Claude Code SDK for Python (Shmaxi Fork)

This is a fork of the official Claude Code SDK with fixes for FastAPI integration and subprocess handling issues.

Fork Changes

This fork includes the following fixes:

• Subprocess hanging fix: Uses DEVNULL for stdin to prevent the CLI subprocess from waiting for input
• JSON parsing fix: Properly handles multiple JSON objects on the same line
• Thread safety: Better integration with async web frameworks like FastAPI

See the Claude Code SDK documentation for general usage information.

Installation

pip install claude-code-sdk-shmaxi

Prerequisites:

• Python 3.10+
• Node.js
• Claude Code: npm install -g @anthropic-ai/claude-code

Quick Start

import anyio
from claude_code_sdk import query

async def main():
    async for message in query(prompt="What is 2 + 2?"):
        print(message)

anyio.run(main)

Usage

Basic Query

from claude_code_sdk import query, ClaudeCodeOptions, AssistantMessage, TextBlock

# Simple query
async for message in query(prompt="Hello Claude"):
    if isinstance(message, AssistantMessage):
        for block in message.content:
            if isinstance(block, TextBlock):
                print(block.text)

# With options
options = ClaudeCodeOptions(
    system_prompt="You are a helpful assistant",
    max_turns=1
)

async for message in query(prompt="Tell me a joke", options=options):
    print(message)

Using Tools

options = ClaudeCodeOptions(
    allowed_tools=["Read", "Write", "Bash"],
    permission_mode='acceptEdits'  # auto-accept file edits
)

async for message in query(
    prompt="Create a hello.py file", 
    options=options
):
    # Process tool use and results
    pass

Working Directory

from pathlib import Path

options = ClaudeCodeOptions(
    cwd="/path/to/project"  # or Path("/path/to/project")
)

API Reference

query(prompt, options=None)

Main async function for querying Claude.

Parameters:

• prompt (str): The prompt to send to Claude
• options (ClaudeCodeOptions): Optional configuration

Returns: AsyncIterator[Message] - Stream of response messages

Types

See src/claude_code_sdk/types.py for complete type definitions:

• ClaudeCodeOptions - Configuration options
• AssistantMessage, UserMessage, SystemMessage, ResultMessage - Message types
• TextBlock, ToolUseBlock, ToolResultBlock - Content blocks

Error Handling

from claude_code_sdk import (
    ClaudeSDKError,      # Base error
    CLINotFoundError,    # Claude Code not installed
    CLIConnectionError,  # Connection issues
    ProcessError,        # Process failed
    CLIJSONDecodeError,  # JSON parsing issues
)

try:
    async for message in query(prompt="Hello"):
        pass
except CLINotFoundError:
    print("Please install Claude Code")
except ProcessError as e:
    print(f"Process failed with exit code: {e.exit_code}")
except CLIJSONDecodeError as e:
    print(f"Failed to parse response: {e}")

See src/claude_code_sdk/_errors.py for all error types.

Available Tools

See the Claude Code documentation for a complete list of available tools.

Examples

See examples/quick_start.py for a complete working example.

License

MIT