FastAPI's Depends() handles per-request wiring. dependency-injector handles everything else — configuration, singletons, factories, and a declarative container that makes your entire object graph visible in one file.
15 min readYour BookStore API now has 200 customers who each want their own data. One missing WHERE clause leaks tenant data and kills the company. Here is how to make cross-tenant data leakage structurally impossible with context propagation, session events, and row-level isolation.
13 min readYour pool_size=5 default just met Black Friday traffic. 200 concurrent requests, 5 connections, 195 coroutines waiting on pool checkout — then timeouts cascade into a full outage. Here is how to configure connection pooling, read replicas, and circuit breakers for production traffic.
14 min readMost Astro tutorials stop at pnpm create astro. By the time you need TypeScript strict mode, Tailwind 4, and a Cloudflare deployment pipeline enforcing Lighthouse 100, you are patching together Stack Overflow answers. This post gets you production-ready from the first command.
12 min readEvery client:load directive you add ships JavaScript to every reader. Most of them do not need it. The difference between Lighthouse 100 and 85 is understanding which components need interactivity and choosing the right hydration strategy for each.
14 min readYour blog has 50 posts and a typo in one date field blows up the whole page. Content Collections catch schema violations at build time — before your readers do. This post covers the Content Layer API, Zod schemas, dynamic routes, and image validation.
12 min readContext windows forget. Production agents don't. The difference is a layered architecture: working memory, session memory, and long-term memory split into facts, events, and skills. Here's how real agents remember — and why forgetting on purpose matters.
10 min readA language model without tools is an expensive autocomplete. This post dissects how a production AI harness defines, registers, validates, and executes 40+ tools — from file reads to shell commands to MCP integrations — with type safety, concurrency control, and deferred loading.
9 min readEveryone debates which AI model is best. The real engineering happens in the harness — the production system of tools, permissions, memory, and orchestration that makes any model actually useful. This is a map of that system, drawn from real source code.
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