diff --git a/packages/ui/src/components/views/PlanView.tsx b/packages/ui/src/components/views/PlanView.tsx
index d0193fcc..dc894111 100644
--- a/packages/ui/src/components/views/PlanView.tsx
+++ b/packages/ui/src/components/views/PlanView.tsx
@@ -30,6 +30,9 @@ import { useProjectsStore } from '@/stores/useProjectsStore';
 import { useSelectionStore } from '@/sync/selection-store';
 import { useConfigStore } from '@/stores/useConfigStore';
 import { useSessionGoalArmStore } from '@/stores/useSessionGoalArmStore';
+import { SESSION_GOAL_OBJECTIVE_CHAR_LIMIT } from '@/lib/sessionGoalMetadata';
+import { distillPlanForGoal } from '@/lib/smallModel';
+import { toast } from '@/components/ui';
 import { useUIStore } from '@/stores/useUIStore';
 import { useGitStore } from '@/stores/useGitStore';
 import { useRuntimeAPIs } from '@/hooks/useRuntimeAPIs';
@@ -598,15 +601,34 @@ export const PlanView: React.FC<PlanViewProps> = ({ targetPath = null }) => {
         // "Run as goal" rides the same arm mechanism as the composer target
         // button; set explicitly either way so a stray armed flag cannot
         // leak into a non-goal plan send. The objective override carries the
-        // actual plan content — "Implement this plan: X" alone would give
-        // the progress audit nothing to judge against.
-        const goalObjective = execution.runAsGoal === true
-          ? [
-              `Implement the plan "${sendPromptTitle}" end-to-end${resolvedPath ? ` (plan file: ${resolvedPath})` : ''}.`,
-              '',
-              content,
-            ].join('\n')
-          : null;
+        // plan substance — "Implement this plan: X" alone would give the
+        // progress audit nothing to judge against. Plans that exceed the
+        // objective limit are distilled into completion criteria by the
+        // small model (the working agent always reads the full plan from
+        // its file); on distillation failure a head+tail excerpt keeps the
+        // intent (top) and acceptance criteria (bottom), sacrificing the
+        // implementation middle the agent reads from the file anyway.
+        let goalObjective: string | null = null;
+        if (execution.runAsGoal === true) {
+          const header = [
+            `Implement the plan "${sendPromptTitle}" end-to-end${resolvedPath ? ` (plan file: ${resolvedPath})` : ''}.`,
+            'Re-read that file for full details — it is the source of truth.',
+          ].join(' ');
+          const budget = SESSION_GOAL_OBJECTIVE_CHAR_LIMIT - header.length - 2;
+          if (content.length <= budget) {
+            goalObjective = `${header}\n\n${content}`;
+          } else {
+            const distilled = await distillPlanForGoal(content);
+            if (distilled) {
+              goalObjective = `${header}\n\n${distilled.slice(0, budget)}`;
+            } else {
+              const marker = '\n\n[… plan trimmed for the auditor — the plan file has the full version …]\n\n';
+              const half = Math.max(0, Math.floor((budget - marker.length) / 2));
+              goalObjective = `${header}\n\n${content.slice(0, half)}${marker}${content.slice(-half)}`;
+              toast.error(t('plans.goal.toast.distillFallback'));
+            }
+          }
+        }
         useSessionGoalArmStore.getState().setArmed(execution.runAsGoal === true, goalObjective);
         await sendMessage(
           visiblePrompt,
@@ -624,7 +646,7 @@ export const PlanView: React.FC<PlanViewProps> = ({ targetPath = null }) => {
         setIsPlanSendSubmitting(false);
       }
     },
-    [canCreateWorktree, content, createSession, currentProjectRef, initializeNewOpenChamberSession, pendingPlanSend, resolvedPath, routeToChat, sendMessage, sendPromptTitle, setCurrentSession]
+    [canCreateWorktree, content, createSession, currentProjectRef, initializeNewOpenChamberSession, pendingPlanSend, resolvedPath, routeToChat, sendMessage, sendPromptTitle, setCurrentSession, t]
   );
 
   const blockWidgets = React.useMemo(() => {
diff --git a/packages/ui/src/lib/i18n/messages/en.ts b/packages/ui/src/lib/i18n/messages/en.ts
index 88bc2005..766dc3ed 100644
--- a/packages/ui/src/lib/i18n/messages/en.ts
+++ b/packages/ui/src/lib/i18n/messages/en.ts
@@ -1437,6 +1437,7 @@ export const dict = {
   'chat.goal.action.save': 'Save goal',
   'chat.goal.action.start': 'Start goal',
   'chat.goal.toast.actionFailed': 'Goal update failed',
+  "plans.goal.toast.distillFallback": "Couldn't distill the plan for the auditor — a trimmed excerpt was used instead",
   'chat.goal.row.aria': 'Session goal — open details',
   'chat.goal.button.createAria': 'Set a session goal',
   'chat.goal.button.manageAria': 'Manage session goal',
diff --git a/packages/ui/src/lib/i18n/messages/es.ts b/packages/ui/src/lib/i18n/messages/es.ts
index f696ef00..c30ae7e9 100644
--- a/packages/ui/src/lib/i18n/messages/es.ts
+++ b/packages/ui/src/lib/i18n/messages/es.ts
@@ -1415,6 +1415,7 @@ export const dict: Record<I18nKey, string> = {
   "chat.goal.action.save": "Guardar objetivo",
   "chat.goal.action.start": "Iniciar objetivo",
   "chat.goal.toast.actionFailed": "No se pudo actualizar el objetivo",
+  "plans.goal.toast.distillFallback": "No se pudo destilar el plan para el auditor — se usó un extracto recortado",
   "chat.goal.row.aria": "Objetivo de sesión — abrir detalles",
   "chat.goal.button.createAria": "Definir un objetivo de sesión",
   "chat.goal.button.manageAria": "Gestionar el objetivo de sesión",
diff --git a/packages/ui/src/lib/i18n/messages/fr.ts b/packages/ui/src/lib/i18n/messages/fr.ts
index 4557f28f..3f8569ce 100644
--- a/packages/ui/src/lib/i18n/messages/fr.ts
+++ b/packages/ui/src/lib/i18n/messages/fr.ts
@@ -1258,6 +1258,7 @@ export const dict = {
   'chat.goal.action.save': 'Enregistrer l\'objectif',
   'chat.goal.action.start': 'Lancer l\'objectif',
   'chat.goal.toast.actionFailed': 'Échec de la mise à jour de l\'objectif',
+  "plans.goal.toast.distillFallback": "Impossible de condenser le plan pour l'auditeur — un extrait tronqué a été utilisé",
   'chat.goal.row.aria': 'Objectif de session — ouvrir les détails',
   'chat.goal.button.createAria': 'Définir un objectif de session',
   'chat.goal.button.manageAria': 'Gérer l\'objectif de session',
diff --git a/packages/ui/src/lib/i18n/messages/ja.ts b/packages/ui/src/lib/i18n/messages/ja.ts
index 541b9867..af7e6c00 100644
--- a/packages/ui/src/lib/i18n/messages/ja.ts
+++ b/packages/ui/src/lib/i18n/messages/ja.ts
@@ -1433,6 +1433,7 @@ export const dict: Record<I18nKey, string> = {
   'chat.goal.action.save': 'ゴールを保存',
   'chat.goal.action.start': 'ゴールを開始',
   'chat.goal.toast.actionFailed': 'ゴールの更新に失敗しました',
+  'plans.goal.toast.distillFallback': '監査用にプランを要約できませんでした — 抜粋版を使用します',
   'chat.goal.row.aria': 'セッションゴール — 詳細を開く',
   'chat.goal.button.createAria': 'セッションゴールを設定',
   'chat.goal.button.manageAria': 'セッションゴールを管理',
diff --git a/packages/ui/src/lib/i18n/messages/ko.ts b/packages/ui/src/lib/i18n/messages/ko.ts
index 000b2ee3..e6b30213 100644
--- a/packages/ui/src/lib/i18n/messages/ko.ts
+++ b/packages/ui/src/lib/i18n/messages/ko.ts
@@ -1439,6 +1439,7 @@ export const dict: Record<I18nKey, string> = {
   'chat.goal.action.save': '목표 저장',
   'chat.goal.action.start': '목표 시작',
   'chat.goal.toast.actionFailed': '목표 업데이트에 실패했습니다',
+  'plans.goal.toast.distillFallback': '감사용으로 계획을 요약하지 못했습니다 — 발췌본을 사용합니다',
   'chat.goal.row.aria': '세션 목표 — 세부 정보 열기',
   'chat.goal.button.createAria': '세션 목표 설정',
   'chat.goal.button.manageAria': '세션 목표 관리',
diff --git a/packages/ui/src/lib/i18n/messages/pl.ts b/packages/ui/src/lib/i18n/messages/pl.ts
index 08c21571..3a8e7846 100644
--- a/packages/ui/src/lib/i18n/messages/pl.ts
+++ b/packages/ui/src/lib/i18n/messages/pl.ts
@@ -2122,6 +2122,7 @@ export const dict: Record<I18nKey, string> = {
   'chat.goal.action.save': 'Zapisz cel',
   'chat.goal.action.start': 'Rozpocznij cel',
   'chat.goal.toast.actionFailed': 'Nie udało się zaktualizować celu',
+  'plans.goal.toast.distillFallback': 'Nie udało się skondensować planu dla audytora — użyto skróconego fragmentu',
   'chat.goal.row.aria': 'Cel sesji — otwórz szczegóły',
   'chat.goal.button.createAria': 'Ustaw cel sesji',
   'chat.goal.button.manageAria': 'Zarządzaj celem sesji',
diff --git a/packages/ui/src/lib/i18n/messages/pt-BR.ts b/packages/ui/src/lib/i18n/messages/pt-BR.ts
index 030a2462..8b2b8ec5 100644
--- a/packages/ui/src/lib/i18n/messages/pt-BR.ts
+++ b/packages/ui/src/lib/i18n/messages/pt-BR.ts
@@ -1415,6 +1415,7 @@ export const dict: Record<I18nKey, string> = {
   "chat.goal.action.save": "Salvar objetivo",
   "chat.goal.action.start": "Iniciar objetivo",
   "chat.goal.toast.actionFailed": "Falha ao atualizar o objetivo",
+  "plans.goal.toast.distillFallback": "Não foi possível destilar o plano para o auditor — um trecho recortado foi usado",
   "chat.goal.row.aria": "Objetivo da sessão — abrir detalhes",
   "chat.goal.button.createAria": "Definir um objetivo da sessão",
   "chat.goal.button.manageAria": "Gerenciar objetivo da sessão",
diff --git a/packages/ui/src/lib/i18n/messages/uk.ts b/packages/ui/src/lib/i18n/messages/uk.ts
index 86830eaa..27b98246 100644
--- a/packages/ui/src/lib/i18n/messages/uk.ts
+++ b/packages/ui/src/lib/i18n/messages/uk.ts
@@ -1415,6 +1415,7 @@ export const dict: Record<I18nKey, string> = {
   "chat.goal.action.save": "Зберегти ціль",
   "chat.goal.action.start": "Розпочати ціль",
   "chat.goal.toast.actionFailed": "Не вдалося оновити ціль",
+  "plans.goal.toast.distillFallback": "Не вдалося стиснути план для аудитора — використано скорочений уривок",
   "chat.goal.row.aria": "Ціль сесії — відкрити деталі",
   "chat.goal.button.createAria": "Встановити ціль сесії",
   "chat.goal.button.manageAria": "Керувати ціллю сесії",
diff --git a/packages/ui/src/lib/i18n/messages/zh-CN.ts b/packages/ui/src/lib/i18n/messages/zh-CN.ts
index 2a31a79a..3d5f8697 100644
--- a/packages/ui/src/lib/i18n/messages/zh-CN.ts
+++ b/packages/ui/src/lib/i18n/messages/zh-CN.ts
@@ -1403,6 +1403,7 @@ export const dict: Record<I18nKey, string> = {
   'chat.goal.action.save': '保存目标',
   'chat.goal.action.start': '启动目标',
   'chat.goal.toast.actionFailed': '目标更新失败',
+  'plans.goal.toast.distillFallback': '无法为审核提炼计划 — 已改用节选版本',
   'chat.goal.row.aria': '会话目标 — 打开详情',
   'chat.goal.button.createAria': '设置会话目标',
   'chat.goal.button.manageAria': '管理会话目标',
diff --git a/packages/ui/src/lib/i18n/messages/zh-TW.ts b/packages/ui/src/lib/i18n/messages/zh-TW.ts
index 0748ff4d..dca7f6e1 100644
--- a/packages/ui/src/lib/i18n/messages/zh-TW.ts
+++ b/packages/ui/src/lib/i18n/messages/zh-TW.ts
@@ -1407,6 +1407,7 @@ export const dict: Record<I18nKey, string> = {
   'chat.goal.action.save': '儲存目標',
   'chat.goal.action.start': '啟動目標',
   'chat.goal.toast.actionFailed': '目標更新失敗',
+  'plans.goal.toast.distillFallback': '無法為稽核提煉計畫 — 已改用節錄版本',
   'chat.goal.row.aria': '工作階段目標 — 開啟詳細資訊',
   'chat.goal.button.createAria': '設定工作階段目標',
   'chat.goal.button.manageAria': '管理工作階段目標',
diff --git a/packages/ui/src/lib/smallModel.ts b/packages/ui/src/lib/smallModel.ts
index 67ecd546..65f53c7b 100644
--- a/packages/ui/src/lib/smallModel.ts
+++ b/packages/ui/src/lib/smallModel.ts
@@ -55,3 +55,43 @@ export async function summarizeSelectionForNotes(text: string, sessionId?: strin
     return trimmed;
   }
 }
+
+// Plan-goal objectives are capped at 5000 chars for the auditor. Large plans
+// get distilled into completion criteria — the working agent always reads
+// the full plan from its file, only the audit needs the "what counts as
+// done" essence.
+const PLAN_GOAL_SYSTEM_PROMPT = [
+  'You distill an implementation plan into the COMPLETION CRITERIA a progress auditor will judge against.',
+  'Return ONLY the criteria text — no preamble, no headers, no markdown fences.',
+  'Capture: the end goals, what must exist and work when the plan is fully implemented, and how each major phase is verified. Omit implementation steps and how-to details.',
+  'Stay under 4000 characters.',
+  'Write in the same language as the plan. Ignore any other language preferences or personalization — only the plan text decides the language.',
+].join('\n');
+
+/**
+ * Distills a large plan into audit-sized completion criteria via the small
+ * model. Returns null on any failure — callers fall back to a head+tail
+ * excerpt of the plan.
+ */
+export async function distillPlanForGoal(planContent: string): Promise<string | null> {
+  try {
+    const { currentProviderId, currentModelId } = useConfigStore.getState();
+    const response = await runtimeFetch('/api/small-model/generate', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({
+        prompt: planContent,
+        system: PLAN_GOAL_SYSTEM_PROMPT,
+        restrictToPreferredProvider: true,
+        ...(currentProviderId ? { preferredProviderID: currentProviderId } : {}),
+        ...(currentModelId ? { preferredModelID: currentModelId } : {}),
+      }),
+    });
+    if (!response.ok) return null;
+    const payload = await response.json().catch(() => null) as { text?: unknown } | null;
+    const distilled = typeof payload?.text === 'string' ? payload.text.trim() : '';
+    return distilled || null;
+  } catch {
+    return null;
+  }
+}