pctx-client 0.1.0rc1

Python client for using Code Mode via PCTX

PCTX Python Client

Python client for using Code Mode via PCTX - execute JavaScript code with access to your Python functions.

Installation

pip install pctx-client

Quick Start

1. Install PCTX server

# Homebrew
brew install portofcontext/tap/pctx

# cURL
curl --proto '=https' --tlsv1.2 -LsSf https://raw.githubusercontent.com/portofcontext/pctx/main/install.sh | sh

# npm
npm i -g @portofcontext/pctx

2. Install Python pctx with the langchain extra

pip install pctx-client[langchain] langchain

3. Start the Code Mode server for agents

pctx agent start

4. Define and run main.py

import asyncio

from pctx_client import Pctx, tool
from langchain.agents import create_agent

# Define your tools
@tool
def get_weather(city: str) -> str:
    """Get weather for a given city."""
    return f"It's always sunny in {city}!"


@tool
def get_time(city: str) -> str:
    """Get time for a given city."""
    return f"It is midnight in {city}!"


async def main():
    # Initialize client with your tools
    p = Pctx(tools=[get_weather, get_time])

    # Define your agent
    agent = create_agent(
        model="anthropic:claude-sonnet-4-5-20250929", # choose any model supported by langchain!
        tools=p.langchain_tools(),
        system_prompt="You are a helpful assistant",
    )

    # Connect to PCTX
    await p.connect()

    result = await agent.ainvoke(
        {
            "messages": [
                {"role": "user", "content": "what is the weather and time in nyc"}
            ]
        }
    )

    print(result)

    # Disconnect when done
    await p.disconnect()

if __name__ == "__main__":
    asyncio.run(main())

Features

• Tool Decorator: Easily expose Python functions as callable tools
• Async Support: Full async/await support for non-blocking operations
• MCP Server Integration: Connect to MCP servers for extended functionality

Usage

Defining Tools

Use the @tool decorator to expose Python functions:

@tool("function_name", namespace="namespace")
def my_function(arg1: str, arg2: int) -> str:
    """Function description"""
    return f"{arg1}: {arg2}"

List Available Functions

functions = await p.list_functions()
print(functions.code)

Get Function Details

details = await p.get_function_details(["Namespace.functionName"])
print(details.code)

Optional Integrations

LangChain

pip install pctx[langchain]

CrewAI

pip install pctx[crewai]