ABK (Agent Builder Kit)

Modular utilities for building LLM agents

ABK is a feature-gated Rust crate providing essential utilities for building LLM-based agents. Choose only the components you need via Cargo features.

ABK (Agent Builder Kit)

Complete modular agent building blocks with feature-gated modules

ABK is a comprehensive Rust crate providing feature-gated modules for building LLM-based agents. Choose only the components you need via Cargo features to keep your builds lean and focused.

Features

ABK provides feature-gated modules organized by functionality:

Core Features

• config - TOML configuration loading and environment variable resolution
• observability - Structured logging with file/console output
• checkpoint - Session persistence and resume capabilities

Execution Features

• executor - Command execution with timeout and validation
• orchestration - Workflow coordination and session management
• lifecycle - WASM lifecycle plugin integration

High-Level Features

• cli - Command-line interface utilities and formatting with convenience functions
• provider - LLM provider abstraction with WASM support
• agent - Complete agent implementation with all dependencies

Composite Features

• all - Enables all features for complete functionality

Installation

Add to your Cargo.toml:

[dependencies]
# Enable only the features you need:
abk = { version = "0.1.24", features = ["config"] }

# Or enable multiple features:
abk = { version = "0.1.24", features = ["config", "observability", "executor"] }

# Or enable everything:
abk = { version = "0.1.24", features = ["all"] }

Usage

Configuration Feature

use abk::config::{ConfigurationLoader, EnvironmentLoader};
use std::path::Path;

// Load environment variables
let env = EnvironmentLoader::new(None);

// Load configuration from TOML
let config_loader = ConfigurationLoader::new(
    Some(Path::new("config/simpaticoder.toml"))
).unwrap();
let config = &config_loader.config;

// Access configuration
println!("Max iterations: {}", config.execution.max_iterations);
println!("LLM provider: {:?}", env.llm_provider());

Observability Feature

use abk::observability::Logger;
use std::collections::HashMap;

// Create a logger with custom path and log level
let logger = Logger::new(
    Some(Path::new("logs/agent.md")),
    Some("DEBUG")
).unwrap();

// Log session lifecycle
let config = HashMap::new();
logger.log_session_start("auto", &config).unwrap();

// Log LLM interactions
let messages = vec![];
logger.log_llm_interaction(&messages, "Response text", "gpt-4").unwrap();

// Log completion
logger.log_completion("Task completed successfully").unwrap();

CLI Feature

use abk::cli::{run_from_config_path, CommandContext};

// Option 1: One-liner convenience function (recommended for simple apps)
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    run_from_config_path("config/agent.toml", None).await
}

// Option 2: Full customization with CommandContext trait
struct MyContext { /* custom implementation */ }
impl CommandContext for MyContext { /* implement all methods */ }

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let context = MyContext::new();
    let cli_config = CliConfig::from_simpaticoder_config(&context.config);
    run_configured_cli(&context, &cli_config).await
}

Provider Feature

use abk::checkpoint::{get_storage_manager, CheckpointResult};

// Initialize checkpoint storage
let manager = get_storage_manager()?;
let project_path = Path::new(".");
let project_storage = manager.get_project_storage(project_path).await?;

// Create a new session
let session_storage = project_storage.create_session("my-task").await?;

Provider Feature

use abk::provider::ProviderFactory;

// Create LLM provider from environment
let provider = ProviderFactory::create(&env)?;

// Generate text
let config = GenerateConfig {
    max_tokens: 100,
    temperature: 0.7,
    ..Default::default()
};
let response = provider.generate(&messages, &config).await?;

Agent Feature

use abk::agent::Agent;

// Create a complete agent
let mut agent = Agent::new(
    Some(Path::new("config.toml")),
    Some(Path::new(".env")),
    Some(AgentMode::Confirm)
)?;

// Agent has access to all features:
// - Configuration via agent.config
// - Executor via agent.executor
// - Logger via agent.logger
// - Provider via agent.provider
// - Checkpoint manager via agent.session_manager

Roadmap

ABK has evolved from a simple configuration utility to a comprehensive Agent Builder Kit:

• ✅ Phase 1: config feature (v0.1.0 - configuration management)
• ✅ Phase 2: observability feature (v0.1.1 - logging and metrics)
• ✅ Phase 3: checkpoint feature (v0.1.2 - session persistence)
• ✅ Phase 4: provider feature (v0.1.3+ - LLM provider abstraction)
• ✅ Phase 5: executor feature (v0.1.23 - command execution)
• ✅ Phase 6: orchestration feature (v0.1.23 - workflow management)
• ✅ Phase 7: lifecycle feature (v0.1.23 - WASM plugin integration)
• ✅ Phase 8: cli feature (v0.1.23 - command-line utilities)
• ✅ Phase 9: agent feature (v0.1.23 - complete agent implementation)

Why ABK?

ABK provides a unified, modular foundation for building LLM agents:

🏗️ Modular Architecture

• Feature-gated modules: Only compile what you need
• Clean separation: Each feature has focused responsibilities
• Composable design: Mix and match components as needed

📦 Unified Package

Instead of maintaining separate crates for each component, ABK unifies them under one package with feature flags:

• Unified versioning - One version number for all infrastructure utilities
• Simplified dependencies - Import one crate instead of nine
• Coordinated releases - Breaking changes managed together

🚀 Production Ready

• Comprehensive testing - Extensive test coverage for all features
• Error handling - Robust error types and recovery mechanisms
• Performance optimized - Efficient implementations with async support
• Well documented - Complete API documentation and examples

🔧 Developer Experience

• Type safety - Strongly typed APIs with compile-time guarantees
• Intuitive APIs - Easy-to-use interfaces following Rust conventions
• Extensible design - Easy to add new features and providers

License

Dual-licensed under MIT OR Apache-2.0