feat(tui): allow backgrounding synchronous subagents (#30488)

packages/sdk/js/src/v2/gen/sdk.gen.ts

@@ -44,6 +44,8 @@ import type {
   ExperimentalProjectCopyRemoveResponses,
   ExperimentalResourceListErrors,
   ExperimentalResourceListResponses,
+  ExperimentalSessionBackgroundErrors,
+  ExperimentalSessionBackgroundResponses,
   ExperimentalSessionListErrors,
   ExperimentalSessionListResponses,
   ExperimentalWorkspaceAdapterListErrors,
@@ -733,6 +735,42 @@ export class Session extends HeyApiClient {
       ...params,
     })
   }
+
+  /**
+   * Background subagents
+   *
+   * Detach any synchronous subagents currently blocking the session and continue them in the background.
+   */
+  public background<ThrowOnError extends boolean = false>(
+    parameters: {
+      sessionID: string
+      directory?: string
+      workspace?: string
+    },
+    options?: Options<never, ThrowOnError>,
+  ) {
+    const params = buildClientParams(
+      [parameters],
+      [
+        {
+          args: [
+            { in: "path", key: "sessionID" },
+            { in: "query", key: "directory" },
+            { in: "query", key: "workspace" },
+          ],
+        },
+      ],
+    )
+    return (options?.client ?? this.client).post<
+      ExperimentalSessionBackgroundResponses,
+      ExperimentalSessionBackgroundErrors,
+      ThrowOnError
+    >({
+      url: "/experimental/session/{sessionID}/background",
+      ...options,
+      ...params,
+    })
+  }
 }
 
 export class Resource extends HeyApiClient {

packages/sdk/js/src/v2/gen/types.gen.ts

@@ -5850,6 +5850,38 @@ export type ExperimentalSessionListResponses = {
 
 export type ExperimentalSessionListResponse = ExperimentalSessionListResponses[keyof ExperimentalSessionListResponses]
 
+export type ExperimentalSessionBackgroundData = {
+  body?: never
+  path: {
+    sessionID: string
+  }
+  query?: {
+    directory?: string
+    workspace?: string
+  }
+  url: "/experimental/session/{sessionID}/background"
+}
+
+export type ExperimentalSessionBackgroundErrors = {
+  /**
+   * BadRequest | InvalidRequestError
+   */
+  400: EffectHttpApiErrorBadRequest | InvalidRequestError
+}
+
+export type ExperimentalSessionBackgroundError =
+  ExperimentalSessionBackgroundErrors[keyof ExperimentalSessionBackgroundErrors]
+
+export type ExperimentalSessionBackgroundResponses = {
+  /**
+   * Backgrounded subagents
+   */
+  200: boolean
+}
+
+export type ExperimentalSessionBackgroundResponse =
+  ExperimentalSessionBackgroundResponses[keyof ExperimentalSessionBackgroundResponses]
+
 export type ExperimentalResourceListData = {
   body?: never
   path?: never