docs: Create comprehensive troubleshooting guide for common ADK errors

[jpantsjoha]

Summary

This issue proposes creating a comprehensive troubleshooting guide in the adk-docs repository to help developers quickly resolve common ADK errors and configuration issues.

Problem Statement

While ADK provides helpful error messages when tools or agents are not found, developers would benefit from a centralized troubleshooting resource that covers the full spectrum of common issues encountered during ADK development.

Proposed Solution

Create: adk-docs/docs/troubleshooting/common-errors.md

Proposed Content Structure

1. Tool and Agent Errors

• Tool not found scenarios and resolution steps
• Agent configuration and lookup issues
• Type annotation problems with function tools
• Tool execution failures and debugging

2. Configuration Issues

• Environment variable setup
• Model configuration and authentication
• Service startup and port conflicts
• Project structure and dependency issues

3. Integration Challenges

• AG-UI middleware integration patterns
• Session state and memory management
• Multi-agent orchestration problems
• A2A protocol setup and debugging

4. Performance and Optimization

• Tool execution timeouts and resolution
• Memory usage optimization techniques
• Parallel execution configuration
• Long-running tool best practices

5. Development Workflow Issues

• Testing setup and common test failures
• Deployment configuration problems
• Streaming and real-time operation issues
• Debugging techniques and tools

User Benefits

1. Faster Problem Resolution: Centralized troubleshooting reduces time spent searching across multiple docs
2. Self-Service Debugging: Developers can resolve common issues independently
3. Better Developer Experience: Clear step-by-step resolution guides
4. Reduced Support Load: Comprehensive documentation handles frequent questions

Implementation Approach

• Clear Problem-Solution Format: Each issue with symptoms, causes, and step-by-step resolution
• Code Examples: Working examples of proper configuration and usage patterns
• Cross-References: Links to relevant sections in existing documentation
• Interactive Elements: Troubleshooting flowcharts where helpful
• Search-Friendly: Clear headings and keywords for easy discovery

Success Criteria

• Covers 80% of common support questions and GitHub issues
• Provides actionable resolution steps for each problem
• Integrates seamlessly with existing adk-docs navigation
• Maintains consistency with ADK documentation style and tone

Related Documentation

This troubleshooting guide would complement existing ADK documentation:

• Function Tools best practices (error handling)
• Agent configuration guides
• Deployment documentation
• Testing and development setup guides

The guide would serve as a practical companion to the comprehensive ADK documentation, focusing specifically on problem resolution and debugging workflows.

Cheers, JP

[stonyme]

This suggestion is really helpful.

[hangfei]

@polong-lin to help.