npm install @anthropic-ai/claude-agent-sdk

import binPath from "@anthropic-ai/claude-agent-sdk-darwin-arm64/claude" with { type: "file" };
import { extractFromBunfs } from "@anthropic-ai/claude-agent-sdk/extract";
import { query } from "@anthropic-ai/claude-agent-sdk";

const cliPath = extractFromBunfs(binPath);

for await (const message of query({
  prompt: "Hello",
  options: { pathToClaudeCodeExecutable: cliPath },
})) {
  console.log(message);
}

function query({
  prompt,
  options
}: {
  prompt: string | AsyncIterable<SDKUserMessage>;
  options?: Options;
}): Query;

function startup(params?: {
  options?: Options;
  initializeTimeoutMs?: number;
}): Promise<WarmQuery>;

import { startup } from "@anthropic-ai/claude-agent-sdk";

// 提前支付启动成本
const warm = await startup({ options: { maxTurns: 3 } });

// 稍后，当提示词准备好时，这是即时的
for await (const message of warm.query("What files are here?")) {
  console.log(message);
}

function tool<Schema extends AnyZodRawShape>(
  name: string,
  description: string,
  inputSchema: Schema,
  handler: (args: InferShape<Schema>, extra: unknown) => Promise<CallToolResult>,
  extras?: { annotations?: ToolAnnotations; searchHint?: string; alwaysLoad?: boolean }
): SdkMcpToolDefinition<Schema>;

import { tool } from "@anthropic-ai/claude-agent-sdk";
import { z } from "zod";

const searchTool = tool(
  "search",
  "Search the web",
  { query: z.string() },
  async ({ query }) => {
    return { content: [{ type: "text", text: `Results for: ${query}` }] };
  },
  { annotations: { readOnlyHint: true, openWorldHint: true } }
);

function createSdkMcpServer(options: {
  name: string;
  version?: string;
  instructions?: string;
  tools?: Array<SdkMcpToolDefinition<any>>;
  alwaysLoad?: boolean;
}): McpSdkServerConfigWithInstance;

function listSessions(options?: ListSessionsOptions): Promise<SDKSessionInfo[]>;

import { listSessions } from "@anthropic-ai/claude-agent-sdk";

const sessions = await listSessions({ dir: "/path/to/project", limit: 10 });

for (const session of sessions) {
  console.log(`${session.summary} (${session.sessionId})`);
}

function getSessionMessages(
  sessionId: string,
  options?: GetSessionMessagesOptions
): Promise<SessionMessage[]>;

import { listSessions, getSessionMessages } from "@anthropic-ai/claude-agent-sdk";

const [latest] = await listSessions({ dir: "/path/to/project", limit: 1 });

if (latest) {
  const messages = await getSessionMessages(latest.sessionId, {
    dir: "/path/to/project",
    limit: 20
  });

  for (const msg of messages) {
    console.log(`[${msg.type}] ${msg.uuid}`);
  }
}

function getSessionInfo(
  sessionId: string,
  options?: GetSessionInfoOptions
): Promise<SDKSessionInfo | undefined>;

function renameSession(
  sessionId: string,
  title: string,
  options?: SessionMutationOptions
): Promise<void>;

function tagSession(
  sessionId: string,
  tag: string | null,
  options?: SessionMutationOptions
): Promise<void>;

function resolveSettings(
  options?: ResolveSettingsOptions
): Promise<ResolvedSettings>;

import { resolveSettings } from "@anthropic-ai/claude-agent-sdk";

const { effective, provenance } = await resolveSettings({
  cwd: "/path/to/project",
  settingSources: ["user", "project", "local"],
});

console.log(`Cleanup period: ${effective.cleanupPeriodDays} days`);
console.log(`Set by: ${provenance.cleanupPeriodDays?.source}`);

import { query } from "@anthropic-ai/claude-agent-sdk";

const result = query({
  prompt: "Analyze this code",
  options: {
    env: {
      ...process.env,
      API_TIMEOUT_MS: "120000",
      CLAUDE_CODE_MAX_RETRIES: "2",
      CLAUDE_ASYNC_AGENT_STALL_TIMEOUT_MS: "120000",
    },
  },
});

interface Query extends AsyncGenerator<SDKMessage, void> {
  interrupt(): Promise<SDKControlInterruptResponse | undefined>;
  rewindFiles(
    userMessageId: string,
    options?: { dryRun?: boolean }
  ): Promise<RewindFilesResult>;
  setPermissionMode(mode: PermissionMode): Promise<void>;
  setModel(model?: string): Promise<void>;
  setMaxThinkingTokens(maxThinkingTokens: number | null): Promise<void>;
  applyFlagSettings(settings: { [K in keyof Settings]?: Settings[K] | null }): Promise<void>;
  initializationResult(): Promise<SDKControlInitializeResponse>;
  reinitialize(): Promise<SDKControlInitializeResponse>;
  supportedCommands(): Promise<SlashCommand[]>;
  supportedModels(): Promise<ModelInfo[]>;
  supportedAgents(): Promise<AgentInfo[]>;
  mcpServerStatus(): Promise<McpServerStatus[]>;
  getContextUsage(): Promise<SDKControlGetContextUsageResponse>;
  accountInfo(): Promise<AccountInfo>;
  reconnectMcpServer(serverName: string): Promise<void>;
  toggleMcpServer(serverName: string, enabled: boolean): Promise<void>;
  setMcpServers(servers: Record<string, McpServerConfig>): Promise<McpSetServersResult>;
  streamInput(stream: AsyncIterable<SDKUserMessage>): Promise<void>;
  stopTask(taskId: string): Promise<void>;
  close(): void;
}

import { query } from "@anthropic-ai/claude-agent-sdk";

const q = query({ prompt: messageStream });

// 为会话余下部分覆盖模型
await q.applyFlagSettings({ model: "claude-opus-4-6" });

// 稍后：清除覆盖，回退到更低优先级的设置
await q.applyFlagSettings({ model: null });

interface WarmQuery extends AsyncDisposable {
  query(prompt: string | AsyncIterable<SDKUserMessage>): Query;
  close(): void;
}

type SDKControlInitializeResponse = {
  commands: SlashCommand[];
  agents: AgentInfo[];
  output_style: string;
  available_output_styles: string[];
  models: ModelInfo[];
  account: AccountInfo;
  fast_mode_state?: "off" | "cooldown" | "on";
  fast_mode_disabled_reason?: FastModeDisabledReason;
};

type SDKControlInterruptResponse = {
  still_queued: string[];
  cancelled?: string[];
};

type SDKControlGetContextUsageResponse = {
  categories: {
    name: string;
    tokens: number;
    color: string;
    isDeferred?: boolean;
  }[];
  totalTokens: number;
  maxTokens: number;
  rawMaxTokens: number;
  percentage: number;
  gridRows: {
    color: string;
    isFilled: boolean;
    categoryName: string;
    tokens: number;
    percentage: number;
    squareFullness: number;
  }[][];
  model: string;
  memoryFiles: {
    path: string;
    type: string;
    tokens: number;
  }[];
  mcpTools: {
    name: string;
    serverName: string;
    tokens: number;
    isLoaded?: boolean;
  }[];
  deferredBuiltinTools?: {
    name: string;
    tokens: number;
    isLoaded: boolean;
  }[];
  systemTools?: {
    name: string;
    tokens: number;
  }[];
  systemPromptSections?: {
    name: string;
    tokens: number;
  }[];
  agents: {
    agentType: string;
    source: string;
    tokens: number;
  }[];
  slashCommands?: {
    totalCommands: number;
    includedCommands: number;
    tokens: number;
  };
  skills?: {
    totalSkills: number;
    includedSkills: number;
    tokens: number;
    skillFrontmatter: {
      name: string;
      source: string;
      tokens: number;
    }[];
  };
  autoCompactThreshold?: number;
  isAutoCompactEnabled: boolean;
  messageBreakdown?: {
    toolCallTokens: number;
    toolResultTokens: number;
    attachmentTokens: number;
    assistantMessageTokens: number;
    userMessageTokens: number;
    redirectedContextTokens: number;
    unattributedTokens: number;
    toolCallsByType: {
      name: string;
      callTokens: number;
      resultTokens: number;
    }[];
    attachmentsByType: {
      name: string;
      tokens: number;
    }[];
  };
  apiUsage: {
    input_tokens: number;
    output_tokens: number;
    cache_creation_input_tokens: number;
    cache_read_input_tokens: number;
  } | null;
};

type AgentDefinition = {
  description: string;
  tools?: string[];
  disallowedTools?: string[];
  prompt: string;
  model?: string;
  mcpServers?: AgentMcpServerSpec[];
  skills?: string[];
  initialPrompt?: string;
  maxTurns?: number;
  background?: boolean;
  memory?: "user" | "project" | "local";
  effort?: "low" | "medium" | "high" | "xhigh" | "max" | number;
  permissionMode?: PermissionMode;
  criticalSystemReminder_EXPERIMENTAL?: string;
};

type AgentMcpServerSpec = string | Record<string, McpServerConfigForProcessTransport>;

type SettingSource = "user" | "project" | "local";

import { query } from "@anthropic-ai/claude-agent-sdk";

// 不从磁盘加载 user、project 或 local 设置
const result = query({
  prompt: "Analyze this code",
  options: { settingSources: [] }
});

import { query } from "@anthropic-ai/claude-agent-sdk";

const result = query({
  prompt: "Analyze this code",
  options: {
    settingSources: ["user", "project", "local"] // 加载所有设置
  }
});

import { query } from "@anthropic-ai/claude-agent-sdk";

// 仅加载项目设置，忽略 user 和 local
const result = query({
  prompt: "Run CI checks",
  options: {
    settingSources: ["project"] // 仅 .claude/settings.json
  }
});

import { query } from "@anthropic-ai/claude-agent-sdk";

// 通过排除 local 设置确保 CI 中行为一致
const result = query({
  prompt: "Run tests",
  options: {
    settingSources: ["project"], // 仅团队共享设置
    permissionMode: "bypassPermissions",
    allowDangerouslySkipPermissions: true
  }
});

import { query } from "@anthropic-ai/claude-agent-sdk";

// 完全以编程方式定义。
// 传 [] 退出文件系统设置源。
const result = query({
  prompt: "Review this PR",
  options: {
    settingSources: [],
    agents: {
      /* ... */
    },
    mcpServers: {
      /* ... */
    },
    allowedTools: ["Read", "Grep", "Glob"]
  }
});

import { query } from "@anthropic-ai/claude-agent-sdk";

// 加载项目设置以包含 CLAUDE.md 文件
const result = query({
  prompt: "Add a new feature following project conventions",
  options: {
    systemPrompt: {
      type: "preset",
      preset: "claude_code" // 使用 Claude Code 的系统提示
    },
    settingSources: ["project"], // 从项目目录加载 CLAUDE.md
    allowedTools: ["Read", "Write", "Edit"]
  }
});

type PermissionMode =
  | "default" // 标准权限行为
  | "acceptEdits" // 自动接受文件编辑
  | "bypassPermissions" // 跳过权限检查；显式 ask 规则仍会提示
  | "plan" // 计划模式 - 探索但不编辑
  | "dontAsk" // 不提示权限，未预先批准则拒绝
  | "auto"; // 模型分类器批准或拒绝权限提示

type CanUseTool = (
  toolName: string,
  input: Record<string, unknown>,
  options: {
    signal: AbortSignal;
    suggestions?: PermissionUpdate[];
    blockedPath?: string;
    decisionReason?: string;
    toolUseID: string;
    agentID?: string;
    requestId: string;
  }
) => Promise<PermissionResult | null>;

type PermissionResult =
  | {
      behavior: "allow";
      updatedInput?: Record<string, unknown>;
      updatedPermissions?: PermissionUpdate[];
      toolUseID?: string;
    }
  | {
      behavior: "deny";
      message: string;
      interrupt?: boolean;
      toolUseID?: string;
    };

type ToolConfig = {
  askUserQuestion?: {
    previewFormat?: "markdown" | "html";
  };
};

type McpServerConfig =
  | McpStdioServerConfig
  | McpSSEServerConfig
  | McpHttpServerConfig
  | McpSdkServerConfigWithInstance;

type McpStdioServerConfig = {
  type?: "stdio";
  command: string;
  args?: string[];
  env?: Record<string, string>;
};

type McpSSEServerConfig = {
  type: "sse";
  url: string;
  headers?: Record<string, string>;
};

type McpHttpServerConfig = {
  type: "http";
  url: string;
  headers?: Record<string, string>;
};

type McpSdkServerConfigWithInstance = {
  type: "sdk";
  name: string;
  instance: McpServer;
};

type McpClaudeAIProxyServerConfig = {
  type: "claudeai-proxy";
  url: string;
  id: string;
};

type SdkPluginConfig = {
  type: "local";
  path: string;
  skipMcpDiscovery?: boolean;
};

plugins: [
  { type: "local", path: "./my-plugin" },
  { type: "local", path: "/absolute/path/to/plugin" }
];

type SDKMessage =
  | SDKAssistantMessage
  | SDKUserMessage
  | SDKUserMessageReplay
  | SDKResultMessage
  | SDKSystemMessage
  | SDKPartialAssistantMessage
  | SDKCompactBoundaryMessage
  | SDKStatusMessage
  | SDKLocalCommandOutputMessage
  | SDKHookStartedMessage
  | SDKHookProgressMessage
  | SDKHookResponseMessage
  | SDKPluginInstallMessage
  | SDKToolProgressMessage
  | SDKAuthStatusMessage
  | SDKTaskNotificationMessage
  | SDKTaskStartedMessage
  | SDKTaskProgressMessage
  | SDKTaskUpdatedMessage
  | SDKBackgroundTasksChangedMessage
  | SDKThinkingTokensMessage
  | SDKSessionStateChangedMessage
  | SDKWorkerShuttingDownMessage
  | SDKCommandsChangedMessage
  | SDKNotificationMessage
  | SDKFilesPersistedEvent
  | SDKToolUseSummaryMessage
  | SDKMemoryRecallMessage
  | SDKRateLimitEvent
  | SDKElicitationCompleteMessage
  | SDKPermissionDeniedMessage
  | SDKPromptSuggestionMessage
  | SDKAPIRetryMessage
  | SDKMirrorErrorMessage
  | SDKInformationalMessage
  | SDKConversationResetMessage;

type SDKAssistantMessage = {
  type: "assistant";
  uuid: UUID;
  session_id: string;
  message: BetaMessage; // 来自 Anthropic SDK
  parent_tool_use_id: string | null;
  error?: SDKAssistantMessageError;
  aborted?: true;
  timestamp?: string;
};

type SDKUserMessage = {
  type: "user";
  uuid?: UUID;
  session_id?: string;
  message: MessageParam; // 来自 Anthropic SDK
  parent_tool_use_id: string | null;
  isSynthetic?: boolean;
  shouldQuery?: boolean;
  tool_use_result?: unknown;
  origin?: SDKMessageOrigin;
};

type SDKUserMessageReplay = {
  type: "user";
  uuid: UUID;
  session_id: string;
  message: MessageParam;
  parent_tool_use_id: string | null;
  isSynthetic?: boolean;
  tool_use_result?: unknown;
  origin?: SDKMessageOrigin;
  isReplay: true;
};

type SDKResultMessage =
  | {
      type: "result";
      subtype: "success";
      uuid: UUID;
      session_id: string;
      duration_ms: number;
      duration_api_ms: number;
      is_error: boolean;
      api_error_status?: number | null;
      num_turns: number;
      result: string;
      stop_reason: string | null;
      ttft_ms?: number;
      ttft_stream_ms?: number;
      user_message_uuid?: string;
      request_sent_wall_ms?: number;
      total_cost_usd: number;
      usage: NonNullableUsage;
      modelUsage: { [modelName: string]: ModelUsage };
      permission_denials: SDKPermissionDenial[];
      structured_output?: unknown;
      deferred_tool_use?: { id: string; name: string; input: Record<string, unknown> };
      terminal_reason?: TerminalReason;
      fast_mode_state?: FastModeState;
      fast_mode_disabled_reason?: FastModeDisabledReason;
      origin?: SDKMessageOrigin;
    }
  | {
      type: "result";
      subtype:
        | "error_max_turns"
        | "error_during_execution"
        | "error_max_budget_usd"
        | "error_max_structured_output_retries";
      uuid: UUID;
      session_id: string;
      duration_ms: number;
      duration_api_ms: number;
      is_error: boolean;
      num_turns: number;
      stop_reason: string | null;
      total_cost_usd: number;
      usage: NonNullableUsage;
      modelUsage: { [modelName: string]: ModelUsage };
      permission_denials: SDKPermissionDenial[];
      errors: string[];
      terminal_reason?: TerminalReason;
      fast_mode_state?: FastModeState;
      fast_mode_disabled_reason?: FastModeDisabledReason;
      origin?: SDKMessageOrigin;
    };

type SDKSystemMessage = {
  type: "system";
  subtype: "init";
  uuid: UUID;
  session_id: string;
  agents?: string[];
  apiKeySource: ApiKeySource;
  betas?: string[];
  claude_code_version: string;
  cwd: string;
  tools: string[];
  mcp_servers: {
    name: string;
    status: string;
  }[];
  model: string;
  permissionMode: PermissionMode;
  slash_commands: string[];
  output_style: string;
  skills: string[];
  plugins: { name: string; path: string }[];
  fast_mode_state?: FastModeState;
  fast_mode_disabled_reason?: FastModeDisabledReason;
  capabilities?: string[];
};

type SDKPartialAssistantMessage = {
  type: "stream_event";
  event: BetaRawMessageStreamEvent; // 来自 Anthropic SDK
  parent_tool_use_id: string | null;
  uuid: UUID;
  session_id: string;
  ttft_ms?: number; // 首 token 时间（毫秒），仅在 message_start 事件上存在
};

type SDKCompactBoundaryMessage = {
  type: "system";
  subtype: "compact_boundary";
  uuid: UUID;
  session_id: string;
  compact_metadata: {
    trigger: "manual" | "auto";
    pre_tokens: number;
  };
};

type SDKInformationalMessage = {
  type: "system";
  subtype: "informational";
  content: string;
  level: "info" | "notice" | "suggestion" | "warning";
  tool_use_id?: string;
  prevent_continuation?: boolean;
  uuid: UUID;
  session_id: string;
};

type SDKWorkerShuttingDownMessage = {
  type: "system";
  subtype: "worker_shutting_down";
  reason: string;
  uuid: UUID;
  session_id: string;
};

type SDKPluginInstallMessage = {
  type: "system";
  subtype: "plugin_install";
  status: "started" | "installed" | "failed" | "completed";
  name?: string;
  error?: string;
  uuid: UUID;
  session_id: string;
};

type SDKPermissionDeniedMessage = {
  type: "system";
  subtype: "permission_denied";
  tool_name: string;
  tool_use_id: string;
  agent_id?: string;
  decision_reason_type?: string;
  decision_reason?: string;
  message: string;
  uuid: UUID;
  session_id: string;
};

type SDKPermissionDenial = {
  tool_name: string;
  tool_use_id: string;
  tool_input: Record<string, unknown>;
};

type SDKMessageOrigin =
  | { kind: "human" }
  | { kind: "channel"; server: string }
  | {
      kind: "peer";
      from: string;
      name?: string;
      fromSession?: string;
      senderTaskId?: string;
      body?: string;
      verifiedPeerPid?: number;
    }
  | { kind: "task-notification" }
  | { kind: "coordinator" }
  | { kind: "auto-continuation" };

type HookEvent =
  | "PreToolUse"
  | "PostToolUse"
  | "PostToolUseFailure"
  | "PostToolBatch"
  | "Notification"
  | "UserPromptSubmit"
  | "UserPromptExpansion"
  | "SessionStart"
  | "SessionEnd"
  | "Stop"
  | "StopFailure"
  | "SubagentStart"
  | "SubagentStop"
  | "PreCompact"
  | "PostCompact"
  | "PermissionRequest"
  | "PermissionDenied"
  | "Setup"
  | "TeammateIdle"
  | "TaskCreated"
  | "TaskCompleted"
  | "Elicitation"
  | "ElicitationResult"
  | "ConfigChange"
  | "DirectoryAdded"
  | "WorktreeCreate"
  | "WorktreeRemove"
  | "InstructionsLoaded"
  | "CwdChanged"
  | "FileChanged"
  | "MessageDisplay";

type HookCallback = (
  input: HookInput, // 所有 hook 输入类型的联合
  toolUseID: string | undefined,
  options: { signal: AbortSignal }
) => Promise<HookJSONOutput>;

interface HookCallbackMatcher {
  matcher?: string;
  hooks: HookCallback[];
  timeout?: number; // 此 matcher 中所有 hook 的超时时间（秒）
}

type HookInput =
  | PreToolUseHookInput
  | PostToolUseHookInput
  | PostToolUseFailureHookInput
  | PostToolBatchHookInput
  | PermissionDeniedHookInput
  | NotificationHookInput
  | UserPromptSubmitHookInput
  | UserPromptExpansionHookInput
  | SessionStartHookInput
  | SessionEndHookInput
  | StopHookInput
  | StopFailureHookInput
  | SubagentStartHookInput
  | SubagentStopHookInput
  | PreCompactHookInput
  | PostCompactHookInput
  | PermissionRequestHookInput
  | SetupHookInput
  | TeammateIdleHookInput
  | TaskCreatedHookInput
  | TaskCompletedHookInput
  | ElicitationHookInput
  | ElicitationResultHookInput
  | ConfigChangeHookInput
  | InstructionsLoadedHookInput
  | DirectoryAddedHookInput
  | WorktreeCreateHookInput
  | WorktreeRemoveHookInput
  | CwdChangedHookInput
  | FileChangedHookInput
  | MessageDisplayHookInput;

type BaseHookInput = {
  session_id: string;
  transcript_path: string;
  cwd: string;
  prompt_id?: string;
  permission_mode?: string;
  effort?: { level: string };
  agent_id?: string;
  agent_type?: string;
};

type PreToolUseHookInput = BaseHookInput & {
  hook_event_name: "PreToolUse";
  tool_name: string;
  tool_input: unknown;
  tool_use_id: string;
};

type PostToolUseHookInput = BaseHookInput & {
  hook_event_name: "PostToolUse";
  tool_name: string;
  tool_input: unknown;
  tool_response: unknown;
  tool_use_id: string;
  duration_ms?: number;
};

type PostToolUseFailureHookInput = BaseHookInput & {
  hook_event_name: "PostToolUseFailure";
  tool_name: string;
  tool_input: unknown;
  tool_use_id: string;
  error: string;
  is_interrupt?: boolean;
  duration_ms?: number;
};

type PostToolBatchHookInput = BaseHookInput & {
  hook_event_name: "PostToolBatch";
  tool_calls: PostToolBatchToolCall[];
};

type PostToolBatchToolCall = {
  tool_name: string;
  tool_input: unknown;
  tool_use_id: string;
  tool_response?: unknown;
};

type PermissionDeniedHookInput = BaseHookInput & {
  hook_event_name: "PermissionDenied";
  tool_name: string;
  tool_input: unknown;
  tool_use_id: string;
  reason: string;
};

type NotificationHookInput = BaseHookInput & {
  hook_event_name: "Notification";
  message: string;
  title?: string;
  notification_type: string;
};

type UserPromptSubmitHookInput = BaseHookInput & {
  hook_event_name: "UserPromptSubmit";
  prompt: string;
  session_title?: string;
};

type UserPromptExpansionHookInput = BaseHookInput & {
  hook_event_name: "UserPromptExpansion";
  expansion_type: "slash_command" | "mcp_prompt";
  command_name: string;
  command_args: string;
  command_source?: string;
  prompt: string;
};

type SessionStartHookInput = BaseHookInput & {
  hook_event_name: "SessionStart";
  source: "startup" | "resume" | "clear" | "compact" | "fork";
  agent_type?: string;
  model?: string;
  session_title?: string;
};

type SessionEndHookInput = BaseHookInput & {
  hook_event_name: "SessionEnd";
  reason: ExitReason; // EXIT_REASONS 数组中的字符串
};

type StopHookInput = BaseHookInput & {
  hook_event_name: "Stop";
  stop_hook_active: boolean;
  last_assistant_message?: string;
  background_tasks?: BackgroundTaskSummary[];
  session_crons?: SessionCronSummary[];
};

type StopFailureHookInput = BaseHookInput & {
  hook_event_name: "StopFailure";
  error: SDKAssistantMessageError;
  error_details?: string;
  last_assistant_message?: string;
};

type SubagentStartHookInput = BaseHookInput & {
  hook_event_name: "SubagentStart";
  agent_id: string;
  agent_type: string;
};