Chris Cook

Developer, Founder, Dad

Building the best AI assistant for Shopify
•

[Chris Cook @zirkelc]

Introducing ai-test-kit, a test library for AI SDK apps

I maintain a handful of packages in the AI ecosystem and keep repeating the same patterns:

Mocking a model, building parts, simulating a stream, ...

The kit abstracts that boilerplate into one-liners

[Chris Cook @zirkelc]

Install in claude code:

/plugin marketplace add zirkelc/agent-plugins
/plugin install agent-journal@zirkelc

`aj sync init` needs the CLI from the shell installer

The README has both, plus the one-line `gh` command for a private repo:

https://t.co/RpHxgU5dVX

[Chris Cook @zirkelc]

Git is already the best sync layer for an agent's notes

`agent-journal` can commit and push every entry claude code writes to your repo

Handy for remote or cloud agents: one place for all your entries

Off by default, and it only pushes to a remote you set

[Chris Cook @zirkelc]

Introducing 𝚊𝚐𝚎𝚗𝚝-𝚓𝚘𝚞𝚛𝚗𝚊𝚕 plugin

Working with agents is fast-paced: you work on multiple projects in parallel, make decisions on every turn, generate ideas and build new things.

A week later you cannot answer simple questions like "what did we do last week?"

𝚊𝚐𝚎𝚗𝚝-𝚓𝚘𝚞𝚛𝚗𝚊𝚕 makes the model record its work along the way: one small markdown file per milestone, written on its own, in a format that's easy to read and scan.

A year later, the answer is one question to your agent, or one `grep`, away.

[Chris Cook @zirkelc]

I tried append-only logs for the first iteration of agent-journal, but it has a few downsides IMO:
- a weaker model (way back with opus 4.5 and co) did accidentally overwrite instead of append
- permissions (this was before auto mode) are easier to grant for the Write() tool instead of a generated bash command that appends
- running multiple agents on different machines each with their journal, but all sync to one github repo (avoids merge conflicts)

[Chris Cook @zirkelc]

@theo Agree, especially because most of the harnesses probably won't exist in a few months

[Chris Cook @zirkelc]

@dani_avila7 You got it! 🫡

[Chris Cook @zirkelc]

@colinhacks @ssalbdivad Your product launches are always the nicest! 😅

What tool do founuse for the screenshots?

[Chris Cook @zirkelc]

@colinhacks Woah 🤯

[Chris Cook @zirkelc]

@ryangrowthh Do you use the X API? Bot post reads is capped at 1000 per day

[Chris Cook @zirkelc]

@cnakazawa Pardon, I meant the crap the llm added 😄

[Chris Cook @zirkelc]

@ImLunaHey @vitest_dev Are you running evals via vitest as well?

[Chris Cook @zirkelc]

@ImLunaHey @vitest_dev Did you try the new `vitest doctor` command?

https://t.co/w1JPHQUIsX

[Chris Cook @zirkelc]

I like some of the ideas open router added on top of ai-tool-set

Might steal them back for the AI SDK version 👀

[Chris Cook @zirkelc]

Shameless self promotion 🙈

The @OpenRouter team ported my ai-tool-set package into their new typescript agent sdk

Cool to see the design hold up!

[Chris Cook @zirkelc]

@etrepum @cnakazawa Thanks 🙏

[Chris Cook @zirkelc]

Does t3code have an cli and skill that lets the agent drive it?

Like create new worktrees, send messages between different sessions, etc.

[Chris Cook @zirkelc]

Shameless self promotion 🙈

The @OpenRouter team ported my ai-tool-set package into their new typescript agent sdk

Cool to see the design hold up!

[Chris Cook @zirkelc]

@cnakazawa I can imagein the corporate politics around that decision :-D

Does Flow have any benefits now over TS, or do they use it just for historical reasons?

[Chris Cook @zirkelc]

@cnakazawa Cool! Do you know if Meta still uses it for FB or other products?