March 2026 monthly summary for justlovemaki/AIClient-2-API focused on token economy, billing accuracy, and model-aware context management. Delivered two core improvements to align input_tokens with model-specific context windows and ensure reliable pricing across Claude model variants. Implemented a dynamic per-model context window mapping, replacing a single hardcoded constant with a maintainable function, and fixed an underbilling risk by updating TOTAL_CONTEXT_TOKENS to reflect the 1M-token Kiro context window. These changes improve token estimation accuracy, reduce revenue leakage, and support scalable model-specific tuning. Achieved robust traceability through clear commits and targeted tests, with a focus on business value and technical maintainability.