Kc Review Agent Skill

Use ONLY for code review and test write/review guidance in `packages/agent-core-v2` (the DI × Scope agent engine).

Context cost
5.9k tokensestimated from the bundle, loaded when it triggers
Bundle
3 files · 23.5 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

Use ONLY for code review and test write/review guidance in `packages/agent-core-v2` (the DI × Scope agent engine). Does NOT apply to the legacy `packages/agent-core` or to any other package — for those, do not load this skill. Groups the review and testing lenses used for agent-core-v2 — `slop` (single-level-of-abstraction / layered error-handling review, invoked only on explicit request) and `test` (contract-driven per-test rules for both authoring and reviewing tests). Apply the sub-skill that matches the task; do not apply `slop` unprompted.

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.

agentcode reviewsecuritytesting

The skill itself

A skill is instructions the model reads, and here they are in full: the front matter loads with every session, and the body below it loads when the skill triggers. The other files in the bundle are listed further down.

SKILL.md2.2 kB
--- name: agent-core-review has-sub-skill: true ---
7# kc-review
8
9> **Scope: packages/agent-core-v2 only.** These lenses are calibrated for the v2 engine (DI × Scope). Do not apply them to the legacy packages/agent-core or to other packages.
10
11A bundle of the lenses used when reviewing or testing packages/agent-core-v2. Each sub-skill is self-contained; invoke the one that matches the task.
12
13## Sub-skills
14
15- **slop/** — Single Level of Abstraction & layered error handling. A *review dimension*: a function should read as a straight-line description of its own layer, with errors handled above or below. The agent reports detections and measurements, not severity grades. **Invoke only when the user explicitly asks for this lens** — do not apply it unprompted to general reviews or refactors.
16- **test/** — Per-test rules behind "test the contract / responsibility, not the implementation," serving two modes. **Write mode:** author a test — one behavior per it, drive through the public surface, stub only the true external boundary, control time/config via documented knobs, keep tests clear, isolated, and refactor-resilient (CCCR). **Review mode:** audit existing tests against the same rules and report findings with file:line. Use when writing, modifying, or reviewing tests, or when asked how to write a good single test.
17
18## Routing
19
20- Reviewing code structure / abstraction layers / where error handling belongs → slop (only on explicit request).
21- Writing or modifying tests, reviewing test quality, or advising on a single test → test.
22
This is the whole of SKILL.md. Install the skill to get it and everything beside it.
In the file
SKILL.md320 words
Files3
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.

≈150
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
5,725
on trigger
The instruction body and 2 supporting files, read only when the skill fires.
2.9%
of a 200k window
Ten skills this size would take about 29% of the window before you open a file.
050k100k150k200k context window

5.9k 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, shown in full above.

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

  • SKILL.md2.2 kB
  • slop/SKILL.md13.8 kB
  • test/SKILL.md7.5 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.

Install

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

# Kc Review · 5.9k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/kc-review/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/kc-review" ] && { [ ! -e .claude/skills/kc-review ] || { mv .claude/skills/kc-review "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/kc-review" .claude/skills/ && echo "Installed .claude/skills/kc-review"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add karanmrn/kc-review

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

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/kc-review

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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