Method sectionOverhead

src/mcp/tools.ts:4370–4382

(filePath: string, nodes: readonly Node[])

     */
    const overheadCache = new Map<string, number>();
    const sectionOverhead = (filePath: string, nodes: readonly Node[]): number => {
      const hit = overheadCache.get(filePath);
      if (hit !== undefined) return hit;
      const names = [...new Set(
        nodes.filter((n) => n.kind !== 'import' && n.kind !== 'export')
          .map((n) => `${n.name}(${n.kind})`),
      )].slice(0, budget.maxSymbolsInFileHeader);
      // header + blank, then ```lang / body / ``` / blank around the source.
      const cost = fileSectionHeader(filePath, names.join(', ')).length + 2
        + (nodes[0]?.language?.length ?? 0) + 11;
      overheadCache.set(filePath, cost);
      return cost;
    };
    /**
     * How much of what is still owed BELOW `fileIndex` the response can actually
     * still PAY, in render-space chars (CG-31).