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From 2,300 Lines to 50: Rebuilding AI Agent Architecture

How I rebuilt a monolithic AI agent system into a clean, composable multi-agent architecture.

The Problem

A single 2,300-line orchestrator file that was impossible to maintain, test, or extend. Adding a new agent type required modifying 5+ files.

The Approach

Designed a plugin-based agent architecture using TypeScript discriminated unions, factory pattern, and YAML configuration. Each agent became a self-contained module with its own prompt, tools, and validation.

Results

Orchestrator LOC

2,300

50

Time to add new agent

4 hours

15 minutes

Test coverage

12%

94%

aiarchitecturerefactoring

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