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模型上下文協議 (MCP) 伺服器透過自訂工具和功能擴展 Claude Code。MCP 可以作為外部程序運行、透過 HTTP/SSE 連接,或直接在您的 SDK 應用程式中執行。
在專案根目錄的 .mcp.json 中配置 MCP 伺服器:
{
"mcpServers": {
"filesystem": {
"command": "npx",
"args": ["@modelcontextprotocol/server-filesystem"],
"env": {
"ALLOWED_PATHS": "/Users/me/projects"
}
}
}
}import { query } from "@anthropic-ai/claude-agent-sdk";
for await (const message of query({
prompt: "List files in my project",
options: {
mcpServers: {
"filesystem": {
command: "npx",
args: ["@modelcontextprotocol/server-filesystem"],
env: {
ALLOWED_PATHS: "/Users/me/projects"
}
}
},
allowedTools: ["mcp__filesystem__list_files"]
}
})) {
if (message.type === "result" && message.subtype === "success") {
console.log(message.result);
}
}透過 stdin/stdout 通訊的外部程序:
// .mcp.json configuration
{
"mcpServers": {
"my-tool": {
"command": "node",
"args": ["./my-mcp-server.js"],
"env": {
"DEBUG": "${DEBUG:-false}"
}
}
}
}具有網路通訊的遠端伺服器:
// SSE server configuration
{
"mcpServers": {
"remote-api": {
"type": "sse",
"url": "https://api.example.com/mcp/sse",
"headers": {
"Authorization": "Bearer ${API_TOKEN}"
}
}
}
}
// HTTP server configuration
{
"mcpServers": {
"http-service": {
"type": "http",
"url": "https://api.example.com/mcp",
"headers": {
"X-API-Key": "${API_KEY}"
}
}
}
}在您的應用程式中運行的程序內伺服器。有關建立自訂工具的詳細資訊,請參閱自訂工具指南:
MCP 伺服器可以公開 Claude 可以列出和讀取的資源:
import { query } from "@anthropic-ai/claude-agent-sdk";
// List available resources
for await (const message of query({
prompt: "What resources are available from the database server?",
options: {
mcpServers: {
"database": {
command: "npx",
args: ["@modelcontextprotocol/server-database"]
}
},
allowedTools: ["mcp__list_resources", "mcp__read_resource"]
}
})) {
if (message.type === "result") console.log(message.result);
}// .mcp.json with environment variables
{
"mcpServers": {
"secure-api": {
"type": "sse",
"url": "https://api.example.com/mcp",
"headers": {
"Authorization": "Bearer ${API_TOKEN}",
"X-API-Key": "${API_KEY:-default-key}"
}
}
}
}
// Set environment variables
process.env.API_TOKEN = "your-token";
process.env.API_KEY = "your-key";目前不支援客戶端內的 OAuth2 MCP 身份驗證。
優雅地處理 MCP 連接失敗:
import { query } from "@anthropic-ai/claude-agent-sdk";
for await (const message of query({
prompt: "Process data",
options: {
mcpServers: {
"data-processor": dataServer
}
}
})) {
if (message.type === "system" && message.subtype === "init") {
// Check MCP server status
const failedServers = message.mcp_servers.filter(
s => s.status !== "connected"
);
if (failedServers.length > 0) {
console.warn("Failed to connect:", failedServers);
}
}
if (message.type === "result" && message.subtype === "error_during_execution") {
console.error("Execution failed");
}
}