I have a bunch of coding agent skills I’ve accumulated over the last few months. Here’s how often my sessions use them:

Skill Claude Codex Copilot Overall
code 6.1% 69.1% 37.5% 51.5%
data-story 48.7% 16.4% 37.5% 28.0%
data-analysis 2.6% 35.2% 7.8% 21.8%
design 25.5% 23.6% 14.1% 21.8%
plan 8.5% 11.8% 14.1% 11.8%
agent-friendly-cli 3.7% 13.8% 11.1% 11.2%
devtools 20.4% 7.3% 9.4% 10.0%
llm 2.5% 8.7% 7.8% 7.4%
pdf 0.0% 7.9% 7.8% 6.6%
linkedin-cdp 14.3% 0.0% 5.6% 5.3%
uv-uvx 0.0% 9.5% 0.0% 4.9%
interactive-storytelling 7.1% 2.7% 7.1% 4.6%
demos 8.5% 2.8% 1.6% 3.5%
cloudflare 0.0% 4.3% 3.1% 3.3%
melt-mlt 0.0% 2.5% 1.6% 1.8%
vector-art 2.5% 2.4% 0.0% 1.7%
vitest-dom 0.0% 2.2% 0.0% 1.4%
memorable-explanations 2.6% 1.6% 0.0% 1.3%
npm-packages 0.0% 0.6% 0.0% 0.3%

Here are my observations, with surprises highlighted as ⁉️

  • code is the most used skill, by far. About half the sessions use it.
    • But Claude doesn’t use it much⁉️
  • The data-story and data-analysis skills were the most rapidly adopted.
    • I use Claude (with Claude Code and Copilot) a lot more for data stories. I use Codex for data analysis.
    • Therefore the webapp-testing and devtools skilss are used less by Codex.
  • The design skill is used consistently across agents. It was inspired by Claude’s design skill - but I don’t think it is particularly good, and needs revision.
  • agent-friendly-cli tool development is mostly with Codex, followed by Copilot, and very little with Claude.
  • Most pdf sessions are with Copilot / Codex, not Claude⁉️
  • Codex reads most skills diligengly.
    • It is the only one diligently reading my uv-uvx skill, even though every agent uses it⁉️
    • In fact, it is the only agent to have read every skill except linkedin-cdp (it never needed it.)