fix(mobile,extension): use the real cloud agent prompt cap

apps/extension/entrypoints/sidepanel/agents-new-session.test.ts

@@ -1,3 +1,4 @@
+import { CLOUD_AGENT_PROMPT_MAX_LENGTH } from '@kilocode/cloud-agent-sdk/limits';
 import { describe, expect, it, vi } from 'vitest';
 
 import {
@@ -73,8 +74,8 @@ describe('constants', () => {
     expect(PROMPT_MIN_LENGTH).toBe(3);
   });
 
-  it('promptMaxLength is 4000', () => {
-    expect(PROMPT_MAX_LENGTH).toBe(4000);
+  it('promptMaxLength is the shared cloud agent prompt cap', () => {
+    expect(PROMPT_MAX_LENGTH).toBe(CLOUD_AGENT_PROMPT_MAX_LENGTH);
   });
 
   it('mode is "code"', () => {

apps/extension/entrypoints/sidepanel/agents-new-session.tsx

@@ -32,6 +32,7 @@ import { fetchModelPreferences } from '@/src/shared/model-preferences-client';
 import { isGatewayModelId } from '@/src/shared/model-picker-rows';
 import { getModelPreferencesQueryKey } from '@/src/shared/side-panel-query-options';
 import { thinkingEffortLabel } from '@/src/shared/kilo-api-client';
+import { CLOUD_AGENT_PROMPT_MAX_LENGTH } from '@kilocode/cloud-agent-sdk/limits';
 import type { KiloGatewayModelOption } from '@/src/shared/kilo-api-client';
 import { useExtensionAgents } from './agents-provider';
 import { activeSessionsQueryKey, sessionHistoryQueryKey } from './agents-session-list';
@@ -43,7 +44,7 @@ import { useGatewayModels } from './use-gateway-models';
 // ---------------------------------------------------------------------------
 
 const PROMPT_MIN_LENGTH = 3;
-const PROMPT_MAX_LENGTH = 4000;
+const PROMPT_MAX_LENGTH = CLOUD_AGENT_PROMPT_MAX_LENGTH;
 const MODE = 'code' as const;
 
 /**

apps/mobile/src/components/agents/chat-composer-input-row.tsx

@@ -1,4 +1,5 @@
 import { ArrowUp, Paperclip, Square } from '@/components/ui/icons';
+import { CLOUD_AGENT_PROMPT_MAX_LENGTH } from '@kilocode/cloud-agent-sdk/limits';
 import { type RefObject } from 'react';
 import { useTranslation } from 'react-i18next';
 import {
@@ -119,7 +120,7 @@ export function ChatComposerInputRow({
           placeholder={placeholder}
           placeholderTextColor={colors.mutedForeground}
           multiline
-          maxLength={4000}
+          maxLength={CLOUD_AGENT_PROMPT_MAX_LENGTH}
           onChangeText={onChangeText}
           onFocus={onInputFocus}
           onBlur={onInputBlur}

apps/mobile/src/components/agents/chat-composer.tsx

@@ -6,6 +6,7 @@
 import * as Haptics from 'expo-haptics';
 import { useActionSheet } from '@expo/react-native-action-sheet';
 import { type SlashCommandInfo } from '@kilocode/cloud-agent-sdk';
+import { CLOUD_AGENT_PROMPT_MAX_LENGTH } from '@kilocode/cloud-agent-sdk/limits';
 import { type RemoteCommandState } from '@kilocode/cloud-agent-sdk/remote-command-catalog';
 import {
   type Ref,
@@ -474,7 +475,7 @@ export function ChatComposer({
   useSharePrefill({
     shareId,
     inputRef,
-    maxLength: 4000,
+    maxLength: CLOUD_AGENT_PROMPT_MAX_LENGTH,
     onChangeText: handleChangeText,
     addCandidates,
     onDelivered: () => {
@@ -500,7 +501,7 @@ export function ChatComposer({
       applyVoiceDraftToInput({
         input: inputRef.current,
         draft,
-        maxLength: 4000,
+        maxLength: CLOUD_AGENT_PROMPT_MAX_LENGTH,
         onChangeText: handleChangeText,
       });
     },
@@ -537,7 +538,7 @@ export function ChatComposer({
         input: inputRef.current,
         draft: textRef.current,
         selection: selectionRef.current,
-        maxLength: 4000,
+        maxLength: CLOUD_AGENT_PROMPT_MAX_LENGTH,
         onChangeText: handleChangeText,
       });
     },

apps/mobile/src/components/agents/new-session-prompt.tsx

@@ -1,3 +1,4 @@
+import { CLOUD_AGENT_PROMPT_MAX_LENGTH } from '@kilocode/cloud-agent-sdk/limits';
 import { useCallback, useEffect, useRef, useState } from 'react';
 import {
   type LayoutChangeEvent,
@@ -45,7 +46,7 @@ const PROMPT_INPUT_LINE_HEIGHT = 24;
 const PROMPT_INPUT_VERTICAL_PADDING = 16;
 const PROMPT_INPUT_HORIZONTAL_PADDING = Platform.OS === 'android' ? 48 : 16;
 const PROMPT_INPUT_ANDROID_HORIZONTAL_INSET = 24;
-const PROMPT_INPUT_MAX_CHARS = 4000;
+const PROMPT_INPUT_MAX_CHARS = CLOUD_AGENT_PROMPT_MAX_LENGTH;
 const PROMPT_INPUT_MIN_HEIGHT =
   PROMPT_INPUT_LINE_HEIGHT * PROMPT_INPUT_DEFAULT_LINES + PROMPT_INPUT_VERTICAL_PADDING;
 const PROMPT_INPUT_MAX_HEIGHT =

apps/mobile/src/lib/share-payload.ts

@@ -1,3 +1,4 @@
+import { CLOUD_AGENT_PROMPT_MAX_LENGTH } from '@kilocode/cloud-agent-sdk/limits';
 import * as Crypto from 'expo-crypto';
 import { cacheDirectory, copyAsync, deleteAsync } from 'expo-file-system/legacy';
 import { type ShareIntent } from 'expo-share-intent';
@@ -13,8 +14,8 @@ export type SharePayload = {
   failedFiles: string[];
 };
 
-/** Mirrors PROMPT_INPUT_MAX_CHARS in new-session-prompt.tsx (module-local; composer clamps again). */
-export const SHARE_TEXT_MAX_CHARS = 4000;
+/** The cloud agent prompt cap; the composer clamps again on delivery. */
+export const SHARE_TEXT_MAX_CHARS = CLOUD_AGENT_PROMPT_MAX_LENGTH;
 
 export const SHARE_PAYLOAD_MAX_ENTRIES = 5;
 

apps/web/src/lib/cloud-agent/constants.ts

@@ -178,11 +178,7 @@ export function normalizeAttachmentExtension(extension: string | undefined | nul
 export type { CloudAgentAttachments } from '@kilocode/app-shared/cloud-agent';
 
 /**
- * Maximum prompt length (in characters) accepted by the cloud agent.
- *
- * Mirrors the server-side cap in `services/cloud-agent-next/src/schema.ts`
- * (`Limits.MAX_PROMPT_LENGTH`). Prompts exceeding this would be rejected by
- * the worker, so we enforce the same limit client-side to give users
- * immediate feedback.
+ * Maximum prompt length (in characters) accepted by the cloud agent. Defined
+ * once in the SDK so the web, mobile, and extension composers share it.
  */
-export const CLOUD_AGENT_PROMPT_MAX_LENGTH = 100_000;
+export { CLOUD_AGENT_PROMPT_MAX_LENGTH } from '@kilocode/cloud-agent-sdk/limits';

packages/cloud-agent-sdk/src/limits.ts

@@ -0,0 +1,8 @@
+/**
+ * Maximum prompt length (in characters) accepted by the cloud agent.
+ *
+ * Mirrors the server-side cap in `services/cloud-agent-next/src/schema.ts`
+ * (`Limits.MAX_PROMPT_LENGTH`). Every client enforces the same limit so a
+ * composer never silently drops text the worker would have accepted.
+ */
+export const CLOUD_AGENT_PROMPT_MAX_LENGTH = 100_000;