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Agent skill

Form Follows Function Success Criteria

by hashgraph-online in hashgraph-online/awesome-codex-plugins

A skill your agent uses when the team is in a form-vs-function debate and needs to step back to define what "success" actually means for the design.

Apache-2.0Auto-check passed

Install Form Follows Function Success Criteria

skills CLI
$ npx skills add hashgraph-online/awesome-codex-plugins --skill form-follows-function-success-criteria -a claude-code

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

GitHub CLI
$ gh skill install hashgraph-online/awesome-codex-plugins form-follows-function-success-criteria --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/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/HDeibler/universal-design-principles/plugins/aesthetics-and-emotion-principles/skills/form-follows-function-success-criteria .claude/skills/form-follows-function-success-criteria && 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
form-follows-function-success-criteria
GitHub stars
1.3k
Token cost
~1.2k tokens
SKILL.md length
518 words
Files
2 (incl. references)
Skills in repo
716
Repo updated
First seen
Licence
Apache-2.0

At a glance

A skill your agent uses when the team is in a form-vs-function debate and needs to step back to define what "success" actually means for the design.

  • Works in 4 steps: List the criteria the design should serve. → Rank them by priority for this specific… → For each candidate design choice,… → …
  • The team is in a form-vs-function debate and needs to step back to define what success actually means for the design
  • SKILL.md covers Common implicit success criteria, Naming success criteria, A team exercise and Worked example, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Form Follows Function Success Criteria is an agent skill from hashgraph-online/awesome-codex-plugins. Use this skill when the team is in a form-vs-function debate and needs to step back to define what "success" actually means for the design. Trigger when stakeholders disagree about visual treatment, when a design feels off and no one can articulate why, or when reviewing a design against an unclear brief. Sub-aspect of form-follows-function; read that first.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/criteria-frameworks.md`).

The repository describes itself as: A curated list of awesome OpenAI Codex / ChatGPT plugins, skills, and resources. The 1 Codex Marketplace. See live plugins at: https://hol.org/plugins/best-codex-plugins. The licence is Apache-2.0.

When your agent uses it

  • The team is in a form-vs-function debate and needs to step back to define what success actually means for the design
  • Stakeholders disagree about visual treatment
  • A design feels off and no one can articulate why
  • Reviewing a design against an unclear brief

Example prompts

  • “success”
  • “/form-follows-function-success-criteria”

Workflow steps

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

  1. List the criteria the design should serve.
  2. Rank them by priority for this specific surface.
  3. For each candidate design choice, evaluate against the top 2–3 criteria.
  4. Pick the choice that does best on top criteria; accept trade-offs on lower ones.

What it can do on your machine

Read from SKILL.md and the folder at commit 3e1456a. 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

Form Follows Function Success Criteria loads about 1.2k tokens when it runs, and up to ~1.6k if it reads all its reference files. Until then it costs about 100 tokens; SKILL.md has 518 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~100
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.6k

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 hashgraph-online/awesome-codex-plugins at commit 3e1456a, republished under its Apache-2.0 licence (© hashgraph-online). 518 words, ~1,186 tokens.

Download SKILL.mdSave it as .claude/skills/form-follows-function-success-criteria/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
form-follows-function-success-criteria
description
Use this skill when the team is in a form-vs-function debate and needs to step back to define what "success" actually means for the design. Trigger when stakeholders disagree about visual treatment, when a design feels off and no one can articulate why, or when reviewing a design against an unclear brief. Sub-aspect of `form-follows-function`; read that first.

Defining success criteria explicitly

The book's reframe of form-follows-function: instead of asking "what should be omitted?", ask "what's critical to this design's success?". Then weigh form and function against those criteria. The discipline is making success criteria explicit rather than assuming.

Common implicit success criteria

Without explicit criteria, teams default to assumed criteria — often without alignment:

  • Designer assumes: visual elegance.
  • Engineer assumes: implementation simplicity.
  • Product manager assumes: feature completeness.
  • Marketing assumes: brand differentiation.
  • Stakeholder assumes: stakeholder approval.

When the assumed criteria differ, every design decision becomes contentious. Explicit criteria make decisions defensible.

Naming success criteria

For a given design, candidates include:

  • User performance (speed, accuracy, error rate).
  • User satisfaction / preference.
  • Business outcomes (conversion, retention, revenue).
  • Brand differentiation (does this look unmistakably like us?).
  • Accessibility / inclusion.
  • Implementation simplicity / cost.
  • Long-term maintainability.
  • Aesthetic / emotional response.

Most designs serve multiple criteria; the question is which dominate when they conflict.

A team exercise

For a design in dispute:

  1. List the criteria the design should serve.
  2. Rank them by priority for this specific surface.
  3. For each candidate design choice, evaluate against the top 2–3 criteria.
  4. Pick the choice that does best on top criteria; accept trade-offs on lower ones.

This conversation surfaces hidden disagreements about what the design is for. Resolving those usually resolves the surface debates.

Worked example

A landing-page hero section is in dispute. Designer wants minimalist (one headline, one CTA); marketing wants rich (headline, deck, three feature bullets, social proof, primary + secondary CTA).

Without explicit criteria, the debate is irresolvable. Each side has a defensible position.

With explicit criteria:

  • Conversion rate: rich variants tend to convert better in A/B tests for new visitors. Marketing's position favored.
  • Brand differentiation: minimalist often differentiates better in cluttered spaces. Designer's position favored.
  • Mobile experience: minimalist tends to perform better on small screens. Designer's position favored.

If conversion rate is the dominant criterion, marketing wins this round; ship rich and A/B test. If brand differentiation is dominant, designer wins. The criteria choice resolves the debate.

Show full SKILL.md (186 more words)Show less

When form genuinely competes with function

Some legitimate trade-offs:

  • Visual polish vs. load time — animations, large images cost performance.
  • Brand differentiation vs. convention adherence — distinctive design departs from familiar patterns.
  • Aesthetic minimalism vs. discoverability — fewer visible elements = harder to find features.
  • Custom vs. native components — custom looks distinctive but is more expensive and risks accessibility.

Each trade-off should be made deliberately, with success criteria informing the choice.

Anti-patterns

  • Implicit criteria. Each team member assumes different criteria; debates are unresolvable.
  • All-criteria-must-be-served. Trying to optimize for everything produces designs that serve nothing well.
  • Designer-as-arbiter. "I'm the designer, so I get to decide" — without explicit criteria, this is unconvincing.
  • Stakeholder-as-arbiter. "The CEO likes it" — same problem.

Heuristics

  1. The criteria-naming exercise. Before designing, list and rank success criteria. Get team alignment.
  2. The trade-off-explicitness check. When trading off, name what's being sacrificed. "We're sacrificing brand differentiation for convention adherence."
  3. The dominant-criterion test. When stuck, ask: which criterion matters most for this surface (not in general)? That answer often resolves.
  • form-follows-function (parent).
  • form-follows-function-as-axiom — the descriptive interpretation.
  • hierarchy-of-needs (interaction) — Maslow-derived ordering of design needs.
  • flexibility-usability-tradeoff — explicit trade-off framing.

© hashgraph-online, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in plugins/HDeibler/universal-design-principles/plugins/aesthetics-and-emotion-principles/skills/form-follows-function-success-criteria of hashgraph-online/awesome-codex-plugins.

  • SKILL.md
  • references/criteria-frameworks.md

Open the folder on GitHubat commit 3e1456a

Compare with similar skills

Form Follows Function Success Criteria 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.

Form Follows Function Success Criteria compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Form Follows Function Success Criteria this skillhashgraph-online/awesome-codex-plugins1.3k—~1.2kAutomated safety check: PassApache-2.0
Form Fillingasgeirtj/system_prompts_leaks69k—~400Automated safety check: PassCC0-1.0
Form Validationthedaviddias/Front-End-Checklist74k—~633Automated safety check: PassMIT
Formstrycompai/comp2k—~1kAutomated safety check: PassAGPL-3.0
Form Httpsthedaviddias/Front-End-Checklist74k—~552Automated safety check: PassMIT
Form Captchathedaviddias/Front-End-Checklist74k—~601Automated safety check: PassMIT

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Questions about Form Follows Function Success Criteria

What does Form Follows Function Success Criteria do?

A skill your agent uses when the team is in a form-vs-function debate and needs to step back to define what "success" actually means for the design. Form Follows Function Success Criteria is an agent skill from hashgraph-online/awesome-codex-plugins. Use this skill when the team is in a form-vs-function debate and needs to step back to define what "success" actually means for the design.

When should I use Form Follows Function Success Criteria?

Form Follows Function Success Criteria fits situations like: the team is in a form-vs-function debate and needs to step back to define what success actually means for the design; stakeholders disagree about visual treatment; A design feels off and no one can articulate why; reviewing a design against an unclear brief.

How do I install Form Follows Function Success Criteria in Claude Code?

Run `npx skills add hashgraph-online/awesome-codex-plugins --skill form-follows-function-success-criteria -a claude-code`. Or copy the skill folder (plugins/HDeibler/universal-design-principles/plugins/aesthetics-and-emotion-principles/skills/form-follows-function-success-criteria in hashgraph-online/awesome-codex-plugins) into .claude/skills/form-follows-function-success-criteria in your project. Claude Code loads it when a task matches its description.

How do I install Form Follows Function Success Criteria in Codex?

Run `npx skills add hashgraph-online/awesome-codex-plugins --skill form-follows-function-success-criteria -a codex`. Or copy the skill folder (plugins/HDeibler/universal-design-principles/plugins/aesthetics-and-emotion-principles/skills/form-follows-function-success-criteria in hashgraph-online/awesome-codex-plugins) into .agents/skills/form-follows-function-success-criteria in your project. Codex loads it when a task matches its description.

Can I use Form Follows Function Success Criteria 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 hashgraph-online/awesome-codex-plugins --skill form-follows-function-success-criteria -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/form-follows-function-success-criteria, .gemini/skills/form-follows-function-success-criteria, .github/skills/form-follows-function-success-criteria and .opencode/skills/form-follows-function-success-criteria in your project.

What does Form Follows Function Success Criteria need to run?

SKILL.md names no scripts, command-line tools or credentials: Form Follows Function Success Criteria is instructions for the agent only.

Does Form Follows Function Success Criteria 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 Form Follows Function Success Criteria 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 Form Follows Function Success Criteria use?

Form Follows Function Success Criteria is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Form Follows Function Success Criteria use?

About 1.2k tokens (SKILL.md is roughly 4.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 424 tokens, read only when the agent opens those files.

What are the alternatives to Form Follows Function Success Criteria?

Skills that share tags, products or a category with Form Follows Function Success Criteria: Form Filling (asgeirtj/system_prompts_leaks, 69k stars), Form Validation (thedaviddias/Front-End-Checklist, 74k stars), Forms (trycompai/comp, 2k stars) and Form Https (thedaviddias/Front-End-Checklist, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Form Follows Function Success Criteria?

hashgraph-online (a GitHub organization) maintains it in hashgraph-online/awesome-codex-plugins, which has 1,267 GitHub stars. The repository holds 716 skills in this directory. The repository was last updated on October 10, 2026.

Source: hashgraph-online/awesome-codex-plugins on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.