Nicolás Biondi | Blog (en) https://nicolasbiondi.com/en/blog/ Notes on AI agents, ecommerce and the infrastructure behind them. By Nicolás Biondi. en Sat, 03 Oct 2026 12:00:00 GMT Boss and interns: How I split coding work across several AI models without the bill exploding https://nicolasbiondi.com/en/blog/kitchen-brigade-ai-agents/ https://nicolasbiondi.com/en/blog/kitchen-brigade-ai-agents/ Sat, 03 Oct 2026 12:00:00 GMT 28 billion tokens in six months, 94% of them read from cache. How I split the work between one expensive model and several cheap ones at LENZ. AI Agents delegation caching tokens workflow The wrong key: We matched each sale to its row in the sheet instead of the camera sold, so duplicates slipped through https://nicolasbiondi.com/en/blog/la-llave-equivocada/ https://nicolasbiondi.com/en/blog/la-llave-equivocada/ Thu, 03 Sep 2026 12:00:00 GMT We matched sales by their row in the spreadsheet instead of the camera sold, so every re-pasted block came in as a new sale. Lessons data-quality deduplication reconciliation sqlite postmortem The test mode didn't test: We sent test mode on every order, but the invoicing API never checked: the account decides that https://nicolasbiondi.com/en/blog/el-ensayo-facturo/ https://nicolasbiondi.com/en/blog/el-ensayo-facturo/ Mon, 31 Aug 2026 12:00:00 GMT We integrated our invoicing provider's API trusting the test mode on each order. The API ignored it: the account decides the environment, not the order. Lessons invoicing postmortem idempotency erp-integration Midnight doesn't count: Our counter allowed 96 posts in 24 rolling hours and X blocked the bot at post 64 https://nicolasbiondi.com/en/blog/medianoche-no-cuenta/ https://nicolasbiondi.com/en/blog/medianoche-no-cuenta/ Thu, 13 Aug 2026 12:00:00 GMT A bot sat blocked on X: we counted the limit by calendar day and X counts the last 24 rolling hours. Lessons postmortem rate-limits rolling-window bots geocoding The doorbell won't ding: We changed a key and the alerts chat went quiet without a single error. Now we count the alerts that arrive https://nicolasbiondi.com/en/blog/diez-dias-sin-timbre/ https://nicolasbiondi.com/en/blog/diez-dias-sin-timbre/ Sat, 08 Aug 2026 12:00:00 GMT We changed a key and the alerts chat went quiet without an error. How to test a new key without posting anything and resend what was missed. Infrastructure postmortem tokens monitoring reconciliation Free with a meter: A cache spent 2,400 writes a day on a plan that allowed 1,000 https://nicolasbiondi.com/en/blog/gratis-con-medidor/ https://nicolasbiondi.com/en/blog/gratis-con-medidor/ Thu, 06 Aug 2026 12:00:00 GMT A cache wrote to KV on every visit: 2,400 writes a day against a quota of 1,000, and the daily meter we built so it wouldn't happen again. Tokens & Costs cloudflare quotas caching metrics postmortem One sign per agent: Two agents shared one 'do not disturb' and clashed; now each hangs its own sign, with an expiry https://nicolasbiondi.com/en/blog/un-cartel-por-agente/ https://nicolasbiondi.com/en/blog/un-cartel-por-agente/ Wed, 05 Aug 2026 12:00:00 GMT Test notices announced repairs finished weeks earlier. Two agents shared one mute setting and clashed; now each holds a permit with an owner and expiry. AI Agents postmortem notifications concurrency workflow Nothing was broken: An agent touched four files in production over a fault that was in Shopify's index https://nicolasbiondi.com/en/blog/nada-estaba-roto/ https://nicolasbiondi.com/en/blog/nada-estaba-roto/ Mon, 03 Aug 2026 12:00:00 GMT A valid search returned zero results. An agent changed four files in production and reverted them 18 minutes later: Shopify's index sorted itself out. AI Agents postmortem search data-quality metrics rollback The API played dumb: Three fields were missing and the API still said 'all good': it filled them in with whatever came to mind https://nicolasbiondi.com/en/blog/la-api-rellenaba-los-vacios/ https://nicolasbiondi.com/en/blog/la-api-rellenaba-los-vacios/ Sat, 25 Jul 2026 12:00:00 GMT I sent an order missing three fields and the vendor always said it was fine: it filled them in on its own. The official example gave it away. Ecommerce api-contract data-quality postmortem validation Every click crashed it: We moved a 130 MB file to a real database, and each click dropped from 5 seconds to 0.6 ms https://nicolasbiondi.com/en/blog/cada-clic-tumbaba-todo/ https://nicolasbiondi.com/en/blog/cada-clic-tumbaba-todo/ Mon, 25 May 2026 12:00:00 GMT An internal board kept tens of thousands of notices in a 130 MB file. We moved it to a real database, and each status change now takes 0.6 ms. Infrastructure sqlite json performance postmortem