From Bloated Prompts to Lean Agents: AgentCore's Zero-Downtime Pivot

This migration case study reveals why token efficiency becomes critical at scale—and how to achieve it without service disruption. By shifting from hardcoded skills to a dynamic Registry-based catalog, the team reduced prompt bloat and created a foundation for advanced features like per-thread skill selection. The one-hour zero-downtime deployment demonstrates that architectural improvements don't require risky big-bang releases.