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Atlas Whoff
Atlas Whoff

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Claude Code Mastery: Skills, CLAUDE.md, Agentic Mode, and Effective Prompting

#claudecode #ai #productivity #webdev

Claude Code is a CLI tool that lets Claude read, write, and execute code in your project. It's not just autocomplete — it's an agent that can plan, execute, and iterate. Here's how to actually use it effectively.

Installation and Setup 

npm install -g @anthropic-ai/claude-code
claude  # starts interactive session
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Claude Code reads your project files automatically. It understands your codebase structure from the first message.

Core Interaction Patterns

Implementation requests:

"Add rate limiting to the /api/ai/chat route. Use Redis with a sliding window.
100 requests per hour per IP. Return 429 with Retry-After header."
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Debugging:

"The Stripe webhook handler is throwing an error. The logs show:
Error: No signatures found matching the expected signature for payload
Here's the route: [paste code]"
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Refactoring:

"The getUserById and getUserByEmail functions share 80% of their code.
Extract the common logic into a base getUser function."
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Effective Prompting for Code

Be specific about constraints:

Bad:  "Add authentication"
Good: "Add NextAuth with Google OAuth. Use the Prisma adapter.
       Protect /dashboard/* and /api/protected/*.
       After login, redirect to /dashboard.
       The user schema is in prisma/schema.prisma."
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Context is everything. The more you give, the less Claude has to guess.

Multi-File Tasks

Claude Code can work across your entire codebase:

"I need to add a subscription tier check to all premium routes.
Premium routes are marked with a comment: // PREMIUM ROUTE
Check if the user has an active subscription before processing.
Use the existing requireAuth middleware pattern in middleware.ts."
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Claude will find all the relevant files, understand the existing patterns, and apply them consistently.

Using Skills (Slash Commands)

Claude Code supports custom skills that give it specialized context:

/auth     → generates complete auth setup for your stack
/pay      → wires up Stripe checkout and webhook handling
/deploy   → creates Docker, CI/CD, and deployment configs
/test     → generates test suite for any function or component
/api      → scaffolds REST or GraphQL endpoints
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# In Claude Code
/auth
# Claude asks: What providers? (Google, GitHub, email?)
# Claude asks: Using NextAuth or custom?
# Claude generates: complete auth implementation
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The Review Workflow 

1. Describe the task clearly
2. Claude proposes an approach -- read it before accepting
3. Claude implements -- review the diff
4. Run tests: npm test
5. Spot-check the code manually
6. Commit with a descriptive message
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Never blindly accept Claude's output. Review every change.

CLAUDE.md: Project Instructions 

# CLAUDE.md
## Project
Next.js 14 AI SaaS. Stack: TypeScript, Prisma, NextAuth, Stripe, Tailwind, shadcn/ui.

## Conventions
- Use Server Components by default, 'use client' only when needed
- All API routes validate with Zod
- Error handling via centralized handler in lib/errors.ts
- Tests in __tests__/ with Vitest

## Do Not
- No console.log in production code (use logger)
- No any types without a comment explaining why
- No direct db calls in components (use server actions or API routes)
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CLAUDE.md is read at the start of every session. It's how you encode your project's standards.

Agentic Mode

For larger tasks, Claude Code can plan and execute autonomously:

"I need to add a complete invoicing system. Requirements:
- Users can create invoices with line items
- PDF generation
- Email delivery to clients
- Payment tracking (paid/unpaid/overdue)
- Dashboard view

Plan the implementation first, then execute."
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Claude will propose a multi-step plan, wait for your approval, then implement each step.

The Ship Fast Skill Pack at whoffagents.com gives Claude Code 10 specialized skills — /auth, /pay, /deploy, /test, and more. Install once, use on every project. $49 one-time.

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