ツール使用の実装方法

import anthropic

client = anthropic.Anthropic()

# Define tools
tools = [
    {
        "name": "get_weather",
        "description": "Get the current weather in a given location",
        "input_schema": {
            "type": "object",
            "properties": {
                "location": {
                    "type": "string",
                    "description": "The city and state, e.g. San Francisco, CA"
                }
            },
            "required": ["location"]
        }
    },
    {
        "name": "get_time",
        "description": "Get the current time in a given timezone",
        "input_schema": {
            "type": "object",
            "properties": {
                "timezone": {
                    "type": "string",
                    "description": "The timezone, e.g. America/New_York"
                }
            },
            "required": ["timezone"]
        }
    }
]

# Initial request
response = client.messages.create(
    model="claude-sonnet-4-5",
    max_tokens=1024,
    tools=tools,
    messages=[
        {
            "role": "user",
            "content": "What's the weather in SF and NYC, and what time is it there?"
        }
    ]
)

# Claude's response with parallel tool calls
print("Claude wants to use tools:", response.stop_reason == "tool_use")
print("Number of tool calls:", len([c for c in response.content if c.type == "tool_use"]))

# Build the conversation with tool results
messages = [
    {
        "role": "user",
        "content": "What's the weather in SF and NYC, and what time is it there?"
    },
    {
        "role": "assistant",
        "content": response.content  # Contains multiple tool_use blocks
    },
    {
        "role": "user",
        "content": [
            {
                "type": "tool_result",
                "tool_use_id": "toolu_01",  # Must match the ID from tool_use
                "content": "San Francisco: 68°F, partly cloudy"
            },
            {
                "type": "tool_result",
                "tool_use_id": "toolu_02",
                "content": "New York: 45°F, clear skies"
            },
            {
                "type": "tool_result",
                "tool_use_id": "toolu_03",
                "content": "San Francisco time: 2:30 PM PST"
            },
            {
                "type": "tool_result",
                "tool_use_id": "toolu_04",
                "content": "New York time: 5:30 PM EST"
            }
        ]
    }
]

# Get final response
final_response = client.messages.create(
    model="claude-sonnet-4-5",
    max_tokens=1024,
    tools=tools,
    messages=messages
)

print(final_response.content[0].text)

#!/usr/bin/env python3
"""Test script to verify parallel tool calls with the Claude API"""

import os
from anthropic import Anthropic

# Initialize client
client = Anthropic(api_key=os.environ.get("ANTHROPIC_API_KEY"))

# Define tools
tools = [
    {
        "name": "get_weather",
        "description": "Get the current weather in a given location",
        "input_schema": {
            "type": "object",
            "properties": {
                "location": {
                    "type": "string",
                    "description": "The city and state, e.g. San Francisco, CA"
                }
            },
            "required": ["location"]
        }
    },
    {
        "name": "get_time",
        "description": "Get the current time in a given timezone",
        "input_schema": {
            "type": "object",
            "properties": {
                "timezone": {
                    "type": "string",
                    "description": "The timezone, e.g. America/New_York"
                }
            },
            "required": ["timezone"]
        }
    }
]

# Test conversation with parallel tool calls
messages = [
    {
        "role": "user",
        "content": "What's the weather in SF and NYC, and what time is it there?"
    }
]

# Make initial request
print("Requesting parallel tool calls...")
response = client.messages.create(
    model="claude-sonnet-4-5",
    max_tokens=1024,
    messages=messages,
    tools=tools
)

# Check for parallel tool calls
tool_uses = [block for block in response.content if block.type == "tool_use"]
print(f"\n✓ Claude made {len(tool_uses)} tool calls")

if len(tool_uses) > 1:
    print("✓ Parallel tool calls detected!")
    for tool in tool_uses:
        print(f"  - {tool.name}: {tool.input}")
else:
    print("✗ No parallel tool calls detected")

# Simulate tool execution and format results correctly
tool_results = []
for tool_use in tool_uses:
    if tool_use.name == "get_weather":
        if "San Francisco" in str(tool_use.input):
            result = "San Francisco: 68°F, partly cloudy"
        else:
            result = "New York: 45°F, clear skies"
    else:  # get_time
        if "Los_Angeles" in str(tool_use.input):
            result = "2:30 PM PST"
        else:
            result = "5:30 PM EST"

    tool_results.append({
        "type": "tool_result",
        "tool_use_id": tool_use.id,
        "content": result
    })

# Continue conversation with tool results
messages.extend([
    {"role": "assistant", "content": response.content},
    {"role": "user", "content": tool_results}  # All results in one message!
])

# Get final response
print("\nGetting final response...")
final_response = client.messages.create(
    model="claude-sonnet-4-5",
    max_tokens=1024,
    messages=messages,
    tools=tools
)

print(f"\nClaude's response:\n{final_response.content[0].text}")

# Verify formatting
print("\n--- Verification ---")
print(f"✓ Tool results sent in single user message: {len(tool_results)} results")
print("✓ No text before tool results in content array")
print("✓ Conversation formatted correctly for future parallel tool use")