fusion-tea: Skill for Claude Code

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

design-model is a skill for Claude Code from 1cFE/fusion-tea. It costs 18 tokens per session (796 once invoked), scanned A, original, MIT.

A tool for writing a structured design document for SysML v2 models. SysML v2 is a language for describing the structure and behavior of engineered systems; the skill also covers prototyping and checking the design.

In plain words
What is it for?
Use it to define a model's design, create a prototype, and validate the design decisions.
Why use it?
It turns an early system idea into a documented design that can be tried and checked before full implementation.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: names the AskUserQuestion tool; mentions Claude Code; installed under .agents/ (shared by several agents).

This is 1cFE/fusion-tea's own configuration. It tells Claude Code how to work on fusion-tea 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 fusion-tea configures →

Reuse

Borrowing it

Nothing to install: this file belongs to 1cFE/fusion-tea. 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/1cFE/fusion-tea/main/.agents/skills/design-model/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/1cFE/fusion-tea

Made for: Claude Code.

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 design-model

README.md
[![agentmods](https://agentmods.dev/badge/skills/1cfe/fusion-tea/design-model/github.svg)](https://agentmods.dev/skills/1cfe/fusion-tea/design-model)
Your own site
<a href="https://agentmods.dev/skills/1cfe/fusion-tea/design-model"><img src="https://agentmods.dev/badge/skills/1cfe/fusion-tea/design-model/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 design-model

Your own site · 80×15
<a href="https://agentmods.dev/skills/1cfe/fusion-tea/design-model"><img src="https://agentmods.dev/badge/skills/1cfe/fusion-tea/design-model.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 18 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 796 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 original No closer match found 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 $0.00018 $0.00796
Opus 5.5 $0.00007 $0.00318
Sonnet 5.5 $0.00004 $0.00159
Haiku 4.5 $0.00002 $0.00080

Measured 24d ago against content hash ff8a4bf7b944, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

design-model 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 24d 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.

.agents/skills/design-model/SKILL.md · 44 lines

How it starts

The opening of the file, as written. The whole thing — 44 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Before executing this skill, read .agentic-mbse/claude.md in Claude Code or .agentic-mbse/codex.md in Codex. Resolve supporting paths from this skill’s installed directory; keep generated outputs in the project or a temporary directory. Read referenced skills from .agents/skills/<name>/SKILL.md when their guidance is needed.

Design Model

Use “Process Selection” in modeling_project/MODELING_PROCESS.md. This stage may be brief or skipped when its responsibility is already satisfied. For a bounded tracked change, use sections in the existing spec.md instead of creating separate design/plan documents; retain required native metadata. The instructions below describe a separate artifact when it is useful.

Explain the system architecture and dependencies needed to meet spec.md. Write work/active/{WI-XXX}_{name}/design.md; retain Status, Created, Updated, and Related Artifacts metadata.

Understand the Affected System

For direct entry, inspect knowledge/SOURCE_INDEX.md and knowledge/KNOWLEDGE.md for relevant authority and insights unless discovery is already current. Read the spec and the “MBSE Methodology: Four Integrated Views” and “Architecture & Design” sections of modeling_project/MODELING_PROCESS.md. Use its technical-pattern table to read the references relevant to changed constructs, especially calculation placement and input binding. Read relevant architecture decisions, model definitions, consumers, and cited source evidence. Explain the physical components, responsibilities, interfaces, and operating behavior involved in the change, then relate them to the analysis. Inspect inherited structure as well as the local file.

Identify where shared quantities are owned and how consumers obtain them. Make physical structure and analytical dependencies consistent enough to inspect and check. Choose structural depth and SysML mechanisms where they clarify or constrain the intended model; additional declarations that carry no useful meaning are not the objective.

Read the full file on GitHub · 44 lines

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. 24d ago Changed · -8 lines ff8a4bf7b944
  2. 1mo ago First seen · 52 lines · 18 tokens per session scan A 191f2576bd92

Subscribe to this mod's changes

design-model is a skill published in the GitHub repository 1cFE/fusion-tea (5 stars, last pushed 24d ago), licensed MIT. It adds 18 tokens to every session and 796 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-29.

Related

design-model compared with skills from other repositories

design-model next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
design-model1cFE/fusion-teaSkill524d agoMITA18Claude Code
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matlabK-Dense-AI/scientific-agent-skillsSkill56k4d agoMITA44Claude Code
phylogeneticsK-Dense-AI/scientific-agent-skillsSkill56k4d agoMITA71Claude Code, Codex
research-engineerdavila7/claude-code-templatesSkill33kyesterdayMITA43Claude Code, Codex
mapping-to-snomedmaziyarpanahi/openmedSkill5.8kyesterdayApache-2.0A205Claude Code