsScheduledTasksRouteScreen.tsx
index 2effae896fc6..b3a949e65e59 100644
--- a/apps/mobile/src/features/settings/SettingsScheduledTasksRouteScreen.tsx
+++ b/apps/mobile/src/features/settings/SettingsScheduledTasksRouteScreen.tsx
@@ -37,6 +37,9 @@ import type { ComposerEditorSelection } from "../../components/ComposerEditor";
 import { ScreenScrollView as ScrollView } from "../../components/ScreenScrollView";
 import { SegmentedControl } from "../../components/SegmentedControl";
 import { ThemedSwitch } from "../../components/ThemedSwitch";
+import { webhookAddress } from "@t3tools/client-runtime/webhook-address";
+import { tryCopyTextWithHaptic } from "../../lib/copyTextWithHaptic";
+import { usePreparedConnection } from "../../state/session";
 import { buildModelOptions } from "../../lib/modelOptions";
 import { NativeStackScreenOptions } from "../../native/StackHeader";
 import { useProjects, useEnvironmentServerConfig } from "../../state/entities";
@@ -56,6 +59,7 @@ import { SettingsSection } from "./components/SettingsSection";
 import { useSettingsEnvironmentFilter, type SettingsTarget } from "./settings-environment-filter";
 import {
   editDraft,
+  DEFAULT_WEBHOOK_PROMPT,
   scheduledTaskDefaultModel,
   scheduleFromDraft,
   type ScheduledTaskDraft as Draft,
@@ -599,7 +603,14 @@ function TaskForm({
       environmentUnavailable
     )
       return;
-    const schedule = scheduleFromDraft(draft.schedule);
+    // Signatures are edited on desktop and web; send the task's current one,
+    // not the copy taken when this form opened, so a newer edit survives.
+    const liveTask = tasks.data?.tasks.find((task) => task.id === draft.task?.id);
+    const schedule = scheduleFromDraft(
+      draft.schedule.mode === "webhook" && liveTask?.schedule.type === "webhook"
+        ? { ...draft.schedule, signature: liveTask.schedule.signature }
+        : draft.schedule,
+    );
     if (
       !draft.title.trim() ||
       !draft.prompt.trim() ||
@@ -811,12 +822,20 @@ function TaskForm({
           <SegmentedControl
             options={[
               { value: "fixed_time", label: "At a time" },
-              { value: "interval", label: "Every interval" },
+              { value: "interval", label: "Interval" },
+              { value: "webhook", label: "Webhook" },
             ]}
             selected={draft.schedule.mode}
             onSelect={(mode) => {
               setTimePickerOpen(false);
-              setDraft({ ...draft, schedule: { ...draft.schedule, mode } });
+              setDraft({
+                ...draft,
+                prompt:
+                  mode === "webhook" && !draft.prompt.trim()
+                    ? DEFAULT_WEBHOOK_PROMPT
+                    : draft.prompt,
+                schedule: { ...draft.schedule, mode },
+              });
             }}
           />
         </View>
@@ -890,6 +909,14 @@ function TaskForm({
               }}
             />
           </>
+        ) : draft.schedule.mode === "webhook" ? (
+          <WebhookScheduleDetails
+            environmentId={environmentId}
+            task={
+              tasks.data?.tasks.find((task) => task.id === draft.task?.id) ?? draft.task ?? null
+            }
+            signatureConfigured={draft.schedule.signature !== null}
+          />
         ) : (
           <>
             <FormField
@@ -945,6 +972,90 @@ function TaskForm({
   );
 }
 
+function WebhookScheduleDetails({
+  environmentId,
+  task,
+  signatureConfigured,
+}: {
+  readonly environmentId: EnvironmentId;
+  readonly task: ScheduledTask | null;
+  readonly signatureConfigured: boolean;
+}) {
+  const rotate = useAtomCommand(serverEnvironment.rotateScheduledTaskWebhookToken, {
+    label: "scheduled task rotate webhook token",
+    reportFailure: false,
+  });
+  const preparedConnection = usePreparedConnection(environmentId);
+  const httpBaseUrl =
+    preparedConnection._tag === "Some" ? preparedConnection.value.httpBaseUrl : null;
+  const webhook = task?.schedule.type === "webhook" ? task.webhook : undefined;
+  // Without T3 Connect, the path is resolved on the address this phone uses.
+  const resolved = webhook ? webhookAddress(webhook, httpBaseUrl) : null;
+  return (
+    <View className="gap-2 border-t border-border-subtle px-4 py-3">
+      <Text className="text-sm text-foreground-muted">
+        {
+          "The prompt can use {{body.a.b}}, {{headers.name}}, {{query.name}}, {{body}} and {{request}}. The filled-in prompt is all the agent sees."
+        }
+      </Text>
+      {task === null || resolved === null ? (
+        <Text className="text-sm text-foreground-muted">Save the task to get its webhook URL.</Text>
+      ) : (
+        <>
+          <Pressable
+            accessibilityRole="button"
+            accessibilityLabel="Copy webhook URL"
+            accessibilityHint="Copies the URL to the clipboard"
+            // A bare path is not something a sender can call, so only full URLs copy.
+            disabled={!resolved.copyable}
+            onPress={() => void tryCopyTextWithHaptic(resolved.address)}
+            className="gap-1 active:opacity-70"
+          >
+            <Text className="text-lg text-foreground">
+              {resolved.copyable ? "Webhook URL" : "Webhook path"}
+            </Text>
+            <Text className="text-sm text-foreground-muted" numberOfLines={2} selectable>
+              {resolved.address}
+            </Text>
+          </Pressable>
+          {resolved.note !== null ? (
+            <Text className="text-sm text-foreground-muted">{resolved.note}</Text>
+          ) : null}
+          <Pressable
+            accessibilityRole="button"
+            onPress={() =>
+              Alert.alert("Rotate URL?", "The current URL stops working immediately.", [
+                { text: "Cancel", style: "cancel" },
+                {
+                  text: "Rotate",
+                  style: "destructive",
+                  onPress: () =>
+                    void rotate({ environmentId, input: { id: task.id } }).then((result) => {
+                      if (result._tag === "Failure" && !isAtomCommandInterrupted(result)) {
+                        Alert.alert(
+                          "Could not rotate URL",
+                          String(squashAtomCommandFailure(result)),
+                        );
+                      }
+                    }),
+                },
+              ])
+            }
+            className="min-h-11 justify-center active:opacity-70"
+          >
+            <Text className="text-base text-danger-foreground">Rotate URL</Text>
+          </Pressable>
+        </>
+      )}
+      {signatureConfigured ? (
+        <Text className="text-sm text-foreground-muted">
+          Signature check configured on desktop/web.
+        </Text>
+      ) : null}
+    </View>
+  );
+}
+
 function EnvironmentTasks({
   environment,
   now,
@@ -1025,8 +1136,6 @@ function EnvironmentTasks({
             <Pressable
               accessibilityRole="button"
               accessibilityLabel={`Edit ${task.title}`}
-              // Webhook tasks are not editable here yet; saving would drop their URL.
-              disabled={task.schedule.type === "webhook"}
               onPress={() => {
                 onEdit(task);
               }}
@@ -1051,9 +1160,10 @@ function EnvironmentTasks({
             </Pressable>
             <ControlPillMenu
               actions={[
-                ...(task.schedule.type === "webhook" ? [] : [{ id: "edit", title: "Edit" }]),
+                { id: "edit", title: "Edit" },
                 { id: "toggle", title: task.enabled ? "Pause" : "Resume" },
-                { id: "run", title: "Run now" },
+                // A webhook task has no request to run without.
+                ...(task.schedule.type === "webhook" ? [] : [{ id: "run", title: "Run now" }]),
                 { id: "delete", title: "Delete", attributes: { destructive: true } },
               ]}
               onPressAction={({ nativeEvent }) => {
diff --git a/apps/mobile/src/features/settings/scheduledTaskDraft.test.ts b/apps/mobile/src/features/settings/scheduledTaskDraft.test.ts
index 01961597c3ad..022a357404ed 100644
--- a/apps/mobile/src/features/settings/scheduledTaskDraft.test.ts
+++ b/apps/mobile/src/features/settings/scheduledTaskDraft.test.ts
@@ -28,6 +28,25 @@ describe("scheduleDraftForTask", () => {
     const schedule = { type: "interval" as const, everyMs: 65_000 };
     expect(scheduleFromDraft(scheduleDraftForTask({ schedule }))).toEqual(schedule);
   });
+
+  it("round-trips a webhook schedule without a signature", () => {
+    const draft = scheduleDraftForTask({ schedule: { type: "webhook", signature: null } });
+    expect(draft.mode).toBe("webhook");
+    expect(scheduleFromDraft(draft)).toEqual({ type: "webhook", signature: null });
+  });
+
+  it("keeps a webhook signature on save without sending a secret", () => {
+    const signature = {
+      header: "x-hub-signature-256",
+      encoding: "hex" as const,
+      prefix: "sha256=",
+    };
+    const saved = scheduleFromDraft(
+      scheduleDraftForTask({ schedule: { type: "webhook", signature } }),
+    );
+    expect(saved).toEqual({ type: "webhook", signature });
+    expect(saved?.type === "webhook" && saved.signature && "secret" in saved.signature).toBe(false);
+  });
 });
 
 describe("hasScheduledTaskDraftChanges", () => {
diff --git a/apps/mobile/src/features/settings/scheduledTaskDraft.ts b/apps/mobile/src/features/settings/scheduledTaskDraft.ts
index 9ec77b585ac8..2843700620e8 100644
--- a/apps/mobile/src/features/settings/scheduledTaskDraft.ts
+++ b/apps/mobile/src/features/settings/scheduledTaskDraft.ts
@@ -5,6 +5,7 @@ import type {
   RuntimeMode,
   ScheduledTask,
   ScheduledTaskUpsertSchedule,
+  ScheduledTaskWebhookSignature,
 } from "@t3tools/contracts";
 
 import { DEFAULT_SERVER_SETTINGS } from "@t3tools/contracts";
@@ -37,10 +38,12 @@ export function scheduledTaskDefaultModel(
 }
 
 export type ScheduleDraft = {
-  readonly mode: "fixed_time" | "interval";
+  readonly mode: "fixed_time" | "interval" | "webhook";
   readonly timeOfDay: string;
   readonly weekdays: ReadonlyArray<number>;
   readonly intervalMinutes: string;
+  /** A webhook signature check configured elsewhere; mobile keeps it but does not edit it. */
+  readonly signature: ScheduledTaskWebhookSignature | null;
 };
 
 export const DEFAULT_SCHEDULE: ScheduleDraft = {
@@ -48,27 +51,48 @@ export const DEFAULT_SCHEDULE: ScheduleDraft = {
   timeOfDay: "09:00",
   weekdays: [1, 2, 3, 4, 5],
   intervalMinutes: "15",
+  signature: null,
 };
 
+/** Prompt a new webhook task starts with: the whole request, which the user can narrow down. */
+export const DEFAULT_WEBHOOK_PROMPT = "Handle this webhook:\n{{request}}";
+
 export function scheduleDraftForTask(task: Pick<ScheduledTask, "schedule">): ScheduleDraft {
-  // Webhook tasks cannot be edited here yet; show them as the default schedule.
-  if (task.schedule.type === "webhook") return DEFAULT_SCHEDULE;
-  return task.schedule.type === "fixed_time"
-    ? {
+  switch (task.schedule.type) {
+    case "fixed_time":
+      return {
         ...DEFAULT_SCHEDULE,
         timeOfDay: task.schedule.timeOfDay,
         weekdays: task.schedule.weekdays?.length
           ? [...new Set(task.schedule.weekdays)].sort((a, b) => a - b)
           : [0, 1, 2, 3, 4, 5, 6],
-      }
-    : {
+      };
+    case "interval":
+      return {
         ...DEFAULT_SCHEDULE,
         mode: "interval",
         intervalMinutes: String(Math.max(1, task.schedule.everyMs / 60_000)),
       };
+    case "webhook":
+      return { ...DEFAULT_SCHEDULE, mode: "webhook", signature: task.schedule.signature };
+  }
 }
 
 export function scheduleFromDraft(draft: ScheduleDraft): ScheduledTaskUpsertSchedule | null {
+  if (draft.mode === "webhook") {
+    // No secret is sent, so the server keeps the stored one.
+    return {
+      type: "webhook",
+      signature:
+        draft.signature === null
+          ? null
+          : {
+              header: draft.signature.header,
+              encoding: draft.signature.encoding,
+              prefix: draft.signature.prefix,
+            },
+    };
+  }
   if (draft.mode === "interval") {
     const minutes = Number(draft.intervalMinutes);
     // Undo floating-point noise from displaying existing millisecond intervals as minutes.
diff --git a/packages/client-runtime/package.json b/packages/client-runtime/package.json
index b812495cb3e2..7063fed96ca8 100644
--- a/packages/client-runtime/package.json
+++ b/packages/client-runtime/package.json
@@ -131,6 +131,10 @@
       "types": "./src/textPaste.ts",
       "default": "./src/textPaste.ts"
     },
+    "./webhook-address": {
+      "types": "./src/webhookAddress.ts",
+      "default": "./src/webhookAddress.ts"
+    },
     "./delayed-status": {
       "types": "./src/delayedStatus.ts",
       "default": "./src/delayedStatus.ts"
diff --git a/packages/client-runtime/src/webhookAddress.test.ts b/packages/client-runtime/src/webhookAddress.test.ts
new file mode 100644
index 000000000000..2284ee8fb150
--- /dev/null
+++ b/packages/client-runtime/src/webhookAddress.test.ts
@@ -0,0 +1,36 @@
+import { describe, expect, it } from "vite-plus/test";
+
+import { webhookAddress } from "./webhookAddress.ts";
+
+const path = "/api/hooks/scheduled-task%3Ahook/token";
+const endpoint = (url: string | null) => ({ path, url, hasSecret: false });
+
+describe("webhookAddress", () => {
+  it("uses the T3 Connect URL when the server has one", () => {
+    expect(webhookAddress(endpoint("https://relay.t3.codes/v1/hooks/k/t/x"), null)).toEqual({
+      address: "https://relay.t3.codes/v1/hooks/k/t/x",
+      copyable: true,
+      note: null,
+    });
+  });
+
+  it("builds a direct URL on the environment's address without T3 Connect", () => {
+    const result = webhookAddress(endpoint(null), "https://mac.tail1234.ts.net/");
+    expect(result.address).toBe(`https://mac.tail1234.ts.net${path}`);
+    expect(result.copyable).toBe(true);
+    expect(result.note).toContain("Tailscale");
+  });
+
+  it("says only this computer can call a loopback address", () => {
+    const result = webhookAddress(endpoint(null), "http://127.0.0.1:3773/");
+    expect(result.copyable).toBe(true);
+    expect(result.note).toContain("Only this computer");
+  });
+
+  it("falls back to the path when the address is unknown", () => {
+    expect(webhookAddress(endpoint(null), null)).toMatchObject({
+      address: path,
+      copyable: false,
+    });
+  });
+});
diff --git a/packages/client-runtime/src/webhookAddress.ts b/packages/client-runtime/src/webhookAddress.ts
new file mode 100644
index 000000000000..cd1424fd6f86
--- /dev/null
+++ b/packages/client-runtime/src/webhookAddress.ts
@@ -0,0 +1,40 @@
+import type { ScheduledTaskWebhookEndpoint } from "@t3tools/contracts";
+import { isLocalLoopbackHost } from "@t3tools/shared/hostClassification";
+
+/**
+ * Where a sender can call a webhook task, as a client shows it. With T3
+ * Connect the server returns a public URL; without it the path is resolved on
+ * the address this client reaches the environment at.
+ */
+export interface WebhookAddress {
+  /** The URL to give a sender, or the bare path when no address is known. */
+  readonly address: string;
+  /** Whether `address` is a full URL a sender can call. */
+  readonly copyable: boolean;
+  /** One line on who can reach `address`; null for a T3 Connect URL. */
+  readonly note: string | null;
+}
+
+export function webhookAddress(
+  endpoint: ScheduledTaskWebhookEndpoint,
+  httpBaseUrl: string | null,
+): WebhookAddress {
+  if (endpoint.url !== null) {
+    return { address: endpoint.url, copyable: true, note: null };
+  }
+  if (httpBaseUrl === null) {
+    return {
+      address: endpoint.path,
+      copyable: false,
+      note: "Link this environment to T3 Connect for a public URL.",
+    };
+  }
+  const url = new URL(endpoint.path, httpBaseUrl);
+  return {
+    address: url.href,
+    copyable: true,
+    note: isLocalLoopbackHost(url.hostname)
+      ? "Only this computer can call this address. Link T3 Connect for a public URL."
+      : "Works wherever this environment's address is reachable, for example over Tailscale or your own proxy. Link T3 Connect for a public URL.",
+  };
+}