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a2a-sdk-patterns

SDK installation and setup patterns for Agent-to-Agent Protocol across Python, TypeScript, Java, C#, and Go. Use when implementing A2A protocol, setting up SDKs, configuring authentication, or when user mentions SDK installation, language-specific setup, or A2A integration.

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SKILL.md (original)

Review the instructions the agent will receive before you install.

Agent-to-Agent Protocol SDK Patterns

Purpose: Provide installation, configuration, and usage patterns for A2A Protocol SDKs across multiple programming languages.

Activation Triggers:

  • SDK installation requests
  • Language-specific A2A setup
  • Authentication configuration
  • Package dependency issues
  • SDK version compatibility
  • Import/setup errors

Supported Languages:

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

Quick Start by Language

Python

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

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

TypeScript

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

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

Java

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

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

C#

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

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

Go

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

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

Installation Scripts

All installation scripts are in scripts/ directory:

  • install-python.sh - Install Python SDK via pip
  • install-typescript.sh - Install TypeScript SDK via npm/yarn
  • 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 installation and dependencies:

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

Configuration Templates

Templates are in templates/ directory:

Environment Setup:

  • env-template.txt - Environment variable template (all languages)
  • 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:

  • auth-api-key-template.txt - API key authentication
  • auth-oauth-template.txt - OAuth authentication
  • auth-jwt-template.txt - JWT authentication

Common Setup Patterns

Environment Variables

All SDKs use environment variables for configuration:

# Required
A2A_API_KEY=your_api_key_here
A2A_BASE_URL=https://api.a2a.example.com

# Optional
A2A_TIMEOUT=30
A2A_RETRY_ATTEMPTS=3
A2A_LOG_LEVEL=info

CRITICAL: Always use placeholders in committed files. Create .env.example with placeholder values only.

Authentication Setup

All SDKs support three authentication methods:

  1. API Key - Simplest, for server-to-server
  2. OAuth 2.0 - For user-delegated access
  3. JWT - For service-to-service with custom claims

See templates/auth-*-template.txt for implementation patterns.

Error Handling

All SDKs provide consistent error handling:

  • A2AConnectionError - Network/connectivity issues
  • A2AAuthenticationError - Invalid credentials
  • A2ARateLimitError - Rate limit exceeded
  • A2AValidationError - Invalid request data

See examples/error-handling-*.md for language-specific patterns.

Language-Specific Considerations

Python

  • Requires Python 3.8+
  • Install via pip: pip install a2a-protocol
  • Async support via asyncio
  • Type hints available
  • See examples/python-basic.py

TypeScript

  • Requires Node 18+
  • Install via npm: npm install @a2a/protocol
  • Full TypeScript definitions included
  • Promise-based async/await
  • See examples/typescript-basic.ts

Java

  • Requires Java 11+
  • Maven: Add to pom.xml
  • Gradle: Add to build.gradle
  • Thread-safe client
  • See examples/java-basic.java

C#

  • Requires .NET 6+
  • NuGet: dotnet add package A2A.Protocol
  • Async/await support
  • Dependency injection ready
  • See examples/csharp-basic.cs

Go

  • Requires Go 1.20+
  • Install: go get github.com/a2a/protocol-go
  • Context-aware operations
  • Goroutine-safe
  • See examples/go-basic.go

Troubleshooting

Installation Issues

Package not found:

# 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

Version conflicts: Run the appropriate validation script to check dependencies:

./scripts/validate-<language>.sh

Authentication Errors

  1. Check environment variables are set
  2. Verify API key format (no extra spaces/newlines)
  3. Ensure base URL is correct
  4. Check API key permissions

Connection Issues

  1. Verify network connectivity
  2. Check firewall/proxy settings
  3. Validate base URL is accessible
  4. Review timeout settings

Security Best Practices

Environment Variables:

  • NEVER commit actual API keys
  • Use .env files (add to .gitignore)
  • Create .env.example with placeholders
  • Use secret management in production (Vault, AWS Secrets Manager, etc.)

API Keys:

  • Rotate keys regularly
  • Use different keys for dev/staging/prod
  • Implement key expiration
  • Monitor key usage

Network Security:

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

Examples

Complete examples for each language:

  • examples/python-basic.py - Basic Python usage
  • examples/python-async.py - Async Python usage
  • examples/typescript-basic.ts - Basic TypeScript usage
  • examples/java-basic.java - Basic Java usage
  • examples/csharp-basic.cs - Basic C# usage
  • examples/go-basic.go - Basic Go usage
  • examples/error-handling-python.md - Python error handling
  • examples/error-handling-typescript.md - TypeScript error handling
  • examples/error-handling-java.md - Java error handling

Resources

Official Documentation:

GitHub Repositories:

Version: 1.0.0 Protocol Compatibility: A2A Protocol 1.0+

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