Datasets Agent Skill

Understand what a Phoenix dataset is and reason well about its examples, outputs, splits, and how it feeds evaluators and experiments.

Context cost
1.6k tokensestimated from the bundle, loaded when it triggers
Bundle
1 file · 6.5 kBtext throughout, nothing executable
Licence
not declarednone named by its author
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Understand what a Phoenix dataset is and reason well about its examples, outputs, splits, and how it feeds evaluators and experiments. Load this whenever a dataset is in view or the user asks what a dataset is, how splits work, what an output "means", or how datasets relate to experiments and evals. This skill governs the judgment; any tool descriptions govern the mechanics.

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.

data science

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.md6.5 kB · preview
--- name: datasets summary: Reason well about Phoenix datasets — examples, outputs, splits, labels — and how they feed evaluators and experiments. ---
8# Datasets
9
10A dataset is a table of **examples**. Each example (row) has an **input**, an optional **output**, and optional **metadata**. A dataset is the unit you evaluate a prompt or application against: you run something over every example and compare what comes out against what the example says.
11
12Rows in one dataset should look roughly alike — the same shape of input, the same shape of output, the same metadata keys. The dataset has no enforced schema, so this consistency is a *convention you maintain*, not something the system guarantees. When you add or edit rows, match the shape of the rows already there; a dataset where row 3 has a question field and row 4 has a prompt field is harder to evaluate and harder to reason about.
13
14## What an output actually means
15
16The most common mistake is to treat a saved output as "the correct answer." It usually is not.
17
18An output on a row is a **reference**, not a verdict. Treat it as "an answer that was recorded for this input," and ask *where it came from* before trusting it:
19
20- A dataset is **golden** only when its outputs are genuinely ideal — hand-written or hand-verified to be the answer you want. Here the output really is the target.
21- Far more often, outputs are **baselines**: captured from whatever produced them when the dataset was built (a model run, a production trace, an import). A baseline output records what the system *did*, which may be mediocre, outdated, or wrong. It is a point of comparison, not a goal.
22
23So: never assume an output is right because it is present. If the user implies the dataset is golden, you can lean on the outputs as targets; if you don't know its provenance, say so and treat outputs as references. A row with no output at all is normal and fine — it just means "we have an input to run, but no recorded answer to compare against."
24
25## How datasets feed evaluators and experiments
26
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md1,106 words
Files1
Licencenot declared
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.

≈140
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
1,485
on trigger
The instruction body, read only when the skill fires.
0.81%
of a 200k window
Ten skills this size would take about 8% of the window before you open a file.
050k100k150k200k context window

1.6k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Middling. Fine to keep on in a project where you use it weekly, worth unloading in one where you never do.

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

1 file, 6.5 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md6.5 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 1 file you can review in full before installing.

Install

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

# Datasets · 1.6k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/datasets/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/datasets" ] && { [ ! -e .claude/skills/datasets ] || { mv .claude/skills/datasets "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/datasets" .claude/skills/ && echo "Installed .claude/skills/datasets"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add karanmrn/datasets

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/datasets/ 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/datasets/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/datasets" ] && { [ ! -e ~/.claude/skills/datasets ] || { mv ~/.claude/skills/datasets "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/datasets" ~/.claude/skills/ && echo "Installed ~/.claude/skills/datasets" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/datasets/ 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
Referencekaranmrn/datasets

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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