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Show HN: Identifier for files and directories (like ISBN for Books)

https://github.com/skorotkiewicz/fsid
1•modinfo•1m ago•0 comments

Show HN: Holy Grail: Open-Source Autonomous Development Agent

https://github.com/dakotalock/holygrailopensource
1•Moriarty2026•8m ago•1 comments

Show HN: Minecraft Creeper meets 90s Tamagotchi

https://github.com/danielbrendel/krepagotchi-game
1•foxiel•16m ago•1 comments

Show HN: Termiteam – Control center for multiple AI agent terminals

https://github.com/NetanelBaruch/termiteam
1•Netanelbaruch•16m ago•0 comments

The only U.S. particle collider shuts down

https://www.sciencenews.org/article/particle-collider-shuts-down-brookhaven
1•rolph•18m ago•1 comments

Ask HN: Why do purchased B2B email lists still have such poor deliverability?

1•solarisos•19m ago•2 comments

Show HN: Remotion directory (videos and prompts)

https://www.remotion.directory/
1•rokbenko•21m ago•0 comments

Portable C Compiler

https://en.wikipedia.org/wiki/Portable_C_Compiler
2•guerrilla•23m ago•0 comments

Show HN: Kokki – A "Dual-Core" System Prompt to Reduce LLM Hallucinations

1•Ginsabo•24m ago•0 comments

Software Engineering Transformation 2026

https://mfranc.com/blog/ai-2026/
1•michal-franc•25m ago•0 comments

Microsoft purges Win11 printer drivers, devices on borrowed time

https://www.tomshardware.com/peripherals/printers/microsoft-stops-distrubitng-legacy-v3-and-v4-pr...
3•rolph•25m ago•1 comments

Lunch with the FT: Tarek Mansour

https://www.ft.com/content/a4cebf4c-c26c-48bb-82c8-5701d8256282
2•hhs•28m ago•0 comments

Old Mexico and her lost provinces (1883)

https://www.gutenberg.org/cache/epub/77881/pg77881-images.html
1•petethomas•32m ago•0 comments

'AI' is a dick move, redux

https://www.baldurbjarnason.com/notes/2026/note-on-debating-llm-fans/
4•cratermoon•33m ago•0 comments

The source code was the moat. But not anymore

https://philipotoole.com/the-source-code-was-the-moat-no-longer/
1•otoolep•33m ago•0 comments

Does anyone else feel like their inbox has become their job?

1•cfata•33m ago•1 comments

An AI model that can read and diagnose a brain MRI in seconds

https://www.michiganmedicine.org/health-lab/ai-model-can-read-and-diagnose-brain-mri-seconds
2•hhs•36m ago•0 comments

Dev with 5 of experience switched to Rails, what should I be careful about?

1•vampiregrey•39m ago•0 comments

AlphaFace: High Fidelity and Real-Time Face Swapper Robust to Facial Pose

https://arxiv.org/abs/2601.16429
1•PaulHoule•40m ago•0 comments

Scientists discover “levitating” time crystals that you can hold in your hand

https://www.nyu.edu/about/news-publications/news/2026/february/scientists-discover--levitating--t...
2•hhs•42m ago•0 comments

Rammstein – Deutschland (C64 Cover, Real SID, 8-bit – 2019) [video]

https://www.youtube.com/watch?v=3VReIuv1GFo
1•erickhill•42m ago•0 comments

Tell HN: Yet Another Round of Zendesk Spam

4•Philpax•42m ago•0 comments

Postgres Message Queue (PGMQ)

https://github.com/pgmq/pgmq
1•Lwrless•46m ago•0 comments

Show HN: Django-rclone: Database and media backups for Django, powered by rclone

https://github.com/kjnez/django-rclone
2•cui•49m ago•1 comments

NY lawmakers proposed statewide data center moratorium

https://www.niagara-gazette.com/news/local_news/ny-lawmakers-proposed-statewide-data-center-morat...
2•geox•50m ago•0 comments

OpenClaw AI chatbots are running amok – these scientists are listening in

https://www.nature.com/articles/d41586-026-00370-w
3•EA-3167•51m ago•0 comments

Show HN: AI agent forgets user preferences every session. This fixes it

https://www.pref0.com/
6•fliellerjulian•53m ago•0 comments

Introduce the Vouch/Denouncement Contribution Model

https://github.com/ghostty-org/ghostty/pull/10559
2•DustinEchoes•55m ago•0 comments

Show HN: SSHcode – Always-On Claude Code/OpenCode over Tailscale and Hetzner

https://github.com/sultanvaliyev/sshcode
1•sultanvaliyev•55m ago•0 comments

Microsoft appointed a quality czar. He has no direct reports and no budget

https://jpcaparas.medium.com/microsoft-appointed-a-quality-czar-he-has-no-direct-reports-and-no-b...
3•RickJWagner•57m ago•0 comments
Open in hackernews

Ask HN: Are LLMs good for implementing features in existing web apps?

2•endorphine•6mo ago
So I have a typical medium-sized Rails codebase, but with significant code that's not the dead simple CRUD stuff. For example, it talks with third-party APIs, does user authentication, uses Postgres FTS plus some other things.

I'm bored to work on it lately, and I was thinking whether using an LLM I could implement new features for it.

Are any of the current models at this point yet? I guess it should need to have a big context so that it reads all the views/controllers/models.

If so, which tool would you use? Something like Codex or Claude Code?

Comments

saadn92•6mo ago
I recommend Claude Code or Cursor, they’re usually the best right now. If you implement new features, be very specific. The more vague you are, the more it’ll just implement whatever it wants. Be wary, it also ends up breaking stuff sometimes, which can be annoying. But it does pretty well with Rails imo