Don't code, specify
Spec Driven Development in practice. Building production software with AI agents.
- Indexed issues, last 90 days
- 3
- Latest publication
- Jul 21, 2026
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- Earliest in this view
- Jul 6, 2026
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The Happy Path Tax (opens the original)
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From São Paulo, Brazil.Read this one with Johnny Cash, “God’s Gonna Cut You Down.” A song about a bill that always comes due.Dear reader,Last time I promised you the tax you pay for every happy path your agent writes. Here it is, with a name, because a thing with a name is easier to refuse.You know the moment. You hand the agent a task, and a minute later there is code. It runs. The test is green. The demo does the thing you asked for. It looks done, so you ship the feeling of done and move on.W
Your MCP server spends 15,000 tokens before you type a word (opens the original)
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From São Paulo, Brazil.Read this one with The White Stripes. Two instruments, no bass, and it never needed more.Dear reader,Last week I told you the model was rarely your problem. This week, the harder half of it: the thing you keep adding to fix your agent is the thing breaking it.You know the setup. An MCP server, or three. A plan mode. A memory service. A subagent that goes off to “gather context.” A system prompt grown to two thousand words of rules. Every one of those was sold to you as an
Your agent re-reads 25,000 tokens of "PASSED" every turn (opens the original)
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From São Paulo - BrazilRead this one with Radiohead, “Everything In Its Right Place.” Which is more or less the whole idea.Dear reader,You have a CLAUDE.md at the root of your repo. Probably an AGENTS.md too. You wrote it so the agent would stop forgetting how your project works. Good. Now let me show you where your agent is actually bleeding, because it is not there.You have watched this happen. Forty turns into a session, the agent that was sharp an hour ago starts asking for a file it already
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