LangChain UTCP Adapters

A Python package that bridges Universal Tool Calling Protocol (UTCP) with LangChain, enabling seamless integration of external tools and APIs into LangChain applications.

Features

• Direct UTCP Integration: Work directly with UTCP clients for maximum flexibility
• Automatic Tool Conversion: Convert UTCP tools to LangChain-compatible tools with proper schemas
• Tool Discovery: Search and filter tools by name, description, and tags
• Dynamic Call Template Registration: Register call templates programmatically at runtime
• Async Support: Full async/await implementation for optimal performance
• Type Safety: Complete type hints and Pydantic v2 compatibility
• UTCP 1.0.1+ Compatible: Works with the latest UTCP plugin architecture

Installation

Basic Installation

pip install langchain-utcp-adapters

Required UTCP Plugins

The adapters require UTCP core and relevant protocol plugins:

# Core UTCP library (automatically installed)
pip install utcp>=1.0.0

# Protocol plugins (install as needed)
pip install utcp-http>=1.0.0    # For HTTP/REST APIs
pip install utcp-text>=1.0.0    # For text-based manuals
pip install utcp-mcp>=1.0.0     # For MCP integration

Optional Dependencies

# Using pip
pip install langchain-utcp-adapters[examples]  # LangGraph + OpenAI
pip install langchain-utcp-adapters[bedrock]   # Amazon Bedrock
pip install langchain-utcp-adapters[all]       # Everything

# Using PDM
pdm install -G examples  # LangGraph + OpenAI examples
pdm install -G bedrock   # Amazon Bedrock integration
pdm install -G test      # Testing dependencies
pdm install -G dev       # Development tools
pdm install -G all       # Everything for development

Quick Start

Basic Usage

import asyncio
from utcp.utcp_client import UtcpClient
from utcp.data.utcp_client_config import UtcpClientConfig
from utcp_http.http_call_template import HttpCallTemplate
from langchain_utcp_adapters import load_utcp_tools, search_utcp_tools

async def main():
    # Create UTCP client with call templates
    config = UtcpClientConfig(
        manual_call_templates=[
            HttpCallTemplate(
                name="petstore",
                call_template_type="http",
                url="https://petstore.swagger.io/v2/swagger.json",
                http_method="GET"
            )
        ]
    )
    client = await UtcpClient.create(config=config)
    
    # Load all tools and convert to LangChain format
    tools = await load_utcp_tools(client)
    print(f"Loaded {len(tools)} tools")
    
    # Search for specific tools
    pet_tools = await search_utcp_tools(client, "pet", max_results=5)
    print(f"Found {len(pet_tools)} pet-related tools")

asyncio.run(main())

Using Configuration Files

import asyncio
from utcp.utcp_client import UtcpClient
from langchain_utcp_adapters import load_utcp_tools

async def main():
    # Create client with config.json configuration
    client = await UtcpClient.create(config="config.json")
    
    # Load tools from all configured call templates
    tools = await load_utcp_tools(client)
    
    # Use tools with LangChain agents...

asyncio.run(main())

config.json:

{
  "manual_call_templates": [
    {
      "name": "petstore",
      "call_template_type": "http",
      "url": "https://petstore.swagger.io/v2/swagger.json",
      "http_method": "GET"
    }
  ]
}

LangGraph Integration

import asyncio
from utcp.utcp_client import UtcpClient
from utcp.data.utcp_client_config import UtcpClientConfig
from utcp_http.http_call_template import HttpCallTemplate
from langchain_utcp_adapters import load_utcp_tools
from langgraph.prebuilt import create_react_agent
from langchain_openai import ChatOpenAI

async def main():
    # Set up UTCP client
    config = UtcpClientConfig(
        manual_call_templates=[
            HttpCallTemplate(
                name="petstore",
                call_template_type="http",
                url="https://petstore.swagger.io/v2/swagger.json",
                http_method="GET"
            )
        ]
    )
    client = await UtcpClient.create(config=config)
    
    # Load tools
    tools = await load_utcp_tools(client)
    
    # Create LangGraph agent
    llm = ChatOpenAI(model="gpt-4o-mini")
    agent = create_react_agent(llm, tools)
    
    # Use the agent
    response = await agent.ainvoke({
        "messages": [("user", "Find information about pets in the store")]
    })
    
    print(response["messages"][-1].content)

# Make sure to set OPENAI_API_KEY environment variable
asyncio.run(main())

Amazon Bedrock Integration

import asyncio
from utcp.utcp_client import UtcpClient
from utcp.data.utcp_client_config import UtcpClientConfig
from utcp_http.http_call_template import HttpCallTemplate
from langchain_utcp_adapters import load_utcp_tools, create_bedrock_tool_mapping
from langgraph.prebuilt import create_react_agent
from langchain_aws import ChatBedrock

async def main():
    # Set up UTCP client
    config = UtcpClientConfig(
        manual_call_templates=[
            HttpCallTemplate(
                name="openlibrary",
                call_template_type="http",
                http_method="GET",
                url="https://openlibrary.org/static/openapi.json",
                content_type="application/json"
            )
        ]
    )
    client = await UtcpClient.create(config=config)
    
    # Load tools and create Bedrock-compatible versions
    original_tools = await load_utcp_tools(client)
    bedrock_tools, name_mapping = create_bedrock_tool_mapping(original_tools)
    
    # Create Bedrock LLM
    llm = ChatBedrock(
        model_id="anthropic.claude-3-haiku-20240307-v1:0",
        region_name="us-east-1"
    )
    
    # Create LangGraph agent
    agent = create_react_agent(llm, bedrock_tools)
    
    # Use the agent
    response = await agent.ainvoke({
        "messages": [("user", "Search for books about Python programming")]
    })
    
    print(response["messages"][-1].content)

# Make sure AWS credentials are configured
asyncio.run(main())

Authentication

UTCP supports various authentication methods:

from utcp_http.http_call_template import HttpCallTemplate
from utcp.data.auth_implementations.api_key_auth import ApiKeyAuth
from utcp.data.auth_implementations.basic_auth import BasicAuth
from utcp.data.auth_implementations.oauth2_auth import OAuth2Auth

# API Key authentication
call_template = HttpCallTemplate(
    name="authenticated_api",
    call_template_type="http",
    url="https://api.example.com/openapi.json",
    http_method="GET",
    auth=ApiKeyAuth(
        api_key="${API_KEY}",  # Use environment variable
        var_name="X-API-Key",
        location="header"
    )
)

# OAuth2 authentication
call_template = HttpCallTemplate(
    name="oauth_api",
    call_template_type="http",
    url="https://api.example.com/openapi.json",
    http_method="GET",
    auth=OAuth2Auth(
        token_url="https://api.example.com/oauth/token",
        client_id="${CLIENT_ID}",
        client_secret="${CLIENT_SECRET}",
        scope="read write"
    )
)

Supported Call Template Types

The adapters work with all UTCP call template types:

• HTTP/HTTPS APIs - Including automatic OpenAPI conversion
• Server-Sent Events (SSE) - For streaming data
• Streamable HTTP - For streaming HTTP responses
• Text-based Manuals - Direct UTCP manual definitions
• Model Context Protocol (MCP) - For interoperability

API Reference

Core Functions

from langchain_utcp_adapters import (
    load_utcp_tools,
    search_utcp_tools,
    convert_utcp_tool_to_langchain_tool,
    # Bedrock-specific utilities
    create_bedrock_tool_mapping,
    format_tool_name_for_bedrock,
    BedrockCompatibleTool,
    restore_original_tool_names
)

load_utcp_tools(utcp_client, call_template_name=None)

Load all tools from UTCP client and convert to LangChain format.

Parameters:

• utcp_client: UTCP client instance
• call_template_name: Optional call template name to filter tools

Returns: List of LangChain BaseTool instances

search_utcp_tools(utcp_client, query, call_template_name=None, max_results=None)

Search for tools and convert to LangChain format.

Parameters:

• utcp_client: UTCP client instance
• query: Search query string
• call_template_name: Optional call template name to filter
• max_results: Maximum number of results

Returns: List of relevant LangChain BaseTool instances

convert_utcp_tool_to_langchain_tool(utcp_client, tool)

Convert a single UTCP tool to LangChain format.

Parameters:

• utcp_client: UTCP client instance
• tool: UTCP Tool instance

Returns: LangChain BaseTool instance

Bedrock Utilities

create_bedrock_tool_mapping(tools)

Create Bedrock-compatible tools with name mapping for tools that don't meet Bedrock's naming requirements.

Parameters:

• tools: List of LangChain BaseTool instances

Returns: Tuple containing:

• List of Bedrock-compatible tools
• Dictionary mapping Bedrock names to original names

Examples

The examples/ directory contains comprehensive examples:

• basic_usage.py - ✅ Basic tool loading and usage (31 tools from Petstore + OpenLibrary)
• providers.py - ✅ Real-world call template examples (11 OpenLibrary tools)
• direct_usage.py - ✅ Direct UTCP client usage
• authentication.py - ✅ Authentication methods demonstration
• openapi.py - ✅ OpenAPI specification integration
• openai_langgraph.py - 🔑 LangGraph integration (requires OPENAI_API_KEY)
• openai_advanced.py - 🔑 Advanced LangGraph integration (requires OPENAI_API_KEY)
• bedrock_langgraph.py - 🔐 Simple Amazon Bedrock integration (requires AWS credentials)
• bedrock_advanced.py - 🔐 Comprehensive Amazon Bedrock integration (requires AWS credentials)

Legend:

• ✅ Works immediately without external dependencies
• 🔑 Requires API keys (OpenAI)
• 🔐 Requires AWS credentials and Bedrock access

Running Examples

# Basic examples (no external dependencies)
python examples/basic_usage.py
python examples/providers.py
python examples/authentication.py

# Examples requiring API keys
export OPENAI_API_KEY=your_key_here
python examples/openai_langgraph.py

# Bedrock examples (requires AWS credentials)
python examples/bedrock_langgraph.py

Development

Setup

# Clone the repository
git clone https://github.com/universal-tool-calling-protocol/langchain-utcp-adapters
cd langchain-utcp-adapters

# Using PDM (recommended)
pdm install -G all

# Or using pip
python -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate
pip install -e ".[all]"

Running Tests

# With PDM
pdm run pytest

# With pip
pytest

# Run with coverage
pytest tests/ --cov=langchain_utcp_adapters

Code Quality

# Format code
ruff format langchain_utcp_adapters/ tests/ examples/

# Lint code
ruff check langchain_utcp_adapters/ tests/ examples/

# Type checking
mypy langchain_utcp_adapters/

Requirements

• Python 3.10+
• LangChain Core 0.3.36+
• UTCP 1.0.0+
• Pydantic 2.0+

Contributing

Contributions are welcome! Please see CONTRIBUTING.md for guidelines.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Related Projects

• UTCP Python Client - The core UTCP implementation
• LangChain - Framework for developing applications with LLMs
• LangGraph - Library for building stateful, multi-actor applications