The latest articles on DEV Community by Ken Lu (@ai_with_ken). https://dev.to/ai_with_ken https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3979796%2F5ca191d2-68bc-4beb-820f-88f3acda6b7a.png https://dev.to/ai_with_ken en Ken Lu Thu, 11 Jun 2026 16:12:51 +0000 https://dev.to/ai_with_ken/claude-code-a-7-day-field-guide-for-working-engineers-31ep https://dev.to/ai_with_ken/claude-code-a-7-day-field-guide-for-working-engineers-31ep <p>I rolled out Claude Code on my own repos a few months ago and, like most people, the first week was a mix of "this is magic" and "why did it just delete my test fixtures." Below is the short, opinionated playbook I wish someone had handed me on day one.</p> <h2> Day 1 — Don't let it write code yet </h2> <p>Open a sandbox repo, point it at a small bug, and <strong>only let it read</strong>. The goal of day one is to feel how it budgets context, where it gets confused by your file layout, and how it asks for clarification. You'll save hours later.</p> <h2> Day 2 — Give it a single job per session </h2> <p>Resist the urge to "set up the project and then start the feature." Each session gets one commit-sized goal. If you find yourself saying "and also…", start a new session.</p> <h2> Day 3 — Wire up review, not generation </h2> <p>The first time I trusted Claude to <em>open</em> a PR I regretted it. The first time I trusted it to <em>review</em> a PR I didn't. Start there. A reviewer is bounded, idempotent, and easy to roll back.</p> <h2> Day 4 — Promote the good patterns into commands </h2> <p>Once you find a prompt that actually works for your codebase, <strong>save it as a slash command.</strong> Treat your <code>.claude/commands</code> folder like a build script you actually own.</p> <h2> Day 5 — Measure, don't vibe </h2> <p>Add a tiny log: how many suggestions did you accept, reject, edit? If your accept rate is below ~40% something is off in how you scope the task. The number is a mirror, not a scoreboard.</p> <h2> Day 6 — Teach it your stack's failure modes </h2> <p>A two-line <code>CLAUDE.md</code> that says "this codebase uses Tabs, not spaces, and never touch <code>migrations/</code>" saves more time than any prompt template.</p> <h2> Day 7 — Review your own work, with it </h2> <p>Open a session and say: <em>"be a senior reviewer of this branch, focus on what I missed."</em> That feedback loop is where the real productivity compounding lives.</p> <p>That's the loop. None of this is novel — but the discipline of doing it for a full week is. If you try it and a step blows up, drop the failure in the comments; I'm collecting patterns for a follow-up.</p> ai claude productivity tooling