Lattice helps you build AI agents in Go with clean abstractions for LLMs, tool calling, retrieval-augmented memory, and multi-agent coordination. Focus on your domain logic while Lattice handles the orchestration plumbing.

Why Lattice?

Building production AI agents requires more than just LLM calls. You need:

• Pluggable LLM providers that swap without rewriting logic
• Tool calling that works across different model APIs
• Memory systems that remember context across conversations
• Multi-agent coordination for complex workflows
• Testing infrastructure that doesn't hit external APIs

Lattice provides all of this with idiomatic Go interfaces and minimal dependencies.

Features

• 🧩 Modular Architecture – Compose agents from reusable modules with declarative configuration
• 🤖 Multi-Agent Support – Coordinate specialist agents through a shared catalog and delegation system
• 🔧 Rich Tooling – Implement the Tool interface once, use everywhere automatically
• 🧠 Smart Memory – RAG-powered memory with importance scoring, MMR retrieval, and automatic pruning
• 🔌 Model Agnostic – Adapters for Gemini, Anthropic, Ollama, or bring your own
• 📡 UTCP Ready – First-class Universal Tool Calling Protocol support

Quick Start

Installation

git clone https://github.com/Protocol-Lattice/go-agent.git
cd lattice-agent
go mod download

Basic Usage

package main

import (
	"context"
	"flag"
	"log"

	"github.com/Protocol-Lattice/go-agent/src/adk"
	adkmodules "github.com/Protocol-Lattice/go-agent/src/adk/modules"
	"github.com/Protocol-Lattice/go-agent"
	"github.com/Protocol-Lattice/go-agent/src/subagents"

	"github.com/Protocol-Lattice/go-agent/src/memory"
	"github.com/Protocol-Lattice/go-agent/src/memory/engine"
	"github.com/Protocol-Lattice/go-agent/src/models"
	"github.com/Protocol-Lattice/go-agent/src/tools"
)

func main() {
	qdrantURL := flag.String("qdrant-url", "http://localhost:6333", "Qdrant base URL")
	qdrantCollection := flag.String("qdrant-collection", "adk_memories", "Qdrant collection name")
	flag.Parse()
	ctx := context.Background()

	// --- Shared runtime
	researcherModel, err := models.NewGeminiLLM(ctx, "gemini-2.5-pro", "Research summary:")
	if err != nil {
		log.Fatalf("create researcher model: %v", err)
	}
	memOpts := engine.DefaultOptions()

	adkAgent, err := adk.New(ctx,
		adk.WithDefaultSystemPrompt("You orchestrate a helpful assistant team."),
		adk.WithSubAgents(subagents.NewResearcher(researcherModel)),
		adk.WithModules(
			adkmodules.NewModelModule("gemini-model", func(_ context.Context) (models.Agent, error) {
				return models.NewGeminiLLM(ctx, "gemini-2.5-pro", "Swarm orchestration:")
			}),
			adkmodules.InQdrantMemory(100000, *qdrantURL, *qdrantCollection, memory.AutoEmbedder(), &memOpts),
			adkmodules.NewToolModule("essentials", adkmodules.StaticToolProvider([]agent.Tool{&tools.EchoTool{}}, nil)),
		),
	)
	if err != nil {
		log.Fatal(err)
	}

	agent, err := adkAgent.BuildAgent(ctx)
	if err != nil {
		log.Fatal(err)
	}

	// Use the agent
	resp, err := agent.Generate(ctx, "SessionID", "What is pgvector")
	if err != nil {
		log.Fatal(err)
	}

	log.Println(resp)
}

Running Examples

# Interactive CLI demo
go run cmd/demo/main.go

# Multi-agent coordination
go run cmd/team/main.go

# Quick start example
go run cmd/quickstart/main.go

Project Structure

lattice-agent/
├── cmd/
│   ├── demo/          # Interactive CLI with tools, delegation, and memory
│   ├── quickstart/    # Minimal getting-started example
│   └── team/          # Multi-agent coordination demos
├── pkg/
│   ├── adk/           # Agent Development Kit and module system
│   ├── memory/        # Memory engine and vector store adapters
│   ├── models/        # LLM provider adapters (Gemini, Ollama, Anthropic)
│   ├── subagents/     # Pre-built specialist agent personas
├── └── tools/         # Built-in tools (echo, calculator, time, etc.)

Configuration

Environment Variables

Variable	Description	Required
GOOGLE_API_KEY	Gemini API credentials	For Gemini models
GEMINI_API_KEY	Alternative to GOOGLE_API_KEY	For Gemini models
DATABASE_URL	PostgreSQL connection string	For persistent memory
ADK_EMBED_PROVIDER	Embedding provider override	No (defaults to Gemini)

Example Configuration

export GOOGLE_API_KEY="your-api-key-here"
export DATABASE_URL="postgres://user:pass@localhost:5432/lattice?sslmode=disable"
export ADK_EMBED_PROVIDER="gemini"

Core Concepts

Memory Engine

Lattice includes a sophisticated memory system with retrieval-augmented generation (RAG):

store := memory.NewInMemoryStore() // or PostgreSQL/Qdrant
engine := memory.NewEngine(store, memory.Options{}).
    WithEmbedder(yourEmbedder)

sessionMemory := memory.NewSessionMemory(
    memory.NewMemoryBankWithStore(store), 
    8, // context window size
).WithEngine(engine)

Features:

• Importance Scoring – Automatically weights memories by relevance
• MMR Retrieval – Maximal Marginal Relevance for diverse results
• Auto-Pruning – Removes stale or low-value memories
• Multiple Backends – In-memory, PostgreSQL+pgvector,mongodb, neo4j or Qdrant

Tool System

Create custom tools by implementing a simple interface:

package tools

import (
        "context"
        "fmt"
        "strings"

        "github.com/Protocol-Lattice/go-agent"
)

// EchoTool repeats the provided input. Useful for testing tool wiring.
type EchoTool struct{}

func (e *EchoTool) Spec() agent.ToolSpec {
        return agent.ToolSpec{
                Name:        "echo",
                Description: "Echoes the provided text back to the caller.",
                InputSchema: map[string]any{
                        "type": "object",
                        "properties": map[string]any{
                                "input": map[string]any{
                                        "type":        "string",
                                        "description": "Text to echo back.",
                                },
                        },
                        "required": []any{"input"},
                },
        }
}

func (e *EchoTool) Invoke(_ context.Context, req agent.ToolRequest) (agent.ToolResponse, error) {
        raw := req.Arguments["input"]
        if raw == nil {
                return agent.ToolResponse{Content: ""}, nil
        }
        return agent.ToolResponse{Content: strings.TrimSpace(fmt.Sprint(raw))}, nil
}

Register tools with the module system and they're automatically available to all agents.

Multi-Agent Coordination

Use Shared Spaces to coordinate multiple agents with shared memory

Perfect for:

• Team-based workflows where agents need shared context
• Complex tasks requiring specialist coordination
• Projects with explicit access control requirements

Development

Running Tests

# Run all tests
go test ./...

# Run with coverage
go test -cover ./...

# Run specific package tests
go test ./pkg/memory/...

Code Style

We follow standard Go conventions:

• Use gofmt for formatting
• Follow Effective Go guidelines
• Add tests for new features
• Update documentation when adding capabilities

Adding New Components

New LLM Provider:

1. Implement the models.LLM interface in pkg/models/
2. Add provider-specific configuration
3. Update documentation and examples

New Tool:

1. Implement agent.Tool interface in pkg/tools/
2. Register with the tool module system
3. Add tests and usage examples

New Memory Backend:

1. Implement memory.VectorStore interface
2. Add migration scripts if needed
3. Update configuration documentation

Prerequisites

• Go 1.22+ (1.25 recommended)
• PostgreSQL 15+ with pgvector extension (optional, for persistent memory)
• API Keys for your chosen LLM provider

PostgreSQL Setup (Optional)

For persistent memory with vector search:

CREATE EXTENSION IF NOT EXISTS vector;

The memory module handles schema migrations automatically.

Troubleshooting

Common Issues

Missing pgvector extension

ERROR: type "vector" does not exist

Solution: Run CREATE EXTENSION vector; in your PostgreSQL database.

API key errors

ERROR: authentication failed

Solution: Verify your API key is correctly set in the environment where you run the application.

Tool not found

ERROR: tool "xyz" not registered

Solution: Ensure tool names are unique and properly registered in your tool catalog.

Getting Help

• Check existing GitHub Issues
• Review the examples for common patterns
• Join discussions in GitHub Discussions

Contributing

We welcome contributions! Here's how to get started:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Make your changes with tests
4. Update documentation
5. Submit a pull request

Please ensure:

• Tests pass (go test ./...)
• Code is formatted (gofmt)
• Documentation is updated
• Commit messages are clear

License

This project is licensed under the Apache 2.0 License.

Acknowledgments

• Inspired by Google's Agent Development Kit (Python)

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Star us on GitHub if you find Lattice useful! ⭐