Function transformFrontmatter

scripts/gen-skill-docs.ts:510–602

* Transform frontmatter for external hosts. * Claude: strips `sensitive:` field (only Factory uses it). * Codex: keeps name + description only, enforces 1024-char limit. * Factory: keeps name + description + user-invocable, conditionally adds disable-model-invocation.

(content: string, host: Host)

 * Factory: keeps name + description + user-invocable, conditionally adds disable-model-invocation.
 */
function transformFrontmatter(content: string, host: Host): string {
  const hostConfig = getHostConfig(host);
  const fm = hostConfig.frontmatter;

  if (fm.mode === 'denylist') {
    // Denylist mode: strip listed fields, keep everything else
    for (const field of fm.stripFields || []) {
      if (field === 'voice-triggers') {
        content = content.replace(/^voice-triggers:\n(?:\s+-\s+"[^"]*"\n?)*/m, '');
      } else {
        content = content.replace(new RegExp(`^${field}:\\s*.*\\n`, 'm'), '');
      }
    }
    return content;
  }

  // Allowlist mode: reconstruct frontmatter with only allowed fields
  const fmStart = content.indexOf('---\n');
  if (fmStart !== 0) return content;
  const fmEnd = content.indexOf('\n---', fmStart + 4);
  if (fmEnd === -1) return content;
  const frontmatter = content.slice(fmStart + 4, fmEnd);
  const body = content.slice(fmEnd + 4);
  const { name, description } = extractNameAndDescription(content);

  // Description limit enforcement
  if (fm.descriptionLimit) {
    const behavior = fm.descriptionLimitBehavior || 'error';
    if (description.length > fm.descriptionLimit) {
      if (behavior === 'error') {
        throw new Error(
          `${hostConfig.displayName} description for "${name}" is ${description.length} chars (max ${fm.descriptionLimit}). ` +
          `Compress the description in the .tmpl file.`
        );
      } else if (behavior === 'warn') {
        console.warn(`WARNING: ${hostConfig.displayName} description for "${name}" exceeds ${fm.descriptionLimit} chars`);
      }
      // 'truncate' — silently proceed
    }
  }

  // Build frontmatter with allowed fields
  const indentedDesc = description.split('\n').map(l => `  ${l}`).join('\n');
  let newFm = `---\nname: ${name}\ndescription: |\n${indentedDesc}\n`;

  // Add extra fields (host-wide)
  if (fm.extraFields) {
    for (const [key, value] of Object.entries(fm.extraFields)) {
      if (key !== 'name' && key !== 'description') {
        newFm += `${key}: ${value}\n`;
      }
    }
  }

  // Add conditional fields
  if (fm.conditionalFields) {
    for (const rule of fm.conditionalFields) {
      const match = Object.entries(rule.if).every(([k, v]) =>