diff --git a/bots/cormini/persona/blobs.ts b/bots/cormini/persona/blobs.ts
index c5648626..86a9faaa 100644
--- a/bots/cormini/persona/blobs.ts
+++ b/bots/cormini/persona/blobs.ts
@@ -1,4 +1,5 @@
 /** save_blob 工具的参数、权限检查与回执；附件存储由 WorkspaceBlobStore 提供。 */
+import { LOG_SCHEME, blobScheme } from 'cortico/core/blobs.ts';
 import type { BlobStore, CoreApi, ToolDef } from 'cortico/core/types.ts';
 
 export const SAVE_BLOB_DECL: Omit<ToolDef, 'handler'> = {
@@ -11,7 +12,7 @@ export const SAVE_BLOB_DECL: Omit<ToolDef, 'handler'> = {
   parameters: {
     type: 'object',
     properties: {
-      handle: { type: 'string', description: 'The log: handle (a unique prefix of 8+ hex digits is enough).' },
+      handle: { type: 'string', description: 'The log: handle as written in the [blob ...] line, e.g. log:1a2b3c4d (a unique prefix of 8+ hex digits after log: is enough).' },
       path: { type: 'string', description: 'Where to keep it, relative to your workspace, with an extension.' },
     },
     required: ['handle', 'path'],
@@ -28,9 +29,11 @@ export function saveBlobTool(deps: {
   return {
     ...SAVE_BLOB_DECL,
     handler: async (args, ctx) => {
-      const handle = String(args.handle ?? '').trim();
+      const given = String(args.handle ?? '').trim();
       const path = String(args.path ?? '').trim();
-      if (!handle) return '[save failed] handle 不能为空';
+      if (!given) return '[save failed] handle 不能为空';
+      // 只给了哈希时按 log: 句柄解析
+      const handle = blobScheme(given) ? given : `${LOG_SCHEME}${given}`;
       if (!path) return '[save failed] path 不能为空';
       const denied = deps.guard?.(path, ctx.role) ?? null;
       if (denied) return `[save failed] ${denied}`;
diff --git a/src/core/usage-log.ts b/src/core/usage-log.ts
index 4ad1da16..96446c18 100644
--- a/src/core/usage-log.ts
+++ b/src/core/usage-log.ts
@@ -1,8 +1,32 @@
 /** Append-only usage ledger. Failed writes remain queued and are reported to the operator. */
-import { appendFileSync, existsSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs';
+import { appendFileSync, closeSync, existsSync, mkdirSync, openSync, readSync, writeFileSync } from 'node:fs';
 import { dirname } from 'node:path';
 import type { UsageRecord } from './types.ts';
 
+/** The ledger is read in chunks so its size is not bounded by V8's maximum string length. */
+const READ_CHUNK_BYTES = 4 * 1024 * 1024;
+
+/** Lines split at the newline byte, which never occurs inside a UTF-8 multibyte sequence. */
+function* fileLines(file: string): Generator<string> {
+  const fd = openSync(file, 'r');
+  try {
+    const chunk = Buffer.alloc(READ_CHUNK_BYTES);
+    let rest = Buffer.alloc(0);
+    for (let n = readSync(fd, chunk); n > 0; n = readSync(fd, chunk)) {
+      const buf = rest.length ? Buffer.concat([rest, chunk.subarray(0, n)]) : chunk.subarray(0, n);
+      let start = 0;
+      for (let end = buf.indexOf(10); end !== -1; end = buf.indexOf(10, start)) {
+        yield buf.toString('utf8', start, end);
+        start = end + 1;
+      }
+      rest = Buffer.from(buf.subarray(start));
+    }
+    if (rest.length) yield rest.toString('utf8');
+  } finally {
+    closeSync(fd);
+  }
+}
+
 export class UsageLog {
   private pending: UsageRecord[] = [];
   private error: string | null = null;
@@ -45,7 +69,7 @@ export class UsageLog {
     const out: UsageRecord[] = [];
     const seen = new Set<string>();
     let damaged = 0;
-    for (const line of readFileSync(this.file, 'utf8').split(/\r?\n/)) {
+    for (const line of fileLines(this.file)) {
       if (!line.trim()) continue;
       let record: UsageRecord;
       try { record = JSON.parse(line) as UsageRecord; } catch { damaged++; continue; }
diff --git a/src/web/client/features/extensions/index.ts b/src/web/client/features/extensions/index.ts
index 5b8e0b86..78c24c7b 100644
--- a/src/web/client/features/extensions/index.ts
+++ b/src/web/client/features/extensions/index.ts
@@ -1283,7 +1283,8 @@ export function mountExtensions(ctx: FeatureContext): void {
       }
       if (signal.aborted) return;
       const restartHint = action === 'delete' || resultKind !== 'bot' ? ' ' + S.restartNeeded : '';
-      message(owner, area, `${S.completed(actionLabel, name)}${version ? ' ' + S.version(version) : ''}${restartHint}`);
+      const activateHint = actionLabel === S.installedAction && resultKind === 'world' ? ' ' + S.worldActivateHint : '';
+      message(owner, area, `${S.completed(actionLabel, name)}${version ? ' ' + S.version(version) : ''}${restartHint}${activateHint}`);
       updates.delete(name);
       if (!await load()) message(owner, area, S.completed(actionLabel, name) + ' ' + S.syncedFailed, true);
     } catch (error) { if (!signal.aborted) message(owner, area, errorText(error), true); }
diff --git a/src/web/client/features/extensions/strings.de.ts b/src/web/client/features/extensions/strings.de.ts
index 6bdb60d7..bf36aee2 100644
--- a/src/web/client/features/extensions/strings.de.ts
+++ b/src/web/client/features/extensions/strings.de.ts
@@ -60,6 +60,7 @@ export const S: Partial<typeof en> = {
   progress: (action: string, name: string) => `${action} von ${name} läuft…`,
   completed: (action: string, name: string) => `${action} von ${name} abgeschlossen.`,
   restartNeeded: 'Gilt nach dem Neustart des Prozesses.',
+  worldActivateHint: 'Ist die World nicht aktiv, aktiviere sie in der World-Übersicht.',
   syncedFailed: 'Vorgang abgeschlossen, aber die Liste ist nicht synchron. Aktualisiere, um es erneut zu versuchen.',
 
   filterPlaceholder: 'Filter: Name, Beschreibung, Stichwörter',
diff --git a/src/web/client/features/extensions/strings.es-419.ts b/src/web/client/features/extensions/strings.es-419.ts
index 33da4e23..df7f7fe2 100644
--- a/src/web/client/features/extensions/strings.es-419.ts
+++ b/src/web/client/features/extensions/strings.es-419.ts
@@ -60,6 +60,7 @@ export const S: Partial<typeof en> = {
   progress: (action: string, name: string) => `${action} en curso: ${name}…`,
   completed: (action: string, name: string) => `${action} completada: ${name}.`,
   restartNeeded: 'Surte efecto después de reiniciar el proceso.',
+  worldActivateHint: 'Si el World no está activo, actívalo en Resumen de Worlds.',
   syncedFailed: 'La operación se completó, pero la lista no está sincronizada. Actualiza para reintentar.',
 
   filterPlaceholder: 'Filtrar: nombre, descripción, palabras clave',
diff --git a/src/web/client/features/extensions/strings.fr.ts b/src/web/client/features/extensions/strings.fr.ts
index 10323fdd..7521fd29 100644
--- a/src/web/client/features/extensions/strings.fr.ts
+++ b/src/web/client/features/extensions/strings.fr.ts
@@ -60,6 +60,7 @@ export const S: Partial<typeof en> = {
   progress: (action: string, name: string) => `${action} de ${name} en cours…`,
   completed: (action: string, name: string) => `${action} de ${name} réussie.`,
   restartNeeded: 'Prend effet après le redémarrage du processus.',
+  worldActivateHint: "Si le World n'est pas actif, activez-le dans Vue d'ensemble des World.",
   syncedFailed: "Opération terminée, mais la liste n'est pas synchronisée. Actualisez pour réessayer.",
 
   filterPlaceholder: 'Filtrer : nom, description, mots-clés',
diff --git a/src/web/client/features/extensions/strings.it.ts b/src/web/client/features/extensions/strings.it.ts
index 51d1fbae..184328c5 100644
--- a/src/web/client/features/extensions/strings.it.ts
+++ b/src/web/client/features/extensions/strings.it.ts
@@ -60,6 +60,7 @@ export const S: Partial<typeof en> = {
   progress: (action: string, name: string) => `${action} di ${name} in corso…`,
   completed: (action: string, name: string) => `Operazione completata: ${action.toLowerCase()} di ${name}.`,
   restartNeeded: 'Ha effetto dopo il riavvio del processo.',
+  worldActivateHint: 'Se il World non è attivo, attivalo in Panoramica dei World.',
   syncedFailed: "Operazione completata, ma l'elenco non è sincronizzato. Aggiorna per riprovare.",
 
   filterPlaceholder: 'Filtra: nome, descrizione, parole chiave',
diff --git a/src/web/client/features/extensions/strings.ja.ts b/src/web/client/features/extensions/strings.ja.ts
index 96a2ace8..986135dd 100644
--- a/src/web/client/features/extensions/strings.ja.ts
+++ b/src/web/client/features/extensions/strings.ja.ts
@@ -60,6 +60,7 @@ export const S: Partial<typeof en> = {
   progress: (action: string, name: string) => `${action}中：${name}…`,
   completed: (action: string, name: string) => `${action}が完了しました：${name}。`,
   restartNeeded: 'プロセスの再起動後に反映されます。',
+  worldActivateHint: '有効になっていない World は World 一覧で有効化してください。',
   syncedFailed: '操作は完了しましたが、一覧が同期されていません。更新してください。',
 
   filterPlaceholder: '絞り込み：パッケージ名、説明、キーワード',
diff --git a/src/web/client/features/extensions/strings.ko.ts b/src/web/client/features/extensions/strings.ko.ts
index b9984065..4c533925 100644
--- a/src/web/client/features/extensions/strings.ko.ts
+++ b/src/web/client/features/extensions/strings.ko.ts
@@ -60,6 +60,7 @@ export const S: Partial<typeof en> = {
   progress: (action: string, name: string) => `${action} 중: ${name}…`,
   completed: (action: string, name: string) => `${action} 완료: ${name}.`,
   restartNeeded: '프로세스를 재시작한 뒤 적용됩니다.',
+  worldActivateHint: '활성화되지 않은 World는 World 개요에서 활성화하세요.',
   syncedFailed: '작업은 끝났지만 목록이 동기화되지 않았습니다. 새로 고치세요.',
 
   filterPlaceholder: '필터: 패키지 이름, 설명, 키워드',
diff --git a/src/web/client/features/extensions/strings.pt-BR.ts b/src/web/client/features/extensions/strings.pt-BR.ts
index 8d61909e..47ae11d6 100644
--- a/src/web/client/features/extensions/strings.pt-BR.ts
+++ b/src/web/client/features/extensions/strings.pt-BR.ts
@@ -60,6 +60,7 @@ export const S: Partial<typeof en> = {
   progress: (action: string, name: string) => `${action} em andamento: ${name}…`,
   completed: (action: string, name: string) => `${action} concluída: ${name}.`,
   restartNeeded: 'Tem efeito após reiniciar o processo.',
+  worldActivateHint: 'Se o World não estiver ativo, ative-o em Visão geral dos Worlds.',
   syncedFailed: 'Operação concluída, mas a lista está dessincronizada. Atualize para tentar de novo.',
 
   filterPlaceholder: 'Filtrar: nome, descrição, palavras-chave',
diff --git a/src/web/client/features/extensions/strings.ru.ts b/src/web/client/features/extensions/strings.ru.ts
index ae93feb5..b034d046 100644
--- a/src/web/client/features/extensions/strings.ru.ts
+++ b/src/web/client/features/extensions/strings.ru.ts
@@ -66,6 +66,7 @@ export const S: Partial<typeof en> = {
   progress: (action: string, name: string) => `${action} ${name}…`,
   completed: (action: string, name: string) => `${action} ${name}: готово.`,
   restartNeeded: 'Вступит в силу после перезапуска процесса.',
+  worldActivateHint: 'Если World не активен, активируйте его на странице «Обзор World».',
   syncedFailed: 'Операция выполнена, но список не синхронизирован. Обновите, чтобы повторить.',
 
   filterPlaceholder: 'Фильтр: имя, описание, ключевые слова',
diff --git a/src/web/client/features/extensions/strings.ts b/src/web/client/features/extensions/strings.ts
index 8f51c36e..45241062 100644
--- a/src/web/client/features/extensions/strings.ts
+++ b/src/web/client/features/extensions/strings.ts
@@ -70,6 +70,7 @@ const zh = {
   progress: (action: string, name: string) => `正在${action}：${name}…`,
   completed: (action: string, name: string) => `${action}成功：${name}。`,
   restartNeeded: '重启进程后生效。',
+  worldActivateHint: '未激活的 World 要到 World 总览里激活。',
   syncedFailed: '操作已完成，但列表未同步；请刷新。',
 
   filterPlaceholder: '筛选：包名、描述、关键字',
@@ -308,6 +309,7 @@ export const en: typeof zh = {
   progress: (action: string, name: string) => `${action}: ${name}…`,
   completed: (action: string, name: string) => `${action} completed: ${name}.`,
   restartNeeded: 'Takes effect after the process restarts.',
+  worldActivateHint: 'If the World is not active, activate it in World overview.',
   syncedFailed: 'Operation completed, but the list is out of sync. Refresh to retry.',
 
   filterPlaceholder: 'Filter: name, description, keywords',
diff --git a/src/web/client/features/extensions/strings.zh-Hant.ts b/src/web/client/features/extensions/strings.zh-Hant.ts
index 3e9006bc..40ee052b 100644
--- a/src/web/client/features/extensions/strings.zh-Hant.ts
+++ b/src/web/client/features/extensions/strings.zh-Hant.ts
@@ -60,6 +60,7 @@ export const S: Partial<typeof en> = {
   progress: (action: string, name: string) => `正在${action}：${name}…`,
   completed: (action: string, name: string) => `${action}成功：${name}。`,
   restartNeeded: '重新啟動處理程序後生效。',
+  worldActivateHint: '未啟用的 World 請到 World 總覽啟用。',
   syncedFailed: '操作已完成，但清單未同步；請重新整理。',
 
   filterPlaceholder: '篩選：套件名稱、描述、關鍵字',
diff --git a/tests/core/usage-log.test.ts b/tests/core/usage-log.test.ts
index cfebf569..80b62a2c 100644
--- a/tests/core/usage-log.test.ts
+++ b/tests/core/usage-log.test.ts
@@ -44,6 +44,18 @@ describe('UsageLog', () => {
     expect(readFileSync(file, 'utf8')).toBe(raw);
   });
 
+  it('账本跨多个读取块时每行完整读出,多字节字符落在块边界上也不损坏', () => {
+    const label = '主意识'.repeat(700);
+    const lines = Array.from({ length: 1400 }, (_, i) => JSON.stringify({ ...rec(1), version: 2, recordId: `r${i}`, label }));
+    writeFileSync(file, lines.join('\r\n') + '\n');
+    expect(readFileSync(file).byteLength).toBeGreaterThan(8 * 1024 * 1024);
+    const errors: string[] = [];
+    const all = new UsageLog(file, error => errors.push(error)).readAll();
+    expect(all.map(r => r.recordId)).toEqual(lines.map((_, i) => `r${i}`));
+    expect(all.every(r => r.label === label)).toBe(true);
+    expect(errors).toEqual([]);
+  });
+
   it('坏行跳过,不影响其它行', () => {
     const log = new UsageLog(file);
     log.append(rec(1));
diff --git a/tests/cormini/blobs.test.ts b/tests/cormini/blobs.test.ts
index ffef1ad4..9d4c6eaa 100644
--- a/tests/cormini/blobs.test.ts
+++ b/tests/cormini/blobs.test.ts
@@ -64,6 +64,7 @@ describe('save_blob 与 read_file 的二进制回执', () => {
     const out = await tool.handler({ handle: 'log:abcdef01', path: 'blobs/stickers/cat.png' }, ctx);
     expect(out).toBe(`[saved] mem:blobs/stickers/cat.png image/png ${PNG.length} 字节`);
     expect(readFileSync(join(dir, 'blobs', 'stickers', 'cat.png')).equals(PNG)).toBe(true);
+    expect(await tool.handler({ handle: 'abcdef01', path: 'blobs/bare.png' }, ctx)).toBe(`[saved] mem:blobs/bare.png image/png ${PNG.length} 字节`);
     expect(await tool.handler({ handle: 'log:nope', path: 'blobs/x.png' }, ctx)).toContain('[save failed] 没有 log:nope');
     expect(await tool.handler({ handle: 'log:abcdef01', path: '../x.png' }, ctx)).toContain('[save failed]');
   });