Claude For Developers

What This Guide Is

Claude for Developers is a working engineer's manual for the full Claude surface as of mid-2026: chat + Artifacts for instant spikes and internal tools, Claude Code for agentic multi-file work in real repos, Projects as a persistent brain for your codebase, and the API for shipping AI features. Every chapter is workflow, not theory — with the actual prompts, the revision grammar, and three complete real-world builds.

It's equally explicit about the failure modes: plausible hallucinations, stale knowledge, over-delegation, and the boring disciplines (branch, review, verify, test) that survive every model upgrade.

What's Inside

The Stack & The Sandbox

• The four surfaces (chat/Artifacts, Claude Code, Projects, API) and the one-line decision rule for each
• Models without the marketing, what each plan is actually worth, and the practical truth about context windows
• Exactly what the Artifacts sandbox runs (and the constraint list that prevents 80% of broken artifacts)

The Core Workflows

• The spike workflow: paragraph spec → hostile testing → single-concern revisions → read-before-trust
• The debugging protocol: the trifecta paste, ranked hypotheses with 30-second checks, and the "explain the fix back" move
• Test generation that doubles as a free code review
• From artifact to production: the 70/30 rule, spec harvesting, mock-layer replacement, and deploying small

Claude Code & Projects

• Where agentic coding shines, the four leash rules, and a fully annotated real session
• Writing a CLAUDE.md that onboards the AI like a senior hire
• Projects as your repo's brain: what to upload, what to skip, and the instruction that kills silent hallucination

Builds, Patterns & Production

• Three complete builds with the actual prompts: a support-ops tool (25 min), an API health dashboard (45 min), a release-notes CLI (20 min)
• 15 engineer prompt patterns: ranked diagnosis, adversarial code review, migration plans, performance hypotheses, incident postmortems, dependency triage, and more
• Shipping AI features: the API in one sitting — streaming, prompt caching, structured output, evals, and the cost levers
• Security & IP: secrets, proprietary code, license hygiene, customer data

Who This Is For

This guide is for engineers who want Claude as a force multiplier with standards intact — and tech leads deciding what AI workflow their team should standardize on.