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#!/usr/bin/env node

const fs = require('fs');

const path = require('path');

const root = path.join(__dirname, '..');

function read(relPath) {

return fs.readFileSync(path.join(root, relPath), 'utf8').replace(/\r\n/g, '\n').trim();

}

function stripFrontmatter(text) {

return text.replace(/^---\n[\s\S]*?\n---\n*/, '').trim();

}

const agents = read('AGENTS.md');

const canonical = agents.replace(/\n\n\(Yes, this file also applies[\s\S]*?\)$/, '').trim();

// Compact copies: same body as AGENTS.md, host-specific frontmatter stripped.

const copies = [

['.cursor/rules/ponytail.mdc', stripFrontmatter],

['.windsurf/rules/ponytail.md', text => text.trim()],

['.clinerules/ponytail.md', text => text.trim()],

['.github/copilot-instructions.md', text => text.trim()],

['.kiro/steering/ponytail.md', stripFrontmatter],

];

let failed = false;

for (const [relPath, normalize] of copies) {

const actual = normalize(read(relPath));

if (actual !== canonical) {

console.error(`${relPath} drifted from AGENTS.md`);

failed = true;

}

}

// SKILL.md is the runtime source of truth and is longer than the compact body,

// so it cannot be byte-compared. ponytail: canary, not full equality. Assert the

// load-bearing rules survive verbatim in both the source and AGENTS.md. Changing

// a rule's wording trips this, which is the reminder to propagate it everywhere.

// Upgrade path: generate the copies from SKILL.md if this ever misses a real drift.

const INVARIANTS = [

'naive heuristic', // ceiling-comment rule

'ONE runnable check', // test reflex

'flimsier algorithm', // robust-variant rule

'input validation at trust boundaries', // the "not lazy about" clause

'Lazy code without its check is unfinished', // one-check promoted to headline

];

const skill = read('skills/ponytail/SKILL.md');

const sources = [['skills/ponytail/SKILL.md', skill], ['AGENTS.md', agents]];

for (const phrase of INVARIANTS) {

for (const [label, text] of sources) {

if (!text.includes(phrase)) {

console.error(`${label} is missing rule invariant: "${phrase}"`);

failed = true;

}

}

}

if (failed) {

console.error('Update the copied rule text, AGENTS.md, or SKILL.md so the shared rules match.');

process.exit(1);

}

console.log(`Rule copies match AGENTS.md; ${INVARIANTS.length} rule invariants present in SKILL.md and AGENTS.md.`);