diff --git a/plugin/lib/anthropic.ts b/plugin/lib/anthropic.ts
new file mode 100644
index 0000000..c04a3a6
--- /dev/null
+++ b/plugin/lib/anthropic.ts
@@ -0,0 +1,224 @@
+/**
+ * Anthropic Claude 额度查询模块
+ *
+ * [输入]: auth.json → anthropic (OAuth access/refresh tokens)
+ * [输出]: 格式化的 5-hour / 7-day 限额使用情况
+ * [定位]: 被 mystatus.ts 调用，处理 Anthropic Claude Pro/Max 账号
+ * [同步]: mystatus.ts, types.ts, utils.ts, i18n.ts
+ *
+ * 技术背景:
+ *   Anthropic 提供了一个内部端点供 Claude Code 使用，用于查询订阅配额：
+ *     GET https://api.anthropic.com/api/oauth/usage
+ *   认证需要通过 OAuth access token (sk-ant-oat01-...) 发送 Bearer header，
+ *   并附带 anthropic-beta 和 User-Agent 头部，否则会返回 401/403。
+ *   注意：该端点目前为内部/未公开接口，行为可能随版本变化。
+ */
+
+import { t } from "./i18n";
+import { type QueryResult, type AnthropicAuthData } from "./types";
+import {
+  createProgressBar,
+  calcRemainPercent,
+  formatDuration,
+  fetchWithTimeout,
+} from "./utils";
+
+// ============================================================================
+// 常量
+// ============================================================================
+
+const ANTHROPIC_USAGE_URL = "https://api.anthropic.com/api/oauth/usage";
+const ANTHROPIC_TOKEN_URL = "https://console.anthropic.com/v1/oauth/token";
+
+/**
+ * Claude Code 官方 OAuth client_id，用于 refresh token 交换。
+ * 来源：Claude Code 官方客户端 OAuth 流程逆向分析（公开已知）。
+ */
+const CLAUDE_CODE_CLIENT_ID = "9d1c250a-e61b-44d9-88ed-5944d1962f5e";
+
+/**
+ * Anthropic beta 标头：激活 oauth/usage 端点所必需，否则返回 401。
+ */
+const ANTHROPIC_BETA = "oauth-2025-04-20";
+
+/**
+ * User-Agent 需要标识为 claude-code，否则服务器会更积极地限速（429）。
+ */
+const ANTHROPIC_USER_AGENT = "claude-code/1.0.17";
+
+// ============================================================================
+// 类型定义
+// ============================================================================
+
+interface AnthropicUsageResponse {
+  five_hour?: { utilization: number; resets_at: string };
+  seven_day?: { utilization: number; resets_at: string };
+  extra_usage?: unknown;
+}
+
+// ============================================================================
+// Token 刷新
+// ============================================================================
+
+/**
+ * 使用 refresh token 获取新的 access token。
+ * Anthropic 使用 refresh token rotation，每次刷新后旧的 refresh token 失效。
+ * 注意：此处无法将新 token 写回 auth.json，调用方应提示用户重新登录。
+ */
+async function refreshAccessToken(
+  refreshToken: string,
+): Promise<string | null> {
+  try {
+    const params = new URLSearchParams({
+      grant_type: "refresh_token",
+      refresh_token: refreshToken,
+      client_id: CLAUDE_CODE_CLIENT_ID,
+    });
+
+    const response = await fetch(ANTHROPIC_TOKEN_URL, {
+      method: "POST",
+      headers: { "Content-Type": "application/x-www-form-urlencoded" },
+      body: params,
+    });
+
+    if (!response.ok) return null;
+
+    const data = (await response.json()) as { access_token?: string };
+    return data.access_token ?? null;
+  } catch {
+    return null;
+  }
+}
+
+// ============================================================================
+// API 调用
+// ============================================================================
+
+/**
+ * 查询 Anthropic Claude 订阅配额。
+ * 使用 oauth/usage 内部端点（Claude Code HUD 所用的同一端点）。
+ */
+async function fetchAnthropicUsage(
+  accessToken: string,
+): Promise<AnthropicUsageResponse> {
+  const response = await fetchWithTimeout(ANTHROPIC_USAGE_URL, {
+    method: "GET",
+    headers: {
+      Authorization: `Bearer ${accessToken}`,
+      "anthropic-beta": ANTHROPIC_BETA,
+      "User-Agent": ANTHROPIC_USER_AGENT,
+      "Content-Type": "application/json",
+    },
+  });
+
+  if (!response.ok) {
+    const errorText = await response.text();
+    throw new Error(t.anthropicApiError(response.status, errorText));
+  }
+
+  return response.json() as Promise<AnthropicUsageResponse>;
+}
+
+// ============================================================================
+// 格式化输出
+// ============================================================================
+
+/**
+ * 将 ISO 时间戳转换为剩余时间（秒）
+ */
+function secondsUntil(isoTime: string): number {
+  try {
+    return Math.max(0, Math.floor((new Date(isoTime).getTime() - Date.now()) / 1000));
+  } catch {
+    return 0;
+  }
+}
+
+/**
+ * 格式化单个使用窗口（5h / 7d）
+ */
+function formatWindow(
+  label: string,
+  utilization: number,
+  resets_at: string,
+): string[] {
+  const remainPercent = calcRemainPercent(utilization);
+  const progressBar = createProgressBar(remainPercent);
+  const resetSecs = secondsUntil(resets_at);
+  const resetStr = resetSecs > 0 ? formatDuration(resetSecs) : t.resetsSoon;
+
+  return [
+    label,
+    `${progressBar} ${t.remaining(remainPercent)}`,
+    t.resetIn(resetStr),
+  ];
+}
+
+/**
+ * 格式化 Anthropic 使用情况输出
+ */
+function formatAnthropicUsage(data: AnthropicUsageResponse): string {
+  const lines: string[] = [];
+
+  lines.push(`${t.account}        Claude Pro/Max`);
+  lines.push("");
+
+  if (data.five_hour) {
+    lines.push(...formatWindow(t.anthropicFiveHourLimit, data.five_hour.utilization, data.five_hour.resets_at));
+  }
+
+  if (data.seven_day) {
+    if (data.five_hour) lines.push("");
+    lines.push(...formatWindow(t.anthropicSevenDayLimit, data.seven_day.utilization, data.seven_day.resets_at));
+  }
+
+  if (!data.five_hour && !data.seven_day) {
+    lines.push(t.anthropicNoLimits);
+  }
+
+  return lines.join("\n");
+}
+
+// ============================================================================
+// 导出接口
+// ============================================================================
+
+export type { AnthropicAuthData };
+
+/**
+ * 查询 Anthropic Claude 订阅配额
+ * @param authData Anthropic OAuth 认证数据
+ * @returns 查询结果，如果账号不存在或无效返回 null
+ */
+export async function queryAnthropicUsage(
+  authData: AnthropicAuthData | undefined,
+): Promise<QueryResult | null> {
+  if (!authData || authData.type !== "oauth") return null;
+
+  let accessToken = authData.access;
+
+  // 如果 access token 过期或缺失，尝试刷新
+  if (!accessToken || (authData.expires && authData.expires < Date.now())) {
+    if (!authData.refresh) {
+      return { success: false, error: t.anthropicTokenExpired };
+    }
+    const refreshed = await refreshAccessToken(authData.refresh);
+    if (!refreshed) {
+      return { success: false, error: t.anthropicRefreshFailed };
+    }
+    accessToken = refreshed;
+  }
+
+  try {
+    const usage = await fetchAnthropicUsage(accessToken);
+    return {
+      success: true,
+      output: formatAnthropicUsage(usage),
+    };
+  } catch (err) {
+    return {
+      success: false,
+      error: err instanceof Error ? err.message : String(err),
+    };
+  }
+}
diff --git a/plugin/lib/google.ts b/plugin/lib/google.ts
index 18471db..11a2baa 100644
--- a/plugin/lib/google.ts
+++ b/plugin/lib/google.ts
@@ -78,13 +78,11 @@ const MODELS_TO_DISPLAY: ModelConfig[] = [
 ];
 
 // 获取 Antigravity 账号文件路径
+// Note: opencode always stores this file under ~/.config/opencode/ on all
+// platforms, including Windows. Using APPDATA on Windows was incorrect and
+// caused quota lookups to silently fail for Windows users.
 function getAntigravityAccountsPath(): string {
-  const home = homedir();
-  const configDir =
-    process.platform === "win32"
-      ? process.env.APPDATA || join(home, "AppData", "Roaming")
-      : join(home, ".config");
-  return join(configDir, "opencode", "antigravity-accounts.json");
+  return join(homedir(), ".config", "opencode", "antigravity-accounts.json");
 }
 
 const GOOGLE_TOKEN_REFRESH_URL = "https://oauth2.googleapis.com/token";
diff --git a/plugin/lib/i18n.ts b/plugin/lib/i18n.ts
index 2c15d4b..db0d697 100644
--- a/plugin/lib/i18n.ts
+++ b/plugin/lib/i18n.ts
@@ -4,7 +4,7 @@
  * [输入]: 系统语言环境
  * [输出]: 翻译函数和当前语言
  * [定位]: 被所有平台模块共享使用
- * [同步]: openai.ts, zhipu.ts, mystatus.ts, utils.ts
+ * [同步]: openai.ts, zhipu.ts, anthropic.ts, mystatus.ts, utils.ts
  */
 
 // ============================================================================
@@ -71,7 +71,7 @@ const translations = {
     tokenExpired:
       "⚠️ OAuth 授权已过期，请在 OpenCode 中使用一次 OpenAI 模型以刷新授权。",
     noAccounts:
-      "未找到任何已配置的账号。\n\n支持的账号类型:\n- OpenAI (Plus/Team/Pro 订阅用户)\n- 智谱 AI (Coding Plan)\n- Z.ai (Coding Plan)\n- Google Cloud (Antigravity)",
+      "未找到任何已配置的账号。\n\n支持的账号类型:\n- OpenAI (Plus/Team/Pro 订阅用户)\n- Anthropic (Claude Pro/Max)\n- 智谱 AI (Coding Plan)\n- Z.ai (Coding Plan)\n- Google Cloud (Antigravity)",
     queryFailed: "❌ 查询失败的账号:\n",
 
     // 平台标题
@@ -90,6 +90,18 @@ const translations = {
     zaiAccountName: "Z.ai",
     noQuotaData: "暂无配额数据",
 
+    // Anthropic 相关
+    anthropicTitle: "## Anthropic 账号额度",
+    anthropicApiError: (status: number, text: string) =>
+      `Anthropic API 请求失败 (${status}): ${text}`,
+    anthropicTokenExpired:
+      "⚠️ Anthropic OAuth token 已过期且无 refresh token，请在 OpenCode 中重新登录 Anthropic。",
+    anthropicRefreshFailed:
+      "⚠️ Anthropic token 刷新失败，请在 OpenCode 中重新登录 Anthropic。",
+    anthropicFiveHourLimit: "5 小时限额",
+    anthropicSevenDayLimit: "7 天限额",
+    anthropicNoLimits: "(未检测到限额数据 — 可能是 API Key 订阅或无限制计划)",
+
     // Google 相关
     googleTitle: "## Google Cloud 账号额度",
     googleApiError: (status: number, text: string) =>
@@ -149,7 +161,7 @@ const translations = {
     tokenExpired:
       "⚠️ OAuth token expired. Please use an OpenAI model in OpenCode to refresh authorization.",
     noAccounts:
-      "No configured accounts found.\n\nSupported account types:\n- OpenAI (Plus/Team/Pro subscribers)\n- Zhipu AI (Coding Plan)\n- Z.ai (Coding Plan)\n- Google Cloud (Antigravity)",
+      "No configured accounts found.\n\nSupported account types:\n- OpenAI (Plus/Team/Pro subscribers)\n- Anthropic (Claude Pro/Max)\n- Zhipu AI (Coding Plan)\n- Z.ai (Coding Plan)\n- Google Cloud (Antigravity)",
     queryFailed: "❌ Failed to query accounts:\n",
 
     // 平台标题
@@ -168,6 +180,18 @@ const translations = {
     zaiAccountName: "Z.ai",
     noQuotaData: "No quota data available",
 
+    // Anthropic 相关
+    anthropicTitle: "## Anthropic Account Quota",
+    anthropicApiError: (status: number, text: string) =>
+      `Anthropic API request failed (${status}): ${text}`,
+    anthropicTokenExpired:
+      "⚠️ Anthropic OAuth token expired and no refresh token available. Re-authenticate Anthropic in OpenCode.",
+    anthropicRefreshFailed:
+      "⚠️ Anthropic token refresh failed. Re-authenticate Anthropic in OpenCode.",
+    anthropicFiveHourLimit: "5-hour limit",
+    anthropicSevenDayLimit: "7-day limit",
+    anthropicNoLimits: "(No rolling-window limits found — may be API key plan or unlimited)",
+
     // Google 相关
     googleTitle: "## Google Cloud Account Quota",
     googleApiError: (status: number, text: string) =>
diff --git a/plugin/lib/types.ts b/plugin/lib/types.ts
index 01543f8..15d8628 100644
--- a/plugin/lib/types.ts
+++ b/plugin/lib/types.ts
@@ -2,7 +2,7 @@
  * 共享类型定义
  *
  * [定位]: 被所有平台模块共享使用的类型
- * [同步]: openai.ts, zhipu.ts, google.ts, mystatus.ts
+ * [同步]: openai.ts, zhipu.ts, google.ts, anthropic.ts, mystatus.ts
  */
 
 // ============================================================================
@@ -32,6 +32,17 @@ export interface OpenAIAuthData {
   expires?: number;
 }
 
+/**
+ * Anthropic Claude OAuth 认证数据
+ * 对应 auth.json 中的 "anthropic" 键
+ */
+export interface AnthropicAuthData {
+  type: string;
+  access?: string;
+  refresh?: string;
+  expires?: number;
+}
+
 /**
  * 智谱 AI API 认证数据
  */
@@ -98,6 +109,7 @@ export interface AntigravityAccountsFile {
  */
 export interface AuthData {
   openai?: OpenAIAuthData;
+  anthropic?: AnthropicAuthData;
   "zhipuai-coding-plan"?: ZhipuAuthData;
   "zai-coding-plan"?: ZhipuAuthData;
   "github-copilot"?: CopilotAuthData;
diff --git a/plugin/mystatus.ts b/plugin/mystatus.ts
index 00eddee..0f93858 100644
--- a/plugin/mystatus.ts
+++ b/plugin/mystatus.ts
@@ -4,7 +4,7 @@
  * [输入]: ~/.local/share/opencode/auth.json 和 ~/.config/opencode/antigravity-accounts.json 中的认证信息
  * [输出]: 带进度条的额度使用情况展示
  * [定位]: 通过 mystatus 工具查询各账号额度
- * [同步]: lib/openai.ts, lib/zhipu.ts, lib/google.ts, lib/types.ts, lib/i18n.ts
+ * [同步]: lib/openai.ts, lib/zhipu.ts, lib/google.ts, lib/anthropic.ts, lib/types.ts, lib/i18n.ts
  */
 
 import { type Plugin, tool } from "@opencode-ai/plugin";
@@ -17,6 +17,7 @@ import { type AuthData, type QueryResult } from "./lib/types";
 import { queryOpenAIUsage } from "./lib/openai";
 import { queryZaiUsage, queryZhipuUsage } from "./lib/zhipu";
 import { queryGoogleUsage } from "./lib/google";
+import { queryAnthropicUsage } from "./lib/anthropic";
 import { queryCopilotUsage } from "./lib/copilot";
 
 // ============================================================================
@@ -28,7 +29,7 @@ export const MyStatusPlugin: Plugin = async () => {
     tool: {
       mystatus: tool({
         description:
-          "Query account quota usage for all configured AI platforms. Returns remaining quota percentages, usage stats, and reset countdowns with visual progress bars. Currently supports OpenAI (ChatGPT/Codex), Zhipu AI, Z.ai, Google Antigravity, and GitHub Copilot.",
+          "Query account quota usage for all configured AI platforms. Returns remaining quota percentages, usage stats, and reset countdowns with visual progress bars. Currently supports OpenAI (ChatGPT/Codex), Anthropic (Claude Pro/Max), Zhipu AI, Z.ai, Google Antigravity, and GitHub Copilot.",
         args: {},
         async execute() {
           // 1. 读取 auth.json
@@ -46,9 +47,10 @@ export const MyStatusPlugin: Plugin = async () => {
           }
 
           // 2. 并行查询所有平台（Google 不依赖 authData）
-          const [openaiResult, zhipuResult, zaiResult, googleResult, copilotResult] =
+          const [openaiResult, anthropicResult, zhipuResult, zaiResult, googleResult, copilotResult] =
             await Promise.all([
               queryOpenAIUsage(authData.openai),
+              queryAnthropicUsage(authData.anthropic),
               queryZhipuUsage(authData["zhipuai-coding-plan"]),
               queryZaiUsage(authData["zai-coding-plan"]),
               queryGoogleUsage(),
@@ -62,6 +64,9 @@ export const MyStatusPlugin: Plugin = async () => {
           // 处理 OpenAI 结果
           collectResult(openaiResult, t.openaiTitle, results, errors);
 
+          // 处理 Anthropic 结果
+          collectResult(anthropicResult, t.anthropicTitle, results, errors);
+
           // 处理智谱结果
           collectResult(zhipuResult, t.zhipuTitle, results, errors);