[アップデート] Amazon Bedrock AgentCore Gateway のターゲットに Web Search ツールが追加されたので試してみた

Here is a comprehensive summary of all the new features announced for **Amazon Bedrock AgentCore** at **AWS Summit New York 2026** (June 17, 2026):

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## 🚀 Amazon Bedrock AgentCore — New Feature Announcements at AWS Summit New York 2026

The overarching theme was: **"Build, connect, and optimize production agents securely at scale."** The announcements fell into three pillars: broader knowledge, production observability/optimization, and scalable governance.

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### 1. 🔍 Web Search on Amazon Bedrock AgentCore — **Generally Available**
- A **fully managed web search tool** that enables agents to ground their responses in **current, cited web knowledge**.
- Uses **AWS's own search index**, meaning queries never leave the customer's secured AWS environment — **zero data egress**.
- Available at **no additional cost** (customers pay only for Gateway data transfer charges).
- Now **GA in the US East (N. Virginia)** Region.
- *Source: [AWS News Blog](https://aws.amazon.com/blogs/aws/announcing-web-search-on-amazon-bedrock-agentcore-ground-your-ai-agents-in-current-accurate-web-knowledge/)*

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### 2. 🗂️ Amazon Bedrock Managed Knowledge Base — **New Launch**
- A new capability that **automatically manages and scales the end-to-end RAG (Retrieval-Augmented Generation) pipeline** for enterprise knowledge agents.
- Features include:
  - **Native data connectors** selectable from a dropdown
  - **Smart Parsing** for automatic multi-format data preparation
  - **Agentic Retriever** for complex multi-step queries
  - **Auto-generated IAM roles** for permissions management
- **Natively integrated with AgentCore Gateway** as a pre-built target type (alongside MCP server, Lambda ARN, REST API, etc.), with built-in observability, policy enforcement, and automatic permission management.
- *Source: [AWS News Blog](https://aws.amazon.com/blogs/aws/introducing-amazon-bedrock-managed-knowledge-base-for-faster-more-accurate-enterprise-ai-applications/)*

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### 3. 🛠️ New Optimization Capabilities — **Continuous Improvement for Production Agents**
- Turns **production traces into continuous improvement loops** for agents, addressing silent failures that produce no error signal.
- The loop covers: understanding what agents are doing → generating data-grounded fixes → proving they work.
- New capabilities include:
  - **Failure, intent, and trajectory insights** — available in **preview** in 13 AWS Regions
  - **Batch evaluations, recommendations, and A/B tests** — **generally available** in 14 AWS Regions
- *Source: [AWS What's New](https://aws.amazon.com/about-aws/whats-new/2026/06/amazon-bedrock-agentcore-new-optimization-capabilities/)*

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### 4. ⚙️ AgentCore Harness — **Generally Available**
- The **managed agent harness** (previously in preview) is now **generally available**.
- Allows developers to **build and run production-grade AI agents in minutes — without coding orchestration loops** — simply by defining the agent's model, tools, skills, and instructions in configuration.

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### 5. 🌐 Coming Soon: AWS Context (Integration with AgentCore)
- A brand-new companion service, **AWS Context**, was announced that automatically maps relationships across organizational data into a **knowledge graph**.
- It provides **agentic search** so agents can access governed data relationships, business rules, and domain knowledge at runtime — deeply integrated with the AgentCore ecosystem.

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### Summary Table

| Feature | Status | Key Benefit |
|---|---|---|
| Web Search on AgentCore | **GA** | Current, cited web knowledge inside AWS environment |
| Managed Knowledge Base | **New Launch** | Fully managed RAG pipeline with native AgentCore Gateway integration |
| Optimization Capabilities (Failure/Intent/Trajectory Insights) | **Preview** (13 Regions) | Detect silent production failures |
| Optimization Capabilities (Batch Evals, A/B Tests) | **GA** (14 Regions) | Continuous agent improvement loop |
| AgentCore Harness | **GA** | No-code orchestration for production agents |
| AWS Context (Knowledge Graph) | **Coming Soon** | Org-wide agentic knowledge access |

These announcements were positioned as helping customers **connect agents to broader knowledge sources, continuously improve them in production, and enforce controls that scale as agents grow more capable**.