コンテキストとセッション

// First call - establishes context and creates task
const result = await call('create_media_buy', {
  brief: "Launch summer campaign"
});

const contextId = result.context_id;  // 会話継続に使用
const taskId = result.task_id;        // このメディアバイを追跡

// 同じ会話内の後続呼び出し - context_id を使用
const update1 = await call('update_media_buy', {
  context_id: contextId,    // Maintains conversation state
  task_id: taskId,          // References the specific media buy
  updates: {...}
});

// 数日後の別会話 - task_id のみで十分
const delivery = await call('get_media_buy_delivery', {
  task_id: taskId          // No context_id - this is a new conversation
});

// A2A はコンテキストを自動管理
const task = await a2a.send({ message: {...} });
// contextId is managed by A2A protocol

// Follow-ups automatically use the same context
const followUp = await a2a.send({
  contextId: task.contextId,  // 任意 - A2A が追跡
  message: {...}
});

// First call - no context
const result1 = await mcp.call('get_products', {
  brief: "Video ads"
});
const contextId = result1.context_id;  // 保存しておく！

// Follow-up - must include context_id
const result2 = await mcp.call('get_products', {
  context_id: contextId,  // 継続に必須
  brief: "Focus on premium inventory"
});

class MCPSession {
  constructor(mcp) {
    this.mcp = mcp;
    this.contextId = null;
  }

  async call(method, params) {
    const result = await this.mcp.call(method, {
      ...params,
      context_id: this.contextId
    });
    this.contextId = result.context_id;  // 次の呼び出し用に更新
    return result;
  }
}

server.tool('get_products', schema, async (args, extra) => {
  // 明示的な context_id があればそれを使用し、なければ MCP sessionId にフォールバック
  const contextId = args.context_id ?? extra?.sessionId;

  const products = await generateProducts(args.brief, contextId);
  await productStore.save(contextId, products);

  return products;
});

{
  "product_id": "ctv_premium",
  "name": "Connected TV Premium Inventory",
  "ext": {
    "gam": {
      "order_id": "1234567890",
      "dashboard_url": "https://..."
    },
    "roku": {
      "content_genres": ["comedy", "drama"]
    }
  }
}

// ✅ Correct - Namespaced
{
  "ext": {
    "gam": { "test_mode": true },
    "roku": { "app_ids": ["123"] }
  }
}

// ❌ Incorrect - Not namespaced
{
  "ext": {
    "test_mode": true,  // Missing namespace!
    "app_ids": ["123"]  // Which platform?
  }
}

{
  "tool": "create_media_buy",
  "arguments": {
    "packages": [...],
    "context": {
      "ui_session_id": "sess_abc123",
      "trace_id": "trace_xyz789",
      "internal_campaign_id": "camp_456"
    }
  }
}

{
  "status": "input-required",
  "message": "Media buy requires manual approval before activation.",
  "context_id": "ctx_ghi789",
  "context": {
    "ui_session_id": "sess_abc123",
    "trace_id": "trace_xyz789",
    "internal_campaign_id": "camp_456"
  }
}