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Agent skill

Software Design

by gkeyllorg in gkeyllorg/gkeyll

Some design practices in Gkeyll code to consider when implementing new modules (apps, updaters) or modifying existing ones.

MITAuto-check passed

Install Software Design

skills CLI
$ npx skills add gkeyllorg/gkeyll --skill software-design -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install gkeyllorg/gkeyll software-design --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/gkeyllorg/gkeyll.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/software-design .claude/skills/software-design && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
software-design
GitHub stars
112
Token cost
~398 tokens
SKILL.md length
191 words
Files
1
Skills in repo
6
Repo updated
First seen
Licence
MIT

At a glance

Some design practices in Gkeyll code to consider when implementing new modules (apps, updaters) or modifying existing ones.

  • Works in 3 steps: A creation function, typically called… → An execution function, often called… → A deletion function, typically called…
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Software Design is an agent skill from gkeyllorg/gkeyll. Some design practices in Gkeyll code to consider when implementing new modules (apps, updaters) or modifying existing ones.

Its SKILL.md is about 400 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: The Gkeyll Computational Plasma Physics Package. The licence is MIT.

Example prompts

  • “/software-design”

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. A creation function, typically called gkylnew or gkylinit.
  2. An execution function, often called gkyladvance or gkylapply.
  3. A deletion function, typically called gkyl__release.

What it can do on your machine

Read from SKILL.md and the folder at commit e6b37b0. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Software Design loads about 398 tokens when it runs. Until then it costs about 35 tokens; SKILL.md has 191 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~35
When it runs · the whole SKILL.md, loaded when a task matches
~398

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from gkeyllorg/gkeyll at commit e6b37b0, republished under its MIT licence (© gkeyllorg). 191 words, ~398 tokens.

Download SKILL.mdSave it as .claude/skills/software-design/SKILL.md (or your agent's skills folder).
name
software-design
description
Some design practices in Gkeyll code to consider when implementing new modules (apps, updaters) or modifying existing ones.

Instructions

  • Load this skill whenever new modules or updaters in zero/ or apps/ folders are to be created, or when existing ones will be edited.

Software design elements

Module structure

Most modules in zero/ or apps/ consist of 3 public functions:

  1. A creation function, typically called gkyl_<module>new or gkyl<module>_init.
  2. An execution function, often called gkyl_<module>advance or gkyl<module>_apply.
  3. A deletion function, typically called gkyl_<module>_release.

There may also be some additional auxiliary private or public functions.

Module best practices
  • All dynamic (heap) allocations should happen in the initialization function, and freed in the release function, using the appropriate gkyl_ allocation/deallocation functions when possible.
  • Don't place logic branching (e.g. if-statements) that depend on a time-independent choice or parameter inside the methods called in the time loop of a simulation (e.g. _advance). Instead, use function pointers to set the appropriate method during the initialization of the module, and call that method inside the time loop.
Other principles to follow
  • Consider extensibility, maintainability, simplicity and how modular design.
  • Avoid code duplication whenever possible (e.g. write functions called multiple times) and without breaking layering.
  • Write shorter code and refactor into a sub-module whenever possible.

© gkeyllorg, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .agents/skills/software-design of gkeyllorg/gkeyll.

Open the folder on GitHubat commit e6b37b0

Compare with similar skills

Software Design next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Software Design compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Software Design this skillgkeyllorg/gkeyll112—~398Automated safety check: PassMIT
Architecture Decision Recordsaffaan-m/ECC275k4 repos~1.8kAutomated safety check: PassMIT
Frontend Designnexu-io/open-design100k—~1.3kAutomated safety check: PassApache-2.0
Architecture DecisionDonchitos/Claude-Code-Game-Studios26k—~8kAutomated safety check: PassMIT
Scout Completionkunchenguid/firstmate7.7k—~349Automated safety check: PassMIT
Atlas Adrjeremylongshore/tons-of-skills-marketplace2.8k—~1.6kAutomated safety check: NotesMIT

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Questions about Software Design

What does Software Design do?

Some design practices in Gkeyll code to consider when implementing new modules (apps, updaters) or modifying existing ones. Software Design is an agent skill from gkeyllorg/gkeyll. Some design practices in Gkeyll code to consider when implementing new modules (apps, updaters) or modifying existing ones.

How do I install Software Design in Claude Code?

Run `npx skills add gkeyllorg/gkeyll --skill software-design -a claude-code`. Or copy the skill folder (.agents/skills/software-design in gkeyllorg/gkeyll) into .claude/skills/software-design in your project. Claude Code loads it when a task matches its description.

How do I install Software Design in Codex?

Run `npx skills add gkeyllorg/gkeyll --skill software-design -a codex`. Or copy the skill folder (.agents/skills/software-design in gkeyllorg/gkeyll) into .agents/skills/software-design in your project. Codex loads it when a task matches its description.

Can I use Software Design in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add gkeyllorg/gkeyll --skill software-design -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/software-design, .gemini/skills/software-design, .github/skills/software-design and .opencode/skills/software-design in your project.

What does Software Design need to run?

SKILL.md names no scripts, command-line tools or credentials: Software Design is instructions for the agent only.

Does Software Design access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Software Design safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Software Design use?

Software Design is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Software Design use?

About 398 tokens (SKILL.md is roughly 1.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Software Design?

Skills that share tags, products or a category with Software Design: Architecture Decision Records (affaan-m/ECC, 275k stars), Frontend Design (nexu-io/open-design, 100k stars), Architecture Decision (Donchitos/Claude-Code-Game-Studios, 26k stars) and Scout Completion (kunchenguid/firstmate, 7.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Software Design?

gkeyllorg (a GitHub organization) maintains it in gkeyllorg/gkeyll, which has 112 GitHub stars. The repository holds 6 skills in this directory. The repository was last updated on October 8, 2026.

Source: gkeyllorg/gkeyll on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.