fix(mobile): use canonical Codex config

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

Author: richardsolomou

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

@@ -1,8 +1,6 @@
 import { Text } from "@components/text";
-import {
-  DEFAULT_CLAUDE_EXECUTION_MODE,
-  getDefaultExecutionModeForAdapter,
-} from "@posthog/core/sessions/executionModes";
+import { getCloudReasoningConfigOptionId } from "@posthog/core/sessions/cloudSessionConfig";
+import { getDefaultExecutionModeForAdapter } from "@posthog/core/sessions/executionModes";
 import {
   countUserMessages,
   getSessionActivityPhase,
@@ -187,7 +185,7 @@ export default function TaskDetailScreen() {
       : composerConfig.adapter === composerAdapter;
   const composerMode: ExecutionMode =
     (composerConfigMatchesAdapter ? composerConfig?.mode : undefined) ??
-    DEFAULT_CLAUDE_EXECUTION_MODE;
+    getDefaultExecutionModeForAdapter(composerAdapter);
   const composerModel =
     (composerConfigMatchesAdapter ? composerConfig?.model : undefined) ??
     task?.latest_run?.model ??
@@ -559,10 +557,14 @@ export default function TaskDetailScreen() {
     (value: SupportedReasoningEffort) => {
       if (!taskId) return;
       setComposerConfig(taskId, { reasoning: value });
-      setConfigOption(taskId, "effort", value).catch(() => {});
+      setConfigOption(
+        taskId,
+        getCloudReasoningConfigOptionId(composerAdapter),
+        value,
+      ).catch(() => {});
       usePreferencesStore.getState().setLastUsedReasoningEffort(value);
     },
-    [taskId, setComposerConfig, setConfigOption],
+    [taskId, composerAdapter, setComposerConfig, setConfigOption],
   );
 
   const handleStop = useCallback(() => {

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

@@ -4,6 +4,7 @@ import {
   addMissingCloudRuntimeConfigOptions,
   buildCloudDefaultConfigOptions,
   extractLatestConfigOptionsFromEntries,
+  getCloudReasoningConfigOptionId,
 } from "./cloudSessionConfig";
 
 function configUpdateEntry(
@@ -19,6 +20,13 @@ function configUpdateEntry(
   } as unknown as StoredLogEntry;
 }
 
+it.each([
+  ["claude", "effort"],
+  ["codex", "reasoning_effort"],
+] as const)("uses the %s reasoning config id", (adapter, expected) => {
+  expect(getCloudReasoningConfigOptionId(adapter)).toBe(expected);
+});
+
 describe("extractLatestConfigOptionsFromEntries", () => {
   it("returns undefined when no config_option_update entries exist", () => {
     expect(extractLatestConfigOptionsFromEntries([])).toBeUndefined();

packages/core/src/sessions/cloudSessionConfig.ts

@@ -5,6 +5,10 @@ import {
   getDefaultExecutionModeForAdapter,
 } from "./executionModes";
 
+export function getCloudReasoningConfigOptionId(adapter: Adapter): string {
+  return adapter === "codex" ? "reasoning_effort" : "effort";
+}
+
 /**
  * Pure derivations of cloud session config options. No store or host access —
  * just shaping the config-option list the mode switcher renders.
@@ -101,7 +105,7 @@ export function addMissingCloudRuntimeConfigOptions(
 
   if (initialReasoningEffort && !categories.has("thought_level")) {
     extras.push({
-      id: adapter === "codex" ? "reasoning_effort" : "effort",
+      id: getCloudReasoningConfigOptionId(adapter),
       name: adapter === "codex" ? "Reasoning" : "Effort",
       type: "select",
       currentValue: initialReasoningEffort,