go-utcp

Official Go implementation of the UTCP

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The Universal Tool Calling Protocol (UTCP) is a modern, flexible, and scalable standard for defining and interacting with tools across various communication protocols. It emphasizes scalability, interoperability, and ease of use. It provides built-in transports for HTTP, CLI, Server-Sent Events, streaming HTTP, GraphQL, MCP, and UDP. Users can use the library to construct a client and call tools using the available transports. The library also includes utilities for variable substitution, in-memory repository for storing providers and tools, and OpenAPI conversion to UTCP manuals.

README:

go-utcp

Introduction

The Universal Tool Calling Protocol (UTCP) is a modern, flexible, and scalable standard for defining and interacting with tools across a wide variety of communication protocols. It is designed to be easy to use, interoperable, and extensible, making it a powerful choice for building and consuming tool-based services.

In contrast to other protocols like MCP, UTCP places a strong emphasis on:

Scalability: UTCP is designed to handle a large number of tools and providers without compromising performance.
Interoperability: With support for a wide range of provider types (including HTTP, WebSockets, gRPC, and even CLI tools), UTCP can integrate with almost any existing service or infrastructure.
Ease of Use: The protocol is built on simple.

Features

Built-in transports for HTTP, CLI, Server-Sent Events, streaming HTTP, GraphQL, MCP and UDP.
Variable substitution via environment variables or .env files using UtcpDotEnv.
In-memory repository for storing providers and tools discovered at runtime.
Utilities such as OpenApiConverter to convert OpenAPI definitions into UTCP manuals.
Example programs demonstrating the client in the examples directory.

Examples

Each subdirectory under examples/ is a standalone Go module demonstrating a client or transport. For an overview of available examples and usage instructions, see examples/README.md. When building or running an example from this repository, disable the workspace to ensure Go uses the module's own go.mod:

GOWORK=off go run ./examples/cli_transport

Getting Started

Add the library to your project with:

go get github.com/universal-tool-calling-protocol/go-utcp@latest

You can then construct a client and call tools using any of the built-in transports. The library ships transports for HTTP, Server-Sent Events, streaming HTTP, CLI, WebSocket, gRPC, GraphQL, TCP, UDP, WebRTC and MCP providers.

package main

import (
	"context"
	"fmt"
	"os"
	"time"

	utcp "github.com/universal-tool-calling-protocol/go-utcp"
)

func main() {
	ctx := context.Background()

	cfg := &utcp.UtcpClientConfig{
		ProvidersFilePath: "providers.json",
	}

	fmt.Println("Creating UTCP client...")
	client, err := utcp.NewUTCPClient(ctx, cfg, nil, nil)
	if err != nil {
		fmt.Fprintf(os.Stderr, "failed to create UTCP client: %v\n", err)
		os.Exit(1)
	}

	// Give the client time to fully initialize
	fmt.Println("Waiting for initialization...")
	time.Sleep(500 * time.Millisecond)

	fmt.Println("\n=== Tool Discovery ===")
	tools, err := client.SearchTools("", 10)
	if err != nil {
		fmt.Fprintf(os.Stderr, "search error: %v\n", err)
		os.Exit(1)
	}

	if len(tools) == 0 {
		fmt.Println("No tools found!")
		os.Exit(1)
	}

	tool := tools[0]
	fmt.Printf("Found tool: %s\n", tool.Name)
	fmt.Printf("Tool description: %s\n", tool.Description)

	// Test the tool call
	fmt.Println("\n=== Tool Call Test ===")
	input := map[string]interface{}{
		"name": "Kamil",
	}

	fmt.Printf("Calling tool '%s' with input: %v\n", tool.Name, input)
	result, err := client.CallTool(ctx, tool.Name, input)
	if err != nil {
		fmt.Printf("ERROR: %v\n", err)

		// Try to understand the error better
		fmt.Printf("Error type: %T\n", err)
		fmt.Printf("Error string: %s\n", err.Error())

		// Let's try a direct search for the provider
		fmt.Println("\n=== Searching for provider directly ===")
		providerTools, err2 := client.SearchTools("hello", 10)
		if err2 != nil {
			fmt.Printf("Provider search failed: %v\n", err2)
		} else {
			fmt.Printf("Provider search returned %d tools\n", len(providerTools))
			for i, t := range providerTools {
				fmt.Printf("  %d: %s\n", i, t.Name)
			}
		}

	} else {
		fmt.Printf("SUCCESS: %v\n", result)
	}
}

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