diff --git a/app/src/adapt.js b/app/src/adapt.js
index 3e16b6f..91dc877 100644
--- a/app/src/adapt.js
+++ b/app/src/adapt.js
@@ -28,6 +28,7 @@ export function adaptProject(p) {
     state, pending: s.pending || 0, agents: s.executing || 0,
     // 透传给 ConfigPanel 用的原始字段
     model: p.model, verifyCmd: p.verifyCmd, maxRetries: p.maxRetries, repoPath: p.repoPath,
+    logo: p.logo, budgetUsd: p.budgetUsd ?? null, budgetPeriod: p.budgetPeriod ?? 'month',
   };
 }
 
@@ -135,14 +136,20 @@ export function deriveGlobal(projects, agentsResp) {
   };
 }
 
-// 跨项目 agent 概览。token/成本属 ⑧ 标 ★ 的新 /api/usage（预算特性），暂留 0。
-export function deriveAgentSummary(projects, agentsResp) {
+// 跨项目 agent 概览。token/成本来自 /api/usage 的 cost 明细（按当期窗口聚合）。
+export function deriveAgentSummary(projects, agentsResp, cost) {
+  const byPid = new Map((cost?.byProject || []).map((c) => [c.projectId, c]));
+  const tokensTotal = (cost?.byProject || []).reduce((sum, c) => sum + (c.tokens || 0), 0);
   return {
-    tokensWeek: 0, runsWeek: 0, costWeek: 0, activeNow: agentsResp?.totalActive ?? 0,
-    byProject: projects.map((p) => ({
-      id: p.id, name: p.name, hue: p.hue,
-      active: p.agents || 0, runs: 0, tokens: 0,
-    })),
+    tokensWeek: tokensTotal, runsWeek: 0, costWeek: cost?.total || 0, activeNow: agentsResp?.totalActive ?? 0,
+    byProject: projects.map((p) => {
+      const c = byPid.get(p.id);
+      return {
+        id: p.id, name: p.name, hue: p.hue,
+        active: p.agents || 0, runs: 0,
+        tokens: c?.tokens || 0, cost: c?.costUsd || 0,
+      };
+    }),
   };
 }
 
diff --git a/app/src/app.jsx b/app/src/app.jsx
index 16f736e..eaeb96c 100644
--- a/app/src/app.jsx
+++ b/app/src/app.jsx
@@ -154,6 +154,10 @@ export function App() {
       if (!evt.projectId || evt.projectId === currentId) {
         setEventsRaw((list) => [evt, ...list].slice(0, 60));
       }
+      if (evt.type === 'budget.exceeded') {
+        const pay = evt.payload || {};
+        toast('warn', `⚠ 项目超预算已暂停 · 已用 $${(pay.spend ?? 0).toFixed?.(2) ?? pay.spend} / $${pay.budget}`);
+      }
       clearTimeout(refreshTimer.current);
       refreshTimer.current = setTimeout(() => {
         loadProject(currentId);
@@ -178,7 +182,7 @@ export function App() {
   const events = eventsRaw.map(adaptEvent);
   const quota = adaptQuota(usage);
   const global = deriveGlobal(projects, agentsResp);
-  const agentSummary = deriveAgentSummary(projects, agentsResp);
+  const agentSummary = deriveAgentSummary(projects, agentsResp, usage?.cost);
   const NONTERMINAL = (s) => !['done', 'cancelled', 'decomposed'].includes(s);
   const counts = {
     gate: gates.length,
@@ -240,7 +244,7 @@ export function App() {
           counts={counts}
           onSync={onSync}
           onToggleConfig={() => setShowConfig(!showConfig)} /> : null}
-        {showConfig && project ? <window.MaestroKitConfigPanel project={project} t={t}
+        {showConfig && project ? <window.MaestroKitConfigPanel project={project} t={t} lang={lang}
           onSave={saveConfig}
           onSync={onSync}
           onClose={() => setShowConfig(false)} /> : null}
diff --git a/design/ui_kits/console/Topbar.jsx b/design/ui_kits/console/Topbar.jsx
index 3db99ee..c8922ff 100644
--- a/design/ui_kits/console/Topbar.jsx
+++ b/design/ui_kits/console/Topbar.jsx
@@ -107,16 +107,23 @@ function Topbar({ project, counts, onSync, onToggleConfig, t, theme, onToggleThe
   );
 }
 
-function ConfigPanel({ project, onSave, onClose, onSync, t }) {
+function ConfigPanel({ project, onSave, onClose, onSync, t, lang }) {
   const { Button, Input, Select } = window.MaestroDesignSystem_a6a290;
   const [concurrency, setConcurrency] = React.useState(String(project.concurrency));
   const [autonomy, setAutonomy] = React.useState(project.autonomy);
   const [logo, setLogo] = React.useState(project.logo || '');
   const [verifyCmd, setVerifyCmd] = React.useState(project.verifyCmd || '');
   const [model, setModel] = React.useState(project.model || '');
+  const [budgetUsd, setBudgetUsd] = React.useState(project.budgetUsd != null ? String(project.budgetUsd) : '');
+  const [budgetPeriod, setBudgetPeriod] = React.useState(project.budgetPeriod || 'month');
+  const BL = lang === 'en'
+    ? { budget: 'Budget $ (empty=∞)', period: 'Period', day: 'Daily', month: 'Monthly', ph: 'e.g. 20' }
+    : { budget: '预算 $（空=不限）', period: '周期', day: '按天', month: '按月', ph: '如 20' };
   const save = () => onSave({
     concurrency: Number(concurrency), autonomy,
     logo: logo || null, verifyCmd: verifyCmd || null, model: model || null,
+    budgetUsd: budgetUsd.trim() === '' ? null : Number(budgetUsd),
+    budgetPeriod,
   });
   return (
     <section style={{ position: 'relative', zIndex: 30, background: 'var(--panel)', border: '1px solid var(--line)', borderRadius: 6, padding: '12px 14px', marginTop: 12, animation: 'maestro-rise .18s ease both' }}>
@@ -134,6 +141,11 @@ function ConfigPanel({ project, onSave, onClose, onSync, t }) {
         <span style={{ flex: 1, minWidth: 170, display: 'flex' }}><Input label={t.verifyCmd} placeholder={t.verifyPh} value={verifyCmd} onChange={setVerifyCmd} style={{ width: '100%' }} /></span>
         <span style={{ flex: 1, minWidth: 170, display: 'flex' }}><Input label={t.model} placeholder={t.modelPh} value={model} onChange={setModel} style={{ width: '100%' }} /></span>
       </div>
+      <div style={{ display: 'flex', gap: 14, alignItems: 'flex-end', flexWrap: 'wrap', marginTop: 12 }}>
+        <Input label={BL.budget} type="number" placeholder={BL.ph} value={budgetUsd} onChange={setBudgetUsd} width={150} />
+        <Select label={BL.period} value={budgetPeriod} onChange={setBudgetPeriod}
+          options={[{ value: 'day', label: BL.day }, { value: 'month', label: BL.month }]} />
+      </div>
       <div style={{ display: 'flex', alignItems: 'center', gap: 10, marginTop: 10, paddingTop: 10, borderTop: '1px dashed var(--line-soft)' }}>
         <span style={{ fontSize: 10.5, color: 'var(--faint)', letterSpacing: '.06em' }}>{t.lastSync}</span>
         <Button size="xs" onClick={onSync}>⟳ {t.sync}</Button>
diff --git a/src/api/server.ts b/src/api/server.ts
index 60f2ba1..261a385 100644
--- a/src/api/server.ts
+++ b/src/api/server.ts
@@ -83,6 +83,8 @@ export function buildServer(opts: ApiOptions): FastifyInstance {
     if (b.logo !== undefined) patch.logo = b.logo === null || b.logo === '' ? null : String(b.logo);
     if (b.maxRetries !== undefined) patch.maxRetries = Number(b.maxRetries);
     if (b.timeoutMs !== undefined) patch.timeoutMs = Number(b.timeoutMs);
+    if (b.budgetUsd !== undefined) patch.budgetUsd = b.budgetUsd === null || b.budgetUsd === '' ? null : Number(b.budgetUsd);
+    if (b.budgetPeriod !== undefined) patch.budgetPeriod = b.budgetPeriod as 'day' | 'month';
     return projectOut(store.patchProject(id, patch));
   });
 
@@ -145,8 +147,23 @@ export function buildServer(opts: ApiOptions): FastifyInstance {
     return { totalActive: runs.length, agents, usage: await getUsage() };
   });
 
-  // Claude 订阅额度（5 小时 + 周窗口）单独透传；查询失败 → null（前端/CLI 降级显示）
-  app.get('/api/usage', async () => await getUsage());
+  // 用量：Claude 订阅额度（5h+周配额，查询失败→null）+ 成本明细（按项目/模型/总计，按 period 窗口）。
+  // ?period=day|month（默认 month）；?project=<id> 限定单项目成本。
+  app.get('/api/usage', async (req) => {
+    const q = req.query as { period?: string; project?: string };
+    const period = q.period === 'day' ? 'day' : 'month';
+    const quota = await getUsage();
+    const cost = store.costSummary(period, q.project && q.project.trim() ? q.project.trim() : undefined);
+    return { ...(quota ?? {}), cost };
+  });
+
+  // 健康检查：daemon 存活 + DB 可读 + 在途 run 数。
+  app.get('/api/health', () => {
+    let db = true;
+    let inflight = 0;
+    try { inflight = store.activeRuns().length; } catch { db = false; }
+    return { ok: db, db, inflight, at: new Date().toISOString() };
+  });
 
   app.get('/api/projects/:id/tasks', (req) => {
     const { id } = req.params as { id: string };
diff --git a/src/daemon/ingest.ts b/src/daemon/ingest.ts
index df89f1f..9dcdc27 100644
--- a/src/daemon/ingest.ts
+++ b/src/daemon/ingest.ts
@@ -173,6 +173,18 @@ function applyRecord(store: Store, log: IngestLogger, taskId: string, runId: str
       return;
     }
 
+    case 'usage': {
+      // token 用量：累加进 run 的 usage/cost（按模型折算），再检当期预算（超额则暂停项目）。
+      const cost = store.setRunUsage(runId, rec.usage, rec.model);
+      const task = store.getTask(taskId);
+      if (task) {
+        const exceeded = store.enforceBudget(task.projectId);
+        if (exceeded) log.info(`项目 ${task.projectId} 当期成本超预算，已自动暂停`);
+      }
+      log.info(`task=${taskId} run=${runId} 用量入账 model=${rec.model} 累计成本=$${cost.toFixed(4)}`);
+      return;
+    }
+
     case 'done':
       // worker 即将退出：终态标记。run 已由 result/failed 收尾，这里无须额外 DB 写。
       log.info(`task=${taskId} run=${runId} worker 退出`);
diff --git a/src/executor/cc.ts b/src/executor/cc.ts
index a5103ba..9c8bcc5 100644
--- a/src/executor/cc.ts
+++ b/src/executor/cc.ts
@@ -3,6 +3,7 @@ import { homedir } from 'node:os';
 import { join } from 'node:path';
 import { query } from '@anthropic-ai/claude-agent-sdk';
 import { isModelError, pickFallbackModel } from './models.js';
+import { type UsageTokens, EMPTY_USAGE, addUsage } from '../model/pricing.js';
 
 /** 转录目录：<MAESTRO_DATA_DIR 或 ~/.maestro>/transcripts */
 export function transcriptDir(): string {
@@ -27,6 +28,7 @@ export interface CCResult {
   transcriptRef: string;
   modelUsed: string;           // 实际使用的模型（发生回退时为回退模型）
   fellBack: boolean;
+  usage: UsageTokens;          // 本 run 的 token 用量（含 resume/回退累计），供预算成本折算
   error?: string;
 }
 
@@ -34,6 +36,7 @@ interface AttemptResult {
   ok: boolean;
   finalText: string;
   sessionId: string | null;
+  usage: UsageTokens;          // 本次会话的 token 用量（result 消息提供；失败/无 result 时为空）
   error?: string;
   /**
    * 失败是否属于「会话异常中断」——即流式断了 / 没收到 result 就结束（SDK 偶发抖动）。
@@ -65,6 +68,7 @@ async function attempt(
   let sawResult = false;
   let resumable = false;
   let timedOut = false;
+  let usage: UsageTokens = { ...EMPTY_USAGE };
 
   const abort = new AbortController();
   const timeoutMs = extra?.timeoutMs ?? opts.timeoutMs;
@@ -91,6 +95,18 @@ async function attempt(
       if (typeof sid === 'string' && sid) sessionId = sid;
       if (message.type === 'result') {
         sawResult = true;
+        const u = (message as { usage?: unknown }).usage as {
+          input_tokens?: number; output_tokens?: number;
+          cache_read_input_tokens?: number; cache_creation_input_tokens?: number;
+        } | undefined;
+        if (u) {
+          usage = {
+            input: u.input_tokens ?? 0,
+            output: u.output_tokens ?? 0,
+            cacheRead: u.cache_read_input_tokens ?? 0,
+            cacheWrite: u.cache_creation_input_tokens ?? 0,
+          };
+        }
         if (message.subtype === 'success' && !message.is_error) {
           resultOk = true;
           const txt = (message as { result?: unknown }).result;
@@ -116,8 +132,8 @@ async function attempt(
     clearTimeout(killer);
   }
 
-  if (!resultOk) return { ok: false, finalText: '', sessionId, error: resultError ?? '未知错误', resumable };
-  return { ok: true, finalText, sessionId };
+  if (!resultOk) return { ok: false, finalText: '', sessionId, usage, error: resultError ?? '未知错误', resumable };
+  return { ok: true, finalText, sessionId, usage };
 }
 
 /**
@@ -143,12 +159,14 @@ export async function runClaude(opts: CCOptions, queryImpl: CCQuery = query): Pr
     let r = await attempt(opts, opts.model, out, queryImpl);
     let modelUsed = opts.model;
     let fellBack = false;
+    let usage = r.usage;          // 累计各次尝试（resume/回退）的 token 用量
 
     // 1. SDK 抖动续跑：会话异常中断 + 有 sessionId + 非模型错误（那归回退处理） + 未关闭
     if (!r.ok && r.resumable && r.sessionId && !isModelError(r.error ?? '') && process.env.MAESTRO_SDK_RESUME !== '0') {
       out.write(`${JSON.stringify({ type: 'maestro.session_resume', sessionId: r.sessionId, reason: r.error })}\n`);
       const remaining = Math.max(opts.timeoutMs - (Date.now() - t0), RESUME_MIN_TIMEOUT_MS);
       r = await attempt(opts, opts.model, out, queryImpl, { resume: r.sessionId, timeoutMs: remaining });
+      usage = addUsage(usage, r.usage);
     }
 
     if (!r.ok && r.error && isModelError(r.error)) {
@@ -156,6 +174,7 @@ export async function runClaude(opts: CCOptions, queryImpl: CCQuery = query): Pr
       if (fb) {
         out.write(`${JSON.stringify({ type: 'maestro.model_fallback', from: opts.model, to: fb, reason: r.error })}\n`);
         r = await attempt(opts, fb, out, queryImpl);
+        usage = addUsage(usage, r.usage);
         modelUsed = fb;
         fellBack = true;
       }
@@ -169,6 +188,7 @@ export async function runClaude(opts: CCOptions, queryImpl: CCQuery = query): Pr
       transcriptRef,
       modelUsed,
       fellBack,
+      usage,
       ...(r.error ? { error: fellBack ? `${r.error}（已回退至 ${modelUsed} 重试）` : r.error } : {}),
     };
   } finally {
diff --git a/src/executor/pipeline.ts b/src/executor/pipeline.ts
index a8f8920..3acece0 100644
--- a/src/executor/pipeline.ts
+++ b/src/executor/pipeline.ts
@@ -14,6 +14,7 @@
 //   （worker 退出）                                      → emit done
 
 import type { JobSpec, OutboxPayload, ReviewReport, DecomposeResult } from './protocol.js';
+import type { UsageTokens } from '../model/types.js';
 import { createWorktree, worktreeDiff, git, type WorktreeDiff, type WorktreeInfo } from './worktree.js';
 import { runTask, runPlanner, runConflict, type RunnerFn, type PlannerFn } from './runner.js';
 import { runVerify, type VerifyFn } from './verify.js';
@@ -78,15 +79,25 @@ async function runOneReview(
   wt: WorktreeInfo,
   reviewRunId: string,
   executorReport: string,
+  emit: Emit,
 ): Promise<ReviewReport> {
   try {
     const rv = await fn(job.task, job.project, wt, reviewRunId, executorReport);
+    emitUsage(emit, rv);  // 复审也耗 token，计入本 run 成本
     return { summary: rv.summary, verdict: rv.verdict, transcriptRef: rv.transcriptRef };
   } catch (e) {
     return { summary: `自动复审失败：${(e as Error).message}`, verdict: null, transcriptRef: null };
   }
 }
 
+/** 把一次 CC 的 token 用量发成 usage outbox 记录（有用量才发；daemon ingest → 累加成本）。 */
+function emitUsage(emit: Emit, r: { usage?: UsageTokens; modelUsed?: string }): void {
+  const u = r.usage;
+  if (!u || !r.modelUsed) return;
+  if (u.input + u.output + u.cacheRead + u.cacheWrite <= 0) return;
+  emit({ type: 'usage', usage: u, model: r.modelUsed });
+}
+
 /**
  * 纯执行管线。复刻旧 in-process 流程的【执行与产出】，但所有 store.* 改成 emit(outbox)：
  *  1. createWorktree
@@ -121,6 +132,7 @@ export async function runPipeline(job: JobSpec, deps: PipelineDeps = realDeps, e
   // 2. 执行
   emit({ type: 'phase', phase: 'executing' });
   const rr = await deps.runTask(job.task, job.project, wt, job.runId);
+  emitUsage(emit, rr);
   if (!rr.ok) {
     emit({ type: 'failed', error: rr.error ?? '执行失败', transcriptRef: rr.transcriptRef, sessionId: rr.sessionId });
     emit({ type: 'done' });
@@ -144,8 +156,8 @@ export async function runPipeline(job: JobSpec, deps: PipelineDeps = realDeps, e
   emit({ type: 'phase', phase: 'reviewing' });
   const report = rr.finalText ?? '';
   const [code, security] = await Promise.all([
-    runOneReview(deps.reviewCode, job, wt, `${job.runId}.review`, report),
-    runOneReview(deps.reviewSecurity, job, wt, `${job.runId}.security`, report),
+    runOneReview(deps.reviewCode, job, wt, `${job.runId}.review`, report, emit),
+    runOneReview(deps.reviewSecurity, job, wt, `${job.runId}.security`, report, emit),
   ]);
 
   // 6. 成功终态
@@ -172,6 +184,7 @@ async function runPlannerPipeline(job: JobSpec, deps: PipelineDeps, emit: Emit):
   const kind = job.runKind === 'planner-spec' ? 'spec' : 'decompose';
   emit({ type: 'phase', phase: kind === 'spec' ? 'speccing' : 'decomposing' });
   const r = await deps.runPlanner(job.task, job.project, kind, job.runId);
+  emitUsage(emit, r);
   if (!r.ok || !r.finalText) {
     emit({ type: 'failed', error: r.error ?? 'planner 无输出', transcriptRef: r.transcriptRef, sessionId: r.sessionId });
     emit({ type: 'done' });
@@ -234,6 +247,7 @@ async function runConflictPipeline(job: JobSpec, deps: PipelineDeps, emit: Emit)
   // 4. CC 解冲突
   emit({ type: 'phase', phase: 'resolving' });
   const rr = await deps.runConflict(job.task, job.project, wt, job.runId, conflictFiles);
+  emitUsage(emit, rr);
   if (!rr.ok) {
     emit({ type: 'failed', error: rr.error ?? '解冲突失败', transcriptRef: rr.transcriptRef, sessionId: rr.sessionId });
     emit({ type: 'done' });
@@ -247,8 +261,8 @@ async function runConflictPipeline(job: JobSpec, deps: PipelineDeps, emit: Emit)
   emit({ type: 'phase', phase: 'reviewing' });
   const report = rr.finalText ?? '';
   const [code, security] = await Promise.all([
-    runOneReview(deps.reviewCode, job, wt, `${job.runId}.review`, report),
-    runOneReview(deps.reviewSecurity, job, wt, `${job.runId}.security`, report),
+    runOneReview(deps.reviewCode, job, wt, `${job.runId}.review`, report, emit),
+    runOneReview(deps.reviewSecurity, job, wt, `${job.runId}.security`, report, emit),
   ]);
 
   // 7. 成功终态
diff --git a/src/executor/protocol.ts b/src/executor/protocol.ts
index 684ca8b..89f606a 100644
--- a/src/executor/protocol.ts
+++ b/src/executor/protocol.ts
@@ -14,7 +14,7 @@ import {
 } from 'node:fs';
 import { homedir } from 'node:os';
 import { join } from 'node:path';
-import type { Project, Task, ReviewVerdict } from '../model/types.js';
+import type { Project, Task, ReviewVerdict, UsageTokens } from '../model/types.js';
 
 /** 数据根目录（与 worktree.ts 同约定）：<MAESTRO_DATA_DIR 或 ~/.maestro> */
 function dataDir(): string {
@@ -128,6 +128,8 @@ export type OutboxRecord =
       }>;
       transcriptRef: string | null; sessionId: string | null;
     }
+  // token 用量（任意 CC run 结束后发；daemon ingest → setRunUsage 折算成本，再判预算）
+  | { seq: number; at: string; type: 'usage'; usage: UsageTokens; model: string }
   | { seq: number; at: string; type: 'done' };
 
 /** OutboxRecord 去掉 seq/at（由 appendOutbox 填） */
@@ -138,6 +140,7 @@ export type OutboxPayload =
   | Omit<Extract<OutboxRecord, { type: 'result' }>, 'seq' | 'at'>
   | Omit<Extract<OutboxRecord, { type: 'spec-result' }>, 'seq' | 'at'>
   | Omit<Extract<OutboxRecord, { type: 'decompose-result' }>, 'seq' | 'at'>
+  | Omit<Extract<OutboxRecord, { type: 'usage' }>, 'seq' | 'at'>
   | Omit<Extract<OutboxRecord, { type: 'done' }>, 'seq' | 'at'>;
 
 /** 追加一条 outbox 记录（worker 侧调用）。seq = 现有行数+1（worker 单线程，无并发写）。返回写入的完整记录。 */
diff --git a/src/executor/reviewer.ts b/src/executor/reviewer.ts
index f8699d4..5f09c58 100644
--- a/src/executor/reviewer.ts
+++ b/src/executor/reviewer.ts
@@ -1,4 +1,4 @@
-import type { Project, Task, ReviewVerdict } from '../model/types.js';
+import type { Project, Task, ReviewVerdict, UsageTokens } from '../model/types.js';
 import type { WorktreeInfo } from './worktree.js';
 import { runClaude } from './cc.js';
 import { pickModel } from './models.js';
@@ -11,6 +11,8 @@ export interface ReviewResult {
   verdict: ReviewVerdict | null; // 解析不到 = null
   transcriptRef: string | null;
   sessionId: string | null;
+  modelUsed?: string;
+  usage?: UsageTokens;
 }
 
 /** 复审函数签名（orchestrator 依赖注入点；测试传 mock，生产传 reviewCode/reviewSecurity）。失败时抛错，由 orchestrator 兜底。 */
@@ -144,7 +146,7 @@ export async function runReview(
   if (!cc.finalText.trim()) throw new Error(`${label}未产出最终文本`);
 
   const { summary, verdict } = parseVerdict(cc.finalText);
-  return { summary, verdict, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId };
+  return { summary, verdict, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, modelUsed: cc.modelUsed, usage: cc.usage };
 }
 
 /** code review 入口（kind=reviewer 的 run） */
diff --git a/src/executor/runner.ts b/src/executor/runner.ts
index 8f50bcc..5ff659f 100644
--- a/src/executor/runner.ts
+++ b/src/executor/runner.ts
@@ -1,4 +1,4 @@
-import type { Project, Task } from '../model/types.js';
+import type { Project, Task, UsageTokens } from '../model/types.js';
 import { git, type WorktreeInfo } from './worktree.js';
 import { runClaude } from './cc.js';
 import { pickModel } from './models.js';
@@ -13,6 +13,8 @@ export interface RunnerResult {
   finalText?: string | null;
   /** 实际使用的模型（发生回退时为回退模型） */
   modelUsed?: string;
+  /** 本次 CC 的 token 用量（供预算成本折算） */
+  usage?: UsageTokens;
   error?: string;
 }
 
@@ -83,16 +85,16 @@ export async function runTask(task: Task, project: Project, worktree: WorktreeIn
   });
 
   if (!cc.ok) {
-    return { ok: false, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: null, modelUsed: cc.modelUsed, error: cc.error ?? '未知错误' };
+    return { ok: false, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: null, modelUsed: cc.modelUsed, usage: cc.usage, error: cc.error ?? '未知错误' };
   }
 
   // 兜底：CC 没 commit 时由 runner 代为提交
   try {
     await ensureCommitted(worktree.dir, task);
   } catch (e) {
-    return { ok: false, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: cc.finalText || null, modelUsed: cc.modelUsed, error: `兜底提交失败：${(e as Error).message}` };
+    return { ok: false, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: cc.finalText || null, modelUsed: cc.modelUsed, usage: cc.usage, error: `兜底提交失败：${(e as Error).message}` };
   }
-  return { ok: true, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: cc.finalText || null, modelUsed: cc.modelUsed };
+  return { ok: true, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: cc.finalText || null, modelUsed: cc.modelUsed, usage: cc.usage };
 }
 
 // ───────────────────────── planner（拆解 Hard / 写方案 Medium）─────────────────────────
@@ -104,6 +106,8 @@ export interface PlannerResult {
   transcriptRef: string | null;
   sessionId: string | null;
   finalText: string | null;   // CC 的最终文本：spec=方案正文；decompose=分析 + 末尾 fenced JSON
+  modelUsed?: string;
+  usage?: UsageTokens;
   error?: string;
 }
 
@@ -170,7 +174,7 @@ export async function runPlanner(task: Task, project: Project, kind: PlanKind, r
     permissionMode: 'acceptEdits',          // planner 只读，不会触发编辑；保持工具流不被 prompt 卡住
     allowedTools: ['Read', 'Glob', 'Grep', 'Bash(git log:*)', 'Bash(git diff:*)', 'Bash(git show:*)'], // 纯只读：无 Edit/Write，零副作用
   });
-  return { ok: cc.ok, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: cc.finalText || null, error: cc.error };
+  return { ok: cc.ok, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: cc.finalText || null, modelUsed: cc.modelUsed, usage: cc.usage, error: cc.error };
 }
 
 /** 解冲突任务的提示词：worker 已在 worktree 内触发 git merge 制造冲突态，CC 负责逐个解决。 */
@@ -230,13 +234,13 @@ export async function runConflict(
   });
 
   if (!cc.ok) {
-    return { ok: false, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: null, modelUsed: cc.modelUsed, error: cc.error ?? '解冲突失败' };
+    return { ok: false, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: null, modelUsed: cc.modelUsed, usage: cc.usage, error: cc.error ?? '解冲突失败' };
   }
   // 兜底提交（CC 应已 commit，但防万一）
   try {
     await ensureCommitted(worktree.dir, task);
   } catch (e) {
-    return { ok: false, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: cc.finalText || null, modelUsed: cc.modelUsed, error: `兜底提交失败：${(e as Error).message}` };
+    return { ok: false, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: cc.finalText || null, modelUsed: cc.modelUsed, usage: cc.usage, error: `兜底提交失败：${(e as Error).message}` };
   }
-  return { ok: true, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: cc.finalText || null, modelUsed: cc.modelUsed };
+  return { ok: true, transcriptRef: cc.transcriptRef, sessionId: cc.sessionId, finalText: cc.finalText || null, modelUsed: cc.modelUsed, usage: cc.usage };
 }
diff --git a/src/model/pricing.ts b/src/model/pricing.ts
new file mode 100644
index 0000000..6a064e1
--- /dev/null
+++ b/src/model/pricing.ts
@@ -0,0 +1,50 @@
+// 模型计价（单源）。成本 = Σ(各类 token × 单价)，单价 USD / 每 1M token。
+// 预算系统据此把 run 的 token 用量折算成精确到项目级的成本。价目随官方调整，集中此处维护。
+
+export interface UsageTokens {
+  input: number;      // 非缓存输入 token
+  output: number;     // 输出 token
+  cacheRead: number;  // 缓存命中读取 token
+  cacheWrite: number; // 缓存写入（创建）token
+}
+
+export const EMPTY_USAGE: UsageTokens = { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 };
+
+interface Price { input: number; output: number; cacheRead: number; cacheWrite: number }
+
+// 单价：USD / 1M token
+const MODEL_PRICES: Record<string, Price> = {
+  'claude-opus-4-8': { input: 15, output: 75, cacheRead: 1.5, cacheWrite: 18.75 },
+  'claude-sonnet-4-6': { input: 3, output: 15, cacheRead: 0.3, cacheWrite: 3.75 },
+  'claude-haiku-4-5': { input: 1, output: 5, cacheRead: 0.1, cacheWrite: 1.25 },
+};
+
+// 模型名归一：精确命中优先，否则按已知前缀匹配（容忍日期/区域后缀）
+function priceOf(model: string): Price | null {
+  if (MODEL_PRICES[model]) return MODEL_PRICES[model];
+  for (const key of Object.keys(MODEL_PRICES)) if (model.startsWith(key)) return MODEL_PRICES[key];
+  return null;
+}
+
+/** 把一个 run 的 token 用量按其模型折算成 USD。未知模型 → 0（不阻断，仅成本记 0）。 */
+export function computeCost(model: string, u: UsageTokens): number {
+  const p = priceOf(model);
+  if (!p) return 0;
+  const M = 1_000_000;
+  return (u.input * p.input + u.output * p.output + u.cacheRead * p.cacheRead + u.cacheWrite * p.cacheWrite) / M;
+}
+
+export function addUsage(a: UsageTokens, b: UsageTokens): UsageTokens {
+  return {
+    input: a.input + b.input, output: a.output + b.output,
+    cacheRead: a.cacheRead + b.cacheRead, cacheWrite: a.cacheWrite + b.cacheWrite,
+  };
+}
+
+export function totalTokens(u: UsageTokens): number {
+  return u.input + u.output + u.cacheRead + u.cacheWrite;
+}
+
+export function isKnownModel(model: string): boolean {
+  return priceOf(model) !== null;
+}
diff --git a/src/model/types.ts b/src/model/types.ts
index 7767e55..1873598 100644
--- a/src/model/types.ts
+++ b/src/model/types.ts
@@ -1,5 +1,8 @@
 import type { Complexity } from './complexity.js';
 import type { TaskStatus, GateKind } from './status.js';
+import type { UsageTokens } from './pricing.js';
+
+export type { UsageTokens };
 
 export type Id = string;
 
@@ -31,6 +34,9 @@ export interface Project {
   autoApproveExec?: boolean;      // 双复审 approve 后跳过 exec_review 自动合并（默认 false）
   /** 分项检查命令（JSON，如 {"lint":"npm run lint","typecheck":"npm run typecheck"}）*/
   checks?: string | null;
+  /** 项目级成本预算（按模型×token 折算累计；超额自动暂停）*/
+  budgetUsd?: number | null;      // 当期预算上限 USD（null=不限）
+  budgetPeriod?: 'day' | 'month'; // 预算周期（默认 month）
 }
 
 export interface ApprovalRecord {
@@ -98,6 +104,8 @@ export interface Run {
   error: string | null;
   workerPid: number | null;       // 执行该 run 的 worker 进程 pid（多进程执行；daemon 写，判活用）
   lastSeq: number;                // 已 ingest 的 outbox 最大 seq（daemon 写，幂等游标；重启续读）
+  usage?: UsageTokens | null;     // token 用量（worker 从 SDK 抓取，daemon ingest 落库）
+  costUsd?: number | null;        // 该 run 折算成本 USD（按 model × usage，见 model/pricing.ts）
 }
 
 export type EventType =
@@ -105,6 +113,7 @@ export type EventType =
   | 'approval.requested' | 'approval.granted' | 'approval.rejected'
   | 'run.started' | 'run.finished'
   | 'merge.failed' | 'merge.remediated'
+  | 'budget.exceeded'
   | 'project.synced';
 
 export interface Event {
diff --git a/src/store/db.ts b/src/store/db.ts
index 3d8bf9a..4534ceb 100644
--- a/src/store/db.ts
+++ b/src/store/db.ts
@@ -32,6 +32,10 @@ export function openDb(file: string): Database.Database {
   ensureColumn(db, 'tasks', 'next_eligible_at', 'next_eligible_at TEXT');                      // 持久化退避（多进程执行）
   ensureColumn(db, 'runs', 'worker_pid', 'worker_pid INTEGER');                                // worker 进程 pid
   ensureColumn(db, 'runs', 'last_seq', 'last_seq INTEGER NOT NULL DEFAULT 0');                 // outbox ingest 游标
+  ensureColumn(db, 'runs', 'usage', 'usage TEXT');                                             // token 用量 JSON {input,output,cacheRead,cacheWrite}
+  ensureColumn(db, 'runs', 'cost_usd', 'cost_usd REAL');                                       // 该 run 折算成本 USD（按模型×token）
+  ensureColumn(db, 'projects', 'budget_usd', 'budget_usd REAL');                               // 项目当期预算上限 USD（null=不限）
+  ensureColumn(db, 'projects', 'budget_period', "budget_period TEXT NOT NULL DEFAULT 'month'"); // 预算周期 day|month
   const schema = readFileSync(join(HERE, 'schema.sql'), 'utf8');
   db.exec(schema);
   return db;
diff --git a/src/store/mappers.ts b/src/store/mappers.ts
index 586650b..ff5ab79 100644
--- a/src/store/mappers.ts
+++ b/src/store/mappers.ts
@@ -11,6 +11,7 @@ export interface ProjectRow {
   status: string; created_at: string;
   last_sync_at: string | null; logo: string | null; sort_order: number;
   checks: string | null; auto_approve_plan: number; auto_approve_exec: number;
+  budget_usd: number | null; budget_period: string | null;
 }
 export interface TaskRow {
   id: string; project_id: string; parent_id: string | null; depth: number;
@@ -31,6 +32,7 @@ export interface RunRow {
   status: string; started_at: string; ended_at: string | null;
   transcript_ref: string | null; claude_session_id: string | null; error: string | null;
   worker_pid: number | null; last_seq: number;
+  usage: string | null; cost_usd: number | null;
 }
 export interface EventRow {
   id: string; project_id: string; task_id: string | null; type: string; payload: string; at: string;
@@ -46,6 +48,8 @@ export function rowToProject(r: ProjectRow): Project {
     checks: r.checks ?? null,
     autoApprovePlan: Boolean(r.auto_approve_plan),
     autoApproveExec: Boolean(r.auto_approve_exec),
+    budgetUsd: r.budget_usd ?? null,
+    budgetPeriod: (r.budget_period === 'day' ? 'day' : 'month'),
   };
 }
 
@@ -95,6 +99,8 @@ export function rowToRun(r: RunRow): Run {
     startedAt: r.started_at, endedAt: r.ended_at,
     transcriptRef: r.transcript_ref, claudeSessionId: r.claude_session_id, error: r.error,
     workerPid: r.worker_pid ?? null, lastSeq: r.last_seq ?? 0,
+    usage: r.usage ? (JSON.parse(r.usage) as Run['usage']) : null,
+    costUsd: r.cost_usd ?? null,
   };
 }
 
diff --git a/src/store/schema.sql b/src/store/schema.sql
index 93ca11f..da4c3e6 100644
--- a/src/store/schema.sql
+++ b/src/store/schema.sql
@@ -20,7 +20,9 @@ CREATE TABLE IF NOT EXISTS projects (
   sort_order     INTEGER NOT NULL DEFAULT 0,           -- 侧栏排序（小在前）
   checks             TEXT,                                -- 分项检查命令 JSON（如 {"lint":"npm run lint"}）
   auto_approve_plan  INTEGER NOT NULL DEFAULT 0,         -- 全 easy 子任务时跳过 plan_review（0=关）
-  auto_approve_exec  INTEGER NOT NULL DEFAULT 0          -- 双复审 approve 后跳过 exec_review（0=关）
+  auto_approve_exec  INTEGER NOT NULL DEFAULT 0,         -- 双复审 approve 后跳过 exec_review（0=关）
+  budget_usd         REAL,                                -- 项目当期预算上限 USD（null=不限）
+  budget_period      TEXT NOT NULL DEFAULT 'month'        -- 预算周期 day | month
 );
 
 CREATE TABLE IF NOT EXISTS tasks (
@@ -72,7 +74,9 @@ CREATE TABLE IF NOT EXISTS runs (
   claude_session_id TEXT,
   error             TEXT,
   worker_pid        INTEGER,                          -- 多进程执行：worker 进程 pid（daemon 写，判活用）
-  last_seq          INTEGER NOT NULL DEFAULT 0        -- 已 ingest 的 outbox 最大 seq（幂等游标）
+  last_seq          INTEGER NOT NULL DEFAULT 0,        -- 已 ingest 的 outbox 最大 seq（幂等游标）
+  usage             TEXT,                             -- token 用量 JSON {input,output,cacheRead,cacheWrite}
+  cost_usd          REAL                              -- 该 run 折算成本 USD（按模型×token，见 model/pricing.ts）
 );
 CREATE INDEX IF NOT EXISTS idx_runs_task ON runs(task_id, started_at);
 
diff --git a/src/store/store.ts b/src/store/store.ts
index 3947673..38a7e57 100644
--- a/src/store/store.ts
+++ b/src/store/store.ts
@@ -12,6 +12,7 @@ import {
   type Metrics, type ModelUsage, percentile, ratio, estimateCostUnits, emptyMetrics,
 } from '../model/metrics.js';
 import { resolvedExecutorModels } from '../executor/models.js';
+import { computeCost, addUsage, EMPTY_USAGE, type UsageTokens } from '../model/pricing.js';
 import {
   type TaskStatus, type GateKind, canTransition, initialNextStatus, gateOf, STATUS_LABEL,
 } from '../model/status.js';
@@ -19,6 +20,15 @@ import {
 const now = (): string => new Date().toISOString();
 const id = (prefix: string): string => `${prefix}_${nanoid(12)}`;
 
+/** 预算周期起点（UTC）：day=今日零点 / month=当月 1 号零点。与存储的 ISO 时间戳同基准比较。 */
+function periodStartISO(period: 'day' | 'month'): string {
+  const d = new Date();
+  const start = period === 'day'
+    ? Date.UTC(d.getUTCFullYear(), d.getUTCMonth(), d.getUTCDate())
+    : Date.UTC(d.getUTCFullYear(), d.getUTCMonth(), 1);
+  return new Date(start).toISOString();
+}
+
 export class StoreError extends Error {}
 
 export interface CreateProjectInput {
@@ -34,10 +44,19 @@ export interface PatchProjectInput {
   autonomy?: Autonomy; concurrency?: number; verifyCmd?: string | null;
   model?: string | null; status?: 'active' | 'paused'; logo?: string | null;
   maxRetries?: number; timeoutMs?: number;
+  budgetUsd?: number | null; budgetPeriod?: 'day' | 'month';
 }
 export interface PatchTaskInput {
   title?: string; priority?: number; complexity?: Complexity; deps?: string[];
 }
+/** 成本明细（按项目 / 按模型 / 总计），供 GET /api/usage 与预算判定 */
+export interface CostSummary {
+  period: 'day' | 'month';
+  total: number;
+  byProject: Array<{ projectId: string; costUsd: number; tokens: number }>;
+  byModel: Array<{ model: string; costUsd: number; tokens: number }>;
+}
+
 /** 执行中的 run（联 tasks 取标题/项目），供 GET /api/agents 汇总 */
 export interface ActiveRun {
   runId: string; taskId: string; taskTitle: string; kind: string;
@@ -111,6 +130,7 @@ export class Store {
       status: 'active', created_at: now(),
       last_sync_at: null, logo: null, sort_order: maxOrder + 1,
       checks: null, auto_approve_plan: 0, auto_approve_exec: 0,
+      budget_usd: null, budget_period: 'month',
     };
     this.db.prepare(
       `INSERT INTO projects (id,name,repo_path,default_branch,verify_cmd,autonomy,model,concurrency,max_retries,timeout_ms,status,created_at,last_sync_at,logo,sort_order,checks,auto_approve_plan,auto_approve_exec)
@@ -198,6 +218,18 @@ export class Store {
       }
       sets.push('timeout_ms = @timeout_ms'); args.timeout_ms = patch.timeoutMs;
     }
+    if (patch.budgetUsd !== undefined) {
+      if (patch.budgetUsd !== null && (!Number.isFinite(patch.budgetUsd) || patch.budgetUsd < 0)) {
+        throw new StoreError('budgetUsd 必须是 >=0 的数字或 null');
+      }
+      sets.push('budget_usd = @budget_usd'); args.budget_usd = patch.budgetUsd;
+    }
+    if (patch.budgetPeriod !== undefined) {
+      if (patch.budgetPeriod !== 'day' && patch.budgetPeriod !== 'month') {
+        throw new StoreError('budgetPeriod 必须是 day | month');
+      }
+      sets.push('budget_period = @budget_period'); args.budget_period = patch.budgetPeriod;
+    }
 
     if (sets.length > 0) {
       this.db.prepare(`UPDATE projects SET ${sets.join(', ')} WHERE id = @id`).run(args);
@@ -899,7 +931,7 @@ export class Store {
     const rr: RunRow = {
       id: id('run'), task_id: taskId, kind, worktree: fields.worktree ?? null, branch: fields.branch ?? null,
       status: 'started', started_at: now(), ended_at: null, transcript_ref: null, claude_session_id: null, error: null,
-      worker_pid: null, last_seq: 0,
+      worker_pid: null, last_seq: 0, usage: null, cost_usd: null,
     };
     this.db.prepare(
       `INSERT INTO runs (id,task_id,kind,worktree,branch,status,started_at,ended_at,transcript_ref,claude_session_id,error)
@@ -930,6 +962,76 @@ export class Store {
     this.db.prepare(`UPDATE runs SET last_seq = ? WHERE id = ?`).run(seq, runId);
   }
 
+  /**
+   * 累加 run 的 token 用量并按模型折算成本（USD）。一个 run 可能有多次 CC 调用
+   * （executor + 双复审 / resume / 回退），每次 emit 一条 usage 记录 → 累加。
+   * cost 逐次按各自模型精确折算后求和；usage JSON 存累计 token + 最近模型（byModel 近似）。返回累计成本。
+   */
+  setRunUsage(runId: string, usage: UsageTokens, model: string): number {
+    const cur = this.db.prepare(`SELECT usage, cost_usd FROM runs WHERE id = ?`).get(runId) as
+      { usage: string | null; cost_usd: number | null } | undefined;
+    if (!cur) throw new StoreError(`run 不存在: ${runId}`);
+    const prevUsage: UsageTokens = cur.usage ? JSON.parse(cur.usage) as UsageTokens : EMPTY_USAGE;
+    const nextUsage = addUsage(prevUsage, usage);
+    const nextCost = (cur.cost_usd ?? 0) + computeCost(model, usage);
+    this.db.prepare(`UPDATE runs SET usage = ?, cost_usd = ? WHERE id = ?`)
+      .run(JSON.stringify({ ...nextUsage, model }), nextCost, runId);
+    return nextCost;
+  }
+
+  /** 项目当期累计成本 USD（run.started_at 落在 day|month 窗口内）。 */
+  projectSpend(projectId: string, period: 'day' | 'month'): number {
+    const since = periodStartISO(period);
+    const r = this.db.prepare(
+      `SELECT COALESCE(SUM(r.cost_usd), 0) AS c FROM runs r JOIN tasks t ON t.id = r.task_id
+       WHERE t.project_id = ? AND r.started_at >= ?`,
+    ).get(projectId, since) as { c: number };
+    return r.c;
+  }
+
+  /** 成本明细：按项目 / 按模型 / 总计（period 窗口内，可选限定项目）。 */
+  costSummary(period: 'day' | 'month', projectId?: string): CostSummary {
+    const since = periodStartISO(period);
+    const rows = this.db.prepare(
+      `SELECT t.project_id AS pid, r.usage AS usage, r.cost_usd AS cost
+       FROM runs r JOIN tasks t ON t.id = r.task_id
+       WHERE r.started_at >= ? AND r.cost_usd IS NOT NULL${projectId ? ' AND t.project_id = ?' : ''}`,
+    ).all(...(projectId ? [since, projectId] : [since])) as Array<{ pid: string; usage: string | null; cost: number }>;
+    const byProject = new Map<string, { cost: number; tokens: number }>();
+    const byModel = new Map<string, { cost: number; tokens: number }>();
+    let total = 0;
+    for (const row of rows) {
+      total += row.cost;
+      const u = row.usage ? JSON.parse(row.usage) as UsageTokens & { model?: string } : null;
+      const tokens = u ? u.input + u.output + u.cacheRead + u.cacheWrite : 0;
+      const model = u?.model ?? 'unknown';
+      const bp = byProject.get(row.pid) ?? { cost: 0, tokens: 0 }; bp.cost += row.cost; bp.tokens += tokens; byProject.set(row.pid, bp);
+      const bm = byModel.get(model) ?? { cost: 0, tokens: 0 }; bm.cost += row.cost; bm.tokens += tokens; byModel.set(model, bm);
+    }
+    return {
+      period, total,
+      byProject: [...byProject].map(([pid, v]) => ({ projectId: pid, costUsd: v.cost, tokens: v.tokens })),
+      byModel: [...byModel].map(([model, v]) => ({ model, costUsd: v.cost, tokens: v.tokens })),
+    };
+  }
+
+  /**
+   * 预算护栏：项目当期成本达到预算上限时，置 paused 并广播 budget.exceeded（仅在 active→paused 时广播一次）。
+   * 无预算（budgetUsd 为 null/≤0）则不干预。返回是否已超额（供编排器跳过领取）。
+   */
+  enforceBudget(projectId: string): boolean {
+    const p = this.getProject(projectId);
+    if (!p || p.budgetUsd == null || p.budgetUsd <= 0) return false;
+    const period = p.budgetPeriod ?? 'month';
+    const spend = this.projectSpend(projectId, period);
+    if (spend < p.budgetUsd) return false;
+    if (p.status === 'active') {
+      this.db.prepare(`UPDATE projects SET status = 'paused' WHERE id = ?`).run(projectId);
+      this.emit(projectId, null, 'budget.exceeded', { spend, budget: p.budgetUsd, period });
+    }
+    return true;
+  }
+
   /** 所有进行中的 run（status='started'），联 tasks 取任务标题与项目。 */
   activeRuns(): ActiveRun[] {
     const rows = this.db.prepare(
diff --git a/test/budget.test.ts b/test/budget.test.ts
new file mode 100644
index 0000000..987c116
--- /dev/null
+++ b/test/budget.test.ts
@@ -0,0 +1,64 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { Store } from '../src/store/index.js';
+import { computeCost, addUsage } from '../src/model/pricing.js';
+
+test('pricing: computeCost 按模型×token 折算（USD/1M）', () => {
+  // opus: in15 / out75 → 各 1M token = 15 + 75 = 90
+  assert.equal(computeCost('claude-opus-4-8', { input: 1_000_000, output: 1_000_000, cacheRead: 0, cacheWrite: 0 }), 90);
+  // sonnet: in3 → 2M input = 6
+  assert.equal(computeCost('claude-sonnet-4-6', { input: 2_000_000, output: 0, cacheRead: 0, cacheWrite: 0 }), 6);
+  // haiku: cacheRead 0.1 → 10M = 1
+  assert.equal(computeCost('claude-haiku-4-5', { input: 0, output: 0, cacheRead: 10_000_000, cacheWrite: 0 }), 1);
+  // 未知模型 → 0（不阻断）
+  assert.equal(computeCost('mystery-model', { input: 9_999_999, output: 0, cacheRead: 0, cacheWrite: 0 }), 0);
+  // 前缀匹配（容忍日期后缀）
+  assert.equal(computeCost('claude-opus-4-8-20260101', { input: 1_000_000, output: 0, cacheRead: 0, cacheWrite: 0 }), 15);
+});
+
+test('pricing: addUsage 逐项累加', () => {
+  const a = { input: 1, output: 2, cacheRead: 3, cacheWrite: 4 };
+  assert.deepEqual(addUsage(a, a), { input: 2, output: 4, cacheRead: 6, cacheWrite: 8 });
+});
+
+test('store: setRunUsage 累加成本 + costSummary 聚合', () => {
+  const s = new Store(':memory:');
+  const p = s.createProject({ name: 'b', repoPath: '/tmp/b-' + Math.random() });
+  const t = s.createTask({ projectId: p.id, title: 'x', complexity: 'easy' });
+  const r = s.startRun(t.id, 'executor');
+
+  // 一个 run 内多次 CC 调用（executor + 复审）→ 累加
+  const c1 = s.setRunUsage(r.id, { input: 1_000_000, output: 0, cacheRead: 0, cacheWrite: 0 }, 'claude-opus-4-8');
+  assert.equal(c1, 15);
+  const c2 = s.setRunUsage(r.id, { input: 0, output: 1_000_000, cacheRead: 0, cacheWrite: 0 }, 'claude-opus-4-8');
+  assert.equal(c2, 90);
+
+  const sum = s.costSummary('month');
+  assert.equal(sum.total, 90);
+  assert.equal(sum.byProject.length, 1);
+  assert.equal(sum.byProject[0].projectId, p.id);
+  assert.equal(sum.byProject[0].costUsd, 90);
+  assert.equal(sum.byProject[0].tokens, 2_000_000);
+  s.close();
+});
+
+test('store: enforceBudget 超额 → 暂停项目 + 广播 budget.exceeded', () => {
+  const s = new Store(':memory:');
+  const p = s.createProject({ name: 'b', repoPath: '/tmp/b-' + Math.random() });
+  const t = s.createTask({ projectId: p.id, title: 'x', complexity: 'easy' });
+  const r = s.startRun(t.id, 'executor');
+  s.setRunUsage(r.id, { input: 0, output: 1_000_000, cacheRead: 0, cacheWrite: 0 }, 'claude-opus-4-8'); // $75
+
+  // 无预算 → 不干预
+  assert.equal(s.enforceBudget(p.id), false);
+  assert.equal(s.getProject(p.id)!.status, 'active');
+
+  // 设 $50 上限 → 超额、暂停、发事件
+  s.patchProject(p.id, { budgetUsd: 50, budgetPeriod: 'month' });
+  assert.equal(s.enforceBudget(p.id), true);
+  assert.equal(s.getProject(p.id)!.status, 'paused');
+  const ev = s.listEvents(p.id).find((e) => e.type === 'budget.exceeded');
+  assert.ok(ev, '应有 budget.exceeded 事件');
+  assert.equal((ev!.payload as { budget: number }).budget, 50);
+  s.close();
+});