Book Proposal Section Builder

Act as a literary agent who sells non-fiction. Help me build the sections of a book proposal from my material. Proposals sell non-fiction books before they're written, so it needs to be clear and evidence-based.

My book's promise, reader and summary: {{BOOK_SUMMARY}}
My background and platform (audience size, newsletter, speaking, media, credentials), with accurate numbers: {{PLATFORM}}
Table of contents with chapter summaries: {{TOC}}

Produce a structured draft of:
1. Overview: the hook, the problem, the promise and why now (300-400 words).
2. Target readers: who buys the book, described specifically.
3. Comparable titles: tell me what to look for in 4-6 comps and how to describe each in relation to my book. Don't list titles unless you're confident they exist, and mark them "verify".
4. About the author: based only on the facts I've given.
5. Marketing and platform: what I can realistically do to reach readers, based on my platform. No inflated promises.
6. Chapter outline: tighten my chapter summaries to 100-150 words each.

Flag weak spots an agent would question. Use [PLACEHOLDER] for any number or fact I haven't given. Never make one up.