Diffs
openclaw/openclaw
Use the diffs tool to produce real, shareable diffs (viewer URL, file artifact, or both) instead of manual edit summaries.
YAGNI and minimal diffs inside Fantasia mandatory structure: reuse ladder, no unrequested features or deps, shortest change that passes gates.
GPL-3.0Auto-check passed
Install Fantasia Yagni
$ npx skills add vishiri/fantasia-archive --skill fantasia-yagni -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install vishiri/fantasia-archive fantasia-yagni --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/vishiri/fantasia-archive.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.cursor/skills/fantasia-yagni .claude/skills/fantasia-yagni && rm -rf skills-srcUse ~/.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/
Install the "fantasia-yagni" agent skill from https://github.com/vishiri/fantasia-archive/tree/master/.cursor/skills/fantasia-yagni into .claude/skills/fantasia-yagni/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fantasia-yagni", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/vishiri/fantasia-archive/tree/master/.cursor/skills/fantasia-yagniType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add vishiri/fantasia-archive --skill fantasia-yagni -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install vishiri/fantasia-archive fantasia-yagni --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vishiri/fantasia-archive.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.cursor/skills/fantasia-yagni .agents/skills/fantasia-yagni && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "fantasia-yagni" agent skill from https://github.com/vishiri/fantasia-archive/tree/master/.cursor/skills/fantasia-yagni into .agents/skills/fantasia-yagni/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fantasia-yagni", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add vishiri/fantasia-archive --skill fantasia-yagni -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install vishiri/fantasia-archive fantasia-yagni --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vishiri/fantasia-archive.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.cursor/skills/fantasia-yagni .cursor/skills/fantasia-yagni && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "fantasia-yagni" agent skill from https://github.com/vishiri/fantasia-archive/tree/master/.cursor/skills/fantasia-yagni into .cursor/skills/fantasia-yagni/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fantasia-yagni", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/vishiri/fantasia-archive.git --path .cursor/skills/fantasia-yagni--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add vishiri/fantasia-archive --skill fantasia-yagni -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install vishiri/fantasia-archive fantasia-yagni --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vishiri/fantasia-archive.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.cursor/skills/fantasia-yagni .gemini/skills/fantasia-yagni && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "fantasia-yagni" agent skill from https://github.com/vishiri/fantasia-archive/tree/master/.cursor/skills/fantasia-yagni into .gemini/skills/fantasia-yagni/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fantasia-yagni", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install vishiri/fantasia-archive fantasia-yagniInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add vishiri/fantasia-archive --skill fantasia-yagni -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/vishiri/fantasia-archive.git skills-src && mkdir -p .github/skills && cp -r skills-src/.cursor/skills/fantasia-yagni .github/skills/fantasia-yagni && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "fantasia-yagni" agent skill from https://github.com/vishiri/fantasia-archive/tree/master/.cursor/skills/fantasia-yagni into .github/skills/fantasia-yagni/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fantasia-yagni", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add vishiri/fantasia-archive --skill fantasia-yagni -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install vishiri/fantasia-archive fantasia-yagni --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vishiri/fantasia-archive.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.cursor/skills/fantasia-yagni .opencode/skills/fantasia-yagni && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "fantasia-yagni" agent skill from https://github.com/vishiri/fantasia-archive/tree/master/.cursor/skills/fantasia-yagni into .opencode/skills/fantasia-yagni/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fantasia-yagni", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
fantasia-yagni- GitHub stars
- 409
- Token cost
- ~474 tokens
- SKILL.md length
- 149 words
- Files
- 1
- Skills in repo
- 35
- Repo updated
- First seen
- Licence
- GPL-3.0
At a glance
YAGNI and minimal diffs inside Fantasia mandatory structure: reuse ladder, no unrequested features or deps, shortest change that passes gates.
- Works in 5 steps: Need build at all? → Already in codebase? → Stdlib / platform? → …
- SKILL.md covers When to follow, Ladder (summary), Orthogonal to caveman and Links
- Calls yarn
What it does
Fantasia Yagni is an agent skill from vishiri/fantasia-archive. YAGNI and minimal diffs inside Fantasia mandatory structure: reuse ladder, no unrequested features or deps, shortest change that passes gates. Apply when scoping work, reviewing bloat, or choosing reuse vs greenfield.
Its SKILL.md is about 470 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: A world-builder's best friend! The licence is GPL-3.0.
Example prompts
- “/fantasia-yagni”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Need build at all?
- Already in codebase?
- Stdlib / platform?
- Installed package.json dep?
- Minimum inside conventions — shortest diff passing dev scoped gate (dev-scoped-verify.mdc); full yarn testbatch:verify at commit/final…
What it can do on your machine
Read from SKILL.md and the folder at commit 26d4648. 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
Shell commands in SKILL.md call:
yarn
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use yarn, which can reach the network depending on how they are called.
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
Fantasia Yagni loads about 474 tokens when it runs. Until then it costs about 58 tokens; SKILL.md has 149 words of instructions outside code blocks.
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 vishiri/fantasia-archive at commit 26d4648, republished under its GPL-3.0 licence (© vishiri). 149 words, ~474 tokens.
Download SKILL.mdSave it as
.claude/skills/fantasia-yagni/SKILL.md (or your agent's skills folder).- name
- fantasia-yagni
- description
- YAGNI and minimal diffs inside Fantasia mandatory structure: reuse ladder, no unrequested features or deps, shortest change that passes gates. Apply when scoping work, reviewing bloat, or choosing reuse vs greenfield.
YAGNI — implementation discipline
When to follow
- New feature, refactor, or dependency choice
- User request sounds heavy — check reuse first
- Diff review: duplicate util, speculative abstraction, parallel pattern
Always-on rule: yagni.mdc. Precedence: other .cursor/rules/* and fantasia-* skills win on structure, tests, i18n, gates.
Ladder (summary)
- Need build at all?
- Already in codebase?
- Stdlib / platform?
- Installed
package.jsondep? - Minimum inside conventions — shortest diff passing dev scoped gate (dev-scoped-verify.mdc); full
yarn testbatch:verifyat commit/final cleanup
Trace real flow before picking rung. Grep callers, then Read. Mandatory two-level, types/, Vitest/Playwright/Storybook, neverthrow, line caps — not skippable for brevity.
Orthogonal to caveman
| Layer | Rule / skill | Job |
|---|---|---|
| Replies | caveman-default.mdc, .agents/skills/caveman/ | Terse agent prose |
| Code | yagni.mdc | Minimal correct implementation |
Both can stay on. YAGNI does not replace caveman or cavemem hooks.
Links
- code-size-decomposition.mdc — fewer modules until line caps force split
- fa-two-level-architecture.mdc
- fantasia-dev-scoped-verify — default post-edit gate
- fantasia-testing — connected tests + full gate at ship
© vishiri, GPL-3.0. 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 .cursor/skills/fantasia-yagni of vishiri/fantasia-archive.
Open the folder on GitHubat commit 26d4648
Compare with similar skills
Fantasia Yagni 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Fantasia Yagni this skillvishiri/fantasia-archive | 409 | — | ~474 | Automated safety check: Pass | GPL-3.0 | |
| Diffsopenclaw/openclaw | 392k | 4 repos | ~461 | Automated safety check: Pass | MIT | |
| Minimalismsickn33/agentic-awesome-skills | 47k | 1 repos | ~2.2k | Automated safety check: Pass | MIT | |
| Minimal Code DisciplineYeachan-Heo/oh-my-claudecode | 40k | — | ~746 | Automated safety check: Pass | MIT | |
| Accesslint Diffsickn33/agentic-awesome-skills | 47k | 1 repos | ~1.2k | Automated safety check: Pass | MIT | |
| Diff Reviewnexu-io/open-design | 100k | — | ~508 | Automated safety check: Pass | Apache-2.0 |
Similar skills
Minimalism
sickn33/agentic-awesome-skills
Web and App implementation guide for the Minimalism design style.
Minimal Code Discipline
Yeachan-Heo/oh-my-claudecode
A YAGNI-style checklist for planning and writing code changes: skip what is not needed, reuse what exists and ship the shortest correct diff.
Accesslint Diff
sickn33/agentic-awesome-skills
Diff a live page's accessibility violations against a baseline — by default compares uncommitted changes (stash-based), or pass --branch [<name] to diff against a branch.
Diff Review
nexu-io/open-design
Render the patch-edit run's accumulated changes as a reviewable diff, surface it through a GenUI choice surface, and persist the user's accept / reject decision into the artifact manifest.
Diff Analyze
ruvnet/ruflo
Analyze git diffs for risk scoring, reviewer recommendations, and change classification.
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Questions about Fantasia Yagni
What does Fantasia Yagni do?
YAGNI and minimal diffs inside Fantasia mandatory structure: reuse ladder, no unrequested features or deps, shortest change that passes gates. Fantasia Yagni is an agent skill from vishiri/fantasia-archive. YAGNI and minimal diffs inside Fantasia mandatory structure: reuse ladder, no unrequested features or deps, shortest change that passes gates.
How do I install Fantasia Yagni in Claude Code?
Run `npx skills add vishiri/fantasia-archive --skill fantasia-yagni -a claude-code`. Or copy the skill folder (.cursor/skills/fantasia-yagni in vishiri/fantasia-archive) into .claude/skills/fantasia-yagni in your project. Claude Code loads it when a task matches its description.
How do I install Fantasia Yagni in Codex?
Run `npx skills add vishiri/fantasia-archive --skill fantasia-yagni -a codex`. Or copy the skill folder (.cursor/skills/fantasia-yagni in vishiri/fantasia-archive) into .agents/skills/fantasia-yagni in your project. Codex loads it when a task matches its description.
Can I use Fantasia Yagni 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 vishiri/fantasia-archive --skill fantasia-yagni -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/fantasia-yagni, .gemini/skills/fantasia-yagni, .github/skills/fantasia-yagni and .opencode/skills/fantasia-yagni in your project.
What does Fantasia Yagni need to run?
Going by SKILL.md and its folder, Fantasia Yagni needs the command-line tools its instructions call (yarn).
Does Fantasia Yagni 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 Fantasia Yagni 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 Fantasia Yagni use?
Fantasia Yagni is published under the GPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Fantasia Yagni use?
About 474 tokens (SKILL.md is roughly 1.9k 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 Fantasia Yagni?
Skills that share tags, products or a category with Fantasia Yagni: Diffs (openclaw/openclaw, 392k stars), Minimalism (sickn33/agentic-awesome-skills, 47k stars), Minimal Code Discipline (Yeachan-Heo/oh-my-claudecode, 40k stars) and Accesslint Diff (sickn33/agentic-awesome-skills, 47k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Fantasia Yagni?
vishiri (a GitHub user) maintains it in vishiri/fantasia-archive, which has 409 GitHub stars. The repository holds 35 skills in this directory. The repository was last updated on October 7, 2026.
Source: vishiri/fantasia-archive on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.