Writing archive

Rust async functions store every value needed after an await. Learn to measure future size, identify saved fields, and reduce it without boxing everything.

Third-party APIs should not become your product model. Learn how a stable internal representation contains provider changes and keeps integrations understandable.

When you write let s: &str = "hello world", there are really two things in one line, living in two different places. Here is what each one is, where it lives, and why that explains lifetimes.

When an agent calls a tool, it stops and waits. If the tool is slow, the whole turn is slow, and the user waits with it. The fix is small: put a deadline on every tool call.

When you sync two systems with webhooks, the copy slowly becomes wrong: some events are lost, some are duplicated, some arrive in the wrong order. Reconciliation is the way to make the two systems agree again. Here is how to design an API for it.