John Boxall

CTO @SuperpilotAI. Previously CTO @mobify, acquired by Salesforce. Underground purveyor of the finest ASCII art and rarest emoji. Dad.

[John Boxall @johnboxall]

Incredibly proud of the @Mobify team! 🙏 @Mobify signs a definitive agreement to be acquired by @Salesforce: https://t.co/hfdp7WS3HP

[John Boxall @johnboxall]

Ran Crazy 8's for the first time in a long time today. Feels more relevant than ever in an age where it is easy to get distracted by "could we" (spoiler the answer is always yes) rather than focusing on "should we". AI facilitation speeds it up!

https://t.co/AwUNc5SD5y

[John Boxall @johnboxall]

In a worktree off the tip of main ... are there any exploitable code paths in our app? #promptoftheday

[John Boxall @johnboxall]

Finally gave my agents a virtual FS. Now tool inputs are file paths. Validation errors are resolved by editing and resubmitting the file.

[John Boxall @johnboxall]

Yesterday, when my LLM praised my coding decision I felt ... pride!? I must not live in service to the machine. Changing positive feedback to zaglo text so I don't forget what it is coming from.

[John Boxall @johnboxall]

@sintaxi Hmmm, I didn't enough about the correct number of moons. Back to the drawing board.

[John Boxall @johnboxall]

A shirt of a wolves howling at moon could always be improved by adding another wolf.

[John Boxall @johnboxall]

Has anyone at @PayPal ever tried to setup an account? Brutal.

[John Boxall @johnboxall]

Tokens on me!

[John Boxall @johnboxall]

@ClaudeDevs seems like a regression in Claude Code on the Web where you have to accept any Plan x2 for it to begin coding. Same issue with answering questions. You must answer the same question set twice to get the harness to move on!

[John Boxall @johnboxall]

Switched to @zeddotdev two weeks ago after their 1.0. Was interested in speed and got it. Started off by disabling all AI features in editor and using it to tweak/review output from Claude. So far so good!

[John Boxall @johnboxall]

"almost done thinking"

[John Boxall @johnboxall]

Claude-y baby, read my shell history and create me shortcuts for my most used commands also print me a cheat sheet

[John Boxall @johnboxall]

@randomfrequency @Cloudflare Can't choose the CDN customers use unfortunately and it is hard baked into Shopify / Salesforce B2C Commerce.

[John Boxall @johnboxall]

If I want to use @Cloudflare to reverse proxy a folder then I _must_ either a) use workers b) have an Enterprise account to set Origin Rules / Page Rule Host headers? Why is this so hard!? Am I missing a doc that explains this?

[John Boxall @johnboxall]

If you don't want to work against the constraints of the Anthropic APIs you must keep your system prompt and tools fixed across sessions. Push customer specific instructions down and design around not changing tools.

[ClaudeDevs @ClaudeDevs]

Useful tip to cut time-to-first-token on longer prompts in the API: pre-warm the prompt cache.

Send your system prompt before the user prompt. Claude writes it to the cache, but skips generating any output.

When the real user request lands, it'll hit a warm cache.

[John Boxall @johnboxall]

Have you really lived if you haven't used AsyncLocalStorage.

[John Boxall @johnboxall]

Much better results much faster on large refactors with Claude prompted to "use codemods".

[John Boxall @johnboxall]

If Claude tries to tell you it’s a “belt and suspenders” approach you know you’re about to see some grade A garbage code.

[John Boxall @johnboxall]

Thanks for letting me know Google meet 🫡

[John Boxall @johnboxall]

@tirellat @Shopify I did – the specific answers don't exist in the docs and what is in the docs only includes a subset of the behaviour. Perhaps this is intentional in that the unspecified behaviour is considered internal / private but it would be good to say so!

[John Boxall @johnboxall]

I'm always curious about behaviour of HTTP proxy features in web apps. @Shopify's App Proxy forwards HTTP requests to app defined origin. Docs are light on constraints – connect / read timeouts, response size, Shopify added headers (x-shopify) – any authoritative sources on this?