Function planFrontload

src/directory.ts:602–642

(cwd: string, prompt: string)

 *   3. **nothing indexed reachable** → do nothing (the agent's own tools apply).
 */
export function planFrontload(cwd: string, prompt: string): FrontloadPlan {
  const none: FrontloadPlan = { exploreRoot: null, nudgeProjects: [], viaSubScan: false };

  // 1. up-walk — nearest indexed ancestor (incl. cwd). Cheap; covers the common
  //    single-project case without a down-scan.
  let dir = path.resolve(cwd);
  for (let i = 0; i < 6; i++) {
    if (isInitialized(dir)) return { exploreRoot: dir, nudgeProjects: [], viaSubScan: false };
    const parent = path.dirname(dir);
    if (parent === dir) break;
    dir = parent;
  }

  // 2. down-scan — only from something that looks like a workspace root, so a
  //    non-project cwd (e.g. $HOME) is a cheap no-op, not a deep crawl.
  const base = path.resolve(cwd);
  if (!looksLikeProjectRoot(base)) return none;
  const subs = findIndexedSubprojectRoots(base);
  if (subs.length === 0) return none;
  if (subs.length === 1) return { exploreRoot: subs[0]!, nudgeProjects: [], viaSubScan: true };

  // Several indexed sub-projects — pick the one the prompt points at, if any.
  const p = prompt.toLowerCase();
  let best: { root: string; score: number; relLen: number } | null = null;
  for (const s of subs) {
    const rel = path.relative(base, s);
    const relLc = rel.split(path.sep).join('/').toLowerCase();
    const name = path.basename(s).toLowerCase();
    let score = 0;
    if (relLc && p.includes(relLc)) score = 10;                         // "packages/api"
    else if (name.length >= 3 && new RegExp(`\\b${escapeRegExp(name)}\\b`).test(p)) score = 5; // "api"
    if (score > 0 && (!best || score > best.score || (score === best.score && rel.length < best.relLen))) {
      best = { root: s, score, relLen: rel.length };
    }
  }
  if (best) {
    return { exploreRoot: best.root, nudgeProjects: subs.filter((s) => s !== best!.root), viaSubScan: true };
  }
  // No clear match — nudge the full list rather than front-load a guess.
  return { exploreRoot: null, nudgeProjects: subs, viaSubScan: true };
}

/**
 * Contents of `.codegraph/.gitignore`. A single wildcard ignore keeps every