Andrés Castillo

AI Engineer - Web Architect

[Andrés Castillo @acastillodev]

The highest-signal thing you can add to any skill? A "Gotchas" section.

Real failures. Accumulated over time. "This function returns null, not an error, on insufficient funds."

That one line prevents a bad prod deploy. Full breakdown → [https://t.co/9cZF3BUeKc]

[Andrés Castillo @acastillodev]

Anthropic runs hundreds of Claude Code Skills internally. Thariq Shihipar from the Claude Code team just shared what they've learned.

9 skill types. Real production lessons. Here's my breakdown 🧵

[Andrés Castillo @acastillodev]

Most devs think a Skill is a markdown file with a prompt.

It's actually a folder — with scripts, templates, config, persistent state. Claude explores it progressively. That mental shift changes everything you build.

[Andrés Castillo @acastillodev]

3/3 The architectural implication nobody talks about: MCP decouples capability from model choice.

Full post → https://t.co/7vHbFgtcVN

[Andrés Castillo @acastillodev]

1/3 MCP won.

The question is no longer "should I use it?" — it's "how do I restructure my architecture around it?"

Here's the breakdown 🧵

[Andrés Castillo @acastillodev]

2/3 Before MCP: M APIs × N agents = chaos. Every combination needed a custom connector. Every model vendor had a different spec.

After MCP: write a server once. Any compatible agent uses it. Forever.

Think USB. Think LSP. Same idea.

[Andrés Castillo @acastillodev]

3/3 The developers who will matter aren't the ones who use AI the most. They're the ones who use it to go deeper — not as a replacement for understanding.

AI is raising the ceiling. But it's quietly lowering the floor.

Full post 👇 [https://t.co/MgMVmMgXcQ]

[Andrés Castillo @acastillodev]

1/3 NYT just published "The End of Programming as We Know It." [https://t.co/AWX6gXysKp] 70+ devs interviewed. 72% of tech leaders cutting junior hiring. Stanford says AI is already bleeding jobs from young devs.

The real problem isn't job losses. 🧵

[Andrés Castillo @acastillodev]

2/3 It's the pipeline. AI compresses junior onboarding from 24→9 months. But those same juniors show 17-point comprehension gaps. We're shipping faster and understanding less.

Who becomes the senior engineers if juniors skip the foundational struggle?

[Andrés Castillo @acastillodev]

@MoureDev @SaveToNotion #thread #ia

[Wes Bos @wesbos]

Wow I just learned in VS code you don't need to type var(-- to see your CSS variables, just -- and it will wrap it in var().