Strands Agents SDK 入門 — マルチエージェントで専門家チームを作る

from strands import Agent, tool
from strands.models import BedrockModel
 
bedrock_model = BedrockModel(
    model_id="us.anthropic.claude-sonnet-4-20250514-v1:0",
    region_name="us-east-1",
)

@tool
def summarizer(text: str) -> str:
    """Summarize the given text into 2-3 concise sentences.
 
    Args:
        text: The text to summarize
 
    Returns:
        A concise summary
    """
    summary_agent = Agent(
        model=bedrock_model,
        system_prompt="You are a summarization specialist. "
        "Summarize the given text into 2-3 concise sentences. Be factual and precise.",
        callback_handler=None,
    )
    result = summary_agent(f"Summarize this: {text}")
    return result.message['content'][0]['text']
 
@tool
def translator(text: str, target_language: str) -> str:
    """Translate the given text into the specified language.
 
    Args:
        text: The text to translate
        target_language: The target language (e.g. Japanese, Spanish, French)
 
    Returns:
        The translated text
    """
    translation_agent = Agent(
        model=bedrock_model,
        system_prompt="You are a professional translator. "
        "Translate the given text accurately into the target language. "
        "Return only the translation, no explanations.",
        callback_handler=None,
    )
    result = translation_agent(f"Translate the following into {target_language}: {text}")
    return result.message['content'][0]['text']

orchestrator = Agent(
    model=bedrock_model,
    system_prompt="You are an assistant that coordinates specialized agents. "
    "Use the summarizer tool for summarization tasks and the translator tool "
    "for translation tasks. You can chain them: summarize first, then translate the summary.",
    tools=[summarizer, translator],
    callback_handler=None,
)
 
text = (
    "Amazon Bedrock is a fully managed service that offers a choice of "
    "high-performing foundation models from leading AI companies like "
    "AI21 Labs, Anthropic, Cohere, Meta, Mistral AI, Stability AI, and "
    "Amazon through a single API, along with a broad set of capabilities "
    "you need to build generative AI applications with security, privacy, "
    "and responsible AI."
)
 
result = orchestrator(
    f"Summarize the following text, then translate the summary into Japanese:\n\n{text}"
)

**Summary:** Amazon Bedrock is a fully managed service that provides access to
high-performing foundation models from leading AI companies including AI21 Labs,
Anthropic, Cohere, Meta, Mistral AI, Stability AI, and Amazon through a single
API. The service offers comprehensive capabilities for building generative AI
applications while maintaining security, privacy, and responsible AI practices.
 
**Japanese Translation:** Amazon Bedrockは、AI21 Labs、Anthropic、Cohere、Meta、
Mistral AI、Stability AI、およびAmazonを含む主要なAI企業の高性能基盤モデルに
単一のAPIを通じてアクセスを提供する完全管理サービスです。このサービスは、
セキュリティ、プライバシー、および責任あるAI慣行を維持しながら、生成AI
アプリケーションを構築するための包括的な機能を提供します。

Cycles: 3
Tools used: ['summarizer', 'translator']
Tokens: 3294