Clippings from pyyupsk. Tools, writings, and work, cut and pasted by hand.https://fasu.dev/https://fasu.dev/writings/i-cut-my-agents-md-in-half-and-measured-it/https://fasu.dev/writings/i-cut-my-agents-md-in-half-and-measured-it/My agent instructions file grew to 8,659 words that every model read on every turn. I halved it, then probed old against new with a cheap model on real tasks. One probe caught a regression from my own cut.Tue, 29 Sep 2026 00:00:00 GMTdevloghttps://fasu.dev/writings/opencode-aipass/https://fasu.dev/writings/opencode-aipass/A dynamic opencode plugin for aipass-proxy that discovers AIPass models from GET /v1/models at startup — no more hand-maintained models in opencode.json.Sat, 19 Sep 2026 00:00:00 GMTtutorialhttps://fasu.dev/writings/using-aipass-proxy-with-opencode/https://fasu.dev/writings/using-aipass-proxy-with-opencode/This guide covers how to run aipass-proxy locally and connect it to opencode as a custom provider, plus a few ideas for what to do with it.Sat, 12 Sep 2026 00:00:00 GMTtutorialhttps://fasu.dev/writings/mise-the-one-tool-that-replaced-everything/https://fasu.dev/writings/mise-the-one-tool-that-replaced-everything/One Rust binary replaces many config files. mise is the version manager, environment loader, task runner, and secrets manager I now use.Thu, 03 Sep 2026 00:00:00 GMTdevloghttps://fasu.dev/writings/the-llm-wiki-pattern-a-second-brain-that-compounds/https://fasu.dev/writings/the-llm-wiki-pattern-a-second-brain-that-compounds/RAG (retrieval-augmented generation) rediscovers knowledge every time. My wiki accumulates it instead. This is Andrej Karpathy's LLM Wiki Pattern, built with a Claude agent that maintains the whole wiki.Wed, 22 Apr 2026 00:00:00 GMTdevloghttps://fasu.dev/writings/why-i-built-a-new-vite-env-plugin/https://fasu.dev/writings/why-i-built-a-new-vite-env-plugin/This article covers four problems with plain Vite environment variables and the plugin I built to fix them.Wed, 08 Apr 2026 00:00:00 GMTdevloghttps://fasu.dev/writings/stop-fighting-localhost-stable-dev-urls-with-cloudflared/https://fasu.dev/writings/stop-fighting-localhost-stable-dev-urls-with-cloudflared/This guide covers stable HTTPS URLs for local development with Cloudflare Tunnel. It stops webhooks from breaking after every restart.Wed, 04 Feb 2026 00:00:00 GMTtutorialhttps://fasu.dev/writings/git-from-zero-to-pull-request-a-practical-guide/https://fasu.dev/writings/git-from-zero-to-pull-request-a-practical-guide/This guide covers practical Git knowledge from init to pull request. It skips jargon and cheat sheets, and covers only what you need on day one.Sat, 31 Jan 2026 00:00:00 GMTtutorialhttps://fasu.dev/writings/2025s-security-crisis-why-memory-safe-languages-matter/https://fasu.dev/writings/2025s-security-crisis-why-memory-safe-languages-matter/In one year, researchers logged 48,185 CVEs, some exploited within hours, while Rust showed a 1000 times improvement in memory safety. These numbers changed how I think about security.Sun, 18 Jan 2026 00:00:00 GMTessayhttps://fasu.dev/writings/my-pragmatic-approach-to-building-npm-packages-in-2026/https://fasu.dev/writings/my-pragmatic-approach-to-building-npm-packages-in-2026/I use five tools, minimal config, and strict defaults. This is the npm package setup I actually maintain.Thu, 08 Jan 2026 00:00:00 GMTtutorialhttps://fasu.dev/writings/from-requirements-txt-to-pyproject-toml-python-evolution/https://fasu.dev/writings/from-requirements-txt-to-pyproject-toml-python-evolution/This article covers how uv, Ruff, and pyproject.toml replaced my entire Python toolchain. Together, they made Python feel more like TypeScript.Tue, 02 Dec 2025 00:00:00 GMTdevloghttps://fasu.dev/writings/the-art-of-clean-feature-architecture-what-i-actually-build/https://fasu.dev/writings/the-art-of-clean-feature-architecture-what-i-actually-build/I organize code into feature-based folders, with minimal abstractions and obvious boundaries. This is the architecture I actually ship.Sat, 16 Aug 2025 00:00:00 GMTessayhttps://fasu.dev/writings/a-node-js-developers-journey-into-python-territory/https://fasu.dev/writings/a-node-js-developers-journey-into-python-territory/This article covers Python's ecosystem from a Node.js developer's view. It looks at package management, virtual environments, and the tools that bridge the two.Sun, 11 May 2025 00:00:00 GMTessayhttps://fasu.dev/writings/tired-of-vue-boilerplate-heres-my-clean-fast-setup/https://fasu.dev/writings/tired-of-vue-boilerplate-heres-my-clean-fast-setup/This article covers my Vue starter, built after years of client projects. It sets up TypeScript, Vite, and file-based routing in minutes.Sun, 27 Apr 2025 00:00:00 GMTtutorialhttps://fasu.dev/writings/the-real-vue-js-developer-journey-wins-woes-and-lessons/https://fasu.dev/writings/the-real-vue-js-developer-journey-wins-woes-and-lessons/This article covers my move from React to Vue.js. It looks at the wins, the friction, and what both ecosystems taught me.Mon, 17 Mar 2025 00:00:00 GMTessay