Install Impeccable skill for Codex

.codex/skills/impeccable/scripts/context.mjs

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+/**
+ * Context loader: prints PRODUCT.md (and DESIGN.md if present) as one
+ * markdown block on stdout, or exits with empty stdout when no PRODUCT.md
+ * is found anywhere. The skill keys off "empty stdout" to branch into the
+ * init flow.
+ *
+ * Path resolution (first match wins):
+ *   1. cwd, if PRODUCT.md or DESIGN.md is there
+ *   2. .agents/context/ then docs/
+ *   3. $IMPECCABLE_CONTEXT_DIR (absolute or cwd-relative) — power-user
+ *      escape hatch, only consulted when defaults are empty
+ *   4. cwd as a "nothing found" default
+ *
+ * `resolveContextDir()` and `loadContext()` are also exported for the
+ * server-side scripts (live.mjs, live-server.mjs) that need the structured
+ * shape rather than the markdown block.
+ */
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const PRODUCT_NAMES = ['PRODUCT.md', 'Product.md', 'product.md'];
+const DESIGN_NAMES = ['DESIGN.md', 'Design.md', 'design.md'];
+const FALLBACK_DIRS = ['.agents/context', 'docs'];
+
+// ─── Update check ──────────────────────────────────────────────────────────
+// Piggyback a lightweight skill-version check on the once-per-session boot.
+// When a newer skill ships, append an UPDATE_AVAILABLE directive so the agent
+// can offer `npx impeccable skills update`. Everything here is best-effort and
+// silent on failure: a network problem, sandbox, or missing cache must never
+// block context output or print an error.
+
+const UPDATE_HOST = (process.env.IMPECCABLE_UPDATE_HOST || 'https://impeccable.style').replace(/\/$/, '');
+const UPDATE_CACHE_PATH =
+  process.env.IMPECCABLE_UPDATE_CACHE || path.join(os.homedir(), '.impeccable', 'update-check.json');
+const CHECK_INTERVAL_MS = 24 * 60 * 60 * 1000; // throttle the network poll to once a day
+const RENOTIFY_INTERVAL_MS = 7 * 24 * 60 * 60 * 1000; // don't re-surface the same version for a week
+const FETCH_TIMEOUT_MS = 1200;
+
+export function resolveContextDir(cwd = process.cwd()) {
+  if (firstExisting(cwd, [...PRODUCT_NAMES, ...DESIGN_NAMES])) {
+    return cwd;
+  }
+  for (const rel of FALLBACK_DIRS) {
+    const candidate = path.resolve(cwd, rel);
+    if (firstExisting(candidate, [...PRODUCT_NAMES, ...DESIGN_NAMES])) {
+      return candidate;
+    }
+  }
+  const envDir = process.env.IMPECCABLE_CONTEXT_DIR;
+  if (envDir && envDir.trim()) {
+    const trimmed = envDir.trim();
+    return path.isAbsolute(trimmed) ? trimmed : path.resolve(cwd, trimmed);
+  }
+  return cwd;
+}
+
+export function loadContext(cwd = process.cwd()) {
+  const contextDir = resolveContextDir(cwd);
+  const productPath = firstExisting(contextDir, PRODUCT_NAMES);
+  const designPath = firstExisting(contextDir, DESIGN_NAMES);
+  const product = productPath ? safeRead(productPath) : null;
+  const design = designPath ? safeRead(designPath) : null;
+  return {
+    hasProduct: !!product,
+    product,
+    productPath: productPath ? path.relative(cwd, productPath) : null,
+    hasDesign: !!design,
+    design,
+    designPath: designPath ? path.relative(cwd, designPath) : null,
+    contextDir,
+  };
+}
+
+function firstExisting(dir, names) {
+  for (const name of names) {
+    const abs = path.join(dir, name);
+    if (fs.existsSync(abs)) return abs;
+  }
+  return null;
+}
+
+function safeRead(p) {
+  try {
+    return fs.readFileSync(p, 'utf-8');
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Pull the register (`brand` or `product`) out of PRODUCT.md by looking
+ * for a `## Register` section and reading the first non-empty line that
+ * follows it. Returns null when the file is legacy / register-less.
+ */
+export function extractRegister(product) {
+  if (!product) return null;
+  const lines = product.split('\n');
+  for (let i = 0; i < lines.length; i++) {
+    if (/^##\s+Register\b/i.test(lines[i].trim())) {
+      for (let j = i + 1; j < lines.length; j++) {
+        const next = lines[j].trim();
+        if (!next) continue;
+        const word = next.toLowerCase();
+        if (word === 'brand' || word === 'product') return word;
+        return null;
+      }
+    }
+  }
+  return null;
+}
+
+/**
+ * Read the installed skill's own version from the sibling SKILL.md frontmatter
+ * (this file lives at `<skill>/scripts/context.mjs`). Returns null when the
+ * frontmatter is missing or unreadable.
+ */
+function readLocalSkillVersion() {
+  try {
+    const here = path.dirname(fileURLToPath(import.meta.url));
+    const skillMd = path.join(here, '..', 'SKILL.md');
+    const content = fs.readFileSync(skillMd, 'utf-8');
+    const match = content.match(/^version:\s*(.+)$/m);
+    return match ? match[1].trim().replace(/^["']|["']$/g, '') : null;
+  } catch {
+    return null;
+  }
+}
+
+function readUpdateCache() {
+  try {
+    return JSON.parse(fs.readFileSync(UPDATE_CACHE_PATH, 'utf-8'));
+  } catch {
+    return {};
+  }
+}
+
+function writeUpdateCache(cache) {
+  try {
+    fs.mkdirSync(path.dirname(UPDATE_CACHE_PATH), { recursive: true });
+    fs.writeFileSync(UPDATE_CACHE_PATH, JSON.stringify(cache));
+  } catch {
+    // Best-effort: a read-only home dir just means we re-poll next session.
+  }
+}
+
+/** Compare dotted numeric versions. Returns >0 when a is newer than b. */
+function compareSemver(a, b) {
+  const pa = String(a).split('.').map(n => parseInt(n, 10) || 0);
+  const pb = String(b).split('.').map(n => parseInt(n, 10) || 0);
+  for (let i = 0; i < Math.max(pa.length, pb.length); i++) {
+    const diff = (pa[i] || 0) - (pb[i] || 0);
+    if (diff !== 0) return diff;
+  }
+  return 0;
+}
+
+async function fetchLatestSkillVersion() {
+  try {
+    const res = await fetch(`${UPDATE_HOST}/api/version`, { signal: AbortSignal.timeout(FETCH_TIMEOUT_MS) });
+    if (!res.ok) return null;
+    const data = await res.json();
+    return typeof data?.skills === 'string' ? data.skills : null;
+  } catch {
+    return null; // offline, sandboxed, timed out, or bad JSON: all non-fatal
+  }
+}
+
+function buildUpdateDirective(localVersion, latestVersion) {
+  return (
+    `UPDATE_AVAILABLE: A newer Impeccable skill is available ` +
+    `(installed v${localVersion}, latest v${latestVersion}). ` +
+    `Before continuing, ask the user once: "A newer Impeccable (v${latestVersion}) is available. ` +
+    `Update now? It runs \`npx impeccable skills update\`." ` +
+    `If they agree, run \`npx impeccable skills update\` (the update applies to the next session, not this one). ` +
+    `Either way, continue the current task without waiting, and do not raise this again.`
+  );
+}
+
+/**
+ * Best-effort update directive for the boot output. Returns a string to append
+ * or null. Polls the version endpoint at most once per day (cached globally in
+ * the user's home dir) and re-surfaces a given version at most once per week so
+ * the agent never nags. Opt out entirely with IMPECCABLE_NO_UPDATE_CHECK=1.
+ */
+async function computeUpdateDirective(now = Date.now()) {
+  try {
+    if (process.env.IMPECCABLE_NO_UPDATE_CHECK) return null;
+    const localVersion = readLocalSkillVersion();
+    if (!localVersion) return null;
+
+    const cache = readUpdateCache();
+
+    // Poll the network only when the throttle window has elapsed. Stamp
+    // lastCheck even on failure so an offline machine doesn't poll every boot.
+    if (!cache.lastCheck || now - cache.lastCheck > CHECK_INTERVAL_MS) {
+      const latest = await fetchLatestSkillVersion();
+      cache.lastCheck = now;
+      if (latest) cache.latestVersion = latest;
+      writeUpdateCache(cache);
+    }
+
+    const latest = cache.latestVersion;
+    if (!latest || compareSemver(latest, localVersion) <= 0) return null;
+
+    // Anti-nag: surface a given version at most once per RENOTIFY window.
+    if (cache.notifiedVersion === latest && cache.notifiedAt && now - cache.notifiedAt < RENOTIFY_INTERVAL_MS) {
+      return null;
+    }
+    cache.notifiedVersion = latest;
+    cache.notifiedAt = now;
+    writeUpdateCache(cache);
+
+    return buildUpdateDirective(localVersion, latest);
+  } catch {
+    return null;
+  }
+}
+
+async function cli() {
+  const ctx = loadContext(process.cwd());
+  const updateDirective = await computeUpdateDirective();
+
+  if (!ctx.hasProduct) {
+    // Direct stdout message instead of relying on empty output as a signal
+    // — cheap models miss the empty case more often than the explicit one.
+    const parts = [
+      'NO_PRODUCT_MD: This project has no PRODUCT.md yet. ' +
+      'Stop the current task, load reference/init.md, and follow its ' +
+      'instructions to write PRODUCT.md before resuming.',
+    ];
+    if (updateDirective) parts.push(updateDirective);
+    process.stdout.write(parts.join('\n\n---\n\n') + '\n');
+    process.exit(0);
+  }
+  const parts = [`# PRODUCT.md\n\n${ctx.product.trim()}`];
+  if (ctx.hasDesign) {
+    parts.push(`# DESIGN.md\n\n${ctx.design.trim()}`);
+  }
+  const register = extractRegister(ctx.product);
+  const next = register
+    ? `NEXT STEP: This project's register is \`${register}\`. You MUST now read \`reference/${register}.md\` before producing any design output.`
+    : `NEXT STEP: You MUST now read the matching register reference (\`reference/brand.md\` or \`reference/product.md\`) before producing any design output. Pick based on PRODUCT.md above.`;
+  parts.push(next);
+  if (updateDirective) parts.push(updateDirective);
+  process.stdout.write(parts.join('\n\n---\n\n') + '\n');
+}
+
+// Run cli() only when this module is the entry point. Compare realpaths
+// rather than endsWith(): a loose suffix match also fires for unrelated
+// scripts like `load-context.mjs`, and realpath tolerates symlinked
+// invocation (the test harness symlinks the skill dir).
+function invokedAsScript() {
+  const arg = process.argv[1];
+  if (!arg) return false;
+  try {
+    return fs.realpathSync(arg) === fs.realpathSync(fileURLToPath(import.meta.url));
+  } catch {
+    return false;
+  }
+}
+
+if (invokedAsScript()) {
+  cli();
+}