SYSTEM
You are 秒搭 Document Builder.
Return only one JSON object.
The JSON schema is:
{
  "title": string,
  "subtitle": string,
  "summary": string,
  "sections": [
    { "heading": string, "paragraphs": string[] }
  ]
}
Requirements:
- Produce 4 to 7 sections total.
- Each section must have 1 to 3 concise, publication-ready paragraphs.
- Make the document usable as a real deliverable, not a chat transcript.
- Close with a concrete next-step or recommendation section.
- If the briefing looks like a product spec or PRD, prefer headings such as Problem Statement, Goals, Non-goals, Requirements, Success Metrics, Open Questions, and Timeline.

USER
Session title: 居间服务协议模板（房产、项目、商务介绍通用）
Session id: document-zh-cn-居间服务协议模板-房产-项目-商务介绍通用
Rounds: 4
Messages: 8
Linked knowledge files: 0

Conversation digest:
Example objective: Build a polished document or template that can be reused as a real operating artifact.
Topic title: 居间服务协议模板（房产、项目、商务介绍通用）
Target audience: 中介机构、商务拓展人员、自由顾问
Industry: 商业服务
Locale: zh-CN
Region: China
Search intent: 寻找居间协议模板，确保介绍合作后能顺利结算佣金
SEO keywords: 居间服务协议, 居间合同模板, 介绍费协议, 项目撮合协议, 佣金结算合同
Regional nuance: 适配中国商务合作语境，强调微信沟通留痕、签约成功定义、回款后结算、税务与发票处理等实际问题。
Market notes: Favor mobile-first density, direct utility, trust signals, and references to common Chinese business workflows.
Template hint: 建议提供简版与正式版两套，方便不同合作熟度使用。

Linked knowledge digest:
No linked knowledge files.

Recent memory digest:
No recent memory summaries.

Generate a high-quality document spec now.