Architecture Overview

This page provides a technical overview of the FAOS platform architecture for developers and technical decision-makers.

High-Level Architecture

┌─────────────────────────────────────────────────────────────────┐
│                        FAOS Platform                            │
├─────────────────────────────────────────────────────────────────┤
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────┐             │
│  │   Web UI    │  │  Mobile App │  │   CLI/SDK   │  Clients    │
│  └──────┬──────┘  └──────┬──────┘  └──────┬──────┘             │
│         │                │                │                     │
│  ┌──────▼────────────────▼────────────────▼──────┐             │
│  │              API Gateway (Kong)               │  Edge       │
│  └──────────────────────┬────────────────────────┘             │
│                         │                                       │
│  ┌──────────────────────▼────────────────────────┐             │
│  │           Core Services (Microservices)        │             │
│  │  ┌─────────┐ ┌─────────┐ ┌─────────┐          │  Services   │
│  │  │  Agent  │ │Workflow │ │ Memory  │          │             │
│  │  │ Engine  │ │ Engine  │ │  Store  │  ...     │             │
│  │  └─────────┘ └─────────┘ └─────────┘          │             │
│  └──────────────────────┬────────────────────────┘             │
│                         │                                       │
│  ┌──────────────────────▼────────────────────────┐             │
│  │              Data Layer                        │             │
│  │  ┌─────────┐ ┌─────────┐ ┌─────────┐          │  Data       │
│  │  │PostgreSQL│ │  Redis  │ │  S3     │          │             │
│  │  └─────────┘ └─────────┘ └─────────┘          │             │
│  └───────────────────────────────────────────────┘             │
└─────────────────────────────────────────────────────────────────┘

Technology Stack

FAOS is built on a 100% open-source stack (MIT/Apache 2.0 licenses):

Layer	Technology	License
Frontend	React, Tailwind CSS, AG-UI	MIT
API Gateway	Kong	Apache 2.0
Backend	Node.js, Python	MIT
Database	PostgreSQL	PostgreSQL License
Cache	Redis	BSD
Message Queue	RabbitMQ	MPL 2.0
Container	Docker, Kubernetes	Apache 2.0
Observability	OpenTelemetry, Grafana	Apache 2.0

Core Components

Agent Engine

The Agent Engine is the brain of FAOS, responsible for:

• LLM orchestration (Claude, GPT, local models)
• Tool execution
• Memory management
• Guardrail enforcement

interface AgentEngine {
  // Process a user request
  process(request: AgentRequest): Promise<AgentResponse>;

  // Execute a tool action
  executeTool(tool: string, params: object): Promise<ToolResult>;

  // Check guardrails
  checkGuardrails(action: Action): GuardrailResult;
}

Workflow Engine

Manages the execution of multi-step workflows:

• DAG-based workflow definitions
• Parallel and sequential execution
• Retry and error handling
• State persistence

Memory Store

Provides persistent memory for agents:

• Vector embeddings for semantic search
• Entity relationship graphs
• Conversation history
• Cross-agent knowledge sharing

Event Bus

Enables real-time communication:

• Agent-to-agent messaging
• User notification delivery
• Integration webhooks
• Audit logging

Deployment Models

Cloud (Managed)

Fully managed SaaS deployment:

• Multi-tenant architecture
• Automatic scaling
• Zero maintenance

Self-Hosted

Deploy on your infrastructure:

• Single-tenant isolation
• Data sovereignty compliance
• Custom security policies

Hybrid

Best of both worlds:

• Control plane in cloud
• Data plane on-premises
• Secure tunnel connectivity

Security Architecture

Multi-Tenant Isolation

┌─────────────────────────────────────┐
│           Tenant A                  │
│  ┌─────────┐  ┌─────────┐          │
│  │  Data   │  │  Agents │          │
│  └─────────┘  └─────────┘          │
├─────────────────────────────────────┤ ← Network Isolation
│           Tenant B                  │
│  ┌─────────┐  ┌─────────┐          │
│  │  Data   │  │  Agents │          │
│  └─────────┘  └─────────┘          │
└─────────────────────────────────────┘

Security Features

• Authentication: OAuth 2.0, SAML, OIDC
• Authorization: RBAC with fine-grained permissions
• Encryption: TLS 1.3, AES-256 at rest
• Audit: Complete action logging
• Compliance: SOC 2, GDPR, HIPAA ready

Scalability

FAOS is designed for enterprise scale:

Metric	Capacity
Concurrent Agents	10,000+
Requests/Second	50,000+
Message Latency	< 100ms p99
Data Retention	Unlimited

Integration Architecture

MCP (Model Context Protocol)

FAOS uses Anthropic's MCP for standardized tool integration:

// MCP Server Example
const server = new MCPServer({
  name: "my-integration",
  tools: [
    {
      name: "search_crm",
      description: "Search CRM records",
      inputSchema: { /* JSON Schema */ },
      handler: async (input) => { /* Implementation */ }
    }
  ]
});

Webhooks

Receive real-time events:

{
  "event": "agent.action.completed",
  "timestamp": "2025-01-15T10:30:00Z",
  "data": {
    "agentId": "agent_abc123",
    "action": "send_email",
    "result": "success"
  }
}

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Next Steps

• API Reference - Detailed API documentation
• Enterprise Setup - Self-hosted deployment
• Security Guide - Security configuration