3 Advanced AI agent design patterns

Covers three advanced AI agent design patterns: loop review and critique, hierarchical task decomposition with a coordinator/router agent, and agent as tool. The loop pattern uses a generator and critique agent in an iterative cycle until output meets specific conditions. The coordinator pattern acts as a smart project manager delegating subtasks to specialized sub-agents. The agent-as-tool pattern differs by keeping the primary agent in full control, treating sub-agents as stateless tools. Each pattern is demonstrated with code examples and a web UI, with trade-offs discussed around latency, cost, flexibility, and complexity.