Reference · Intermediate · 10 min
AGENTS.md vs CLAUDE.md in Claude Code: which one it reads
Since 2.1.277 Claude Code reads AGENTS.md when there's no CLAUDE.md. What it reads in each case, the CLAUDE.local.md trap and one file for all AI tools.
Library
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Reference · Advanced · 15 min
Claude Code auto mode in depth: the classifier and its rules
How Claude Code's auto mode decides, what it blocks, how to teach it your environment with /auto-mode-setup or autoMode, and why to keep "$defaults".
Checklist · Intermediate · 15 min
Before you give Claude Code permissions: a security checklist
Ten checks before giving Claude Code more permissions or opening it in someone else's repo: modes, deny, ask and allow, trust, sandbox and bypass.
Checklist · Intermediate · 10 min
Before installing plugins, skills or MCP in Claude Code
What to check before installing an editor extension, plugin, skill or MCP server in Claude Code: what it runs, where it comes from and how to remove it.
Checklist · Intermediate · 10 min
Before merging Claude Code's code: a review checklist
Eight checks before merging code written by Claude Code: real tests, secrets, dependencies, licenses, scope, independent review and a bash script.
Recipe · Basic · 10 min
Claude Code in Spanish, no fluff: language and the Concise style
Make Claude Code always answer in Spanish and without filler: the language setting, the Concise style and a CLAUDE.md rule against drifting to English.
Recipe · Intermediate · 15 min
Claude Code headless: claude -p in scripts and cron, step by step
Use claude -p in a cron script: a daily commit summary with minimal permissions, a turn cap, JSON output and your subscription login. Tested.
Comparison · Basic · 8 min
Claude Code in JetBrains, Visual Studio, Xcode, Zed and Neovim
What integration Claude Code has in JetBrains, Visual Studio 2022/2026, Xcode, Zed, Cursor and Neovim: who maintains it, how to install it, what you lose.
Comparison · Intermediate · 20 min
Claude Code vs Codex vs Gemini vs Cursor: same task, with data
How to compare Claude Code, Codex CLI, Gemini or Antigravity CLI and Cursor CLI on the same task, with hidden tests and 5 runs. Methodology and scripts.
Recipe · Intermediate · 10 min
/clear vs /compact in Claude Code, and idle compaction
When to use /clear or /compact in Claude Code, what survives a compaction and how to turn off idle compaction with the idleCompaction setting.
Template · Intermediate · 5 min
Claude Code settings.json checker: find permission risks
Paste your Claude Code settings.json and see every permission risk with its level, a plain explanation and the link to the official documentation.
Recipe · Intermediate · 20 min
Create a Claude Code plugin: init, testing, evals and marketplace
Build a Claude Code plugin with plugin.json and a skill, validate it, try it with --plugin-dir, run an eval and publish it in your own marketplace. Tested.
Recipe · Intermediate · 15 min
Debug a bug with Claude Code: from the error to a regression test
A six-step debugging flow for Claude Code: reproduce, hand over the evidence, hypotheses without edits, a failing test first and a minimal fix.
Checklist · Basic · 15 min
How to start with Claude Code in a project: 15-minute checklist
Your first 15 minutes with Claude Code in a project: check the folder, mode and model, /init, permissions, /context and a first task with evidence.
Reference · Basic · 10 min
Claude Code from scratch: a step-by-step route to start (2026)
A 10-step route to learn Claude Code: what it is, what you need, installing it, your first real task and the free official courses explained.
Template · Basic · 5 min
Free CLAUDE.md and AGENTS.md generator for Claude Code
Fill in a form and download a CLAUDE.md, an AGENTS.md or both, with live warnings for vague rules, pasted keys and badly written imports.
Recipe · Intermediate · 10 min
Claude Code usage limits: make your 5 h and weekly limit last
Read /usage and /context to see what eats your Claude Code limit and fix each cause: context, cache, subagents, model and effort level.
Recipe · Basic · 10 min
Claude Code plan mode: plan before touching any code
Use Claude Code plan mode: enter with Shift+Tab or /plan, edit the plan with Ctrl+G, save it in your repo and plan with Opus using opusplan.
Recipe · Basic · 5 min
Claude Code Opus 4.8: fast mode ends on 30 Nov, move to 5.5
Opus 4.8 fast mode in Claude Code will return errors from 30 Nov 2026. Check whether it affects you and move to Opus 5.5 in sessions, settings and CI.
Comparison · Intermediate · 10 min
Opus 5.5 vs Sonnet 5.5 vs Haiku 5.5 in Claude Code: which to use
Which model and effort to pick in Claude Code 2.1.316, official prices, opusplan and a reproducible test with hidden tests (results pending).
Template · Intermediate · 5 min
5 must-have Claude Code commands, ready to copy
Five skills for Claude Code: commit, PR description, fix the tests, explain code with Haiku and a review before you push.
Template · Intermediate · 15 min
Claude Code project template: a repo set up and safe
A Claude Code template repo: short CLAUDE.md, settings.json with allow, ask and deny, safety and test hooks, two skills, a reviewer and CI. Tested.
Comparison · Basic · 8 min
Claude Code vs Desktop vs Cowork vs claude.ai: which to use
Claude Code in the terminal, desktop app, Cowork, chat and on the web: what each one is, where it runs, which plan it needs and which to open.
Reference · Intermediate · 12 min
Claude Code skills vs hooks, MCP, subagents and plugins
CLAUDE.md, skills, commands, subagents, hooks, MCP and plugins in Claude Code: what each is for, when to use it, where it goes and its context cost.
Recipe · Intermediate · 20 min
Refactor legacy code with Claude Code without breaking anything
A 5-step method to refactor legacy code with Claude Code: plan mode, characterization tests, small changes with a commit each, and what /rewind undoes.
Reference · Intermediate · 5 min
Claude Code on your phone: Remote Control step by step and risks
Use Claude Code from your phone with Remote Control: requirements, QR pairing, what works in the app, errors with their exact text and privacy risks.
Reference · Intermediate · 15 min
Claude Code skills: which to install, how, and which to avoid
Which Claude Code skills and plugins to install, with the exact command, their measured token cost and a 4-step security review before you trust them.
Recipe · Basic · 10 min
Claude Code statusline: live model, context and usage limits
A dependency-free Python status line for Claude Code: model, branch, colored context, 5-hour and 7-day limits, and what to do when it doesn't show.
Recipe · Intermediate · 15 min
TDD with Claude Code: red, green and refactor with no cheating
A TDD cycle with Claude Code: tests first, minimal code with the tests locked by a permission rule, and git to check that it did not touch them. Tested.
Recipe · Intermediate · 15 min
Claude Code worktree: run agents in parallel without clashes
Run several Claude Code sessions in parallel with claude --worktree, copy your .env with .worktreeinclude and clean up worktrees without losing work.
Recipe · Intermediate · 15 min
Claude Code for free with Ollama or OpenRouter: what works
How to connect Claude Code to Ollama or OpenRouter with ANTHROPIC_BASE_URL, what breaks with non-Claude models, and the legal low-cost option.
Recipe · Basic · 5 min
Is Claude Code free? Pricing and which plan to pick (2026)
Claude Code isn't free: it comes with Pro, Max and Ultra, or you pay per token through the API. Official prices, which plan to pick and how to spend less.
Recipe · Basic · 10 min
Claude Code in VS Code: extension or terminal, how to install
Install the official Claude Code extension for VS Code (anthropic.claude-code), compare it with the terminal CLI and use it safely in Cursor.
Recipe · Basic · 15 min
How to write a CLAUDE.md that Claude Code actually follows
What to put in CLAUDE.md and what to leave out, where each file goes, @path imports, /init and /memory, plus a tested template for a web project.
Recipe · Basic · 5 min
Claude Code errors: 529, 401, 403, limits and how to fix them
The exact message, the cause and the fix for the most common Claude Code errors: 529 Overloaded, 401, 403, usage limits, full context, PATH and MCP.
Recipe · Intermediate · 10 min
Claude Code hooks: block dangerous commands and secrets
A Python PreToolUse hook that stops Claude Code from reading your .env, running dangerous rm -rf or doing git push --force to main. Tested.
Recipe · Basic · 10 min
Install Claude Code on Windows: native, WSL and common errors
How to install Claude Code on Windows 10 or 11 from PowerShell, CMD or WSL, fix your PATH, log in and solve the most common install errors.
Recipe · Intermediate · 15 min
MCP in Claude Code: connect Playwright, GitHub and your database
Add MCP servers to Claude Code with claude mcp add, share them in .mcp.json, control permissions and context, and avoid leaked secrets and injection.
Recipe · Intermediate · 10 min
Claude Code permissions: stop approving every command
Set up permission modes and allow, ask and deny rules in settings.json so Claude Code stops asking about everything, without letting risky commands in.
Recipe · Basic · 10 min
Create your first Claude Code skill, step by step
Build a project skill in .claude/skills with SKILL.md, a helper script and a description Claude recognizes. Example: release notes from git log.
Recipe · Intermediate · 15 min
Review every pull request with Claude Code in GitHub Actions
Set up anthropics/claude-code-action@v1 to review your PRs on its own, answer @claude in comments and keep costs in check. Ready-to-use workflows.
Recipe · Intermediate · 10 min
Claude Code subagents: split the work and save context
Create a subagent in .claude/agents/ with name, description, tools and model, and use it as a read-only reviewer of your diff before every commit.
News ·
Claude Code 2.1.314: block writes outside your project
New blockWritesOutsideWorkingDirectories setting: Write, Edit and NotebookEdit refuse files outside your working directories, in every mode.
News ·
Tampered Claude Code extension on Cursor: check your machine
On October 29 Cursor's marketplace served Claude Code versions 2.1.312 and 2.1.313 with an SSH backdoor. How to tell whether it affects you.