My take on Skills For Real Engineers (mattpocock/skills) after testing the tdd skill with Claude Code:

• ✅ It changed how the agent worked. Claude Code wrote one failing test, then the code, four times in a row. I checked its session: each red and green run really happened.
• 🧾 The result was small and correct. 5 tests, 13 lines of code, and the leftover penny handled on purpose.
• 🗣️ It's honest. It told me one test passed on the first try, so that test didn't really drive any code.
• ⚙️ Installing is quick: one command, plain Markdown files, nothing to build.
• ⚠️ The skill wants to agree on what to test before it starts. In a one-shot run I had to settle that in my prompt.

"One skill file, and my coding agent started testing first like a careful engineer."