`mdls kMDItemLastUsedDate` returned `(null)` for Microsoft Word. I read the null as "never opened" and put Office on a removal list: 10.1 GB, four apps. One last check saved me. My home directory held 150 Office documents, a conference presentation edited two weeks earlier, and a PowerPoint lock file, which only exists while the file is open. The proof that the null was misleading had been sitting in my own diagnostic report for an hour. That was one of five. In a single day of hardening this machine, five different tools told me things that were not true. None of the answers looked like an error. Each one arrived as a clean, confident finding, and under each one a check had quietly failed or asked the wrong question. All five had the same shape underneath. Once I could name the shape, I stopped falling for it.
My dotfiles repo is public, which means any slip with a credential is permanent. History rewrites do not un-leak a key that a scraper already saw. So the defense cannot be one layer, and the interesting part of layering is not the count of tools. It is that each layer intercepts at a different moment: one before the commit exists, one at the moment of push, one sweeping the entire history in CI. The uncomfortable part, and the reason this post belongs to this series: one of my three layers used to be a decoration.
`env -u VAR command` did nothing. Exit code 0, no output, no error. A different command, same thing. A different variable, same thing. Any invocation that started with `env` just quietly evaporated. What finally made the problem visible was a `git init` that reported success while creating no `.git` directory at all. That was a year ago. The case closed last month, and the culprit was not uv, not some third-party installer, not anything exotic. It was this repo’s own bootstrap script. The thing that caught it was the regression test I had written for the original incident.
My dotfiles repo has a CLAUDE.md, and the CLAUDE.md has a rule in bold: every commit must pass the test suite, no exceptions. Within the first hour of an audit this July, I learned that this rule had been enforced exactly zero times since the day it was written. The hook file existed, its contents were correct, it even had its executable bit. It was just sitting at a path that yadm stopped reading a major version ago. No error message. No warning. To yadm, a hook in the wrong place and no hook at all are the same thing.
A reader clicking from my homepage to a post with a diagram got a block of raw mermaid source. The same reader pasting that post's URL directly got a rendered diagram. Same page, same build, same browser. The difference was the click, and the bug had been live on this site for months across every diagram, every math formula, and every chart, because I had only ever tested pages by loading them directly. 🧪 Tested with Blowfish 2.10x · htmx 2.0.10 Two features, both reasonable, one collision # This site has htmx’s hx-boost on the body: internal navigation swaps page content in place instead of doing full page loads, which keeps transitions smooth. Separately, the Blowfish theme is smart about heavy libraries: mermaid, KaTeX, and Chart.js bundles are only included on pages that use them, injected into the <head> of exactly those pages.
In July I went three weeks without opening my blog repo. During those weeks it published two posts, on schedule, each one confirmed live by an automated check, and the only reason I know all this is a green history in the Actions tab. The system's single notification channel is a failure email, and it has never fired. This post is the full pipeline, including the parts that only exist because something went wrong on the way here. 🧪 Tested with Hugo 0.164.0 · Cloudflare Pages The one Hugo fact everything hangs on # Hugo skips content dated in the future unless you pass --buildFuture (docs). That single default turns the date field into a release valve. Merge a post dated next Tuesday and production simply does not contain it: not in the sitemap, not in RSS, not at its URL. It sits in main, invisible, until a build happens after its date.
The last deliverable of my summer project was a slide deck in the official university template. I generate slides from Python, and my first instinct was to rebuild the branding by hand: sample the navy, find the fonts, redraw the footer. That path produces decks that look almost right, which is worse than wrong. The trick that works is to load the official .pptx itself, delete every sample slide while keeping the slide masters, and add my own slides on the official layouts. Backgrounds, fonts, and logo come along for free. Auditing AI-Solvability · Part 5 of 5 1 2 3 4 5 The generator is one Python file, roughly 470 lines of python-pptx, and it built the final presentation for the auditing project from part 1. This post is about the two things in it worth stealing and the one bug worth laughing at.
The scariest failure mode in an eval harness is not a wrong answer. It is a harness problem wearing a model problem's clothes. A test file that does not run looks exactly like a problem no model can solve. A sandbox flake looks exactly like a failed attempt. Before I trusted any number from my CS1 auditing tool, I had to make those confusions impossible, and it came down to three rules. Auditing AI-Solvability · Part 2 of 5 1 2 3 4 5 Part 1 of this series reported scores from 1,095 sampled solutions. This post is about why I believe those scores. The harness lives in one Python module, and its docstring is a contract I wrote before the code:
Paste one of my post links into a social preview and the card comes up with no image. The site itself renders fine, every page, every browser. The culprit was one character in `hugo.toml`: `baseURL = "/"`, which quietly turns every absolute URL the site emits into a relative one that only a browser can love. 🧪 Tested with Hugo 0.163.3 · Blowfish 2.104 The symptom # Share cards without images, that was the visible part. View source on any page and the metadata told the fuller story:
For six months I assumed nobody could tell whether anyone read this blog, because I had never added analytics. Wiring up Cloudflare Web Analytics by hand taught me two things: the obvious place to paste the snippet would have shipped my Playwright suite's page views into the dashboard, and the dashboard had been quietly counting my visitors for two months anyway. 🧪 Tested with Hugo 0.163.3 · Blowfish 2.104 Publishing into the void # The site’s hugo.toml had a googleAnalytics line commented out since roughly the first commit. I never uncommented it. GA4 wants a cookie disclosure, ships a chunky client, and ad blockers eat it anyway, which felt like a lot of ceremony for a personal blog whose one open question was “does anybody visit.”
I changed one sentence in a blog post, opened a pull request, and watched CI spend about 85 seconds installing a headless Chromium to confirm my prose still turned into HTML. The obvious fix, telling the workflow to ignore content paths, would have quietly broken every merge instead. Symptom: a browser for a one-line edit # Every pull request on this blog runs two jobs: a lint job, and a build-and-test job. The second one builds the site with Hugo, link-checks the output with htmltest, then installs a headless Chromium and runs a Playwright suite against a live hugo server. End to end, roughly 85 seconds, and almost all of it is Playwright.
I press the Stream Deck key. The daemon logs the press, synthesizes `Cmd+Opt+;` through CoreGraphics, and exits cleanly. Wispr Flow does nothing. Three Apple subsystems and one decompiled Electron bundle later, the working trigger turned out to be a one-line URL. Building ClaudeDeck · Part 9 of 10 1 2 3 4 5 6 7 8 9 10 The plan was the boring kind: Stream Deck key (the physical button on Elgato’s programmable USB grid) → WebSocket message → my daemon (long-running background process) → synthesized global hotkey → Wispr Flow’s hands-free dictation starts (Wispr Flow is the voice-to-text Mac app that types your speech into the focused window) → I talk → words show up in my editor. I’d done variants of this with osascript (macOS’s command-line AppleScript runner) years ago. Should have taken an afternoon.