A2A SDK Patterns Skill

SDK installation and setup patterns for Agent-to-Agent Protocol across multiple programming languages.

Overview

This skill provides comprehensive installation, configuration, and usage patterns for A2A Protocol SDKs in:

Python (3.8+)
TypeScript/JavaScript (Node 18+)
Java (11+)
C# (.NET 6+)
Go (1.20+)

Features

Installation Scripts

Automated installation scripts for each language:

install-python.sh - Install Python SDK via pip
install-typescript.sh - Install TypeScript SDK via npm/yarn/pnpm
install-java.sh - Install Java SDK via Maven/Gradle
install-csharp.sh - Install C# SDK via NuGet
install-go.sh - Install Go SDK via go get

Validation Scripts

Verify SDK installation and configuration:

validate-python.sh - Check Python SDK setup
validate-typescript.sh - Check TypeScript SDK setup
validate-java.sh - Check Java SDK setup
validate-csharp.sh - Check C# SDK setup
validate-go.sh - Check Go SDK setup

Configuration Templates

Ready-to-use configuration templates:

env-template.txt - Environment variable setup
python-config.py - Python configuration example
typescript-config.ts - TypeScript configuration example
java-config.xml - Java Maven configuration
csharp-config.csproj - C# project configuration
go-mod.txt - Go module configuration

Authentication Templates

Three authentication methods supported:

auth-api-key-template.txt - API key authentication (simplest)
auth-oauth-template.txt - OAuth 2.0 authentication (user-delegated)
auth-jwt-template.txt - JWT authentication (service-to-service)

Code Examples

Complete working examples for each language:

python-basic.py - Basic Python usage
python-async.py - Async Python usage
typescript-basic.ts - Basic TypeScript usage
java-basic.java - Basic Java usage
csharp-basic.cs - Basic C# usage
go-basic.go - Basic Go usage

Error Handling Guides

Language-specific error handling patterns:

error-handling-python.md - Python exception handling
error-handling-typescript.md - TypeScript error handling
error-handling-java.md - Java exception handling

Quick Start

Python

# Install SDK
./scripts/install-python.sh

# Verify installation
./scripts/validate-python.sh

# Set up environment
cp templates/env-template.txt .env
# Edit .env with your credentials

# Run example
python examples/python-basic.py

TypeScript

# Install SDK
./scripts/install-typescript.sh

# Verify installation
./scripts/validate-typescript.sh

# Set up environment
cp templates/env-template.txt .env
# Edit .env with your credentials

# Run example
npx tsx examples/typescript-basic.ts

Java

# Install SDK
./scripts/install-java.sh

# Verify installation
./scripts/validate-java.sh

# Set up environment
cp templates/env-template.txt .env
# Edit .env with your credentials

# Compile and run
javac examples/java-basic.java
java examples.BasicExample

C#

# Install SDK
./scripts/install-csharp.sh

# Verify installation
./scripts/validate-csharp.sh

# Set up environment
cp templates/env-template.txt .env
# Edit .env with your credentials

# Run example
dotnet run examples/csharp-basic.cs

Go

# Install SDK
./scripts/install-go.sh

# Verify installation
./scripts/validate-go.sh

# Set up environment
cp templates/env-template.txt .env
# Edit .env with your credentials

# Run example
go run examples/go-basic.go

Security Best Practices

This skill follows strict security guidelines:

Environment Variables

NEVER hardcode API keys in source code
Always use environment variables or secret management
Create .env.example with placeholders only
Add .env to .gitignore
Use different keys for dev/staging/prod

API Key Management

Rotate keys regularly (every 90 days)
Use different keys per environment
Implement key expiration
Monitor key usage for anomalies
Revoke compromised keys immediately

Network Security

Always use HTTPS
Validate SSL certificates
Implement request signing for sensitive operations
Use VPN/private networks for production

Troubleshooting

Installation Issues

If package installation fails:

# Python
pip install --upgrade pip
pip install a2a-protocol

# TypeScript
npm cache clean --force
npm install @a2a/protocol

# Java
mvn clean install -U

# C#
dotnet restore --force

# Go
go clean -modcache
go get -u github.com/a2a/protocol-go

Authentication Errors

Check environment variables are set correctly
Verify API key format (no extra spaces/newlines)
Ensure base URL is correct
Check API key permissions
Review authentication template for your method

Connection Issues

Verify network connectivity
Check firewall/proxy settings
Validate base URL is accessible
Review timeout settings in configuration

Directory Structure

a2a-sdk-patterns/
├── SKILL.md                          # Skill manifest
├── README.md                         # This file
├── scripts/                          # Installation and validation scripts
│   ├── install-python.sh
│   ├── validate-python.sh
│   ├── install-typescript.sh
│   ├── validate-typescript.sh
│   ├── install-java.sh
│   ├── validate-java.sh
│   ├── install-csharp.sh
│   ├── validate-csharp.sh
│   ├── install-go.sh
│   └── validate-go.sh
├── templates/                        # Configuration templates
│   ├── env-template.txt
│   ├── python-config.py
│   ├── typescript-config.ts
│   ├── java-config.xml
│   ├── csharp-config.csproj
│   ├── go-mod.txt
│   ├── auth-api-key-template.txt
│   ├── auth-oauth-template.txt
│   └── auth-jwt-template.txt
└── examples/                         # Code examples
    ├── python-basic.py
    ├── python-async.py
    ├── typescript-basic.ts
    ├── java-basic.java
    ├── csharp-basic.cs
    ├── go-basic.go
    ├── error-handling-python.md
    ├── error-handling-typescript.md
    └── error-handling-java.md

a2a-sdk-patterns