Antigravity × MCP エコシステム 2026 完全活用ガイド — サーバー選定・統合・カスタム開発の実践

{
  "github": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-github"],
    "env": { "GITHUB_PERSONAL_ACCESS_TOKEN": "YOUR_GITHUB_TOKEN" }
  }
}

{
  "gitlab": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-gitlab"],
    "env": {
      "GITLAB_PERSONAL_ACCESS_TOKEN": "YOUR_GITLAB_TOKEN",
      "GITLAB_API_URL": "https://gitlab.com"
    }
  }
}

{
  "postgres": {
    "command": "npx",
    "args": [
      "-y", "@modelcontextprotocol/server-postgres",
      "postgresql://user:pass@localhost/mydb"
    ]
  }
}

{
  "sqlite": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-sqlite", "--db-path", "./data.db"]
  }
}

{
  "slack": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-slack"],
    "env": {
      "SLACK_BOT_TOKEN": "xoxb-YOUR_SLACK_BOT_TOKEN",
      "SLACK_TEAM_ID": "T_YOUR_TEAM_ID"
    }
  }
}

{
  "notion": {
    "command": "npx",
    "args": ["-y", "@notionhq/client-mcp"],
    "env": { "NOTION_API_KEY": "YOUR_NOTION_KEY" }
  }
}

{
  "puppeteer": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-puppeteer"]
  }
}

{
  "brave-search": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-brave-search"],
    "env": { "BRAVE_API_KEY": "YOUR_BRAVE_API_KEY" }
  }
}

// my-custom-mcp-server/src/index.ts
import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import {
  CallToolRequestSchema,
  ListToolsRequestSchema,
} from "@modelcontextprotocol/sdk/types.js";
 
const server = new Server(
  { name: "my-company-api", version: "1.0.0" },
  { capabilities: { tools: {} } }
);
 
// ツール一覧の定義
server.setRequestHandler(ListToolsRequestSchema, async () => ({
  tools: [
    {
      name: "get_product_inventory",
      description: "商品の在庫数を取得します",
      inputSchema: {
        type: "object",
        properties: {
          productId: {
            type: "string",
            description: "商品ID",
          },
          warehouseId: {
            type: "string",
            description: "倉庫ID（省略時は全倉庫の合計）",
          },
        },
        required: ["productId"],
      },
    },
    {
      name: "create_support_ticket",
      description: "サポートチケットを作成します",
      inputSchema: {
        type: "object",
        properties: {
          title: { type: "string" },
          description: { type: "string" },
          priority: {
            type: "string",
            enum: ["low", "medium", "high", "critical"],
          },
          assigneeEmail: { type: "string" },
        },
        required: ["title", "description", "priority"],
      },
    },
  ],
}));
 
// ツール実行ハンドラー
server.setRequestHandler(CallToolRequestSchema, async (request) => {
  const { name, arguments: args } = request.params;
 
  switch (name) {
    case "get_product_inventory": {
      const { productId, warehouseId } = args as {
        productId: string;
        warehouseId?: string;
      };
      // 社内APIを呼び出す
      const inventory = await fetchInventory(productId, warehouseId);
      return {
        content: [
          {
            type: "text",
            text: JSON.stringify(inventory, null, 2),
          },
        ],
      };
    }
 
    case "create_support_ticket": {
      const ticket = args as {
        title: string;
        description: string;
        priority: string;
        assigneeEmail?: string;
      };
      const result = await createTicket(ticket);
      return {
        content: [
          {
            type: "text",
            text: `チケット #${result.id} を作成しました。URL: ${result.url}`,
          },
        ],
      };
    }
 
    default:
      throw new Error(`未知のツール: ${name}`);
  }
});
 
// サーバー起動
const transport = new StdioServerTransport();
await server.connect(transport);
console.error("MCP Server running on stdio");

// .antigravity/settings.json または ~/.antigravity/settings.json
{
  "mcpServers": {
    "my-company-api": {
      "command": "node",
      "args": ["/path/to/my-custom-mcp-server/dist/index.js"],
      "env": {
        "COMPANY_API_KEY": "YOUR_INTERNAL_API_KEY",
        "API_BASE_URL": "https://api.internal.company.com"
      }
    }
  }
}

# 推奨: .env.antigravity（.gitignoreに追加必須）
GITHUB_PERSONAL_ACCESS_TOKEN=ghp_YOUR_PERSONAL_ACCESS_TOKEN
SLACK_BOT_TOKEN=xoxb_YOUR_BOT_TOKEN
NOTION_API_KEY=secret_YOUR_NOTION_KEY
POSTGRES_URL=postgresql://user:pass@host/db