claudette-agent

A Claude Agent SDK wrapper with Claudette-compatible API. This package lets you use the familiar Claudette API while leveraging the Claude Agent SDK for your Claude Code subscription.

Installation

pip install claudette-agent

For structured outputs with Pydantic:

pip install claudette-agent[pydantic]

Requirements

• Python 3.10+
• Claude Code subscription (for claude-agent-sdk)
• claude-agent-sdk installed and configured

Quick Start

Basic Chat

import asyncio
from claudette_agent import Chat, contents

async def main():
    # Create a chat with a model and system prompt
    chat = Chat(model="claude-sonnet-4-5-20250929", sp="You are a helpful assistant")

    # Send a message
    response = await chat("Hello! What can you help me with?")
    print(contents(response))

    # Continue the conversation (maintains history)
    response = await chat("Can you explain that in more detail?")
    print(contents(response))

asyncio.run(main())

Simple Query (No History)

import asyncio
from claudette_agent import query, contents

async def main():
    # One-shot query
    response = await query("What is 2 + 2?")
    print(contents(response))

asyncio.run(main())

Using Tools

import asyncio
from claudette_agent import Chat, tool, contents

@tool
def calculate(expression: str) -> str:
    """Evaluate a mathematical expression."""
    return str(eval(expression))

@tool
def get_weather(city: str) -> str:
    """Get the weather for a city."""
    return f"The weather in {city} is sunny and 72F"

async def main():
    chat = Chat(
        model="claude-sonnet-4-5-20250929",
        sp="You are a helpful assistant with access to tools",
        tools=[calculate, get_weather]
    )

    response = await chat("What is 15 * 23?")
    print(contents(response))

asyncio.run(main())

Tool Loop (Automatic Tool Following)

import asyncio
from claudette_agent import Chat, tool, contents

@tool
def search(query: str) -> str:
    """Search for information."""
    return f"Results for '{query}': [relevant information]"

async def main():
    chat = Chat(model="claude-sonnet-4-5-20250929", tools=[search])

    # Automatically follow up tool calls
    results = await chat.toolloop(
        "Research Python async programming and summarize",
        max_steps=5
    )

    for result in results:
        print(contents(result))

asyncio.run(main())

Structured Outputs with Pydantic

import asyncio
from pydantic import BaseModel
from claudette_agent import Chat

class Person(BaseModel):
    """Information about a person."""
    name: str
    age: int
    occupation: str

async def main():
    chat = Chat(model="claude-sonnet-4-5-20250929")

    # Note: prompt comes first, then the model class
    person = await chat.struct(
        "Extract: John Smith is a 35-year-old software engineer",
        Person
    )

    print(f"Name: {person.name}")
    print(f"Age: {person.age}")
    print(f"Occupation: {person.occupation}")

asyncio.run(main())

Streaming Responses

Note: The Claude Agent SDK streams complete message blocks, not individual text characters like the Anthropic API. Each yielded value is a complete text block.

import asyncio
from claudette_agent import Chat

async def main():
    chat = Chat(model="claude-sonnet-4-5-20250929")

    # Each 'block' is a complete text block from the SDK, not a character stream
    async for block in chat.stream("Tell me a story about a brave knight"):
        print(block, end="", flush=True)

    print()  # Final newline

asyncio.run(main())

MCP Server Integration

import asyncio
from claudette_agent import (
    Chat, MCPToolkit, mcp_tool, create_mcp_server, contents
)

# Create tools for an MCP server
@mcp_tool("add", "Add two numbers", {"a": float, "b": float})
async def add(args):
    result = args['a'] + args['b']
    return {"content": [{"type": "text", "text": str(result)}]}

@mcp_tool("multiply", "Multiply two numbers", {"a": float, "b": float})
async def multiply(args):
    result = args['a'] * args['b']
    return {"content": [{"type": "text", "text": str(result)}]}

# Create MCP server
math_server = create_mcp_server("math", tools=[add, multiply])

async def main():
    # Use MCP toolkit for easier management
    toolkit = MCPToolkit()
    toolkit.add_sdk_server("math", [add, multiply])

    # Create chat with MCP servers
    chat = Chat(model="claude-sonnet-4-5-20250929", sp="You are a calculator assistant")
    chat.c.add_mcp_server("math", math_server)

    response = await chat("What is 15 + 27?")
    print(contents(response))

asyncio.run(main())

Cost Tracking

import asyncio
from claudette_agent import Chat, contents

async def main():
    chat = Chat(model="claude-sonnet-4-5-20250929")

    await chat("Explain quantum computing")
    await chat("What are its applications?")

    # Check usage
    print(f"Total tokens: {chat.use.total}")
    print(f"Input tokens: {chat.use.input_tokens}")
    print(f"Output tokens: {chat.use.output_tokens}")
    print(f"Cost: ${chat.cost:.6f}")

asyncio.run(main())

Stateless Queries (setting_sources)

By default, claudette-agent runs in stateless mode, which is ideal for independent API queries:

import asyncio
from claudette_agent import Chat, AsyncChat

async def main():
    # Stateless by default (setting_sources=[])
    # Each query is independent - no Claude Code settings loaded
    chat = Chat(
        model="claude-sonnet-4-5-20250929",
        sp="You are a helpful assistant.",
        setting_sources=[]  # Default - shown for clarity
    )

    # Explicit stateless mode
    response = await chat("What is the meaning of life?")

    # With session persistence (loads Claude Code settings)
    session_chat = AsyncChat(
        model="claude-sonnet-4-5-20250929",
        setting_sources=['user', 'project', 'local']
    )

asyncio.run(main())

The setting_sources parameter controls what Claude Code loads at startup:

• [] (empty/default) = Stateless mode, no settings loaded
• ['user'] = Load user settings from ~/.claude/
• ['project'] = Load project settings from .claude/
• ['local'] = Load local settings
• ['user', 'project', 'local'] = Full session persistence

API Reference

Core Classes

• Client: Low-level client for direct API calls
• AsyncClient: Async version of Client
• Chat: High-level chat interface with conversation history
• AsyncChat: Async version of Chat

Key Functions

• contents(response): Extract text content from a response
• query(prompt): Simple one-shot query (async)
• tool: Decorator to mark functions as tools
• mk_msg(content): Create a message dict
• mk_msgs(msgs): Convert messages to API format

Structured Outputs

• claude_schema(model): Generate Claude schema from Pydantic model
• chat.struct(prompt, ModelClass): Get structured output as Pydantic model

MCP Integration

• MCPServer: Create and manage MCP servers
• MCPToolkit: Manage multiple MCP servers
• mcp_tool: Decorator for MCP-compatible tools
• create_mcp_server: Create an MCP server

Comparison with Claudette

This package provides the same API as Claudette, but uses the Claude Agent SDK instead of the Anthropic Python SDK. This means:

Migration from Claudette

Simply change your import:

# Before (Claudette)
from claudette import Chat, contents

# After (claudette-agent)
from claudette_agent import Chat, contents

Most code should work with minor changes:

1. Async by default: All Chat methods are async and need await
2. Model parameter: Pass model="claude-sonnet-4-5-20250929" to Chat()
3. struct signature: Use chat.struct(prompt, ModelClass) (prompt first)
4. MCP support: Additional MCP server integration features
5. Streaming: SDK streams message blocks, not text chunks (less granular but still works)

License

MIT License - see LICENSE file for details.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.