diff --git a/packages/react/src/api/AssistantRuntime.ts b/packages/react/src/api/AssistantRuntime.ts
index 1b14d4edd..0856a944c 100644
--- a/packages/react/src/api/AssistantRuntime.ts
+++ b/packages/react/src/api/AssistantRuntime.ts
@@ -13,17 +13,37 @@ import {
 } from "./ThreadManagerRuntime";
 
 export type AssistantRuntime = {
+  /**
+   * The currently selected main thread.
+   */
   thread: ThreadRuntime;
+
+  /**
+   * The thread manager, to rename, archive and delete threads.
+   */
   threadManager: ThreadManagerRuntime;
 
+  /**
+   * Switch to a new thread.
+   */
   switchToNewThread(): void;
 
+  /**
+   * Switch to a thread.
+   *
+   * @param threadId The thread ID to switch to.
+   */
   switchToThread(threadId: string): void;
   /**
    * @deprecated Use `switchToNewThread` instead. This will be removed in 0.6.0.
    */
   switchToThread(threadId: string | null): void;
 
+  /**
+   * Register a model config provider. Model config providers are configuration such as system message, temperature, etc. that are set in the frontend.
+   *
+   * @param provider The model config provider to register.
+   */
   registerModelConfigProvider(provider: ModelConfigProvider): Unsubscribe;
 
   /**
diff --git a/packages/react/src/api/ThreadRuntime.ts b/packages/react/src/api/ThreadRuntime.ts
index 4d2a00e1c..554ed6077 100644
--- a/packages/react/src/api/ThreadRuntime.ts
+++ b/packages/react/src/api/ThreadRuntime.ts
@@ -77,12 +77,38 @@ export type ThreadRuntimeCoreBinding = SubscribableWithState<
 };
 
 export type ThreadState = Readonly<{
+  /**
+   * The thread ID.
+   */
   threadId: string;
+  /**
+   * Whether the thread is disabled. Disabled threads cannot receive new messages.
+   */
   isDisabled: boolean;
+
+  /**
+   * Whether the thread is running. A thread is considered running when there is an active stream connection to the backend.
+   */
   isRunning: boolean;
+
+  /**
+   * The capabilities of the thread, such as whether the thread supports editing, branch switching, etc.
+   */
   capabilities: RuntimeCapabilities;
+
+  /**
+   * The messages in the currently selected branch of the thread.
+   */
   messages: readonly ThreadMessage[];
+
+  /**
+   * Follow up message suggestions to show the user.
+   */
   suggestions: readonly ThreadSuggestion[];
+
+  /**
+   * Custom extra information provided by the runtime.
+   */
   extras: unknown;
 
   /**