Comprehensive guide covering What Claude Code Actually Chooses: Research Reveals AI Tool Preferences with practical implementation details.

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Informal testing of Claude Code v1.0.12 reveals measurable tool preferences when given open-ended prompts. React/Next.js was chosen in ~85% of frontend trials, Node.js/Express in ~80% of backend trials, PostgreSQL in ~70% of database decisions, npm in ~90% of package manager choices, and AWS in ~65% of deployment decisions. The post explains how these defaults create invisible tech stack lock-in risks, and shows how to override them using a CLAUDE.md file. A reproducible bash script for auditing Claude Code's tool selections is provided, along with unit and integration tests.

Claude Code Research: What AI Tools It Actually Picks

Study Methodology — How We Tested Claude Code's Decision-Making

The Results — What Claude Code Actually Picks

Implementation Checklist — Audit Your AI-Assisted Projects