TomeScout

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KDP keyword boxes, listing checks, royalties and sales-from-rank for self-published authors

Marketing & SEO Commerce

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bsr_to_sales Read-only

Turns an Amazon Best Sellers Rank (the 'Best Sellers Rank' line on a book's Amazon page, overall store rank) into an estimated range of units per day and per month, using two independent public models. Amazon.com (Kindle Store or print); UK/DE are rough scalings. Optionally multiplies by royalty per sale.

bsrinteger, required

formatstring

marketplacestring

royaltyPerSalenumber

Tools (4)

bsr_to_sales

read-only

Argument	Type	Description
bsr*	integer
format	string
marketplace	string
royaltyPerSale	number

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "bsr"
  ],
  "properties": {
    "bsr": {
      "type": "integer",
      "maximum": 20000000,
      "minimum": 1
    },
    "format": {
      "enum": [
        "kindle",
        "print"
      ],
      "type": "string",
      "default": "kindle"
    },
    "marketplace": {
      "enum": [
        "US",
        "UK",
        "DE"
      ],
      "type": "string",
      "default": "US"
    },
    "royaltyPerSale": {
      "type": "number",
      "maximum": 1000,
      "exclusiveMinimum": 0
    }
  }
}

check_listing

Checks a book's title, subtitle, description, keyword boxes and categories against Amazon KDP's published metadata guidelines (length limits, allowed HTML, prohibited claims, other authors/titles/trademarks, programme names, contact details, review requests, emojis) and gives optimisation tips. Each issue links to the KDP help page it comes from.

read-only

Argument	Type	Description
title*	string
keywords	array
subtitle	string
categories	array
description	string

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "title"
  ],
  "properties": {
    "title": {
      "type": "string",
      "maxLength": 500,
      "minLength": 1
    },
    "keywords": {
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 200
      },
      "maxItems": 20
    },
    "subtitle": {
      "type": "string",
      "maxLength": 500
    },
    "categories": {
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 200
      },
      "maxItems": 10
    },
    "description": {
      "type": "string",
      "maxLength": 10000
    }
  }
}

keyword_boxes

Packs keyword phrases (most important first) into KDP's 7 keyword boxes of 50 characters each. Removes words already in the title/subtitle, drops prohibited, trademarked and likely author/title phrases, and reports what did not fit.

read-only

Argument	Type	Description
title	string
phrases*	array
subtitle	string
skipTitleWords	boolean

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "phrases"
  ],
  "properties": {
    "title": {
      "type": "string",
      "maxLength": 300
    },
    "phrases": {
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 120,
        "minLength": 1
      },
      "maxItems": 80,
      "minItems": 1
    },
    "subtitle": {
      "type": "string",
      "maxLength": 300
    },
    "skipTitleWords": {
      "type": "boolean",
      "default": true
    }
  }
}

royalty_calculator

Calculates KDP royalties per sale. eBook: 70% vs 35% option for any of 13 Amazon stores (current 2026 price bands, delivery cost per MB, VAT/GST handling, KDP Select rules). Paperback: printing cost and royalty on Amazon.com/.co.uk/EU stores (60% or 50% tier). Optional Kindle Unlimited earnings from pages read.

read-only

Argument	Type	Description
ink	string
trim	string	"large" = wider than 6.12" or taller than 9".
pages	integer	Paperback page count.
format*	string
kdpSelect	boolean
listPrice*	number
fileSizeMb	number	eBook file size after conversion (MB).
marketplace	string	eBook: US, UK, DE, FR, ES, IT, NL, JP, CA, AU, BR, MX, IN. Paperback: US, UK or EU.
monthlySales	integer