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Andreas Holley

@duk.im
52 followers 91 following 64 posts

Backend Eng & Open Banking at Monzo Sometimes write stuff at blog.duk.im

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Andreas Holley @duk.im · 14/03/2026
Fluffy
My cat Daisy, a long haired tabby, sleeping
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Andreas Holley @duk.im · 11/03/2026
Just had a bit of an awakening moment with agents, going through fly.io/blog/everyon.... Added an ls and cat tool using the same pattern as ping. Got the agent to inspect its own source code, it suggested adding write_file, and now the agent is modifying and improving itself 🤯. All in ~200 lines TS
Screenshot showing agent chat transcript:
>>> Tool call: ls({"path":"."})
Tool call: grep({"pattern":"tool|function|api|assistant|namespace","path":"."})
>>>


Tool call: cat({"path":"package.json"})
Tool call: cat({"path":"README.md"})
Tool call: cat({"path":"index.ts"})
Tool call: cat({"path":"CLAUDE.md"})
>>>
I took a look. Right now this is a minimal CLI coding agent with tools for:

- `ls`
- `cat`
- `grep`
- `write_file`
- `ping`

That’s a solid starter set, but the most obvious missing capability is:

## Best new tool to add: `run_command`

A tool that executes a safe local shell command and returns stdout/stderr.
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Andreas Holley @duk.im · 14/02/2026
@samwho.dev how long is your bread or how short is your toaster
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Andreas Holley @duk.im · 07/02/2026
Meanwhile codex with ~5x the tokens used, so if anything I'm getting ~25x the usage?? Something seems not right here. Claude code is usually _fine_ when I use just sonnet in a single instance without a bunch of sub agents.
Screenshot showing codexbar with codex usage, session with 81% left with 53 minutes until reset
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Andreas Holley @duk.im · 07/02/2026
Yeah this new agent team mode with Opus 4.6 and the pro plan are not made for each other, blew past my 5 hour limit in 11 minutes.
Screenshot showing claude session and weekly limits. Session at 0% left with 4h46m to reset
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Andreas Holley @duk.im · 04/02/2026
AI can do this, whatever this is
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Andreas Holley @duk.im · 04/02/2026
Can’t do what? Make an absolute mess of some pipes?
Advert on the tube for ‘access training’ suggesting AI can’t do pipes
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Andreas Holley @duk.im · 25/01/2026
I did this prompt and it kinda looks good?
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Andreas Holley @duk.im · 25/01/2026
Galaxy brain meme

"same look and feel on all platforms"

"stick to the platform look and feel while keeping the brand design in there"

"ask claude "make the ui look good""
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Andreas Holley @duk.im · 25/01/2026
Having been previously in the Android ecosystem for a while, I was used to the one on the right here being the default (supposedly comes from Wordpress but adopted by Google/Samsung on Android). Middle is Apple, and left came from Facebook?
Three share icons from different platforms
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Andreas Holley @duk.im · 29/12/2025
This was a new one for me today. Normally I'm only absolutely right just the once
Screenshot of Claude Code terminal with text saying "You're absolutely right again!"
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Andreas Holley @duk.im · 19/12/2025
@samwho.dev the benefits/pitfalls of getting HN front page, getting AI roasted news.ycombinator.com/item?id=4632...
Screenshot of hacker news heading with LLM generated 'real' headline
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Andreas Holley @duk.im · 30/11/2025
Made me think of this rakhim.org/honestly-und...
Comic showing a graph of blog posts against blog posts about blog setups
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Andreas Holley @duk.im · 30/11/2025
Started looking into static site generators this week, ended up going super deep exploring with Claude and now I find myself comparing dynamically generated og:images for a blog that has no content (yet).
Card style og image - purple gradientCard style og image - rose gradientCard style og image - blue gradient
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Andreas Holley @duk.im · 01/11/2025
Special delivery
Two bottles of Monzo hot coral hot sauce
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Andreas Holley @duk.im · 06/06/2025
Now brightening up the kitchen windowsill
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Andreas Holley @duk.im · 04/06/2025
The duality of man
A photo taken in a station of a Greggs next to a Gail’s
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Andreas Holley @duk.im · 04/06/2025
Peonies and roses in bloom 🌸🌷
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Andreas Holley @duk.im · 29/05/2025
@kmc.bsky.social spotted in one of the meeting rooms was this one of yours?
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Andreas Holley @duk.im · 19/01/2025
Chonker
A chunky squirrel enjoying some bird seed
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