diff --git a/packages/http-routes/src/errors.ts b/packages/http-routes/src/errors.ts
index 6201054f..72956853 100644
--- a/packages/http-routes/src/errors.ts
+++ b/packages/http-routes/src/errors.ts
@@ -41,6 +41,9 @@ const HTTP_STATUS: Record<ApiErrorCode, number> = {
   [ApiErrorCode.SERVER_ERROR]: 500,
 }
 
+// REST response envelope version; independent from the ChatLab file format version.
+const API_RESPONSE_VERSION = '0.0.2'
+
 export class ApiError extends Error {
   code: ApiErrorCode
   statusCode: number
@@ -138,7 +141,7 @@ export function successResponse<T>(data: T, meta?: Record<string, unknown>) {
     data,
     meta: {
       timestamp: Math.floor(Date.now() / 1000),
-      version: '0.0.2',
+      version: API_RESPONSE_VERSION,
       ...meta,
     },
   }
diff --git a/packages/http-routes/src/routes/rest/session-provider.test.ts b/packages/http-routes/src/routes/rest/session-provider.test.ts
index c018a075..ec9bab45 100644
--- a/packages/http-routes/src/routes/rest/session-provider.test.ts
+++ b/packages/http-routes/src/routes/rest/session-provider.test.ts
@@ -1,6 +1,7 @@
 import assert from 'node:assert/strict'
 import test from 'node:test'
 import Fastify from 'fastify'
+import { CHATLAB_FORMAT_VERSION } from '@openchatlab/shared-types'
 import type { RestSessionProvider } from './session-provider'
 import { registerRestSessionRoutes } from './sessions'
 import { registerSystemRoutes } from './system'
@@ -71,8 +72,9 @@ test('REST routes share one contract with an async Worker-backed provider', asyn
   registerRestSessionRoutes(app, provider)
   await app.ready()
 
-  const [status, sessions, detail, messages, members, overview, sql, exported] = await Promise.all([
+  const [status, schema, sessions, detail, messages, members, overview, sql, exported] = await Promise.all([
     app.inject({ method: 'GET', url: '/api/v1/status' }),
+    app.inject({ method: 'GET', url: '/api/v1/schema' }),
     app.inject({ method: 'GET', url: '/api/v1/sessions' }),
     app.inject({ method: 'GET', url: `/api/v1/sessions/${session.id}` }),
     app.inject({ method: 'GET', url: `/api/v1/sessions/${session.id}/messages?limit=1` }),
@@ -83,6 +85,7 @@ test('REST routes share one contract with an async Worker-backed provider', asyn
   ])
 
   assert.equal(status.json().data.sessionCount, 1)
+  assert.equal(schema.json().data.version, CHATLAB_FORMAT_VERSION)
   assert.deepEqual(sessions.json().data, [session])
   assert.deepEqual(detail.json().data, session)
   assert.equal(messages.json().data.totalPages, 2)
@@ -91,6 +94,7 @@ test('REST routes share one contract with an async Worker-backed provider', asyn
   assert.equal(overview.json().data.messageCount, 2)
   assert.deepEqual(sql.json().data.rows, [[2]])
   assert.deepEqual(exported.json().data.members[0].aliases, ['A'])
+  assert.equal(exported.json().data.chatlab.version, CHATLAB_FORMAT_VERSION)
   assert.equal(exported.json().data.messages[0].sender, 'alice')
 
   const missingSql = await app.inject({
diff --git a/packages/http-routes/src/routes/rest/sessions.ts b/packages/http-routes/src/routes/rest/sessions.ts
index 2565d0c0..65727763 100644
--- a/packages/http-routes/src/routes/rest/sessions.ts
+++ b/packages/http-routes/src/routes/rest/sessions.ts
@@ -6,6 +6,7 @@
  */
 
 import type { FastifyInstance } from 'fastify'
+import { CHATLAB_FORMAT_VERSION } from '@openchatlab/shared-types'
 import {
   successResponse,
   errorResponse,
@@ -122,7 +123,7 @@ export function registerRestSessionRoutes(server: FastifyInstance, provider: Res
 
     const chatLabFormat = {
       chatlab: {
-        version: '0.0.2',
+        version: CHATLAB_FORMAT_VERSION,
         exportedAt: Math.floor(Date.now() / 1000),
         generator: 'ChatLab API',
       },
diff --git a/packages/http-routes/src/routes/rest/system.ts b/packages/http-routes/src/routes/rest/system.ts
index 229ae205..26978fbe 100644
--- a/packages/http-routes/src/routes/rest/system.ts
+++ b/packages/http-routes/src/routes/rest/system.ts
@@ -6,6 +6,7 @@
  */
 
 import type { FastifyInstance } from 'fastify'
+import { CHATLAB_FORMAT_VERSION } from '@openchatlab/shared-types'
 import { successResponse } from '../../errors'
 
 export interface SystemRouteContext {
@@ -33,7 +34,7 @@ export function registerSystemRoutes(server: FastifyInstance, ctx: SystemRouteCo
   server.get('/api/v1/schema', async () => {
     return successResponse({
       format: 'ChatLab Format',
-      version: '0.0.2',
+      version: CHATLAB_FORMAT_VERSION,
       spec: {
         chatlab: {
           type: 'object',
diff --git a/packages/node-runtime/src/export/format-exporter.ts b/packages/node-runtime/src/export/format-exporter.ts
index 81a5d40d..9d648606 100644
--- a/packages/node-runtime/src/export/format-exporter.ts
+++ b/packages/node-runtime/src/export/format-exporter.ts
@@ -4,6 +4,7 @@
  */
 
 import type { DatabaseAdapter } from '@openchatlab/core'
+import { CHATLAB_FORMAT_VERSION } from '@openchatlab/shared-types'
 import { appLogger } from '../logging/app-logger'
 
 export type ExportFormat = 'txt' | 'json' | 'markdown'
@@ -141,7 +142,7 @@ function exportAsJson(
 
   const data = {
     chatlab: {
-      version: '0.0.2',
+      version: CHATLAB_FORMAT_VERSION,
       exportedAt: Math.floor(Date.now() / 1000),
       generator: 'ChatLab',
     },
diff --git a/packages/node-runtime/src/merger/__tests__/merger.test.ts b/packages/node-runtime/src/merger/__tests__/merger.test.ts
index 7b695468..13d075f4 100644
--- a/packages/node-runtime/src/merger/__tests__/merger.test.ts
+++ b/packages/node-runtime/src/merger/__tests__/merger.test.ts
@@ -1,8 +1,12 @@
 import { describe, it } from 'node:test'
 import assert from 'node:assert/strict'
+import Database from 'better-sqlite3'
 import { checkConflictsFromSources, buildMergedOutput, serializeChatLabToJsonl } from '../index'
+import { exportSessionToJson } from '../temp-db'
 import type { MergerDataSource, MergerSourceMeta } from '../index'
 import type { MergerMember, MergerMessage } from '@openchatlab/core'
+import { CHATLAB_FORMAT_VERSION } from '@openchatlab/shared-types'
+import { BetterSqliteAdapter } from '../../better-sqlite3-adapter'
 
 function createMockSource(
   meta: MergerSourceMeta,
@@ -91,6 +95,7 @@ describe('buildMergedOutput', () => {
     )
 
     assert.ok(result.success)
+    assert.equal(result.chatLabData.chatlab.version, CHATLAB_FORMAT_VERSION)
     assert.equal(result.chatLabData.messages.length, 3)
     assert.equal(result.chatLabData.messages[0].timestamp, 100)
     assert.equal(result.chatLabData.messages[1].timestamp, 200)
@@ -145,7 +150,7 @@ describe('serializeChatLabToJsonl', () => {
 
     const header = JSON.parse(lines[0])
     assert.equal(header._type, 'header')
-    assert.ok(header.chatlab)
+    assert.equal(header.chatlab.version, CHATLAB_FORMAT_VERSION)
     assert.ok(header.meta)
 
     const member = JSON.parse(lines[1])
@@ -157,3 +162,44 @@ describe('serializeChatLabToJsonl', () => {
     assert.equal(msg.content, 'hi')
   })
 })
+
+describe('exportSessionToJson', () => {
+  it('uses the current ChatLab format version', () => {
+    const rawDb = new Database(':memory:')
+    rawDb.exec(`
+      CREATE TABLE meta (
+        name TEXT NOT NULL,
+        platform TEXT NOT NULL,
+        type TEXT NOT NULL,
+        group_id TEXT,
+        group_avatar TEXT
+      );
+      CREATE TABLE member (
+        id INTEGER PRIMARY KEY,
+        platform_id TEXT NOT NULL,
+        account_name TEXT,
+        group_nickname TEXT,
+        avatar TEXT
+      );
+      CREATE TABLE message (
+        sender_id INTEGER NOT NULL,
+        sender_account_name TEXT,
+        sender_group_nickname TEXT,
+        ts INTEGER NOT NULL,
+        type INTEGER NOT NULL,
+        content TEXT
+      );
+      INSERT INTO meta (name, platform, type) VALUES ('Test', 'qq', 'group');
+      INSERT INTO member (id, platform_id, account_name) VALUES (1, 'alice', 'Alice');
+      INSERT INTO message (sender_id, sender_account_name, ts, type, content)
+      VALUES (1, 'Alice', 100, 0, 'Hello');
+    `)
+
+    try {
+      const exported = exportSessionToJson(new BetterSqliteAdapter(rawDb))
+      assert.equal(exported.chatlab.version, CHATLAB_FORMAT_VERSION)
+    } finally {
+      rawDb.close()
+    }
+  })
+})
diff --git a/packages/node-runtime/src/merger/index.ts b/packages/node-runtime/src/merger/index.ts
index dcfc1a64..d27ede2c 100644
--- a/packages/node-runtime/src/merger/index.ts
+++ b/packages/node-runtime/src/merger/index.ts
@@ -17,6 +17,7 @@ import {
   type MergedMember,
   type MergedMessage,
 } from '@openchatlab/core'
+import { CHATLAB_FORMAT_VERSION } from '@openchatlab/shared-types'
 
 // ==================== Data source abstraction ====================
 
@@ -49,7 +50,7 @@ export interface MergeSourceInfo {
 }
 
 export interface ChatLabHeader {
-  version: string
+  version: typeof CHATLAB_FORMAT_VERSION
   exportedAt: number
   generator: string
   description: string
@@ -172,7 +173,7 @@ export function buildMergedOutput(
 
   const chatLabData: ChatLabOutput = {
     chatlab: {
-      version: '0.0.1',
+      version: CHATLAB_FORMAT_VERSION,
       exportedAt: Math.floor(Date.now() / 1000),
       generator: 'ChatLab Merge Tool',
       description: `Merged from ${dataSources.length} files`,
diff --git a/packages/node-runtime/src/merger/temp-db.ts b/packages/node-runtime/src/merger/temp-db.ts
index 1c5f4f02..4ead4920 100644
--- a/packages/node-runtime/src/merger/temp-db.ts
+++ b/packages/node-runtime/src/merger/temp-db.ts
@@ -11,7 +11,7 @@
 import * as fs from 'fs'
 import * as path from 'path'
 import type { DatabaseAdapter } from '@openchatlab/core'
-import type { ParsedMember, ParsedMessage } from '@openchatlab/shared-types'
+import { CHATLAB_FORMAT_VERSION, type ParsedMember, type ParsedMessage } from '@openchatlab/shared-types'
 import type { MergerDataSource, MergerSourceMeta } from './index'
 import type { MergerMember, MergerMessage } from '@openchatlab/core'
 
@@ -291,7 +291,7 @@ function createDataSourceFromReader(reader: TempDbReader): MergerDataSource {
 // ==================== Session export ====================
 
 export interface ExportedSession {
-  chatlab: { version: string; exportedAt: number; generator: string; description: string }
+  chatlab: { version: typeof CHATLAB_FORMAT_VERSION; exportedAt: number; generator: string; description: string }
   meta: { name: string; platform: string; type: string; groupId?: string; groupAvatar?: string }
   members: Array<{ platformId: string; accountName: string; groupNickname?: string; avatar?: string }>
   messages: Array<{
@@ -339,7 +339,7 @@ export function exportSessionToJson(db: DatabaseAdapter): ExportedSession {
 
   return {
     chatlab: {
-      version: '0.0.1',
+      version: CHATLAB_FORMAT_VERSION,
       exportedAt: Math.floor(Date.now() / 1000),
       generator: 'ChatLab Export',
       description: `Exported from session: ${meta.name}`,
diff --git a/packages/shared-types/chatlab-format.ts b/packages/shared-types/chatlab-format.ts
new file mode 100644
index 00000000..04459f88
--- /dev/null
+++ b/packages/shared-types/chatlab-format.ts
@@ -0,0 +1,11 @@
+/** ChatLab 当前生成文件时使用的格式版本。 */
+export const CHATLAB_FORMAT_VERSION = '0.0.2' as const
+
+/** ChatLab 当前可以读取和验证的历史格式版本。 */
+export const CHATLAB_SUPPORTED_FORMAT_VERSIONS = ['0.0.1', CHATLAB_FORMAT_VERSION] as const
+
+export type ChatLabFormatVersion = (typeof CHATLAB_SUPPORTED_FORMAT_VERSIONS)[number]
+
+export function isSupportedChatLabFormatVersion(version: string): version is ChatLabFormatVersion {
+  return (CHATLAB_SUPPORTED_FORMAT_VERSIONS as readonly string[]).includes(version)
+}
diff --git a/packages/shared-types/index.ts b/packages/shared-types/index.ts
index 9d4212c2..4e883482 100644
--- a/packages/shared-types/index.ts
+++ b/packages/shared-types/index.ts
@@ -78,6 +78,13 @@ export enum ChatType {
   PRIVATE = 'private',
 }
 
+export {
+  CHATLAB_FORMAT_VERSION,
+  CHATLAB_SUPPORTED_FORMAT_VERSIONS,
+  isSupportedChatLabFormatVersion,
+  type ChatLabFormatVersion,
+} from './chatlab-format'
+
 // ==================== AI Assistants ====================
 
 export const GENERAL_ASSISTANT_IDS = ['general_cn', 'general_tw', 'general_en', 'general_ja'] as const
diff --git a/src/types/format.ts b/src/types/format.ts
index d4526a4a..89d4a4d8 100644
--- a/src/types/format.ts
+++ b/src/types/format.ts
@@ -11,7 +11,7 @@ import type { ChatPlatform, ChatType, MessageType, MemberRole } from './base'
  * ChatLab 格式版本信息
  */
 export interface ChatLabHeader {
-  version: string // 格式版本，如 "0.0.1"
+  version: string // 格式版本，如 "0.0.2"
   exportedAt: number // 导出时间戳（秒）
   generator?: string // 生成工具名称（可选）
   description?: string // 描述信息（可选，自定义内容）
diff --git a/tests/chatlab-json-export-roundtrip.test.ts b/tests/chatlab-json-export-roundtrip.test.ts
index e85ef2d0..6508f1ca 100644
--- a/tests/chatlab-json-export-roundtrip.test.ts
+++ b/tests/chatlab-json-export-roundtrip.test.ts
@@ -5,6 +5,7 @@ import { join } from 'node:path'
 import test from 'node:test'
 import Database from 'better-sqlite3'
 import { detectFormat, parseFileSync } from '@openchatlab/parser'
+import { CHATLAB_FORMAT_VERSION } from '@openchatlab/shared-types'
 import { CHAT_DB_SCHEMA } from '../packages/core/src/schema/tables'
 import { BetterSqliteAdapter } from '../packages/node-runtime/src/better-sqlite3-adapter'
 import { exportWithFormat } from '../packages/node-runtime/src/export/format-exporter'
@@ -60,7 +61,7 @@ test('exports JSON as ChatLab format that can be parsed for re-import', async ()
 
     assert.equal(result.success, true)
     const exported = JSON.parse(result.content)
-    assert.equal(exported.chatlab.version, '0.0.2')
+    assert.equal(exported.chatlab.version, CHATLAB_FORMAT_VERSION)
     assert.equal(exported.meta.ownerId, 'alice')
     assert.equal(exported.meta.sourceSessionId, 'session-1')
     assert.deepEqual(exported.members[0].aliases, ['Alice'])