Introduction - ⚡ HasteKit

HasteKit SDK

A Golang SDK for developers who want fine-grained control over LLM interactions and agent orchestration. The HasteKit SDK abstracts away provider differences, letting you switch between OpenAI, Anthropic, Gemini and more with a single line change. Build agents, connect MCP tools, and get structured outputs—all through a unified API.

Core Capabilities

Multi-Provider Support

Access to multiple providers through a unified API. Seamlessly switch between OpenAI, Anthropic, Gemini, and more.

Agent SDK

Build sophisticated AI agents with dynamic system instructions, tools, conversation history, summarization, and multi-step reasoning.

Human-in-the-loop

Integrate human feedback into agent workflows for review and approval.

Durable Execution

Create durable agents that can pause, resume, and recover from failures.

Example

LLM Calls
Agents

Use the SDK as a lightweight wrapper to call any LLM provider. Simply change the Provider and Model to switch between providers—your application logic stays the same:

resp, _ := client.NewResponses(ctx, &responses.Request{
    Model: "OpenAI/gpt-4.1-mini", // or "Anthropic/claude-haiku-4-5" or "Gemini/gemini-2.5-flash"
    Instructions: utils.Ptr("You are a helpful assistant."),
    Input: responses.InputUnion{
        OfString: utils.Ptr("What is the capital of France?"),
    },
})

Create agents with tools, memory, and multi-step reasoning. Agents work the same way across all providers:

agent := client.NewAgent(&hastekit.AgentOptions{
    Name:        "Assistant",
    Instruction: client.Prompt("You are a helpful assistant."),
    LLM: client.NewLLM(hastekit.LLMOptions{
        Provider: llm.ProviderNameOpenAI,
        Model:    "gpt-4o-mini",
    }),
})

out, _ := agent.Execute(ctx, &agents.AgentInput{
    Messages: []responses.InputMessageUnion{
        responses.UserMessage("Hello!"),
    },
})

Get Started with the SDK →

Install the SDK and make your first LLM call in under 5 minutes.

SDK

LLM Gateway

Agents

​HasteKit SDK

​Core Capabilities