Performance Optimization

Model Selection Strategy

Claude Haiku 4.5 (90% of Sonnet capability, 3x cost savings):

• Lightweight agents with frequent invocation
• Pair programming and code generation
• Worker agents in multi-agent systems

Claude Sonnet 4.5 (Best coding model):

• Main development work
• Orchestrating multi-agent workflows
• Complex coding tasks

Claude Opus 4.5 (Deepest reasoning):

• Complex architectural decisions
• Maximum reasoning requirements
• Research and analysis tasks

Context Window Management

Avoid last 20% of context window for:

• Large-scale refactoring
• Feature implementation spanning multiple files
• Debugging complex interactions

Lower context sensitivity tasks:

• Single-file edits
• Independent utility creation
• Documentation updates
• Simple bug fixes

Extended Thinking

Extended thinking is enabled by default in Kiro, reserving tokens for internal reasoning.

For complex tasks requiring deep reasoning:

1. Ensure extended thinking is enabled
2. Use structured approach for planning
3. Use multiple critique rounds for thorough analysis
4. Use sub-agents for diverse perspectives

Build Troubleshooting

If build fails:

1. Use build-error-resolver agent
2. Analyze error messages
3. Fix incrementally
4. Verify after each fix