it runs python code in the browser! you can import various python packages like numpy, pandas, matplotlib!

it’s powered by https://pyodide.com/.

no wonder there’s so many online python interpreter

it means you can create a website with embedded python tools / logic

"I wrote significantly more code on my phone this year than I did on my computer."

"My tools.simonwillison.net collection of HTML+JavaScript tools was mostly built this way: I would have an idea for a small project, prompt Claude Artifacts or ChatGPT or (more recently) Claude Code via their respective iPhone apps, then either copy the result and paste it into GitHub’s web editor or wait for a PR to be created that I could then review and merge in Mobile Safari. Those HTML tools are often ~100-200 lines of code, full of uninteresting boilerplate and duplicated CSS and JavaScript patterns—but 110 of them adds up to a lot!"

code for tools: https://github.com/simonw/tools

so each tool has one html.

https://github.com/simonw/tools/blob/main/TOOLS_GUIDE.md shows dev setup. hosted with github pages. it shows a sample tool e2e build and test process. seems can be used as context for other tool dev.

it also has many python tools, didn’t see tests. not sure how it’s get tested from phone.

one interesting thing is we can run python script like the following

uv run https://tools.simonwillison.net/python/list_llm_model_ids.py

This is convenient and powerful.

feels like the whole internet becomes a file system.

it’s a pain in short term because no incremental value created

and no obvious issue if not done

nothing break if not done

so no one is motivated to do that

it increase entropy of the system, could make next iteration harder due to increase cognitive load

however, still no one cares as people get promoted to setup but soon change teams

or the next team just ditch it and create something new

no one like clean up, unless there’s reward for that

and if there’s metrics, it will be better

something like save storage space, or save gcus / tpus

something tied to efficiency improvement, that has clear winning metrics

but many tasks has no efficiency gain, such as delete dead code, refactoring

only developer might feel the joy, but it takes time, and hard to quantify gain except lines of code contributed

g has some awards setup for eng excellence to encourage this type of work

is it possible to have a cleanup agent to automatically clean up?

like garbage collector in modern languages

like spam filtering in email

maybe we have to do it case by case

感觉把开发和部署都大大简化了

only 1GB in C drive

checked my user directory, >17GB

but after some cleanup, it’s still 17GB

select all folders and click properties, <1GB

so seems something hidden

googled "windows show hidden files"

file explorer -> views, select hidden items

now found the root cause

there’s a folder called "AppData", which is ~16GB

and seems i cannot simply delete the whole folder

1:1, ~300 hrs.

team meetings, ~360 hrs

deep work, ~400 hrs

according to google search, A standard full-time work year has 2,080 hours (40 hours/week x 52 weeks), but the actual number for most people is lower due to holidays, vacation, and sick days, usually falling between 1,700 and 1,900 hours.

so let’s use 1800 as standard working hours per year

so 1/6 of my time is spent with 1:1 meetings, 1/5 on team meetings, another 1/5 for deep work.

there are many slots not marked. or just default, which is 600 hrs, so 1/3.

some not tracked, like empty slots, or non-working-hours.

the main insight is 18% 1:1 and 20% team meetings. if consider gaps between the meetings, then roughly 50% time in office is in meetings. not counting lunch and breakfast time.

this seems better than last year, but still too much. and i’ve already removed lots of meetings.

a few ideas for next year: reduce time or 1:1 meeting frequencies. hopefully reduce to 12%. delegate some meetings to others.

another thing is communication cost. like realtime pings, emails. maybe ~10% of my time is handling those. CL/doc reviews also take 10%~20% time.

so roughly 8 hrs / week deep work time is likely already a max. have to use non working hours to get more time for deep work.

to reduce questions&answers pings, maybe improve documentation or develop some agent to help answer questions.

also need to consider agents to increase velocity.

and https://friendlybit.com/python/writing-justhtml-with-coding-agents/

and https://simonwillison.net/2025/Dec/15/porting-justhtml/

very impressive. for the porting, just a few prompts. and the coding agent works several hours.

see also https://simonwillison.net/2025/Sep/30/designing-agentic-loops/.

install extension pack for java. which includes gradle

for jdk, in antigravity, cmd+shift+p, "install new jdk"

install android studio,

open android studio, install sdk

click gradle, and run build. // maybe restart antigravity before this.

We needed a way to transmit UI that is safe like data, but expressive like code.

so agent produce content, client render the content, and send back messages

now everything is dynamic, from data, to code, to ui.

so scaffolding on top of base model can increase intelligence a lot

and strong base model also leads to better performance

input are problem, sample data, scorer, base model, some code evolution algorithm and calls base model.

output is the code that can solve the puzzles

the stronger the model, the more efficient and more accurate the code evolve component