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Agent handoff enables a one agent to delegate tasks to others agents based on the user’s request. This pattern is useful for building multi-agent systems where different agents have specific capabilities, and a central agent routes requests to the appropriate specialist.

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Overview

Handoffs allow you to:
  • Route requests: A router agent analyzes user input and delegates to the right specialist
  • Specialize agents: Create focused agents for specific tasks (jokes, facts, code, etc.)
  • Share conversation context: Handoff agents can share conversation history for continuity
  • Build hierarchical systems: Combine multiple specialists under one entry point
Unlike Agent as a Tool where the parent agent calls sub-agents as tools and continues processing, handoffs transfer control entirely to the target agent, which then responds directly to the user.

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Creating a Handoff

To create a handoff, use agents.NewHandoff() with the target agent: 
import (
    "github.com/hastekit/hastekit-sdk-go/pkg/agents"
)

// Create a specialized agent
jokeAgent := client.NewAgent(&hastekit.AgentOptions{
    Name:        "JokeAgent",
    Instruction: client.Prompt("You are a joke teller"),
    LLM:         model,
    History:     client.NewConversationManager(),
})

// Create a handoff to this agent
handoff := agents.NewHandoff(
    jokeAgent.Name,                           // Name (used for routing)
    "Use this agent to generate jokes",       // Description (helps router decide)
    jokeAgent,                                // Target agent
)

​
NewHandoff Parameters

ParameterTypeDescription
namestringName of the handoff (typically matches the agent name)
descstringDescription that helps the router agent decide when to use this handoff
agent*AgentThe target agent that will handle the request

​
Using Handoffs with a Router Agent

Handoffs are configured on the router agent using the Handoffs field in AgentOptions: 
routerAgent := client.NewAgent(&hastekit.AgentOptions{
    Name:        "RouterAgent",
    Instruction: client.Prompt("You are a router agent. You must not respond directly. Your role is only to delegate to other agents"),
    LLM:         model,
    Handoffs: []*agents.Handoff{
        agents.NewHandoff(jokeAgent.Name, "Use this agent to generate jokes", jokeAgent),
        agents.NewHandoff(factAgent.Name, "Use this agent to generate facts", factAgent),
    },
    History: client.NewConversationManager(),
})
The router agent uses the handoff descriptions to determine which agent should handle each request. Write clear, specific descriptions to help the router make accurate routing decisions.

​
Complete Example

Here’s a complete example demonstrating a router agent that delegates to specialized joke and fact agents: 
package main

import (
    "log"
    "net/http"
    "os"

    hastekit "github.com/hastekit/hastekit-sdk-go"
    "github.com/hastekit/hastekit-sdk-go/pkg/agents"
    "github.com/hastekit/hastekit-sdk-go/pkg/gateway"
    "github.com/hastekit/hastekit-sdk-go/pkg/gateway/llm"
)

func main() {
    // Initialize SDK client with required services
    client, err := hastekit.New(&hastekit.ClientOptions{
        ProviderConfigs: []gateway.ProviderConfig{
            {
                ProviderName: llm.ProviderNameOpenAI,
                ApiKeys: []*gateway.APIKeyConfig{
                    {
                        Name:   "Key 1",
                        APIKey: os.Getenv("OPENAI_API_KEY"),
                    },
                },
            },
        },
    })
    if err != nil {
        log.Fatal(err)
    }

    // Create LLM model
    model := client.NewLLM(hastekit.LLMOptions{
        Provider: llm.ProviderNameOpenAI,
        Model:    "gpt-4.1-mini",
    })

    // Create specialized agents
    jokeAgent := client.NewAgent(&hastekit.AgentOptions{
        Name:        "JokeAgent",
        Instruction: client.Prompt("You are a joke teller"),
        LLM:         model,
        History:     client.NewConversationManager(),
    })

    factAgent := client.NewAgent(&hastekit.AgentOptions{
        Name:        "FactAgent",
        Instruction: client.Prompt("You are a fact teller"),
        LLM:         model,
        History:     client.NewConversationManager(),
    })

    // Create router agent with handoffs
    _ = client.NewAgent(&hastekit.AgentOptions{
        Name:        "RouterAgent",
        Instruction: client.Prompt("You are a router agent. You must not respond directly. Your role is only to delegate to other agents"),
        LLM:         model,
        Handoffs: []*agents.Handoff{
            agents.NewHandoff(jokeAgent.Name, "Use this agent to generate jokes", jokeAgent),
            agents.NewHandoff(factAgent.Name, "Use this agent to generate facts", factAgent),
        },
        History: client.NewConversationManager(),
    })

    // Serve the agents
    err = http.ListenAndServe(":8070", client)
    if err != nil {
        log.Fatal(err)
    }
}