diff --git a/.changeset/fuzzy-toasts-return.md b/.changeset/fuzzy-toasts-return.md
new file mode 100644
index 0000000000..d9f889c3f0
--- /dev/null
+++ b/.changeset/fuzzy-toasts-return.md
@@ -0,0 +1,5 @@
+---
+"@cloudflare/kumo": patch
+---
+
+Correct Toast manager usage guidance and preserve typed return values from `add`, `update`, and `promise`.
diff --git a/packages/kumo/ai/USAGE.md b/packages/kumo/ai/USAGE.md
index c5f32da522..4d306fcb91 100644
--- a/packages/kumo/ai/USAGE.md
+++ b/packages/kumo/ai/USAGE.md
@@ -68,7 +68,7 @@ import { Button, Input, Dialog } from "@cloudflare/kumo";
 | `Table`            | Display    | Data table with selection             | `.Header`, `.Head`, `.Body`, `.Row`, `.Cell`, `.Footer`, `.CheckCell`, `.CheckHead`, `.ResizeHandle`; `layout`: auto, fixed    |
 | `Tabs`             | Navigation | Tabbed navigation                     | `tabs: { value, label, render? }[]`; `variant`: segmented, underline; `value`, `onValueChange`                                 |
 | `Text`             | Display    | Themed text with semantic variants    | `variant`: heading1, heading2, heading3, body, secondary, success, error, mono, mono-secondary; `size`: xs, sm, base, lg; `as` |
-| `Toast` / `Toasty` | Feedback   | Toast notification system             | Wrap app with `<Toasty>`, use `Toast.useToastManager().notify()`                                                               |
+| `Toast` / `Toasty` | Feedback   | Toast notification system             | Wrap app with `<Toasty>`, use `Toast.useToastManager().add()`                                                                  |
 | `Tooltip`          | Overlay    | Hover/focus tooltip                   | `content`, `side`, `align`, `asChild`                                                                                          |
 
 ## Semantic Token Reference
diff --git a/packages/kumo/src/components/toast/toast.test.tsx b/packages/kumo/src/components/toast/toast.test.tsx
index 56940ba42a..59bfbd8d22 100644
--- a/packages/kumo/src/components/toast/toast.test.tsx
+++ b/packages/kumo/src/components/toast/toast.test.tsx
@@ -4,6 +4,26 @@ import { useEffect } from "react";
 import { Toasty, createKumoToastManager, useKumoToastManager } from "./toast";
 
 describe("Toasty", () => {
+  it("preserves toast manager return values", async () => {
+    const mgr = createKumoToastManager();
+
+    const id = mgr.add({ id: "return-types", title: "Created" });
+    expect(id).toBe("return-types");
+
+    const updateResult = mgr.update(id, { title: "Updated" });
+    expect(updateResult).toBeUndefined();
+
+    const sourcePromise = Promise.resolve({ status: "complete" });
+    const returnedPromise = mgr.promise(sourcePromise, {
+      loading: { title: "Loading" },
+      success: (result) => ({ title: result.status }),
+      error: { title: "Failed" },
+    });
+
+    expect(returnedPromise).toBe(sourcePromise);
+    await expect(returnedPromise).resolves.toEqual({ status: "complete" });
+  });
+
   // Regression guard: existing callers that don't pass `toastManager`
   // must continue to work via the in-tree `useKumoToastManager` hook.
   it("renders without a toastManager prop and accepts in-tree dispatch", async () => {
diff --git a/packages/kumo/src/components/toast/toast.tsx b/packages/kumo/src/components/toast/toast.tsx
index 812298fc04..1476b96fa5 100644
--- a/packages/kumo/src/components/toast/toast.tsx
+++ b/packages/kumo/src/components/toast/toast.tsx
@@ -1,7 +1,8 @@
 import {
   Toast,
-  ToastManagerAddOptions,
-  ToastObject,
+  type ToastManager,
+  type ToastManagerAddOptions,
+  type ToastObject,
 } from "@base-ui/react/toast";
 import type React from "react";
 import { cn } from "../../utils/cn";
@@ -139,7 +140,7 @@ export function toastVariants({
  * Toasty component props.
  *
  * Wrap your app with `<Toasty>` to enable toast notifications.
- * Use `Toast.useToastManager().notify(…)` to create toasts.
+ * Use `Toast.useToastManager().add(…)` to create toasts.
  *
  * @example
  * ```tsx
@@ -150,7 +151,7 @@ export function toastVariants({
  *
  * // 2. Show a toast from any child component
  * const toasts = Toast.useToastManager();
- * toasts.notify({ title: "Saved", description: "Changes saved successfully." });
+ * toasts.add({ title: "Saved", description: "Changes saved successfully." });
  * ```
  *
  * @example Dispatching toasts from non-React-component code
@@ -204,38 +205,76 @@ export type KumoToastOptions<Data extends object> = ToastObject<Data> &
 export type KumoToastManagerAddOptions<Data extends object> =
   ToastManagerAddOptions<Data> & KumoToastOptionsBase;
 
-function wrapManagerMethods<
-  T extends { add: Function; update: Function; promise: Function },
->(manager: T) {
+type KumoToastManagerMethods = {
+  add: <Data extends object = any>(
+    options: KumoToastManagerAddOptions<Data>,
+  ) => string;
+  update: <Data extends object = any>(
+    id: string,
+    options: Partial<KumoToastManagerAddOptions<Data>>,
+  ) => void;
+  promise: <Value, Data extends object = any>(
+    promise: Promise<Value>,
+    options: {
+      loading: KumoToastManagerAddOptions<Data>;
+      success:
+        | KumoToastManagerAddOptions<Data>
+        | ((data: Value) => KumoToastManagerAddOptions<Data>);
+      error:
+        | KumoToastManagerAddOptions<Data>
+        | ((error: Error) => KumoToastManagerAddOptions<Data>);
+    },
+  ) => Promise<Value>;
+};
+
+type BaseToastManagerMethods = Pick<
+  ToastManager,
+  keyof KumoToastManagerMethods
+>;
+
+type WrappedToastManager<Manager extends BaseToastManagerMethods> = Manager &
+  KumoToastManagerMethods;
+
+function wrapManagerMethods<Manager extends BaseToastManagerMethods>(
+  manager: Manager,
+): WrappedToastManager<Manager> {
   return {
     ...manager,
 
-    add: (options: KumoToastManagerAddOptions<any>) => {
-      if (options.id) {
+    add: <Data extends object = any>(
+      options: KumoToastManagerAddOptions<Data>,
+    ): string => {
+      const id = options.id;
+
+      if (id) {
         const toasts = (manager as any).toasts as
           Array<ToastObject<any>> | undefined;
 
         if (toasts) {
-          const existingToast = toasts.find((toast) => toast.id === options.id);
+          const existingToast = toasts.find((toast) => toast.id === id);
 
           // If toast exists and is not exiting, trigger bump and prevent duplicate
           if (existingToast && existingToast.transitionStatus !== "ending") {
             // Reset animation by disabling then re-enabling
-            manager.update(options.id, { bump: false });
+            const resetBump: Partial<KumoToastManagerAddOptions<Data>> = {
+              bump: false,
+            };
+            manager.update(id, resetBump);
             requestAnimationFrame(() => {
-              manager.update(options.id, {
+              const restartBump: Partial<KumoToastManagerAddOptions<Data>> = {
                 bump: true,
                 ...(options.timeout !== undefined && {
                   timeout: options.timeout,
                 }),
-              });
+              };
+              manager.update(id, restartBump);
             });
-            return options.id;
+            return id;
           }
 
           // If toast exists and is exiting, let it finish - don't add duplicate
           if (existingToast && existingToast.transitionStatus === "ending") {
-            return options.id;
+            return id;
           }
         }
       }
@@ -245,33 +284,36 @@ function wrapManagerMethods<
       });
     },
 
-    update: (id: string, options: Partial<KumoToastManagerAddOptions<any>>) => {
+    update: <Data extends object = any>(
+      id: string,
+      options: Partial<KumoToastManagerAddOptions<Data>>,
+    ): void => {
       return manager.update(id, {
         ...options,
       });
     },
 
-    promise: <T,>(
-      promise: Promise<T>,
+    promise: <Value, Data extends object = any>(
+      promise: Promise<Value>,
       options: {
-        loading: KumoToastManagerAddOptions<any>;
+        loading: KumoToastManagerAddOptions<Data>;
         success:
-          | KumoToastManagerAddOptions<any>
-          | ((data: T) => KumoToastManagerAddOptions<any>);
+          | KumoToastManagerAddOptions<Data>
+          | ((data: Value) => KumoToastManagerAddOptions<Data>);
         error:
-          | KumoToastManagerAddOptions<any>
-          | ((error: Error) => KumoToastManagerAddOptions<any>);
+          | KumoToastManagerAddOptions<Data>
+          | ((error: Error) => KumoToastManagerAddOptions<Data>);
       },
-    ) => {
+    ): Promise<Value> => {
       return manager.promise(promise, {
         loading: { ...options.loading },
         success:
           typeof options.success === "function"
-            ? (data: T) => ({
+            ? (data: Value) => ({
                 ...(
                   options.success as (
-                    data: T,
-                  ) => KumoToastManagerAddOptions<any>
+                    data: Value,
+                  ) => KumoToastManagerAddOptions<Data>
                 )(data),
               })
             : { ...options.success },
@@ -281,7 +323,7 @@ function wrapManagerMethods<
                 ...(
                   options.error as (
                     error: Error,
-                  ) => KumoToastManagerAddOptions<any>
+                  ) => KumoToastManagerAddOptions<Data>
                 )(error),
               })
             : { ...options.error },
diff --git a/packages/kumo/src/components/toast/toast.type-spec.ts b/packages/kumo/src/components/toast/toast.type-spec.ts
new file mode 100644
index 0000000000..d608f09ee0
--- /dev/null
+++ b/packages/kumo/src/components/toast/toast.type-spec.ts
@@ -0,0 +1,36 @@
+import { expectTypeOf } from "vite-plus/test";
+import { createKumoToastManager, useKumoToastManager } from "./toast";
+
+const sourcePromise = Promise.resolve({ status: "complete" as const });
+
+function assertManagerReturnTypes(
+  manager:
+    | ReturnType<typeof createKumoToastManager>
+    | ReturnType<typeof useKumoToastManager>,
+) {
+  expectTypeOf(manager.add({ title: "Created" })).toEqualTypeOf<string>();
+  expectTypeOf(
+    manager.update("toast-id", { title: "Updated" }),
+  ).toEqualTypeOf<void>();
+
+  const returnedPromise = manager.promise(sourcePromise, {
+    loading: { title: "Loading" },
+    success: (result) => {
+      expectTypeOf(result).toEqualTypeOf<{ status: "complete" }>();
+      return { title: result.status };
+    },
+    error: { title: "Failed" },
+  });
+
+  expectTypeOf(returnedPromise).toEqualTypeOf<
+    Promise<{ status: "complete" }>
+  >();
+}
+
+export function assertCreatedToastManagerReturnTypes() {
+  assertManagerReturnTypes(createKumoToastManager());
+}
+
+export function useAssertHookToastManagerReturnTypes() {
+  assertManagerReturnTypes(useKumoToastManager());
+}