Laddr

A transparent, Docker-native, observable, distributed agent framework.

Laddr is a superset of CrewAI that removes excessive abstractions and introduces real distributed runtime, local observability, and explicit agent communication.

🎯 Philosophy

CrewAI is too abstract, making it nearly impossible to understand or debug what's happening under the hood.

Laddr fixes this by being:

• Transparent — All logic (task flow, prompts, tool calls) visible and traceable
• Pluggable — Configure your own queues, databases, models, or tools
• Observable — Every agent action recorded via OpenTelemetry
• Containerized — Everything runs inside Docker for predictable behavior

In short: Laddr = CrewAI with explicit communication, Docker-native execution, local observability, and zero hidden magic.

🏗️ Architecture

Communication Model

Unlike CrewAI's internal synchronous calls, Laddr uses Redis Streams for explicit message passing:

Controller → Redis Queue → Agent Worker → Redis Response Stream

Each agent runs in its own container and consumes tasks from a dedicated Redis stream.

Services

• PostgreSQL (with pgvector) — Stores traces, job history, agent metadata
• Redis — Message bus for task distribution
• MinIO — S3-compatible storage for artifacts and large payloads
• Jaeger — OpenTelemetry trace collection and visualization
• Prometheus — Metrics collection and monitoring
• API Server — FastAPI server for job submission and queries
• Worker Containers — One per agent, consumes and processes tasks
• Dashboard — Real-time monitoring and agent interaction

🚀 Quick Start

Installation

# Clone the repository
cd lib/laddr

# Install locally (for now)
pip install -e .

Create a Project

# Initialize a new project
laddr init my_project

# Navigate to project
cd my_project

# Configure API keys in .env
# Edit .env and add your GEMINI_API_KEY and SERPER_API_KEY

# Start the environment (includes default researcher agent)
laddr run dev

This will start all services with a working researcher agent and web_search tool ready to use.

What's included out-of-the-box:

• Default researcher agent with Gemini 2.0 Flash
• web_search tool powered by Serper.dev
• Sample research_pipeline.yml
• Full observability stack (Jaeger, Prometheus, Dashboard)

Access the dashboard at http://localhost:5173 to interact with your agents.

📦 Project Structure

my_project/
├── laddr.yml              # Project configuration
├── docker-compose.yml       # Docker services (auto-generated)
├── Dockerfile               # Container definition
├── .env                     # Environment variables
├── agents/                  # Agent configurations
│   ├── summarizer/
│   │   └── agent.yml
│   └── analyzer/
│       └── agent.yml
├── tools/                   # Custom tools
│   └── my_tool.py
└── pipelines/               # Pipeline definitions
    └── analysis_pipeline.yml

🤖 Creating Agents

Add an Agent

laddr add agent researcher

This will:

1. Create agents/researcher/agent.yml
2. Add worker service to docker-compose.yml
3. Register agent in laddr.yml

Note: A default researcher agent with web_search tool is created automatically when you run laddr init.

Agent Configuration

agents/researcher/agent.yml:

name: researcher
role: Research Agent
goal: Research topics on the web and summarize findings concisely
backstory: A helpful researcher that gathers and condenses information from reliable web sources
llm:
  provider: gemini
  model: gemini-2.5-flash
  api_key: ${GEMINI_API_KEY}
  temperature: 0.7
  max_tokens: 2048
tools:
  - web_search
max_iterations: 15
allow_delegation: false
verbose: true

LLM Providers

Laddr supports multiple LLM providers:

• Gemini (default) - Google's Gemini models
• OpenAI - GPT-4, GPT-3.5, etc.
• Anthropic - Claude models
• Groq - Fast inference
• Ollama - Local models
• llama.cpp - Local C++ inference

Set your API keys in .env:

GEMINI_API_KEY=your_key_here
OPENAI_API_KEY=your_key_here
ANTHROPIC_API_KEY=your_key_here
GROQ_API_KEY=your_key_here

🔧 Custom Tools

Default Tool: web_search

A web_search tool using Serper.dev is included by default:

# tools/web_search.py
def web_search(query: str, max_results: int = 5) -> str:
    """Search the web using Serper.dev API."""
    # Uses SERPER_API_KEY from .env
    # Get your free API key at https://serper.dev

Setup: Add your Serper.dev API key to .env:

SERPER_API_KEY=your_serper_key_here

Add More Tools

laddr add tool my_custom_tool

Edit tools/my_custom_tool.py:

def my_custom_tool(param: str) -> str:
    """Your custom tool logic."""
    return result

📋 Pipelines

A sample pipeline (research_pipeline.yml) is created automatically on init.

Example Pipeline

pipelines/research_pipeline.yml:

name: research_pipeline
description: Example research pipeline using the researcher agent
tasks:
  - name: search_topic
    description: "Search the web for information about: {topic}"
    agent: researcher
    expected_output: A comprehensive summary of web search results
    tools:
      - web_search
    async_execution: false
    
  - name: analyze_results
    description: Analyze the search results and extract key insights
    agent: researcher
    expected_output: Key insights and recommendations based on the research
    context:
      - search_topic
    async_execution: false

Run a Pipeline

laddr run pipeline pipelines/analysis.yml

Note: Pipeline inputs are defined in the YAML file or can be passed via API.

🔍 Observability

View Traces

Navigate to Jaeger at http://localhost:16686 to see:

• Task execution traces
• LLM API calls
• Tool invocations
• Error spans

View Metrics

Navigate to Prometheus at http://localhost:9090 to query:

• laddr_agent_task_duration_seconds — Task execution time
• laddr_queue_depth — Pending tasks per agent
• laddr_tokens_total — Token usage
• laddr_errors_total — Error counts

Agent Logs

# View logs for an agent
laddr logs summarizer

# Follow logs in real-time
laddr logs summarizer -f

🌐 API Reference

Submit Job

curl -X POST http://localhost:8000/jobs \
  -H "Content-Type: application/json" \
  -d '{
    "pipeline_name": "analysis",
    "inputs": {"document": "report.pdf"}
  }'

Get Job Status

curl http://localhost:8000/jobs/{job_id}

List Agents

curl http://localhost:8000/agents

📊 Dashboard

Access the dashboard at http://localhost:5173 to:

• View all active agents
• Monitor real-time logs
• Inspect OpenTelemetry traces
• Interact with individual agents
• Visualize job workflows
• Check system health metrics

🐳 Docker Commands

# Start all services
laddr run dev

# View logs
laddr logs <agent_name>

# Stop all services
laddr stop

# Rebuild containers
docker compose up -d --build

⚙️ Configuration

Environment Variables

Edit .env to customize:

DATABASE_URL=postgresql://postgres:postgres@postgres:5432/laddr
REDIS_URL=redis://redis:6379
MINIO_ENDPOINT=minio:9000
OTEL_EXPORTER_OTLP_ENDPOINT=http://jaeger:4318
API_HOST=0.0.0.0
API_PORT=8000

Project Configuration

Edit laddr.yml:

project:
  name: my_project
  broker: redis
  database: postgres
  storage: minio
  tracing: true
  metrics: true
  agents:
    - summarizer
    - analyzer

🔄 Message Format

Task Message

{
  "task_id": "uuid",
  "job_id": "uuid",
  "source_agent": "controller",
  "target_agent": "summarizer",
  "payload": {
    "description": "Summarize this document",
    "context": "...",
    "expected_output": "..."
  },
  "trace_parent": "trace-id",
  "created_at": "timestamp"
}

Response Message

{
  "task_id": "uuid",
  "job_id": "uuid",
  "agent_name": "summarizer",
  "status": "completed",
  "result": {"output": "..."},
  "metrics": {
    "tokens": 2200,
    "latency_ms": 5200
  },
  "trace_parent": "trace-id",
  "completed_at": "timestamp"
}

🔧 Development

Prerequisites

• Python 3.10+
• Docker & Docker Compose
• Git

Setup

# Clone repository
git clone https://github.com/laddr/laddr.git
cd laddr

# Install dependencies
cd lib/laddr
pip install -e .[dev]

# Run tests
pytest

📝 CLI Reference

laddr init [project_name]        # Initialize new project
laddr add agent <name>           # Add new agent
laddr add tool <name>            # Add custom tool
laddr run dev                      # Start development environment
laddr run agent <agent>            # Run single agent locally
laddr run pipeline <file.yml>      # Run a pipeline
laddr logs <agent>                 # View agent logs
laddr stop                       # Stop all services

🆚 Laddr vs CrewAI

🤝 Contributing

Contributions are welcome! Please see CONTRIBUTING.md for guidelines.

📄 License

MIT License - see LICENSE for details.

🔗 Links

• Documentation: Coming soon
• GitHub: https://github.com/laddr/laddr
• Issues: https://github.com/laddr/laddr/issues

Built with transparency in mind. No hidden magic. Just distributed agents.