Tool invocation (function call)

Developing

POST

/v1/messages

Invoke functions
Only supports Claude series models, available by default in the group

Request

Header Params

Body Params application/json

Example

{
    "model": "claude-3-5-sonnet-20241022",
    "messages": [
        {
            "role": "user",
            "content": "What's the weather like in Beijing today?"
        }
    ],
    "tools": [
        {
            "name": "get_weather",
            "description": "Get the current weather for a specified location",
            "input_schema": {
                "type": "object",
                "properties": {
                    "location": {
                        "type": "string",
                        "description": "City name, e.g.: Beijing"
                    }
                },
                "required": [
                    "location"
                ]
            }
        }
    ]
}

Request Code Samples

Shell

JavaScript

Java

Swift

PHP

Python

HTTP

Objective-C

Ruby

OCaml

Dart

curl --location '/v1/messages' \
--header 'anthropic-version: 2023-06-01' \
--header 'Authorization: {{Authorization}}' \
--header 'Content-Type: application/json' \
--data '{
    "model": "claude-3-5-sonnet-20241022",
    "messages": [
        {
            "role": "user",
            "content": "What'\''s the weather like in Beijing today?"
        }
    ],
    "tools": [
        {
            "name": "get_weather",
            "description": "Get the current weather for a specified location",
            "input_schema": {
                "type": "object",
                "properties": {
                    "location": {
                        "type": "string",
                        "description": "City name, e.g.: Beijing"
                    }
                },
                "required": [
                    "location"
                ]
            }
        }
    ]
}'

Responses

🟢200成功

application/json

Bodyapplication/json

Example

{
    "content": [
        {
            "text": "Let me help you check the weather in Beijing.",
            "type": "text"
        },
        {
            "id": "toolu_012f3meaYuYj9yPPuyuRVw9U",
            "input": {
                "location": "Beijing"
            },
            "name": "get_weather",
            "type": "tool_use"
        }
    ],
    "id": "msg_0195XjbG2FGZfN7Dqkd9kyyW",
    "model": "claude-sonnet-4-20250514",
    "role": "assistant",
    "stop_reason": "tool_use",
    "stop_sequence": null,
    "type": "message",
    "usage": {
        "cache_creation_input_tokens": 0,
        "cache_read_input_tokens": 0,
        "input_tokens": 478,
        "output_tokens": 71,
        "service_tier": "standard"
    }
}

Modified at 2026-10-19 10:10:04

Chat (deep reasoning)

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