fix(mobile): validate resumed agent controls

Generated-By: PostHog Code
Task-Id: c1bbe3cf-742b-4b24-bf96-d11a18b4cf22

Author: richardsolomou

apps/mobile/src/features/tasks/stores/taskSessionStore.test.ts

@@ -263,6 +263,8 @@ describe("_resumeCloudRun", () => {
     mockGetTask.mockResolvedValue(
       previousTask({
         branch: "feature",
+        runtime_adapter: "claude",
+        model: "claude-opus-4-8",
         reasoning_effort: "low",
         state: { initial_permission_mode: "acceptEdits" },
       }),
@@ -275,6 +277,7 @@ describe("_resumeCloudRun", () => {
     expect(mockRunTaskInCloud).toHaveBeenCalledWith("t1", {
       branch: "feature",
       runtimeAdapter: "claude",
+      model: "claude-opus-4-8",
       resumeFromRunId: "prev-run",
       pendingUserMessage: "hi",
       reasoningEffort: "low",
@@ -299,7 +302,14 @@ describe("_resumeCloudRun", () => {
 
   it("prefers the composer's current selection over the previous run", async () => {
     useTaskStore.setState({
-      composerConfigByTaskId: { t1: { mode: "plan", reasoning: "max" } },
+      composerConfigByTaskId: {
+        t1: {
+          adapter: "codex",
+          mode: "plan",
+          model: "gpt-5.5",
+          reasoning: "high",
+        },
+      },
     });
     mockGetTask.mockResolvedValue(
       previousTask({
@@ -316,11 +326,32 @@ describe("_resumeCloudRun", () => {
     expect(mockRunTaskInCloud).toHaveBeenCalledWith(
       "t1",
       expect.objectContaining({
-        reasoningEffort: "max",
+        runtimeAdapter: "codex",
+        model: "gpt-5.5",
+        reasoningEffort: "high",
         initialPermissionMode: "plan",
       }),
     );
   });
+
+  it("drops stored reasoning unsupported by the resumed model", async () => {
+    mockGetTask.mockResolvedValue(
+      previousTask({
+        runtime_adapter: "claude",
+        model: "claude-sonnet-4-6",
+        reasoning_effort: "max",
+      }),
+    );
+
+    await useTaskSessionStore
+      .getState()
+      ._resumeCloudRun("t1", "prev-run", "hi");
+
+    expect(mockRunTaskInCloud).toHaveBeenCalledWith(
+      "t1",
+      expect.objectContaining({ reasoningEffort: undefined }),
+    );
+  });
 });
 
 describe("compaction tracking from the log stream", () => {

apps/mobile/src/features/tasks/stores/taskSessionStore.ts

@@ -1,6 +1,8 @@
 import { convertStoredEntriesToPortableSessionEvents } from "@posthog/core/sessions/portableSessionEvents";
 import {
+  type Adapter,
   type CloudTaskUpdatePayload,
+  isSupportedReasoningEffort,
   isTerminalStatus,
   type StoredLogEntry,
   serializeCloudPrompt,
@@ -1187,9 +1189,18 @@ export const useTaskSessionStore = create<TaskSessionStore>((set, get) => ({
 
     const composerConfig =
       useTaskStore.getState().composerConfigByTaskId[taskId];
+    const adapter: Adapter =
+      composerConfig?.adapter ?? previousRun?.runtime_adapter ?? "claude";
+    const model = composerConfig?.model ?? previousRun?.model ?? undefined;
     const previousPermissionMode = previousRun?.state?.initial_permission_mode;
-    const reasoningEffort =
+    const requestedReasoning =
       composerConfig?.reasoning ?? previousRun?.reasoning_effort ?? undefined;
+    const reasoningEffort =
+      model &&
+      requestedReasoning &&
+      isSupportedReasoningEffort(adapter, model, requestedReasoning)
+        ? requestedReasoning
+        : undefined;
     const initialPermissionMode =
       composerConfig?.mode ??
       (typeof previousPermissionMode === "string"
@@ -1198,7 +1209,8 @@ export const useTaskSessionStore = create<TaskSessionStore>((set, get) => ({
 
     const updatedTask = await runTaskInCloud(taskId, {
       branch: previousBranch,
-      runtimeAdapter: "claude",
+      runtimeAdapter: adapter,
+      model,
       resumeFromRunId: previousRunId,
       pendingUserMessage: prompt,
       reasoningEffort,