diff --git a/src/adapters/cli/claude-code.ts b/src/adapters/cli/claude-code.ts
index 188cb6401..a50ab92bd 100644
--- a/src/adapters/cli/claude-code.ts
+++ b/src/adapters/cli/claude-code.ts
@@ -1149,6 +1149,9 @@ export function createClaudeFamilyAdapter(variant: ClaudeFamilyVariant, rawBin:
     // `botmux session-ready` 给出启动 selector 边界。worker 收到后清掉旧
     // readyPattern 证据，并等待新 prompt 再投首条消息。
     injectsReadyHook: true,
+    // `/effort` 不在此处——它是全局 PASSTHROUGH_COMMANDS 的成员（所有 CLI 尽力透传，
+    // 且刻意不带冷启动语义）。这里只保留 `/goal`：它是「开启一段目标工作」的命令，需要
+    // 空 topic 冷启动能力（isInitialSessionPassthrough 只认 adapter 层的这个字段）。
     defaultPassthroughCommands: variant.id === 'claude-code' ? ['/goal'] : undefined,
     // Seed shares most of this adapter but has not been verified to expose the
     // same native session-rename command. Keep the capability exact to Claude.
diff --git a/src/core/passthrough-commands.ts b/src/core/passthrough-commands.ts
index e3c160ea9..df1a935c4 100644
--- a/src/core/passthrough-commands.ts
+++ b/src/core/passthrough-commands.ts
@@ -27,6 +27,16 @@ export const PASSTHROUGH_COMMANDS = new Set([
   '/code-review', '/security-review', '/review',
   // Codex：/btw 向当前会话追加一条旁注/引导消息
   '/btw',
+  // 推理强度调档。放全局（而非某个 adapter 的 defaultPassthroughCommands）是刻意的：
+  //   ① 这里的命令本就是「尽力透传」——/plugin /mcp /btw 也并非所有 CLI 都支持，
+  //      CLI 认得就生效、认不得顶多回一句 unknown-command（不崩溃 / 不损坏 / 不泄露）。
+  //      Claude Code(2.1.220+) / Seed / Relay 原生支持 /effort，Codex 亦有 reasoning
+  //      effort；未来别的 CLI 补上后零改动自动生效，无需再逐个 adapter 加。
+  //   ② 全局集合刻意不带「空 topic 冷启动」能力（那只认 adapter 层的
+  //      defaultPassthroughCommands，见 isInitialSessionPassthrough）——/effort 是
+  //      「调档」而非「开一段工作」的命令，空话题里单发 /effort 不应凭空拉起会话。
+  //      对照 /goal（开启目标工作）仍留在 adapter 层，保留其冷启动语义。
+  '/effort',
 ]);
 
 /**
diff --git a/test/command-handler.test.ts b/test/command-handler.test.ts
index c6a862bdf..3db33fb8f 100644
--- a/test/command-handler.test.ts
+++ b/test/command-handler.test.ts
@@ -454,7 +454,7 @@ vi.mock('../src/services/card-mode-store.js', () => ({
 
 // ─── Imports (after mocks) ──────────────────────────────────────────────────
 
-import { DAEMON_COMMANDS, SESSIONLESS_DAEMON_COMMANDS, PASSTHROUGH_COMMANDS, resolvePassthroughCommands, handleCommand, handleCardCommand, handleTermLinkCommand, parseSlashCommandInvocation, parseForceTopicInvocation } from '../src/core/command-handler.js';
+import { DAEMON_COMMANDS, SESSIONLESS_DAEMON_COMMANDS, PASSTHROUGH_COMMANDS, resolvePassthroughCommands, resolveAdapterDefaultPassthroughCommands, handleCommand, handleCardCommand, handleTermLinkCommand, parseSlashCommandInvocation, parseForceTopicInvocation } from '../src/core/command-handler.js';
 import { setCardMode } from '../src/services/card-mode-store.js';
 import { writeRoleFile, deleteRoleFile, writeTeamRoleFile, deleteTeamRoleFile, resolveRole, resolveRoleFile } from '../src/core/role-resolver.js';
 import { setBotCapability, clearBotCapability } from '../src/services/bot-profile-store.js';
@@ -955,7 +955,7 @@ describe('/vc preparation command', () => {
 
 describe('PASSTHROUGH_COMMANDS set', () => {
   it('should contain expected slash commands forwarded to CLI', () => {
-    for (const cmd of ['/compact', '/model', '/clear', '/plugin', '/usage', '/context', '/cost', '/mcp', '/diff', '/btw']) {
+    for (const cmd of ['/compact', '/model', '/clear', '/plugin', '/usage', '/context', '/cost', '/mcp', '/diff', '/btw', '/effort']) {
       expect(PASSTHROUGH_COMMANDS.has(cmd), `Expected PASSTHROUGH_COMMANDS to contain ${cmd}`).toBe(true);
     }
   });
@@ -979,6 +979,32 @@ describe('PASSTHROUGH_COMMANDS set', () => {
     expect(resolvePassthroughCommands('app-2').has('/goal')).toBe(true);
   });
 
+  it('exposes /effort globally to every CLI (best-effort passthrough)', () => {
+    // /effort 放在全局 PASSTHROUGH_COMMANDS,而非某个 adapter 的 defaultPassthroughCommands
+    // ——所有 CLI 都尽力透传(Claude 家族 / Codex 原生支持;其它 CLI 认不得顶多回
+    // unknown-command,不崩溃)。未来新 CLI 零改动自动继承。
+    expect(PASSTHROUGH_COMMANDS.has('/effort')).toBe(true);
+    expect(resolvePassthroughCommands('app-1').has('/effort')).toBe(true); // claude-code
+    expect(resolvePassthroughCommands('app-2').has('/effort')).toBe(true); // codex
+    // 无 bot 上下文时也回落到全局集合,仍含 /effort。
+    expect(resolvePassthroughCommands(undefined).has('/effort')).toBe(true);
+  });
+
+  it('keeps /effort OUT of the adapter default layer so it never gains cold-start', () => {
+    // 核心语义护栏:冷启动能力(空 topic 里发命令能否拉起新会话)只认 adapter 层的
+    // defaultPassthroughCommands(见 daemon.ts 的 isInitialSessionPassthrough →
+    // resolveAdapterDefaultPassthroughCommands),不认全局 PASSTHROUGH_COMMANDS。
+    // /effort 是「调档」而非「开一段工作」的命令,必须留在全局层、绝不进 adapter 层,
+    // 否则空话题单发 /effort 会凭空 spawn 一个没活干的会话。这条断言锁住该语义:
+    // 即使有人日后误把 /effort 加回某个 adapter 的 default,resolvePassthroughCommands
+    // 层的可见性测试仍会全绿(全局也有),唯有这里能抓住回归。
+    expect(resolveAdapterDefaultPassthroughCommands('app-1')).not.toContain('/effort'); // claude-code
+    expect(resolveAdapterDefaultPassthroughCommands('app-2')).not.toContain('/effort'); // codex
+    // /goal 相反:它是「开启目标工作」的命令,刻意留在 adapter 层保留冷启动语义。
+    expect(resolveAdapterDefaultPassthroughCommands('app-1')).toContain('/goal');
+    expect(resolveAdapterDefaultPassthroughCommands('app-2')).toContain('/goal');
+  });
+
   it('does not expose Codex interactive /title through the Lark channel', () => {
     expect(PASSTHROUGH_COMMANDS.has('/title')).toBe(false);
     expect(DAEMON_COMMANDS.has('/title')).toBe(false);