Prompt caching in Claude Code: what breaks the cache and what's safe
Switching model, effort, fast mode, MCP servers or /compact breaks the cache; editing files, modes and rewinding don't. Plus 5-minute/1-hour TTLs and /usage.
Claude Code
Everything about Claude Code: commands, CLAUDE.md, hooks, plugins, saving tokens. · 35 articles
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Claude Code
Claude API
LLM & NLP
AI Agents & Skills
Tips
AI Automation
Tools
System Design
Reading
Auto memory in Claude Code: Claude remembers your habits on its own
How auto memory differs from CLAUDE.md, the four note types, MEMORY.md's 200-line/25KB load limit, toggling it, relocating it, and token and security caveats.
Output styles in Claude Code: change how Claude responds for the whole session
The four built-in styles (Proactive, Concise, Explanatory, Learning), switching, custom styles, and styles vs CLAUDE.md, skills, hooks.
Permission rules in Claude Code: allow, ask, deny and evaluation order
Permission modes, rule syntax for Bash, Read, WebFetch and MCP, the deny → ask → allow order, and the limits of Bash rules you need to know.
MCP in Claude Code: local, project and user scopes plus .mcp.json for teams
Adding stdio/HTTP MCP servers, the three scopes and precedence, sharing .mcp.json without secrets, approving project servers.
Remote Control: drive your local Claude Code session from your phone
Continue a local Claude Code session from the Claude app or a browser: three ways to start, server mode, worktrees, no inbound ports.
Claude Code + Chrome: let the agent open the browser, read the console and test UI
Connect Claude Code to Chrome via the Claude in Chrome extension: console debugging, form testing, data extraction, site permissions and risks.
Auto mode in Claude Code: fewer permission prompts with a safety classifier
Auto mode uses a classifier to review each action: default blocks, how to enable it, autoMode settings, cost, and when you still need deny rules.
Sandboxing Bash in Claude Code: OS-level limits on files and network
Turn on the sandboxed Bash tool: Seatbelt, bubblewrap, allowedDomains, denyRead, excludedCommands and pitfalls to avoid.
Claude Code Review: multi-agent GitHub PR reviews with verified findings
Claude's managed PR review for Team/Enterprise: find-verify-rank-post, Quick/Standard/Deep levels, REVIEW.md, and how it compares with other review options.
Dynamic workflows and ultracode: Claude orchestrating hundreds of subagents with a script
Workflows are JavaScript scripts orchestrating subagents at scale: /deep-research, the ultracode keyword, /workflows, limits and cost.
The advisor tool: a cheap model does the work, a strong model advises at key moments
Pair a fast main model with a stronger advisor in Claude Code: enabling /advisor, model pairings, cost, limits and how it compares with opusplan.
Computer use in the Claude Code CLI: let the agent click, type and see your macOS screen
Enable computer-use via /mcp so Claude can test native apps, simulators and layout bugs: macOS permissions, per-app approval, safeguards and risks.
Claude Code status line: always see context %, cost and your 5-hour limit
Set up a Claude Code status line with /statusline or a jq script to show context %, session cost, 5-hour limit and effort, and save tokens.
Esc Esc in Claude Code: rewind code and conversation with checkpoints
Automatic checkpoints before every prompt; /rewind restores code, conversation, or summarizes to free context. What checkpoints don't track.
Run parallel Claude Code sessions with git worktrees without collisions
claude --worktree gives each session its own checkout; .worktreeinclude copies .env files; subagent isolation: worktree; cleanup rules.
Claude Code plugins: package skills, agents and hooks for your team, and their context cost
Plugins bundle skills, subagents, hooks and MCP into one /plugin install. Install scopes, marketplaces, per-turn context cost and security.
Karpathy's 4 CLAUDE.md principles: ask first, write less, change surgically, verify
The andrej-karpathy-skills repo explained: four principles that make Claude Code guess less, write less, and produce cleaner diffs. Setup and tradeoffs.
Cutting token usage in Claude Code: 8 habits from the official docs
Clear between tasks, pick the right model and effort, prefer CLIs over MCP, slim CLAUDE.md, filter output with hooks, delegate noisy work, be specific.
Why long Claude Code sessions burn usage: reading /usage and the prompt cache line
Seven reasons usage climbs in long sessions, how to read cache stats in /usage, the f fix shortcut, and telling the different limit messages apart.
Give Claude a check to run: tests, goals, Stop hooks and spec reviews
Without something to run, you are the test suite. Four levels of verification from prompt to Stop hook, and when a CLAUDE.md line should become a hook.
Keep CLAUDE.md under 200 lines: what to write, what to cut, where the rest goes
CLAUDE.md loads every session, so length hurts. A two-question test, a lean template, and when to use rules, skills or hooks instead.
Prompting Claude Code: say only what it can't see, “be ambitious”, and let it interview you
Prompt tips from the best practices: symptoms and definition of done, @file and pipes, “be ambitious”, and an interview prompt that yields SPEC.md.
Custom slash commands in Claude Code: turn repeated prompts into one-liners
Commands in .claude/commands, frontmatter, $ARGUMENTS/$0 arguments, shell injection with !`cmd`, and narrow allowed-tools.
Plan mode in Claude Code: agree on the plan before the agent touches code
Turning on plan mode (Shift+Tab, /plan, defaultMode), the approval flow, editing plans with Ctrl+G and when to use it.
Model routing for subagents: let Haiku do the chores, Opus the hard parts
Every Claude Code subagent can run its own model. Configure it well and you save tokens without losing quality.
Agent Teams in Claude Code: several Claude sessions working like a real team
One lead coordinates, teammates have their own context, share a task list and message each other directly. Experimental, powerful, token-hungry.
Claude Code Hooks: auto-format, block dangerous commands, enforce tests — no reminders needed
CLAUDE.md is advice; hooks are law. Scripts run at fixed points in the agent loop, so the result is guaranteed.
Running Claude Code headless (claude -p): agents in scripts, cron and CI
Not just a terminal chat — headless mode turns Claude Code into a CLI command you can drop into automated pipelines.
Claude Code GitHub Action: type @claude in a PR to review, fix bugs, answer questions
Anthropic's official action runs on your own runner: automated PR review, issue triage, docs sync, scheduled maintenance.
Claude Code now reads AGENTS.md: one instruction file for every AI coding tool
Since 2.1.277, if a folder has no CLAUDE.md, Claude Code uses AGENTS.md — the open format already used by Codex, Cursor and others.
Inside Claude Code: an AI agent is really a loop around a model
Claude Code, Cursor and Devin share the same “harness”: think → call a tool → observe → repeat. Understanding the loop makes you better at using agents.
A forgotten /loop and a four-figure API bill: what repeated agent runs really cost
Every iteration resends the whole context. If iterations are spaced longer than the prompt cache lives, each one pays full price.
claude-howto: a free 10-step Claude Code learning path (with a Vietnamese edition)
Installed Claude Code — now what? This open-source repo goes from slash commands to plugins, with diagrams, templates and self-check quizzes.
The new Claude Code Desktop: smoother parallel multitasking
A session sidebar, the /btw command, automatic sub-tasks and saved Environments — four changes that make multi-threaded work easier.
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