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DWKD
Journal

Claude

What actually shipped in AI tools this summer

A working leader's changelog for June to September 2026 — what changed in Cursor, Claude and ChatGPT, what it means if you run a team, and the parts worth ignoring.

Intermediate AI

Prompt caching, for people who pay the bill

Prompt caching can reduce repeated input charges. Check eligible prefixes, writes, expiration, and measured reuse before estimating what it will save.

Intermediate AI

Ten prompt habits worth testing

Review ten common prompt habits through controlled comparisons. Keep useful roles, examples, and constraints, and remove instructions that fail to earn their place.

Beginner AI

Three different things are called Projects

Claude, ChatGPT and Cursor all have a feature called Projects. They solve different problems, and assuming they are equivalent is how teams end up with the wrong one.

Beginner AI

The file every AI tool should read first

Project instructions can make AI coding work easier to review. What belongs in them, how loading differs between tools, and where real controls are still needed.

Intermediate AI