CakePHP Migration Assistant Agent Skill

Resolves CakePHP 5.x upgrade breaking changes and deprecations with targeted fixes for ORM, events, plugins, and baserCMS ecosystems.

Context cost
6.2k tokensestimated from the bundle, loaded when it triggers
Bundle
1 file · 24.6 kBtext throughout, nothing executable
Licence
MITthe author’s own terms
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

baserCMS の CakePHP バージョンアップ(5.0 → 5.1 → 5.2 ~)対応の非推奨・破壊的変更パターン集と修正レシピ。「Association alias already set」「A validation rule with the name already exists」「_Token not found」「headers already sent」「Plugin named X is already loaded」「ResultSet/PaginatedResultSet のエラー」「order()/group() 非推奨」「イベントリスナーの戻り値非推奨」「find('all', $options) 非推奨」「Table::get の配列 options 非推奨/名前付き引数」「配列条件の null 値で例外」「_cake_core_ キャッシュ設定」「pluginBootstrap で後続プラグインの setting.php が読まれず Configure が null(live イテレーション)」「_checkFilePath で ..

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.md24.6 kB · preview
--- name: cakephp-migration license: MIT ---
7# CakePHP バージョン移行ガイド(baserCMS)
8
9CakePHP のアップグレードで遭遇した破壊的変更・非推奨と修正レシピ集。**バージョン別**に整理して育てる。PHP 本体起因(暗黙nullable・動的プロパティ等)は別スキル php-migration を参照。
10
11> 収録: 5.0 → 5.1、5.1 → 5.2。バージョンの帰属は移行作業時の実観測ベース(厳密な導入版と差異がありうる)。新バージョン対応時は新しい「## X.Y → X.Z の変更」節を追記する。
12
13---
14
15## 大原則(全バージョン共通)
16
17- **アップグレードは composer require を使う。composer update は使わない**(依存全体が動くのを避ける)。
18 例: composer require cakephp/cakephp:"5.2.*" --update-with-dependencies
19- **「致命的エラー」と「非推奨警告」を区別する**。デバッグモードでは非推奨警告が画面下部に表示され「エラー」に見えるが、logs/debug.log の debug: は警告(動作継続)。logs/error.log や Fatal/Exception が本当のエラー。
20- **テスト大量失敗時は根本原因単位で分類する**。数百件の失敗でも原因は十数種。フルログから例外を集計して systemic な原因を先に潰す(集計コマンド・切り分け手順は basercms-unittest スキル参照)。
21- **regression と既存/環境failを切り分ける**。git diff HEAD -- <file> で自分の変更対象か確認。未変更ファイルかつ fixture/プラグインロード依存(Plugin::isLoaded('X') が false/DIコンテナ未登録/英語↔日本語メッセージ不一致)なら移行起因ではなく環境要因。**vendor が既に新版に入れ替わっているため単純な git stash ではクリーンな baseline は作れない**。
22
23> ユニットテストの実行方法・失敗の集計と切り分け手順は basercms-unittest スキルを参照。
24
25---
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md1,359 words
Files1
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.

≈240
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
5,910
on trigger
The instruction body, read only when the skill fires.
3.1%
of a 200k window
Ten skills this size would take about 31% of the window before you open a file.
050k100k150k200k context window

6.2k 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

1 file, 24.6 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md24.6 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. 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.

# CakePHP Migration Assistant · 6.2k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/cakephp-migration-assistant/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/cakephp-migration-assistant" ] && { [ ! -e .claude/skills/cakephp-migration-assistant ] || { mv .claude/skills/cakephp-migration-assistant "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/cakephp-migration-assistant" .claude/skills/ && echo "Installed .claude/skills/cakephp-migration-assistant"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add baserproject/cakephp-migration-assistant

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

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
Referencebaserproject/cakephp-migration-assistant

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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