Someone put ads in the Claude Code spinner

Plus: understanding AI code, and how /fast works

How to Use Claude Code and Still Understand Your Own Code

How Claude Code Fast Mode Works

Why it's 2.5× faster, why it costs 2–6× more, and when to turn it on.

Fable 5 is offline. The government pulled it.

Here's what we know.

Two weeks with Claude Fable 5

and what is Loop Engineering?

Images cost 3x more tokens in Claude Opus 4.7

Here's what image tokenization is, what changed in 4.7, and when it's actually worth paying for

I Measured Claude 4.7's New Tokenizer. Here's What It Costs You.

The docs said 1.0–1.35x more tokens. On real content, I measured 1.47x.

Claude Code Sandbox: How /sandbox Works (and What It Doesn't Protect)

What Claude Code's /sandbox blocks at the OS, what still slips through, and a settings.json that matches the experiments

Claude Code Pricing (2026): Plans, Max vs API, and How Much It Costs

Pro, Max, Team, and API rates, plus real session math with prompt caching

I Tried to Reverse Engineer Claude Code's Usage Limits

Anthropic sends your utilization data on every API response. Claude Code doesn't show it to you. So I built a proxy to catch it.

Claude Code Extended Thinking

What Effort Levels Cost and What You Can't See

Claude Code System Prompt: What's Inside (Token Map)

Measured API payload: system text vs tools vs CLAUDE.md, and how to read /context

Claude Code Hooks: The Complete Guide

Also, the 5 hooks worth installing today

I Can't Stop Running Claude Code Sessions

Confessions of an AI coding addict

Claude Context Window Explained: 200K vs 1M in Claude Code

Needle experiments, latency, and when 1M still wins after flat pricing

I'm Building Agents That Run While I Sleep

I Have No Idea If What They Ship Is Any Good

Claude Code MCP: Setup, Token Cost, and When to Skip It

How Model Context Protocol works in Claude Code, what Tool Search changed, and when Bash is enough

How tool use actually works in Claude Code

What It Is, Why It Beat RAG for Code, and Why Claude Code Is Just a While Loop

Prompt caching notes + remote control + auth (newsletter)

Digest: caching notes, remote control from your phone, and auth changes. Deep dive linked.

How Prompt Caching Actually Works in Claude Code

The Hidden System That Makes Claude Code 80% Cheaper

Agent teams notes (newsletter)

Newsletter digest. For the canonical deep dive, see Agent Teams under the hood.

Claude Code Agent Teams: How They Work Under the Hood

Claude Code agent teams vs subagents, the filesystem protocol, cost, and how to debug a stuck team

All about Opus 4.6

Opus 4.6 shipped. Agent teams shipped. Your token budget did not survive.

How the Claude Code team really works

Tips from Boris Cherny, the creator of Claude Code

Clawdbot broke the internet

Then Anthropic made them change the name