Don't let the model decide the checkout
In a chat-led app, some actions have to appear at the right moment every single time. That's not a job for tool calls. Here's the pattern we used instead.
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Architecture
Notes tagged Architecture
Decisiones con fecha: por qué escribo ADRs aunque seamos dos
Un Architecture Decision Record no es burocracia. Es la única forma que conozco de que un sistema siga explicándose a sí mismo cuando ya nadie recuerda por qué se hizo así.
Fail soft by default: integrating an LLM with systems that can go down
An AI feature is only as reliable as its least reliable dependency. Here's how I make LLM integrations degrade quietly instead of taking the request down.
The sidecar I didn't build
The RFC said ClamAV in a container. The research said GuardDuty. Here's what changed, what it cost, and the parts of a HIPAA upload pipeline nobody puts on the diagram.
Cache-Control will not save you from a bandwidth bill
A marketing site went from 32 GB to 32 TB of video traffic in nineteen days. The headers we added did nothing, and understanding why is the whole lesson.