Form Follows Function Agent Skill

Use this skill when designing the visual or aesthetic layer of a product, deciding between expressive style and functional restraint…

Context cost
4k tokensestimated from the bundle, loaded when it triggers
Bundle
2 files · 16.0 kBtext throughout, nothing executable
Licence
Apache-2.0the author’s own terms
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Use this skill when designing the visual or aesthetic layer of a product, deciding between expressive style and functional restraint, evaluating decorative elements, or arguing about whether a feature should ship plain vs. polished. Trigger when stakeholders ask "should we add visual flair to this?", when reviewing a design that "feels too decorated," or when picking between competing visual directions.

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

design
Filed under

Design & Media

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md13.1 kB · preview
--- name: form-follows-function ---
6# Form Follows Function
7
8The phrase "form follows function" is one of the most-quoted in design — and one of the most variously interpreted. The book makes a useful distinction: the *descriptive* version observes that beautiful design tends to result from purity of function (without ornament for its own sake); the *prescriptive* version asserts that aesthetic considerations should be subordinate to functional ones. The descriptive version is usually right; the prescriptive version, taken too literally, produces designs that achieve their function but fail at being chosen.
9
10## Definition (in our own words)
11
12The principle holds that beauty in design results when the visible form derives clearly from the function the design serves. A well-engineered tool tends to be visually compelling because every visible feature has a purpose; arbitrary decoration tends to feel hollow because nothing earns its presence. The book's key clarification: this is descriptively useful (form often does follow function in good design), but not prescriptively reliable (you can't simply minimize ornamentation and expect to land on the best design — sometimes function and aesthetics genuinely trade off, and sometimes purely aesthetic choices serve the design's larger success).
13
14## Origins and research lineage
15
16- **Carlo Lodoli** (18th-century Italian Jesuit monk) is often credited as the original articulator. His architectural theories influenced later thinkers.
17- **Horatio Greenough** and **Louis Sullivan** popularized the phrase in the late 19th century. Sullivan's article "The Tall Office Building Artistically Considered" (*Lippincott's Magazine*, March 1896) framed it as the principle for the new skyscraper era: form should follow function rather than imitate prior styles.
18- **The Modernist movement** (early 20th century) — Bauhaus, International Style, mid-century industrial design — treated form-follows-function as a guiding doctrine. The result was an enormous body of work that influenced visual culture broadly.
19- **Peter Blake**, *Form Follows Fiasco: Why Modern Architecture Hasn't Worked* (Little, Brown, 1977). A counter-critique: pure form-follows-function modernism produced buildings users hated and societies couldn't sustain. Pure prescriptive interpretation has failure modes.
20- **Lidwell, Holden & Butler** (2003) compactly distinguished the two interpretations and noted that the prescriptive version focuses the designer on the wrong question ("what aspects of form should be omitted?") instead of the right one ("what aspects of the design are critical to success?").
21
22## Why this principle matters
23
24The descriptive insight is real and powerful: when every visible element of a design has a purpose, the design tends to feel honest, coherent, and timeless. Decoration without function tends to feel hollow, dated, or dishonest. Many of the most-admired designs (Apple's industrial design, Braun's appliances, Eames furniture, Helvetica typography) embody this descriptively.
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md1,786 words
Files2
LicenceApache-2.0
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈180
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
3,820
on trigger
The instruction body and 1 supporting file, read only when the skill fires.
2.0%
of a 200k window
Ten skills this size would take about 20% of the window before you open a file.
050k100k150k200k context window

4k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

2 files, 16.0 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md13.1 kB
  • references/sullivan-bauhaus-modernism.md2.9 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 2 files you can review in full before installing. The Apache-2.0 licence covers the templates and examples as well as the instructions.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# Form Follows Function · 4k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/form-follows-function/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/form-follows-function" ] && { [ ! -e .claude/skills/form-follows-function ] || { mv .claude/skills/form-follows-function "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/form-follows-function" .claude/skills/ && echo "Installed .claude/skills/form-follows-function"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add hashgraph-online/form-follows-function

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/form-follows-function/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/form-follows-function/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/form-follows-function" ] && { [ ! -e ~/.claude/skills/form-follows-function ] || { mv ~/.claude/skills/form-follows-function "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/form-follows-function" ~/.claude/skills/ && echo "Installed ~/.claude/skills/form-follows-function" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/form-follows-function/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Versionnot versioned
Publishedno release date on file
PriceFree
Referencehashgraph-online/form-follows-function

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

Reviews

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Publisher
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