build-cli-plugin
About
This skill guides developers in building CLI plugins or adapters using an abstract base class pattern. It covers defining the plugin contract, implementing idempotent install/uninstall methods, and choosing installation strategies like symlink or copy. Use it when adding support for a new framework to a CLI tool or extending an existing plugin architecture.
Quick Install
Claude Code
Recommendednpx skills add pjt222/agent-almanac -a claude-code/plugin add https://github.com/pjt222/agent-almanacgit clone https://github.com/pjt222/agent-almanac.git ~/.claude/skills/build-cli-pluginCopy and paste this command in Claude Code to install this skill
Documentation
Build a CLI Plugin
以抽象基類模式為 CLI 工具之可插架構加新插件或適配器。
適用時機
- 為 CLI 安裝器加新目標框架之支援
- 為多目標命令列工具建插件系統
- 以新策略變體擴既有適配器架構
- 將內容交付移植至用異文件佈局之框架
輸入
- 必要:插件所支之框架或目標(名、配置路徑、約定)
- 必要:基類或插件合同之路徑
- 必要:安裝策略:
symlink、copy、file-per-item或append-to-file - 選擇性:插件處之內容類型(如僅 skills、skills + agents、全支援)
- 選擇性:範圍支援(項目級、全域、二者)
步驟
步驟一:定合同
基類立諸插件須實作之介面:
export class FrameworkAdapter {
static id = 'base'; // Unique identifier
static displayName = 'Base'; // Human-readable name
static strategy = 'symlink'; // Installation strategy
static contentTypes = ['skill']; // What this adapter handles
async detect(projectDir) { return false; }
getTargetPath(projectDir, scope) { throw new Error('Not implemented'); }
async install(item, projectDir, scope, options) { throw new Error('Not implemented'); }
async uninstall(item, projectDir, scope, options) { throw new Error('Not implemented'); }
async listInstalled(projectDir, scope) { return []; }
async audit(projectDir, scope) { return { framework: this.constructor.displayName, ok: [], warnings: [], errors: [] }; }
supports(contentType) { return this.constructor.contentTypes.includes(contentType); }
}
靜態欄位定插件之身與能:
id:用於--framework <id>選項與結果報告displayName:於人可讀輸出所示strategy:定內容如何至目標contentTypes:濾此適配器所接之項
若基類尚不存,先創之。此模式可伸至任多插件。
預期: 含靜身欄位與抽象方法之基類。
失敗時: 若基類有方法不適於諸插件(如非諸框架皆支 audit),提預設實作返合理無操作。
步驟二:擇安裝策略
| Strategy | When to use | Example |
|---|---|---|
| symlink | 目標直讀源文件。最廉、恆同步。 | Claude Code 讀 .claude/skills/<name>/ 之 symlinks |
| copy | 目標需文件於其自目錄。改不傳。 | 某些 IDE 只索其自目錄 |
| file-per-item | 目標期每項一文件,具特定格式。 | Cursor .mdc 規則文件 |
| append-to-file | 目標讀單指令文件。 | Aider CONVENTIONS.md、Codex AGENTS.md |
策略定實作之形:
- Symlink:
symlinkSync(source, target)——處相對對絕對路徑 - Copy:
cpSync(source, target, { recursive: true })——處覆寫 - File-per-item:
writeFileSync(target, transform(content))——或需格式轉 - Append-to-file:包內容於標記以冪等插/改/刪
預期: 擇策略附明理,基於目標框架如何發現內容。
失敗時: 若不確,查框架之文檔察其如何發現配置或指令文件。若框架讀任意目錄,預設用 symlink。
步驟三:實作偵測
偵測告 CLI 項目中有何框架:
// In detector.js — each rule checks for a filesystem marker
const RULES = [
{
id: 'my-framework',
displayName: 'My Framework',
check: (dir) => existsSync(resolve(dir, '.myframework/')),
marker: '.myframework/',
scope: 'project',
},
];
偵測策略:
- 目錄存:
.claude/、.cursor/、.gemini/ - 配置文件:
opencode.json、.aider.conf.yml - 指令文件:
AGENTS.md、CONVENTIONS.md - 全域標記:
~/.openclaw/、~/.hermes/
恆於偵測果返標記,以使用戶可解框架何以被偵測。
預期: 偵測規則可靠辨框架而無偽陽。
失敗時: 若框架無唯一標記(泛目錄名),用標記之合或求明之 --framework 指定。
步驟四:實作冪等之安裝
async install(item, projectDir, scope, options) {
const targetDir = this.getTargetPath(projectDir, scope);
const targetPath = resolve(targetDir, item.id);
// Idempotency: skip if already installed (unless force)
if (existsSync(targetPath) && !options.force) {
return { action: 'skipped', path: targetPath };
}
if (options.dryRun) {
return { action: 'created', path: targetPath, details: 'dry-run' };
}
// Ensure parent directory exists
mkdirSync(targetDir, { recursive: true });
// Strategy-specific installation
if (this.constructor.strategy === 'symlink') {
const relPath = relative(targetDir, item.sourceDir);
symlinkSync(relPath, targetPath);
} else if (this.constructor.strategy === 'copy') {
cpSync(item.sourceDir, targetPath, { recursive: true });
}
return { action: 'created', path: targetPath };
}
冪等之則:
- 略若目標存且
--force未設 - 覆若
--force已設(先刪再裝) - 乾跑恆以
action: 'created'成 - 返值恆須為
{ action, path, details? }
預期: 安裝於目標路徑建內容,既存則略,重 --force 與 --dry-run。
失敗時: 若 Windows/NTFS 上 symlink 建失,退為目錄 junction 或 copy。記此退。
步驟五:實作清理之卸載
async uninstall(item, projectDir, scope, options) {
const targetDir = this.getTargetPath(projectDir, scope);
const targetPath = resolve(targetDir, item.id);
if (!existsSync(targetPath)) {
return { action: 'skipped', path: targetPath };
}
if (options.dryRun) {
return { action: 'removed', path: targetPath };
}
// Remove the installed content
rmSync(targetPath, { recursive: true });
return { action: 'removed', path: targetPath };
}
清理之慮:
- 只刪插件所裝——永勿刪用戶所創之文件
- 對 append-to-file:刪所標之段,非全文件
- 留父目錄完整(他插件或用之)
預期: 卸載只刪插件之內容而無他。
失敗時: 若刪失(權限、鎖文件),返錯結果而非拋。
步驟六:實作列舉與審
async listInstalled(projectDir, scope) {
const targetDir = this.getTargetPath(projectDir, scope);
if (!existsSync(targetDir)) return [];
const entries = readdirSync(targetDir);
return entries.map(name => {
const fullPath = resolve(targetDir, name);
const broken = lstatSync(fullPath).isSymbolicLink()
&& !existsSync(fullPath);
return { id: name, type: 'skill', broken };
});
}
async audit(projectDir, scope) {
const items = await this.listInstalled(projectDir, scope);
const ok = items.filter(i => !i.broken);
const broken = items.filter(i => i.broken);
return {
framework: this.constructor.displayName,
ok: [`${ok.length} skills installed`],
warnings: [],
errors: broken.map(i => `Broken: ${i.id}`),
};
}
預期: 列舉返諸裝項,附破鏈偵測。審總健康。
失敗時: 若目標目錄不存,返空(非錯——框架只是無裝)。
步驟七:註冊插件
// In adapters/index.js
import { MyFrameworkAdapter } from './my-framework.js';
register(MyFrameworkAdapter);
註冊令適配器可用於:
- 自動偵測(
detectFrameworks()→getAdaptersForDetections()) - 明擇(
--framework my-framework) - 列舉(
listAdapters())
預期: 適配器於 tool detect 輸出顯,可以 --framework 為標。
失敗時: 若適配器不顯,驗 static id 合偵測規則之 id 且 register() 已呼。
步驟八:書測試
describe('adapter: my-framework (dry-run)', () => {
it('targets the correct path', () => {
const out = run('install create-skill --framework my-framework --dry-run');
assert.match(out, /\.myframework/i);
});
});
至少測:乾跑路徑、偵測存、內容類型支援。
預期: 適配器專之測確安裝路徑與行為。
失敗時: 若框架於 CI 中未偵(無標記目錄),測中明用 --framework。
驗證
- 插件正擴基類
- 靜態欄位(
id、displayName、strategy、contentTypes)已設 - 偵測規則辨框架而無偽陽
-
install()冪等(存則略、重--force) -
uninstall()只刪插件所創內容 -
listInstalled()偵破 symlinks -
audit()準報健康 - 插件已註,於
tool detect顯 - 乾跑測過
常見陷阱
- 忽相對對絕對 symlinks:項目範圍之 symlinks 當為相對(可移)。全域範圍之 symlinks 當為絕對(不依 cwd)。
- 未處父目錄之缺:恆
mkdirSync(dir, { recursive: true })後創內容。 - 無標記之 append-to-file:無冪等之標記(
<!-- start:id -->/<!-- end:id -->),重裝複內容。恆包附加之內容。 - 偵測之偽陽:泛目錄名(如
.config/)或配諸框架。用目錄中之專文件標記。 - 忽
supports()之查:安裝器呼supports(item.type)後派。若contentTypes誤,適配器默略項。
相關技能
scaffold-cli-command— 建用此插件之 CLI 命令test-cli-application— CLI 工具之測模式,含適配器測design-cli-output— 安/卸載結果之終端輸出
GitHub Repository
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