Hacker News: zenburnmyface

New comment by zenburnmyface in "GPT-5.2-Codex"

zenburnmyface — Thu, 18 Dec 2025 20:47:12 +0000

This is A+ satire

Automatic documentation screenshots (with bounding-boxes) via codex

zenburnmyface — Sat, 18 Oct 2025 13:20:11 +0000

I'd like to share this great documentation trick with codex. Our product's documentation website has lots of screenshots of the UI, often with highlighted sections. I got codex to automate creating them whenever we added a new feature or they need updating.

Pre-requisites

- codex (maybe claude code, but I haven't tried it) - MCPs: chrome-devtools

- [browserframe.sh](https://gist.github.com/CamDavidsonPilon/f381cfbaf983949fdf4b62c6790a8c3b) installed locally

- ImageMagick 7 installed locally

- codex has read/write access to your documentation site (and ideally web frontend to better discover interactions, but maybe not necessary).

I use a custom prompt in ~/.codex/prompts to generate the following:

```

### Adding screenshots (Always do if there is a web UI component to the request)

1. Open http://localhost:3000 using chrome-devtools__navigate_page to open our local development website.

2. Find the page we need.

3. Take viewport screenshot: chrome-devtools__take_screenshot → scratch/screenshots/inventory.png.

4. If we need to highlight a button, or modal, or dropdown, etc:

  1. Run chrome-devtools__evaluate_script with getBoundingClientRect() on the element; record x, y, width, height.

  2. Query window.devicePixelRatio via chrome-devtools__evaluate_script (retina viewport → 2).
  3. Convert rect to image pixels by multiplying x, y, width, height by the devicePixelRatio; compute bottom-right as (x+widthy+height).

  4. Draw highlight bounding box with ImageMagick e.g.
     ```
     magick scratch/screenshots/input.png -fill none -stroke "#ff41ff" -strokewidth 9 -draw "rectangle 2613,144 2930,217"    scratch/screenshots/input_boxed.png.
     ```
     Add a bit of padding too.

5. Use the cli tool `browserframe` to put a frame around the screenshot. Example: ``` browserframe input.png -o input_framed.png ``` Don't use a title in `browserframe`.

6. Screenshots are committed as PNGs and grouped in sub-folders under `static/img/` (for example `static/img/user-guide/`).

7. When adding new screenshots, place the file in the matching doc-area subfolder and reference it with a relative path such as `/img/user-guide/.png`

8. Close the browser program completely when finished.

### Request

$ARGUMENTS

```

Then in codex, I run:

```

/prompts:add-documentation-for the screenshots in docs page X are out of date, please update. If we reference a element, button, etc., in the text, please highlight it when appropriate.

```

Example: https://docs.pioreactor.com/user-guide/create-cluster

Comments URL: https://news.ycombinator.com/item?id=45627141

Points: 1

# Comments: 0

New comment by zenburnmyface in "Designing agentic loops"

zenburnmyface — Wed, 01 Oct 2025 02:35:51 +0000

This is in that direction: https://jannesklaas.github.io/ai/2025/07/20/claude-code-agen...

New comment by zenburnmyface in "Ask HN: Any recommended classes/trainings for an already-talented junior SWE?"

zenburnmyface — Sun, 27 Jul 2025 13:30:53 +0000

Check out courses by David Beazley: https://www.dabeaz.com/

New comment by zenburnmyface in "Doge Developed Error-Prone AI Tool to "Munch" Veterans Affairs Contracts"

zenburnmyface — Fri, 06 Jun 2025 14:17:39 +0000

Lavingia should be ostracized from tech for this. What an embarrassment.

New comment by zenburnmyface in "Surprisingly fast AI-generated kernels we didn't mean to publish yet"

zenburnmyface — Sat, 31 May 2025 14:27:28 +0000

meh. I feel this is just a linguistic shortcut, similar to how _trained_ biologists can talk about a species or organism evolving some trait. Of course the organism isn't _really_ evolving with any goal in mind, but that's clear to the speaker and audience. Whether or not LLMs understand (very unlikely), it's clear what we mean by an LLM "understanding": has the context + prior training to make reasonable predictions. But no one wants to write that each time.

New comment by zenburnmyface in "Supercharge Your PM Resume with AI Prompts: Start 2025 Strong"

zenburnmyface — Tue, 24 Dec 2024 15:03:33 +0000

slop

New comment by zenburnmyface in "The "Code of Conduct" Must Die [video]"

zenburnmyface — Sun, 08 Dec 2024 19:43:39 +0000

None of these people have to deal with other people.

New comment by zenburnmyface in "Small3dlib: Public domain 3D software rasterizer"

zenburnmyface — Fri, 27 Sep 2024 11:02:14 +0000

you're really showing your hand here...

New comment by zenburnmyface in "SymPy: Symbolic Mathematics in Python"

zenburnmyface — Wed, 28 Feb 2024 14:25:26 +0000

Oldest commit was from today: https://github.com/sympy/sympy

Where are you getting 14 years from?

New comment by zenburnmyface in "Ask HN: Programming Courses for Experienced Coders?"

zenburnmyface — Fri, 29 Dec 2023 21:19:45 +0000

I've also taken David's compiler course, and it was excellent. I highly recommend taking any course he offers that interests you.

New comment by zenburnmyface in "Ask HN: Any hardware startups here?"

zenburnmyface — Wed, 05 Jul 2023 20:04:41 +0000

We are building micro-bioreactors on the Raspberry Pi. Yes, hardware is _hard_ (and fun!)

https://pioreactor.com/

Pioreactor – The Raspberry Pi of Bioreactors

zenburnmyface — Fri, 09 Jun 2023 14:07:55 +0000

Article URL: https://pioreactor.com/

Comments URL: https://news.ycombinator.com/item?id=36258012

Points: 14

# Comments: 0

New comment by zenburnmyface in "Lawsuits Block Thousands of Seattle Homes, $39M for Affordable Housing"

zenburnmyface — Mon, 27 Feb 2023 23:26:18 +0000

Who said anything about low-income housing?

New comment by zenburnmyface in "Lab-Grown Meat Is Safe to Eat, FDA Says"

zenburnmyface — Mon, 28 Nov 2022 18:14:12 +0000

It’s call FBS, and it can be grown in a lab, too (if it’s even required…). See companies like Future Fields.

2018 Python Packages Survey

zenburnmyface — Fri, 18 Jan 2019 18:42:49 +0000

Article URL: https://twitter.com/Cmrn_DP/status/1086313788406550528

Comments URL: https://news.ycombinator.com/item?id=18941661

Points: 3

# Comments: 0

2018 Python Packages Survey

zenburnmyface — Fri, 18 Jan 2019 17:26:20 +0000

Article URL: https://python-packages-survey.com

Comments URL: https://news.ycombinator.com/item?id=18940921

Points: 1

# Comments: 0

MapReduce Joins, implemented in PySpark

zenburnmyface — Wed, 24 Dec 2014 03:18:00 +0000

Article URL: http://dataorigami.net/blogs/napkin-folding/18130947-joins-in-mapreduce-pt-1-implementations-in-pyspark

Comments URL: https://news.ycombinator.com/item?id=8791397

Points: 4

# Comments: 0

The Class Imbalance Problem in A/B Testing

zenburnmyface — Wed, 05 Nov 2014 17:29:44 +0000

Article URL: http://dataorigami.net/blogs/napkin-folding/17987495-the-class-imbalance-problem-in-a-b-testing

Hacker News: zenburnmyface

New comment by zenburnmyface in "GPT-5.2-Codex"

Automatic documentation screenshots (with bounding-boxes) via codex

New comment by zenburnmyface in "Designing agentic loops"

New comment by zenburnmyface in "Ask HN: Any recommended classes/trainings for an already-talented junior SWE?"

New comment by zenburnmyface in "Doge Developed Error-Prone AI Tool to "Munch" Veterans Affairs Contracts"

New comment by zenburnmyface in "Surprisingly fast AI-generated kernels we didn't mean to publish yet"

New comment by zenburnmyface in "Supercharge Your PM Resume with AI Prompts: Start 2025 Strong"

New comment by zenburnmyface in "The "Code of Conduct" Must Die [video]"

New comment by zenburnmyface in "Small3dlib: Public domain 3D software rasterizer"

New comment by zenburnmyface in "SymPy: Symbolic Mathematics in Python"

New comment by zenburnmyface in "Ask HN: Programming Courses for Experienced Coders?"

New comment by zenburnmyface in "Ask HN: Any hardware startups here?"

Pioreactor – The Raspberry Pi of Bioreactors

New comment by zenburnmyface in "Lawsuits Block Thousands of Seattle Homes, $39M for Affordable Housing"

New comment by zenburnmyface in "Lab-Grown Meat Is Safe to Eat, FDA Says"

2018 Python Packages Survey

2018 Python Packages Survey

MapReduce Joins, implemented in PySpark

The Class Imbalance Problem in A/B Testing

8 great data blogs to follow