diff --git a/src/index.ts b/src/index.ts
index f30b347..5ef5eb6 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -402,7 +402,11 @@ export function apply(ctx: Context, config: Config = {}): void {
         writeJson(res, 404, { ok: false, reason: 'session-not-found' })
         return
       }
-      const events = session.events as readonly SessionEventLike[]
+      // dsh-session >= 0.1.2-rc.1 removed the `events` property; prefer the
+      // public snapshotEvents() API and fall back to the legacy property.
+      const events: readonly SessionEventLike[] = typeof session.snapshotEvents === 'function'
+        ? session.snapshotEvents()
+        : session.events ?? []
       const { totals, rounds } = foldRounds(events, resolver)
       const compactions = foldCompactions(events, resolver)
       writeJson(res, 200, { ok: true, sessionId, totals, rounds, compactions })
diff --git a/tests/rounds.test.mjs b/tests/rounds.test.mjs
index 9515347..1aa05a9 100644
--- a/tests/rounds.test.mjs
+++ b/tests/rounds.test.mjs
@@ -227,3 +227,63 @@ test('/usage route returns rounds with cost and timing', async () => {
   assert.equal(body.rounds[0].cost.usd.total, 0.66)
   assert.equal(body.rounds[0].cost.unknownModel, false)
 })
+
+/** 构造一个「只暴露 snapshotEvents()、不暴露 events」的 session 句柄，模拟 dsh-session >= 0.1.2-rc.1。 */
+function snapshotSession(events) {
+  return {
+    id: 'session-test',
+    // 新版 dsh-session 移除了 events 属性，只剩 snapshotEvents()。
+    get events() { throw new Error('session.events was removed in dsh-session >= 0.1.2-rc.1') },
+    snapshotEvents() { return events },
+  }
+}
+
+test('/usage route prefers snapshotEvents() when the new API is present', async () => {
+  const events = [
+    { type: 'turn/start', seq: 1, time: 1_000, data: { turn: 1 } },
+    { type: 'request/context', seq: 2, time: 1_010, data: { provider: 'deepseek', model: 'deepseek-v4-pro' } },
+    { type: 'assistant/message', seq: 3, time: 2_000, data: { turn: 1, step: 0, usage: { inputTokens: 1_000_000, outputTokens: 0 } } },
+    { type: 'turn/end', seq: 4, time: 5_000, data: { turn: 1, reason: { kind: 'completed' } } },
+  ]
+  const routes = new Map()
+  apply({
+    effect(setup) { setup() },
+    get() { return undefined },
+    webServer: { register(route) { routes.set(route.path, route); return () => {} } },
+    // 有 snapshotEvents、无 events —— 必须走 snapshotEvents() 分支，且绝不触碰 events 属性。
+    sessions: { get(id) { return id === 'session-test' ? snapshotSession(events) : undefined } },
+  })
+
+  const route = routes.get('/dsh-usage-chart/usage')
+  const recorder = responseRecorder()
+  await route.handler({ method: 'GET', url: '/dsh-usage-chart/usage?session=session-test', headers: { host: 'localhost:3000' } }, recorder)
+  assert.equal(recorder.status, 200)
+  const body = JSON.parse(recorder.body)
+  assert.equal(body.ok, true)
+  assert.equal(body.sessionId, 'session-test')
+  // 走 snapshotEvents() 分支：time 字段被消费，durationMs / 峰值计费都应正确。
+  assert.equal(body.rounds.length, 1)
+  assert.equal(body.rounds[0].startedAt, 1_000)
+  assert.equal(body.rounds[0].endedAt, 5_000)
+  assert.equal(body.rounds[0].durationMs, 4_000)
+  assert.equal(body.rounds[0].cost.cny.total, 4.5)
+  assert.equal(body.rounds[0].cost.usd.total, 0.66)
+  assert.equal(Array.isArray(body.compactions), true)
+  // 新分支优先：即便 events 属性仍暴露，也应调用 snapshotEvents() 而非 events。
+  const both = { id: 'session-test', events: [], snapshotEvents: () => events }
+  const bothRoutes = new Map()
+  apply({
+    effect(setup) { setup() },
+    get() { return undefined },
+    webServer: { register(route) { bothRoutes.set(route.path, route); return () => {} } },
+    sessions: { get(id) { return id === 'session-test' ? both : undefined } },
+  })
+  const bothRecorder = responseRecorder()
+  await bothRoutes.get('/dsh-usage-chart/usage').handler(
+    { method: 'GET', url: '/dsh-usage-chart/usage?session=session-test', headers: { host: 'localhost:3000' } },
+    bothRecorder,
+  )
+  const bothBody = JSON.parse(bothRecorder.body)
+  assert.equal(bothBody.rounds.length, 1, '同时暴露 events 与 snapshotEvents 时应优先用 snapshotEvents')
+  assert.equal(bothBody.rounds[0].durationMs, 4_000)
+})
diff --git a/types/cordis.d.ts b/types/cordis.d.ts
index 9fd5897..9e39706 100644
--- a/types/cordis.d.ts
+++ b/types/cordis.d.ts
@@ -47,6 +47,8 @@ export interface LocaleService {
 export interface SessionEventLike {
   type: string
   seq: number
+  /** Unix epoch 毫秒。 */
+  time: number
   data: {
     turn?: number
     step?: number
@@ -56,11 +58,18 @@ export interface SessionEventLike {
 }
 
 /** dsh-session 的 SessionStore 服务（仅声明本插件用到的面）。 */
+export interface SessionHandle {
+  id: string
+  /** 旧版 dsh-session（< 0.1.2-rc.1）的公开事件数组；新版已移除，改为 snapshotEvents()。 */
+  events?: readonly SessionEventLike[]
+  /** 新版 dsh-session（>= 0.1.2-rc.1）的公开事件快照方法。 */
+  snapshotEvents?: () => readonly SessionEventLike[]
+}
 export interface SessionStoreService {
   /** 按 id 查实时会话；不存在返回 undefined。 */
-  get(id: string): { id: string; events: readonly SessionEventLike[] } | undefined
+  get(id: string): SessionHandle | undefined
   /** 所有实时会话（创建顺序）。 */
-  list(): { id: string; events: readonly SessionEventLike[] }[]
+  list(): SessionHandle[]
 }
 
 /** dsh-credentials 的凭据服务（本插件用到的面：按引用解析密钥值）。 */