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Updated 2w ago

by Illyism

dev-skills

Developer and product skills for Claude Code, Cursor and Codex: 1-file AI evals and Chrome extension store assets.

  • New — Created in the last 30 days
  • Multi-agent — Targets three or more agents
Works with
  • Claude
  • Codex
  • Cursor
View on GitHub (opens in a new tab)

21 GitHub stars (21)

+21 in 29 days

Stars gained per day · daily snapshots since Oct 29
Stars gained per day, Oct 29 to Nov 4: +4 in total; the busiest day was Oct 30 with +2 stars.Oct 30: +2 starsOct 31: 0 starsNov 1: 0 starsNov 2: 0 starsNov 3: 0 starsNov 4: +2 stars
Stars gained between daily snapshots
PeriodNew stars
Oct 30+2
Oct 310
Nov 10
Nov 20
Nov 30
Nov 4+2
  • 6 skills (6 skills found in its SKILL.md files)
  • 0 forks (0 forks)
  • 2w ago last update (Last updated 2w ago)

Install

Skills CLI

npx skills add Illyism/dev-skills

Asks which skills and agents to install. Just one: npx skills add Illyism/dev-skills --skill benchmarking — add -g for every project.

Claude Code

git clone https://github.com/Illyism/dev-skillscp -r "dev-skills/code/benchmarking" ~/.claude/skills/

Copies the benchmarking skill into ~/.claude/skills/ for every project (use .claude/skills/ for one project). Repeat for the other skills listed below.

Plugin

/plugin marketplace add Illyism/dev-skills

Run inside Claude Code if the repository ships a plugin marketplace, then pick plugins from /plugin.

Skills can run code on your machine — read the SKILL.md first.

What it does

In the author's own words, from each skill's SKILL.md.

  • benchmarking

    Micro-benchmark and iteratively improve hot paths in any codebase — baseline first, mandatory improvement suggestions (bottleneck + 3 creative ideas + recommended next step), bounded attempts, user lock-in checkpoints, then human WHY comments after lock-in. Use when the user asks to benchmark, profile, optimize performance, compare implementations, or measure µs/op before shipping perf changes. A…

    code/benchmarking/SKILL.md on GitHub (opens in a new tab)

  • cleanup

    Cleanup code, optimize, refactor, delete the 80% to keep the 20%

    code/cleanup/SKILL.md on GitHub (opens in a new tab)

  • eval

    Build, run, or update minimal evaluation benchmarks for AI prompts, LLM calls, multi-model comparisons, and core functions. Use when creating new eval scripts, comparing models side-by-side, filtering specific candidate models, running benchmarks, or inspecting eval.md output artifacts.

    code/eval/SKILL.md on GitHub (opens in a new tab)

  • optimize

    Optimizes code, queries, and features based on actual usage by removing unused fields, aggregations, JOINs, and unused complexity. Use when the user invokes /optimize or asks to slim queries to what the UI actually uses.

    code/optimize/SKILL.md on GitHub (opens in a new tab)

  • elon

    Applies the Elon Musk Algorithm to coding, product, SaaS, design, and current issues. Use when the user invokes /elon or requests Elon Musk-style first-principles analysis.

    product/elon/SKILL.md on GitHub (opens in a new tab)

  • extension-store-assets

    Generates browser extension brand icons, Chrome Web Store promo tiles, promotional screenshots, brand guides, and listing copy. Uses OpenRouter gpt-image-2 via lib/blog-image-generator. Use when creating extension branding, Chrome Web Store assets, app icon concepts, store descriptions, or /extension-store-assets workflows.

    product/extension-store-assets/SKILL.md on GitHub (opens in a new tab)

Review before you install

A skill is a set of instructions and scripts your agent will follow, and it can run code on your machine. Read the SKILL.md and any scripts first — this listing is not a security review.