fix(mobile): reuse desktop adapter defaults

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

Author: richardsolomou

apps/mobile/src/app/task/[id].tsx

@@ -1,5 +1,8 @@
 import { Text } from "@components/text";
-import { DEFAULT_CLAUDE_EXECUTION_MODE } from "@posthog/core/sessions/executionModes";
+import {
+  DEFAULT_CLAUDE_EXECUTION_MODE,
+  getDefaultExecutionModeForAdapter,
+} from "@posthog/core/sessions/executionModes";
 import {
   countUserMessages,
   getSessionActivityPhase,
@@ -172,6 +175,7 @@ export default function TaskDetailScreen() {
   >();
   const composerAdapter: Adapter =
     task?.latest_run?.runtime_adapter &&
+    !session?.terminalStatus &&
     composerConfig?.adapter !== task.latest_run.runtime_adapter
       ? task.latest_run.runtime_adapter
       : (composerConfig?.adapter ??
@@ -534,7 +538,7 @@ export default function TaskDetailScreen() {
       if (!taskId) return;
       setComposerConfig(taskId, {
         adapter: value,
-        mode: DEFAULT_CLAUDE_EXECUTION_MODE,
+        mode: getDefaultExecutionModeForAdapter(value),
         model: value === "codex" ? DEFAULT_CODEX_MODEL : DEFAULT_GATEWAY_MODEL,
         reasoning: DEFAULT_REASONING_EFFORT,
       });

apps/mobile/src/app/task/index.tsx

@@ -2,6 +2,7 @@ import { Text } from "@components/text";
 import {
   DEFAULT_CLAUDE_EXECUTION_MODE,
   getAvailableModesForAdapter,
+  getDefaultExecutionModeForAdapter,
 } from "@posthog/core/sessions/executionModes";
 import {
   type Adapter,
@@ -799,7 +800,7 @@ export default function NewTaskScreen() {
             const nextAdapter: Adapter =
               adapter === "claude" ? "codex" : "claude";
             setAdapter(nextAdapter);
-            setMode(DEFAULT_CLAUDE_EXECUTION_MODE);
+            setMode(getDefaultExecutionModeForAdapter(nextAdapter));
             setModel(
               nextAdapter === "codex"
                 ? DEFAULT_CODEX_MODEL

apps/mobile/src/features/tasks/composer/TaskChatComposer.tsx

@@ -2,6 +2,7 @@ import { Text } from "@components/text";
 import {
   DEFAULT_CLAUDE_EXECUTION_MODE,
   getAvailableModesForAdapter,
+  getDefaultExecutionModeForAdapter,
 } from "@posthog/core/sessions/executionModes";
 import {
   type Adapter,
@@ -451,7 +452,9 @@ export function TaskChatComposer({
         value={model}
         onChange={(v) => {
           if (v === SWITCH_ADAPTER_VALUE) {
-            onAdapterChange(adapter === "claude" ? "codex" : "claude");
+            const nextAdapter = adapter === "claude" ? "codex" : "claude";
+            onAdapterChange(nextAdapter);
+            onModeChange(getDefaultExecutionModeForAdapter(nextAdapter));
             return;
           }
           const next = resolveComposerModelChange({

packages/core/src/sessions/cloudSessionConfig.ts

@@ -1,9 +1,8 @@
 import type { SessionConfigOption } from "@agentclientprotocol/sdk";
 import type { Adapter, StoredLogEntry } from "@posthog/shared";
 import {
-  DEFAULT_CLAUDE_EXECUTION_MODE,
-  getAvailableCodexModes,
-  getAvailableModes,
+  getAvailableModesForAdapter,
+  getDefaultExecutionModeForAdapter,
 } from "./executionModes";
 
 /**
@@ -56,10 +55,8 @@ export function buildCloudDefaultConfigOptions(
   adapter: Adapter = "claude",
   extra: SessionConfigOption[] = [],
 ): SessionConfigOption[] {
-  const modes =
-    adapter === "codex" ? getAvailableCodexModes() : getAvailableModes();
-  const fallbackMode =
-    adapter === "codex" ? "auto" : DEFAULT_CLAUDE_EXECUTION_MODE;
+  const modes = getAvailableModesForAdapter(adapter);
+  const fallbackMode = getDefaultExecutionModeForAdapter(adapter);
   const currentMode =
     typeof initialMode === "string" &&
     modes.some((mode) => mode.id === initialMode)

packages/core/src/sessions/executionModes.test.ts

@@ -1,5 +1,8 @@
 import { describe, expect, it } from "vitest";
-import { getAvailableModesForAdapter } from "./executionModes";
+import {
+  getAvailableModesForAdapter,
+  getDefaultExecutionModeForAdapter,
+} from "./executionModes";
 
 describe("getAvailableModesForAdapter", () => {
   it.each([
@@ -11,3 +14,12 @@ describe("getAvailableModesForAdapter", () => {
     );
   });
 });
+
+describe("getDefaultExecutionModeForAdapter", () => {
+  it.each([
+    ["claude", "plan"],
+    ["codex", "auto"],
+  ] as const)("returns the desktop default for %s", (adapter, expected) => {
+    expect(getDefaultExecutionModeForAdapter(adapter)).toBe(expected);
+  });
+});

packages/core/src/sessions/executionModes.ts

@@ -7,7 +7,6 @@ export interface ModeInfo {
 }
 
 export const DEFAULT_CLAUDE_EXECUTION_MODE: ExecutionMode = "plan";
-export const DEFAULT_CODEX_EXECUTION_MODE: ExecutionMode = "plan";
 
 const availableModes: ModeInfo[] = [
   {
@@ -53,3 +52,9 @@ export function getAvailableModesForAdapter(
 ): ModeInfo[] {
   return adapter === "codex" ? getAvailableCodexModes() : getAvailableModes();
 }
+
+export function getDefaultExecutionModeForAdapter(
+  adapter: "claude" | "codex",
+): ExecutionMode {
+  return adapter === "codex" ? "auto" : DEFAULT_CLAUDE_EXECUTION_MODE;
+}