Arness Use Cases Teams Agent Skill

This skill should be used when the user says "use cases teams", "arn use cases teams", "team use cases", "debate use cases"…

Context cost
11.1k tokensestimated from the bundle, loaded when it triggers
Bundle
3 files · 44.5 kBtext throughout, nothing executable
Licence
MITthe author’s own terms
Last change
—v1.0.0
Servers it uses
Noneruns standalone

What it does

This skill should be used when the user says "use cases teams", "arn use cases teams", "team use cases", "debate use cases", "collaborative use cases", "use cases with debate", "team-based use case review", "use case debate", "review use cases as a team", or wants to create structured use case documents through expert debate where product strategist and UX specialist review and discuss each other's findings before revising, producing a use-cases/ directory with individual Cockburn fully-dressed use case files and a README index.

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.

content

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.md21.8 kB · preview
--- name: arn-spark-use-cases-teams version: 1.0.0 ---
15# Arness Use Cases Teams
16
17Create structured use case documents in Cockburn fully-dressed format through a team debate process. The arn-spark-use-case-writer agent drafts, then arn-spark-product-strategist and arn-spark-ux-specialist (greenfield agents in this plugin) engage in a structured debate -- reviewing each other's findings, agreeing, disagreeing, and surfacing insights neither would find alone. Supports Agent Teams for parallel debate or sequential simulation as fallback. If arn-spark-ux-specialist is unavailable, the skill falls back to single-reviewer mode with product strategist only. This is a conversational skill that runs in normal conversation (NOT plan mode).
18
19This is an alternative to arn-spark-use-cases (independent sequential review). Use this when the project has enough complexity that expert debate adds value -- multiple actors, many use cases, or business rules that benefit from cross-disciplinary scrutiny. For simpler projects or lower token budgets, use /arn-spark-use-cases instead.
20
21The primary artifacts are a **use-cases/ directory** at the project root containing individual use case files (UC-NNN-title.md) and a **README.md** index -- the same output format as /arn-spark-use-cases. Additionally, mandatory **per-round debate reports** are saved to use-cases/reviews/.
22
23## Prerequisites
24
25Same prerequisites as /arn-spark-use-cases. Check in order:
26
27Determine the use cases output directory:
281. Read the project's CLAUDE.md and check for a ## Arness section
292. If found, extract the configured Use cases directory path — this is the source of truth
303. If no ## Arness section exists or Arness Spark fields are missing, inform the user: "Arness Spark is not configured for this project yet. Run /arn-brainstorming to get started — it will set everything up automatically." Do not proceed without it.
314. If the directory does not exist, create it
32
33> All references to use-cases/ in this skill refer to the configured use cases directory determined above.
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md3,062 words
Files3
LicenceMIT
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.

≈160
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
10,965
on trigger
The instruction body and 2 supporting files, read only when the skill fires.
5.6%
of a 200k window
Ten skills this size would take about 56% of the window before you open a file.
050k100k150k200k context window

11.1k 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

3 files, 44.5 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md21.8 kB
  • references/debate-protocol.md17.5 kB
  • references/review-report-template.md5.2 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 3 files you can review in full before installing. The MIT 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.

# Arness Use Cases Teams · 11.1k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/arness-use-cases-teams/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/arness-use-cases-teams" ] && { [ ! -e .claude/skills/arness-use-cases-teams ] || { mv .claude/skills/arness-use-cases-teams "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/arness-use-cases-teams" .claude/skills/ && echo "Installed .claude/skills/arness-use-cases-teams"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add appsvortex/arness-use-cases-teams

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/arness-use-cases-teams/ 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/arness-use-cases-teams/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/arness-use-cases-teams" ] && { [ ! -e ~/.claude/skills/arness-use-cases-teams ] || { mv ~/.claude/skills/arness-use-cases-teams "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/arness-use-cases-teams" ~/.claude/skills/ && echo "Installed ~/.claude/skills/arness-use-cases-teams" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/arness-use-cases-teams/ 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. It appears as arn-spark-use-cases-teams in Gemini CLI, Codex, Copilot and Grok (its own name); Claude Code lists it by the folder name, arness-use-cases-teams.

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
Version1.0.0
Publishedno release date on file
PriceFree
Referenceappsvortex/arness-use-cases-teams

Versions

v1.0.0 is what is on the shelf; no release here carries a date. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

v1.0.0
  • No earlier releases have been published to the marketplace.
Pinning

The install command always fetches the release that is current the day you run it — v1.0.0 today — and cannot ask for an earlier one. The copy on your disk does not change until you run it again.

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