Ilya Nikokoshev ilyannn

Instead of

assert(!array.isEmpty, "Array guaranteed to be non-empty because...")
let lastItem = array.last!

guard !array.isEmpty 
    else { fatalError("Array guaranteed to be non-empty because...") }

// ... etc ...

🤖 Created by Cursor / gpt-5.2-xhigh, edited by me

API-focused Agent Skill examples

Short, high-quality set of non-MCP skills that primarily act as API usage/docs for real products (auth, endpoints/operations, examples, rate limits, troubleshooting):

Hugging Face API tool-builder: explicitly lists Hub API endpoints and teaches how to query Hugging Face’s OpenAPI spec safely (via jq), with clear auth guidance (HF_TOKEN).
- Source: huggingface/skills hugging-face-tool-builder/SKILL.md
- Explicitly says "DO NOT ATTEMPT to read https://huggingface.co/.well-known/openapi.json directly as it is too large to process."

	// TODO: insert guards to use open-source version of random() if necessary

	func random(x: Int) -> Int {
	return Int(arc4random_uniform(UInt32(endBoundary)))
	}

	extension CollectionType {

	/// create a lazy succession of randomly ordered indices
	///

	def fold(s, p = 0):
	for i in [i+1 for (i, c), n in zip(enumerate(s), s[1:]+' ') if c != n]: p = print(s[p], i-p, sep="", end="") or i