Method indirectTestNote

src/mcp/tools.ts:2499–2535

* Test-coverage note for a blast-radius entry whose DIRECT callers include no * test file. A helper called only by production code can still be exercised * by tests further up the caller chain (#1475: 40% of directly-unflagged * symbols had a test within 2-3 hops), so walk up to 2 more hops

(cg: CodeGraph, directCallers: Node[], rel: (p: string) => string)

   * claiming anything — and even then claim only what was measured.
   */
  private indirectTestNote(cg: CodeGraph, directCallers: Node[], rel: (p: string) => string): string {
    const MAX_HOPS = 3; // direct callers are hop 1
    const BUDGET = 64;  // getCallers lookups per entry — bounds god-fan-in symbols
    const FILE_CAP = 2;
    let budget = BUDGET;
    const visited = new Set(directCallers.map((n) => n.id));
    let frontier = directCallers;
    for (let hop = 2; hop <= MAX_HOPS && frontier.length > 0 && budget > 0; hop++) {
      const next: Node[] = [];
      const found = new Set<string>();
      for (const node of frontier) {
        if (budget-- <= 0) break;
        let callers: Array<{ node: Node }> = [];
        try { callers = cg.getCallers(node.id) as Array<{ node: Node }>; } catch { continue; }
        for (const c of callers) {
          const n = c?.node;
          if (!n || visited.has(n.id)) continue;
          visited.add(n.id);
          const f = rel(n.filePath);
          if (isTestFile(f)) found.add(f);
          else next.push(n);
        }
      }
      if (found.size > 0) {
        const files = [...found];
        const shown = files.slice(0, FILE_CAP).map((f) => `\`${f}\``).join(', ');
        const more = files.length > FILE_CAP ? ` +${files.length - FILE_CAP}` : '';
        return `; tested via callers: ${shown}${more}`;
      }
      frontier = next;
    }
    // Budget exhaustion means hops 2-3 weren't fully searched — fall back to
    // the weaker claim that IS established by the direct-caller check.
    return budget > 0
      ? `; no tests found within ${MAX_HOPS} caller hops`
      : '; no test calls this directly';
  }

  /**
   * Graph-connectivity relevance via Random-Walk-with-Restart (personalized