Scala Functional Programming & Effects

Trust Score 90/100

Expert guidance on functional programming in Scala: Cats typeclasses, Cats Effect, ZIO 2, fs2 streams, and patterns for concurrency, resource safety, and stream

triggers:scala fpcats effectziofs2 streamsparMapNfunctional programmingresource safety

GitHub SKILL.md

What it does

This skill provides practical, example-driven guidance for functional programming in Scala across the Typelevel ecosystem (Cats, Cats Effect, fs2) and ZIO 2. It explains mental models for effects, concurrency primitives (Ref, Semaphore, Deferred/Promise, Fibers), resource safety patterns, and common parallelism idioms with code snippets and references.

When to use it

Use this skill when writing or reviewing Scala applications that require safe concurrency, effectful IO, streaming with fs2, or when choosing between Cats Effect and ZIO. Trigger it for questions like: running tasks in parallel, structured concurrency, resource management, tagless-final architecture, or error handling in FP.

What's included

Scripts: none in this repo
References: includes a references/ folder with deep-dive notes (cats-typeclasses, cats-effect, zio, parallelism, fs2, tagless-final)
Instructions: clear mental-model explanations, code examples for parMapN, race, timeout, Resource/ZIO.scoped usage, and common pitfalls to avoid

Compatible agents

Likely usable by code-capable assistant agents (Copilot/Codex/GitHub Copilot-style, Claude Code, Gemini/Code assistants) because it contains language and code examples geared to developer workflows.

Audit Summary

Pure documentation/reference skill for Scala functional programming (Cats, Cats Effect, ZIO 2, fs2). No scripts to execute — SKILL.md only. Well-structured with clear frontmatter triggers, comparison tables, code examples in both CE and ZIO, and a common mistakes section. Delegates depth to references/ files. No security concerns whatsoever.

Watch Out

References are listed but not bundled — agent would need to resolve them from the GitHub repo

Notes

No scripts present. Skill is purely a reference/consultation skill for Scala FP topics. Quality documentation with good progressive disclosure.

Information

Repository: skills
Stars: 9

Trust Score

Overall90

Security100

Code Quality82

Architecture78

Usefulness65

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