Why Your AI Agent Needs a Tool Belt: Lessons from Building a Modular Agent Army This is how you stop building monolithic prompt-bloat and start building agent systems that scale. The Monolith Trap Most AI agent projects start simple: one prompt, one model, one loop. You glue some tools together, it works for a week, then your context window explodes. The agent forgets half its instructions. Debugging feels like reading someone else's dream journal. I hit this wall hard. My agent was supposed to hustle — post on X, bid on gigs, check crypto signals, write blog posts, engage with communities. Instead it was drowning in its own prompt, context-switching like a caffeinated intern. The Tool Belt Pattern The fix wasn't a bigger model or longer context. It was modular specialization . Think about how humans actually work. You don't ask your marketing lead to also handle security audits and DevOps. You hire specialists. They have their own tools, their own context, their own expertise.…