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FylloCode: Skill for Claude Code

.agents/skills/diagram-design/SKILL.md

diagram-design is a skill for Claude Code, Codex from Fioooooooo/FylloCode. It costs 188 tokens per session (10,472 once invoked), scanned A, a copy of diagram-design, MIT.

A guide for creating architecture and data diagrams as standalone HTML files with inline SVG and CSS. It covers diagrams such as flowcharts, timelines, state machines, charts, and organizational trees.

In plain words
What is it for?
Use it when producing branded technical diagrams, including system architecture, process flows, data models, timelines, and charts.
Why use it?
It provides rules for choosing diagram layouts and checking the project’s visual style settings before creating a diagram.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is Fioooooooo/FylloCode's own configuration. It tells Claude Code and Codex how to work on FylloCode itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything FylloCode configures →

not rated 28repo 1mo ago A scan 188 tokens copy · 91% MIT
View source ↗ Fioooooooo/FylloCode fyllocode.cc
Reuse

Borrowing it

Nothing to install: this file belongs to Fioooooooo/FylloCode. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Fioooooooo/FylloCode/main/.agents/skills/diagram-design/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/Fioooooooo/FylloCode

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for diagram-design

README.md
[![agentmods](https://agentmods.dev/badge/skills/fioooooooo/fyllocode/diagram-design/github.svg)](https://agentmods.dev/skills/fioooooooo/fyllocode/diagram-design)
Your own site
<a href="https://agentmods.dev/skills/fioooooooo/fyllocode/diagram-design"><img src="https://agentmods.dev/badge/skills/fioooooooo/fyllocode/diagram-design/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for diagram-design

Your own site · 80×15
<a href="https://agentmods.dev/skills/fioooooooo/fyllocode/diagram-design"><img src="https://agentmods.dev/badge/skills/fioooooooo/fyllocode/diagram-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 188 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 10,472 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 91% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00188 $0.10472
Opus 5.5 $0.00075 $0.04189
Sonnet 5.5 $0.00038 $0.02094
Haiku 4.5 $0.00019 $0.01047

Measured 2mo ago against content hash 55ebc5bc0f13, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

diagram-design scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

91% identical to diagram-design — 514 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.agents/skills/diagram-design/SKILL.md · 589 lines

How it starts

The opening of the file, as written. The whole thing — 589 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Diagram Design

Create visual diagrams as self-contained HTML files with inline SVG and CSS, following an opinionated editorial design system.

Thirty-nine visual types. Semantic patterns describe behavior independently; type references describe layout. Details load from references/ only when selected.

0. First-time setup — style guide gate

Before generating your first diagram in a new project, verify the style guide has been customized.

Don't silently ship default-skinned diagrams into a branded project.

First check the project root for a .diagram-design marker and resolve it per references/profiles.md. A valid marker whose profile exists selects that file directly and skips this gate; profile: default also skips it. A malformed or missing-profile marker follows the visible failure handling in that reference. Never copy a marker-selected profile over the installed working copy.

Open references/style-guide.md and check the default tokens. If they're still the shipped defaults (paper #f5f5f5, ink #2d3142, accent #eb6c36 atomic-tangerine), pause and ask the user:

"This is your first diagram in this project. The style guide is still at the default (neutral white-smoke + atomic-tangerine). Do you want to customize it to match your brand first? Options: (a) pull from your website URL, (b) extract from an installed skill, (c) extract from a local folder / design-system directory, (d) paste tokens manually, (e) proceed with the default for now, (f) load a saved client profile."

Then branch per the matching section of references/onboarding.md; for (f) follow references/profiles.md.

Once the style guide has been customized (or the user explicitly opted for default), skip this gate on subsequent runs. A leading profile header names the copied-in active profile. Without a header, any semantic-role value or typography family differing from shipped defaults means custom-unsaved: skip the gate and offer to save it as a profile. All-default tokens with no marker/header trigger the gate. At the end of every onboarding method, offer to save the result as a named client profile per references/profiles.md.

Read the full file on GitHub · 589 lines

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 589 lines · 188 tokens per session scan A 55ebc5bc0f13

Subscribe to this mod's changes

diagram-design is a skill published in the GitHub repository Fioooooooo/FylloCode (28 stars, last pushed 1mo ago), licensed MIT. It adds 188 tokens to every session and 10,472 once invoked, about $0.0008 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 91% identical to diagram-design, differing in 514 lines, and is treated as a copy.

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