Short engineering write-ups: individual problems worth writing down, usually because the obvious solution was wrong or the failure mode was invisible.https://jaystewart.co.uk/en-GBhttps://jaystewart.co.uk/notes/when-building-becomes-free/https://jaystewart.co.uk/notes/when-building-becomes-free/Agents made producing software nearly free. The judgment in front of the work and behind it got no cheaper at all, and my capacity for it is fixed. That inversion — not the speed — is what actually changed about the work.Thu, 20 Aug 2026 00:00:00 GMTWorking with agentshttps://jaystewart.co.uk/notes/development-environment-is-a-server/https://jaystewart.co.uk/notes/development-environment-is-a-server/One always-on machine, provisioned like production, that was simultaneously a warm CI runner and the place I worked — why, what it cost, and the reversal thirteen days later.Tue, 28 Jul 2026 00:00:00 GMTInfrastructurehttps://jaystewart.co.uk/notes/a-compiler-for-agent-context/https://jaystewart.co.uk/notes/a-compiler-for-agent-context/Code that lies gets caught by a compiler. The instruction files we hand coding agents get executed instead. groundtruth turns those claims into assertions that fail in CI.Sun, 26 Jul 2026 00:00:00 GMTOpen source