The problem: Pasting a 10-page document and saying “build this.” Claude gets confused by competing priorities and produces mediocre output.

The fix: Break work into small steps. Get the simplest version working first, then iterate. Think of each prompt as a single, clear task — not a project brief.

Example of what NOT to do:

Here's our entire product spec, competitive analysis, user research,
and engineering constraints. Build a PRD.

Do this instead:

Here are notes from 3 customer calls. Draft the problem statement
section of a PRD for the notifications redesign.

The problem: Re-explaining your product context at the start of every session wastes time and leads to inconsistent outputs.

The fix: Spend 15 minutes creating a CLAUDE.md file once. Save hours of repetition over weeks. Every project folder should have one.

The problem: Running massive batch tasks without cost awareness leads to unexpected bills.

The fix: Install ccusage (npm install -g ccusage) to track spending. Batch similar tasks together for efficiency. Most PMs land on the ~$100/month Max plan.

The problem: Taking Claude’s PRDs or analyses straight to stakeholders without review. Claude generates plausible-sounding content that may contain confident mistakes.

The fix: Always review outputs. Use Claude as a first draft, not a final one. Pay special attention to numbers, competitive claims, and strategic recommendations — these are where AI is most likely to sound right while being wrong.

The problem: Processing 10 user interviews one by one instead of simultaneously. This is the most common waste of time with Claude Code.

The fix: Use the phrase “parallel agents” explicitly when you want batch processing. Claude Code will process multiple files simultaneously, compressing hours into minutes.