Reddit User Warns: When Using Claude for Complex Projects, Tackle the Hardest Part First

A developer shared a critical lesson learned while using Claude AI to build a complicated document editor. The post details a recurring pattern where leaving too much of the design up to the AI led to project failure.

The Problem: Incremental Planning Leads to Implosion

The user found that when left to its own devices, Claude tends to create plans with incremental phases, starting with the simple thing and building out. According to the post, this approach is destined to fail: "This is going to bite you in the ass." The developer experienced this firsthand, "shooting myself in the foot a few times now" and ending up with what they call "complexity soup and the subsequent implosion."

The Root Cause: Context Degrades Model Performance

The explanation centers on how large language models handle context. The user states: "Models get significantly worse the more context is lying around." Attempting to debug or build upon an already complicated piece of code with a large context window leads to poor outcomes—"going to fail at best, or create hacking work arounds at worse."

The Solution: Do the Hard Thing First

The core advice is to explicitly guide the AI to tackle the most difficult part of a project from the outset. The user's recommendation is clear: "Make sure you have it do the hard thing first." and "Make sure your most complicated use case works, then have it draw the rest of the owl." This strategy aims to validate the feasibility of the core, complex functionality before layering on additional code that could complicate debugging later.