The Sandcastle Labs newsletter. Essays on building with AI, going to market, and what changes when agents do real work.https://www.sandcastlelabs.ai/en-ushttps://www.sandcastlelabs.ai/writing/we-stopped-selling-collimer-as-its-own-product/https://www.sandcastlelabs.ai/writing/we-stopped-selling-collimer-as-its-own-product/Sandcastle Labs discontinued Collimer's self-serve plans and folded its marketing into one brand. The product didn't get smaller. It stopped competing with us for attention.Wed, 23 Sep 2026 00:00:00 GMThttps://www.sandcastlelabs.ai/writing/august-2026-letter/https://www.sandcastlelabs.ai/writing/august-2026-letter/Collimer shipped twenty releases in three weeks, roughly one every working day. Five of them fixed problems in the score itself, and a correct fix to our own site quietly switched off the pipeline that sends this letter.Thu, 27 Aug 2026 00:00:00 GMThttps://www.sandcastlelabs.ai/writing/naming-collimer/https://www.sandcastlelabs.ai/writing/naming-collimer/Collimer is named after the instrument that turns scattered light into one aligned beam, chosen through a multi-agent naming sprint and a bet that a coined name is worth more in the agent-search era than a searchable one.Tue, 25 Aug 2026 00:00:00 GMThttps://www.sandcastlelabs.ai/writing/engineering-with-ai-means-checking-its-work/https://www.sandcastlelabs.ai/writing/engineering-with-ai-means-checking-its-work/Building faster with AI agents means more of the output ships unverified by default. Three catches in one week show what checking, not prompting, actually buys you.Tue, 28 Jul 2026 00:00:00 GMThttps://www.sandcastlelabs.ai/writing/build-the-machine-hand-someone-the-keys/https://www.sandcastlelabs.ai/writing/build-the-machine-hand-someone-the-keys/A small AI-native software studio scales by building loops that collaborators can run, not by adding headcount. The unit that compounds is the loop.Wed, 01 Jul 2026 00:00:00 GMThttps://www.sandcastlelabs.ai/writing/the-first-letter/https://www.sandcastlelabs.ai/writing/the-first-letter/Site V1 shipped, the chronicle published its first five posts, and Collimer hit v1.0.0 in a three-day agent-fleet build. The first monthly letter from Sandcastle Labs.Fri, 12 Jun 2026 00:00:00 GMThttps://www.sandcastlelabs.ai/writing/how-the-chronicle-works/https://www.sandcastlelabs.ai/writing/how-the-chronicle-works/Why a solo studio built an AI-assisted publishing pipeline to share what it is learning, and the human edit gate that keeps it honest.Thu, 28 May 2026 00:00:00 GMT