Conor

🧙‍♂️ Conjurer of interfaces and abstractions
👨‍💻 Crafter of tooling to ease the burden of mundanity
🐭 Man of Vim
🥷 Full Stack Ninja
⌨️ Web Tech Enthusiast

[ElixirConf Europe @ElixirConfEU]

Day 2 of ElixirConf EU is here! 🌴

Keynote: @josevalim on Elixir types

[Conor @_csinclair_]

In Ash, where should you put your side effects?

before_transaction ≠ before_action

One runs before the DB transaction opens. One runs inside it.
Put your external API calls in the wrong one and watch your connection pool suffer!

Here's my very first contribution to the esteemed Alembic blog, helping you understand the lifecycle of an Ash action so you can avoid this common newbie footgun
https://t.co/UgpU9Xt5IY

#MyElixirStatus

[Conor @_csinclair_]

TIL Access.key/1 is Elixir's universal get_in accessor. Works on both maps and structs.

Bare atoms like [:foo] only work on maps. [Access.key(:foo)] works on both 🧠

#MyElixirStatus

[Conor @_csinclair_]

So cool to see not just @joshprice delivering a top notch keynote, but also deeply technical talks from 2 other team members!

[Alembic @teamalembic]

We love seeing @teamalembic team members on international stages! This year, @BuhotMicha12955 spoke at @CodeBEAMio Berlin, sharing how constraints can be powerful simplifiers in #Gleam, #Elixir, #Ash & inertia.js.

📖 https://t.co/CCaunrIYc9

[Conor @_csinclair_]

I still feel like Lua would be the better choice over Python for Programmatic Tool Calling, but still it's a great idea. And one which I've seen work well even with previous models, so I'll bet they've vastly improved capabilities with training towards these new Advanced Tools

[Conor @_csinclair_]

Anthropic changes the game once again!
https://t.co/fvYoYU49xQ

[Conor @_csinclair_]

Spotted this pattern in the wild in GenMCP 🔍

Real example: https://t.co/R73CAaQADR

Docs: https://t.co/7rZiSJ66zR

[Conor @_csinclair_]

🧵 TIL you can install specific static assets with Mix by setting `app: nil` and `compile: nil` 🤯

This means you can depend on JSON specs, schemas, or any static files without compiling them as apps.

Opens up some really interesting possibilities...

#MyElixirStatus

[Conor @_csinclair_]

Here's what it looks like in practice:

Mix pulls down the files, but doesn't compile or run anything. The `:sparse` key lets you pluck just the files you need! 📦✨

[Kamaro @kamaroly]

Subdomain-Based Multi-Tenancy in Phoenix: An Implementation Guide

https://t.co/D6EV0FGyEW

@AshFramework

[Zach Daniel @ZachSDaniel1]

Thanks to @_csinclair_, AshAI now supports MCP resources! Super cool work 😎 Take a look at his demo video, PR below! #AshFramework #ElixirLang

[Conor @_csinclair_]

https://t.co/ez672oUJyM

[Conor @_csinclair_]

Super tiny one, but TIL about `List.wrap/1`
- Wrap a value in a list if it's not a list already

Handy so that you don't need to do that pattern matching dance! 🕺
#MyElixirStatus

[Conor @_csinclair_]

That third point is actually such a big one. No requirement for backwards compat since LLM chains are rebuilt on every request 🧠

[Steve Krouse @stevekrouse]

MCP is mostly nonsense, but there are good effects:

1. Tricks management to green-light engineering efforts on APIs and OAuth DCR (Dynamic Client Registration)

2. Tricks LLM clients to integrate with everyone, ie an open-ecosystem, not walled gardens

3. (Just discovered this one today) The fact that MCP is a difference surface from your normal API allows you to ship MUCH faster to MCP. This has been unlocked by inference at runtime

Normal APIs are promises to developers, because developer commit code that relies on those APIs, and then walk away. If you break the API, you break the promise, and you break that code. This means a developer gets woken up at 2am to fix the code

But MCP servers are called my LLMs which dynamically read the spec every time, which allow us to constantly change the MCP server. It doesn't matter! We haven't made any promises. The LLM can figure it out afresh every time

This is why we've shipped capabilities to our MCP server that our API doesn't yet have. We aren't worried about committing ourselves to anything. We can always change the MCP server later and the LLM will figure it out

[Kamaro @kamaroly]

I am happy to see more and more people using @AshFramework .

[Conor @_csinclair_]

Repo https://t.co/tXLKJ9oisN

[Conor @_csinclair_]

If you're looking for a tool for testing MCP Resources for UI, MCPJam seems to do the trick pretty well 👍

https://t.co/NT3S7UtT5I

[Conor @_csinclair_]

Whoaaa this thing landed on a boat?!!

[REN @Renn_on_twtt]

@blueorigin Wooo

[Conor @_csinclair_]

Try running `mix https://t.co/I1GJIgu5PK` in your Elixir project.
That's right.
Project specific hexdocs search page.
Very very handy!

https://t.co/NX8m837Uh9

[Conor @_csinclair_]

If you missed it, worry not. There's a blog post which dives into everything he covered

https://t.co/TMJTQQkPvf

[Conor @_csinclair_]

This was one of the best talks I attended this year. Chris showed how to get deep into the mind of an LLM.
He used the raw power of Bumblebee and Nx, to filter out tokens as they're generated, forcing the tokens to fit the shape he wanted!

[Code BEAM @CodeBEAMio]

Make LLMs produce exactly what you need. Chris Beck from @bitcrowd demonstrates structured generation in Elixir.