| name | a2a-sdk-patterns |
| description | 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. |
| allowed-tools | Read, Bash, Write, Edit, Grep, Glob |
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
./scripts/install-python.sh
./scripts/validate-python.sh
TypeScript
./scripts/install-typescript.sh
./scripts/validate-typescript.sh
Java
./scripts/install-java.sh
./scripts/validate-java.sh
C#
./scripts/install-csharp.sh
./scripts/validate-csharp.sh
Go
./scripts/install-go.sh
./scripts/validate-go.sh
Installation Scripts
All installation scripts are in scripts/ directory:
install-python.sh - Install Python SDK via pipinstall-typescript.sh - Install TypeScript SDK via npm/yarninstall-java.sh - Install Java SDK via Maven/Gradleinstall-csharp.sh - Install C# SDK via NuGetinstall-go.sh - Install Go SDK via go get
Validation scripts verify installation and dependencies:
validate-python.sh - Check Python SDK installationvalidate-typescript.sh - Check TypeScript SDK installationvalidate-java.sh - Check Java SDK installationvalidate-csharp.sh - Check C# SDK installationvalidate-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 exampletypescript-config.ts - TypeScript configuration examplejava-config.xml - Java Maven configurationcsharp-config.csproj - C# project configurationgo-mod.txt - Go module configuration
Authentication:
auth-api-key-template.txt - API key authenticationauth-oauth-template.txt - OAuth authenticationauth-jwt-template.txt - JWT authentication
Common Setup Patterns
Environment Variables
All SDKs use environment variables for configuration:
A2A_API_KEY=your_api_key_here
A2A_BASE_URL=https://api.a2a.example.com
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:
- API Key - Simplest, for server-to-server
- OAuth 2.0 - For user-delegated access
- 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 issuesA2AAuthenticationError - Invalid credentialsA2ARateLimitError - Rate limit exceededA2AValidationError - 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:
pip install --upgrade pip
pip install a2a-protocol
npm cache clean --force
npm install @a2a/protocol
mvn clean install -U
dotnet restore --force
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
- Check environment variables are set
- Verify API key format (no extra spaces/newlines)
- Ensure base URL is correct
- Check API key permissions
Connection Issues
- Verify network connectivity
- Check firewall/proxy settings
- Validate base URL is accessible
- 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 usageexamples/python-async.py - Async Python usageexamples/typescript-basic.ts - Basic TypeScript usageexamples/java-basic.java - Basic Java usageexamples/csharp-basic.cs - Basic C# usageexamples/go-basic.go - Basic Go usageexamples/error-handling-python.md - Python error handlingexamples/error-handling-typescript.md - TypeScript error handlingexamples/error-handling-java.md - Java error handling
Resources
Official Documentation:
GitHub Repositories:
Version: 1.0.0
Protocol Compatibility: A2A Protocol 1.0+
