claude-code-adapter-fastapi

API文档

中文

English

本文档详细说明Claude Code Adapter FastAPI的API接口。

🌐 基础信息

Base URL: http://localhost:8000
API版本: v1
内容类型: application/json

📋 端点列表

健康检查

GET /health

检查服务健康状态。

响应示例:

{
  "ok": true,
  "target_base": "http://127.0.0.1:1234"
}

状态码:

200 OK: 服务正常

消息代理

POST /v1/messages

代理消息请求到目标服务，支持工具调用。

请求体:

{
  "model": "string",
  "messages": [
    {
      "role": "user|assistant|system",
      "content": "string|object|array"
    }
  ],
  "max_tokens": 4096,
  "temperature": 0.1,
  "stream": false,
  "system": "string",
  "tools": [
    {
      "name": "string",
      "description": "string",
      "input_schema": {
        "type": "object",
        "properties": {},
        "required": []
      }
    }
  ]
}

响应示例:

非流式响应:

{
  "id": "msg_1234567890",
  "type": "message",
  "role": "assistant",
  "model": "target-model",
  "stop_reason": "end_turn|tool_use",
  "stop_sequence": null,
  "usage": {
    "input_tokens": 100,
    "output_tokens": 50
  },
  "content": [
    {
      "type": "text",
      "text": "Hello! How can I help you?"
    }
  ]
}

工具调用响应:

{
  "id": "msg_1234567890",
  "type": "message",
  "role": "assistant",
  "model": "target-model",
  "stop_reason": "tool_use",
  "stop_sequence": null,
  "usage": {
    "input_tokens": 100,
    "output_tokens": 50
  },
  "content": [
    {
      "type": "text",
      "text": "I'll help you with that."
    },
    {
      "type": "tool_use",
      "id": "call_123",
      "name": "get_weather",
      "input": {
        "location": "Beijing"
      }
    }
  ]
}

流式响应:

data: {"id": "msg_123", "object": "chat.completion.chunk", "choices": [{"delta": {"content": "Hello"}}]}

data: {"id": "msg_123", "object": "chat.completion.chunk", "choices": [{"delta": {"content": "!"}}]}

data: [DONE]

状态码:

200 OK: 请求成功
400 Bad Request: 请求格式错误
500 Internal Server Error: 服务器内部错误
502 Bad Gateway: 目标服务错误

🔧 工具调用

工具定义处理策略

系统根据配置自动选择工具定义的处理方式，以优化性能和功能完整性：

📍 工具定义位置

配置状态	工具定义位置	优势	适用场景
`enable_tool_selection: true`	作为用户消息追加	避免系统提示词缓存失效，提高性能	动态工具选择、高性能场景
`enable_tool_selection: false`	拼接到系统提示词	确保模型始终了解所有可用工具，保证功能完整性	稳定所有工具支持、传统场景

🔄 处理流程

检查配置: 读取 enable_tool_selection 设置
选择策略:
- true: 工具定义 → 用户消息
- false: 工具定义 → 系统提示词
格式转换: 将工具定义转换为相应的提示词格式
消息构建: 按选定策略构建最终消息列表

工具定义格式

{
  "name": "tool_name",
  "description": "Tool description",
  "input_schema": {
    "type": "object",
    "properties": {
      "param1": {
        "type": "string",
        "description": "Parameter description"
      },
      "param2": {
        "type": "number",
        "description": "Another parameter"
      }
    },
    "required": ["param1"]
  }
}

工具调用格式

模型响应中的工具调用格式：

{
  "type": "tool_use",
  "id": "call_123",
  "name": "tool_name",
  "input": {
    "param1": "value1",
    "param2": 42
  }
}

📝 请求示例

基本对话

curl -X POST "http://localhost:8000/v1/messages" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "test-model",
    "messages": [
      {
        "role": "user",
        "content": "Hello, how are you?"
      }
    ]
  }'

带工具的请求

curl -X POST "http://localhost:8000/v1/messages" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "test-model",
    "messages": [
      {
        "role": "user",
        "content": "What is the weather like in Beijing?"
      }
    ],
    "tools": [
      {
        "name": "get_weather",
        "description": "Get current weather information",
        "input_schema": {
          "type": "object",
          "properties": {
            "location": {
              "type": "string",
              "description": "The city name"
            }
          },
          "required": ["location"]
        }
      }
    ]
  }'

流式请求

curl -X POST "http://localhost:8000/v1/messages" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "test-model",
    "messages": [
      {
        "role": "user",
        "content": "Tell me a story"
      }
    ],
    "stream": true
  }'

🔄 消息格式转换

Anthropic → OpenAI

输入 (Anthropic格式):

{
  "model": "claude-3-sonnet",
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ],
  "system": "You are a helpful assistant",
  "tools": [
    {
      "name": "get_weather",
      "description": "Get weather"
    }
  ]
}

转换后 (OpenAI格式):

未启用工具选择时 (enable_tool_selection: false):

{
  "model": "claude-3-sonnet",
  "messages": [
    {
      "role": "system",
      "content": "You are a helpful assistant\n\nYou have access to the following tools..."
    },
    {
      "role": "user",
      "content": "Hello"
    }
  ]
}

启用工具选择时 (enable_tool_selection: true):

{
  "model": "claude-3-sonnet",
  "messages": [
    {
      "role": "system",
      "content": "You are a helpful assistant"
    },
    {
      "role": "user",
      "content": "Hello"
    },
    {
      "role": "user",
      "content": "You have access to the following tools..."
    }
  ]
}

OpenAI → Anthropic

输入 (OpenAI响应):

{
  "choices": [
    {
      "message": {
        "content": "I'll help you with that.\n\n```json\n{\"type\": \"tool_use\", \"id\": \"call_123\", \"name\": \"get_weather\", \"input\": {\"location\": \"Beijing\"}}\n```"
      }
    }
  ]
}

转换后 (Anthropic格式):

{
  "content": [
    {
      "type": "text",
      "text": "I'll help you with that."
    },
    {
      "type": "tool_use",
      "id": "call_123",
      "name": "get_weather",
      "input": {
        "location": "Beijing"
      }
    }
  ],
  "stop_reason": "tool_use"
}

🚨 错误处理

错误响应格式

{
  "detail": "Error message description"
}

常见错误

状态码	错误类型	说明
400	Bad Request	请求格式错误
500	Internal Server Error	服务器内部错误
502	Bad Gateway	目标服务不可用

错误示例

{
  "detail": "invalid json body"
}

{
  "detail": "request failed: Connection refused"
}

📊 性能指标

响应时间

健康检查: < 10ms
简单对话: < 100ms
工具调用: < 200ms

并发支持

最大并发连接: 1000
推荐并发连接: 100

🔐 安全考虑

API密钥

通过环境变量或配置文件设置
不要在请求中明文传输
定期轮换密钥

请求限制

建议实施速率限制
监控异常请求
记录访问日志

📚 更多资源

🔗 相关文档

🚀 快速开始指南 - 安装和基本使用
⚙️ 配置说明 - 详细配置选项
🛠️ 开发指南 - 开发和调试指南

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