xiaohongshu
xiaohongshu
mcp
Model Context Protocol (MCP) サーバーの作成・管理ガイド。カスタムツールの追加方法。 使用タイミング: (1) Claude Codeにカスタムツールを追加したい時 (2) 外部サービス連携時 (3) プロジェクト固有の自動化ツールを作りたい時 (4) MCPサーバーの設定方法を知りたい時。 トリガー例: 「MCPサーバーを作って」「カスタムツールを追加」「MCP設定」 「外部APIをツール化」「テストランナーMCP」
Full skill instructions
Model Context Protocol (MCP) サーバーの作成・管理。
MCP は Claude Code にカスタムツールを追加するためのプロトコル。
用途:
// scripts/mcp/my-tool.js
import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
const server = new Server(
{ name: "my-tool", version: "1.0.0" },
{ capabilities: { tools: {} } }
);
// ツール一覧
server.setRequestHandler("tools/list", async () => ({
tools: [
{
name: "my_custom_tool",
description: "カスタムツールの説明",
inputSchema: {
type: "object",
properties: {
param1: { type: "string", description: "パラメータ1" },
},
required: ["param1"],
},
},
],
}));
// ツール実行
server.setRequestHandler("tools/call", async (request) => {
const { name, arguments: args } = request.params;
if (name === "my_custom_tool") {
const result = await doSomething(args.param1);
return { content: [{ type: "text", text: JSON.stringify(result) }] };
}
throw new Error(`Unknown tool: ${name}`);
});
// サーバー起動
const transport = new StdioServerTransport();
await server.connect(transport);
{
"mcpServers": {
"my-tool": {
"command": "node",
"args": ["scripts/mcp/my-tool.js"]
}
}
}
{
"mcpServers": {
"my-global-tool": {
"command": "node",
"args": ["/path/to/tool.js"]
}
}
}
server.setRequestHandler("tools/list", async () => ({
tools: [
{
name: "run_tests",
description: "ユニットテストを実行",
inputSchema: {
type: "object",
properties: {
pattern: { type: "string", description: "テストパターン" },
},
},
},
],
}));
server.setRequestHandler("tools/call", async (request) => {
if (request.params.name === "run_tests") {
const pattern = request.params.arguments?.pattern || "";
const result = await runTests(pattern);
return { content: [{ type: "text", text: result }] };
}
});
async function runTests(pattern) {
const { execSync } = await import("child_process");
try {
const output = execSync(`npm test -- ${pattern}`, { encoding: "utf-8" });
return output;
} catch (error) {
return error.stdout + error.stderr;
}
}
{
name: "query_database",
description: "データベースにクエリを実行",
inputSchema: {
type: "object",
properties: {
query: { type: "string", description: "SQL クエリ" },
},
required: ["query"],
},
}
使わないMCPサーバーを無効化してコンテキストを節約:
// .mcp.json
{
"mcpServers": {
"frequently-used": { "command": "node", "args": ["tool1.js"] }
},
"disabledMcpServers": [
"rarely-used-tool",
"heavy-context-tool"
]
}
# 直接実行
node scripts/mcp/my-tool.js
# ログ確認
DEBUG=mcp* node scripts/mcp/my-tool.js
# Claude Code で確認
# /mcp コマンドで接続状態を確認
xiaohongshu
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