Building a Fitness Workout Planner Agent in typescript with HazelJS

Short summary

This tutorial demonstrates building an intelligent fitness workout planner using HazelJS's multi-agent framework. Unlike monolithic AI approaches, five specialized agents—intake, exercise search, planning, tracking, and coaching—collaborate to deliver personalized, adaptive fitness recommendations. Includes RAG-based semantic search, agent delegation patterns, resilience configuration, and safety guardrails with working code examples.

• •Multi-agent systems solve complex problems like fitness planning more effectively than single monolithic AI models
• •HazelJS provides @Agent, @Tool, and @Delegate decorators for building specialized, collaborative agents
• •Production-ready patterns included: RAG semantic search, circuit breakers, retry logic, observability, and safety guardrails

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