🎯 What is Phlow?

Phlow is authentication middleware for AI agents that's evolving into the Agent Marketplace Platform - enabling agents to discover, authenticate, and monetize their capabilities.

Current: A2A Protocol + Supabase • JWT Auth • Middleware Vision: The "App Store for AI Agents"

🌟 Our Evolution Path

Phase 1: Authentication Middleware (Current)
   ↓
Phase 2: Agent Discovery & Registry
   ↓
Phase 3: Agent Marketplace Platform

We're building the foundational trust layer that will enable agents to securely discover, interact with, and monetize their capabilities - creating the first true marketplace for AI agent services.

⚡ Quick Start

pip install phlow

Python Example

from phlow import PhlowMiddleware, AgentCard, PhlowConfig

config = PhlowConfig(
    agent_card=AgentCard(
        name="My Agent",
        description="Agent description",
        service_url="https://my-agent.com",
        skills=["chat", "analysis"],
        metadata={"agent_id": "my-agent-id", "public_key": "public-key-here"}
    ),
    private_key=os.environ["PRIVATE_KEY"],
    supabase_url=os.environ["SUPABASE_URL"],
    supabase_anon_key=os.environ["SUPABASE_ANON_KEY"]
)

phlow = PhlowMiddleware(config)

FastAPI Middleware

# Use A2A authentication with Supabase features
@app.post("/api/chat")
async def chat_endpoint(context: PhlowContext = Depends(auth_required)):
    # Access agent info and Supabase client
    agent = context.agent
    return {"message": f"Hello from {agent.name}"}

Full Setup Guide →

🚀 Features

• 🔐 JWT Authentication - Verify A2A Protocol JWT tokens
• 📋 Agent Storage - Store and retrieve agent cards in Supabase
• 🛡️ RLS Helpers - Generate basic Supabase Row Level Security policies
• 📊 Basic Audit - Log authentication events to Supabase
• 🌐 Python Package - Pure Python implementation
• 🔧 FastAPI Integration - Complete middleware with dependency injection

How It Works

sequenceDiagram
    participant A as Agent A
    participant B as Agent B
    participant S as Supabase Registry

    A->>A: Generate JWT with private key
    A->>B: Send request + JWT + Agent ID header
    B->>S: Lookup Agent A's public key
    S->>B: Return AgentCard with public key
    B->>B: Verify JWT signature
    B->>A: Return response

📦 What's Included

phlow/
├── src/phlow/              # Python authentication library
├── tests/                  # Test suite
├── examples/               # Example implementations
└── docs/                   # Documentation
    ├── getting-started.md      # Quick setup guide
    ├── a2a-compatibility.md    # A2A Protocol integration
    └── api-reference.md        # API documentation

🏗️ How It Works

Phlow is a lightweight middleware that connects A2A Protocol JWT authentication with Supabase storage:

1. JWT Verification - Validates A2A Protocol tokens
2. Agent Lookup - Retrieves agent cards from Supabase
3. Context Creation - Provides agent info and Supabase client to your app
4. Basic Logging - Optionally logs auth events

See Getting Started for setup instructions.

🔧 Setup

1. Install: pip install phlow
2. Configure: Set up Supabase project and environment variables
3. Initialize: Register your agent card in Supabase
4. Authenticate: Add Phlow middleware to your A2A agent

Detailed Setup Instructions →

💡 Example: A2A Agent with Phlow Auth

# A2A + Phlow Integration
from phlow import PhlowMiddleware, AgentCard, PhlowConfig

config = PhlowConfig(
    agent_card=AgentCard(
        name="My Agent",
        description="A2A-compatible agent",
        service_url="https://my-agent.com",
        skills=["chat", "analysis"],
        metadata={"agent_id": "my-agent-id", "public_key": "public-key-here"}
    ),
    private_key=os.environ["PRIVATE_KEY"],
    supabase_url=os.environ["SUPABASE_URL"],
    supabase_anon_key=os.environ["SUPABASE_ANON_KEY"]
)

phlow = PhlowMiddleware(config)

# Use with FastAPI
from phlow.integrations.fastapi import create_phlow_dependency
auth_required = create_phlow_dependency(phlow)

@app.post("/api/a2a/message")
async def handle_message(context: PhlowContext = Depends(auth_required)):
    # Process A2A message using phlow context
    return {"status": "received"}

📚 Documentation

• Getting Started - Quick setup guide
• A2A Compatibility - A2A Protocol integration
• API Reference - Complete API docs

🌐 Language Support

Language	Package	Framework Support
Python	phlow	FastAPI

🚀 Roadmap & Vision

Phase 1: Authentication Middleware (Current)

• ✅ JWT authentication for A2A Protocol
• ✅ Agent card storage in Supabase
• ✅ Basic middleware for FastAPI
• 🔄 Enhanced security and testing

Phase 2: Agent Discovery & Registry (Next 6 months)

• 🎯 Central agent registry with search capabilities
• 🎯 Agent capability matching and discovery
• 🎯 Enhanced agent profiles and metadata
• 🎯 Agent network visualization

Phase 3: Agent Marketplace Platform (6-18 months)

• 🎯 Agent monetization and billing
• 🎯 Usage analytics and performance metrics
• 🎯 Agent rating and reputation systems
• 🎯 Developer tools and SDK ecosystem

Our North Star: Create the first true marketplace where AI agents can discover, authenticate, and monetize their capabilities - making agent-to-agent commerce as simple as an API call.

Contributing

Pull requests welcome! We're building towards our marketplace vision:

Current Focus Areas:

• Authentication middleware improvements
• Supabase integration enhancements
• Agent registry and discovery features
• Developer experience improvements

Future Contribution Areas:

• Agent marketplace features
• Monetization and billing systems
• Analytics and metrics
• Community tools and governance

Scope: Please keep contributions focused on authentication, agent registry, discovery, and marketplace features. Communication protocols should be contributed to the A2A Protocol directly.

Quick Start

# Install dependencies
uv sync --dev

# Run all quality checks
uv run task quality

# Run tests
uv run task test

# Run E2E tests (requires Docker)
uv run task test-e2e

Development Commands

uv sync --dev              # Install all dependencies
uv run task test           # Run all tests with coverage
uv run task test-unit      # Run unit tests only
uv run task test-e2e       # Run end-to-end tests (Docker required)
uv run task lint           # Run linting with auto-fix
uv run task format         # Format code
uv run task type-check     # Run type checking
uv run task quality        # Run all quality checks
uv run task build          # Build distribution packages
uv run task clean          # Clean build artifacts

Testing

• Unit Tests: uv run task test-unit - Fast, mocked, runs in CI
• E2E Tests: uv run task test-e2e - Full stack, Docker required

License

MIT License - see LICENSE file for details.

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Built with ❤️ for the A2A ecosystem

Get Started | A2A Compatibility | API Reference