App Market Intelligence MCP

app-store-list

Retrieve curated App Store app listings from iTunes collections to analyze market trends, research competitors, and discover applications across categories and regions.

Instructions

Get apps from iTunes collections. Returns a list of apps with:

id: App Store ID number
appId: Bundle ID (e.g. 'com.company.app')
title: App name
icon: Icon image URL
url: App Store URL
price: Price in USD
currency: Price currency code
free: Boolean indicating if app is free
description: App description
developer: Developer name
developerUrl: Developer's App Store URL
developerId: Developer's ID
genre: App category name
genreId: Category ID
released: Release date (ISO string)

Input Schema

TableJSON Schema

Name	Required	Description	Default
`collection`	Yes	Collection to fetch from. Available collections: - newapplications: New iOS applications - newfreeapplications: New free iOS applications - newpaidapplications: New paid iOS applications - topfreeapplications: Top free iOS applications - topfreeipadapplications: Top free iPad applications - topgrossingapplications: Top grossing iOS applications - topgrossingipadapplications: Top grossing iPad applications - toppaidapplications: Top paid iOS applications - toppaidipadapplications: Top paid iPad applications
`category`	No	Category ID to filter by. Available categories: Main Categories: - 6000: BUSINESS - 6001: WEATHER - 6002: UTILITIES - 6003: TRAVEL - 6004: SPORTS - 6005: SOCIAL_NETWORKING - 6006: REFERENCE - 6007: PRODUCTIVITY - 6008: PHOTO_AND_VIDEO - 6009: NEWS - 6010: NAVIGATION - 6011: MUSIC - 6012: LIFESTYLE - 6013: HEALTH_AND_FITNESS - 6014: GAMES - 6015: FINANCE - 6016: ENTERTAINMENT - 6017: EDUCATION - 6018: BOOKS - 6020: MEDICAL - 6021: MAGAZINES_AND_NEWSPAPERS - 6022: CATALOGS - 6023: FOOD_AND_DRINK - 6024: SHOPPING Games Subcategories: - 7001: ACTION - 7002: ADVENTURE - 7003: ARCADE - 7004: BOARD - 7005: CARD - 7006: CASINO - 7007: DICE - 7008: EDUCATIONAL - 7009: FAMILY - 7011: MUSIC - 7012: PUZZLE - 7013: RACING - 7014: ROLE_PLAYING - 7015: SIMULATION - 7016: SPORTS - 7017: STRATEGY - 7018: TRIVIA - 7019: WORD Magazine Subcategories: - 13001: POLITICS - 13002: FASHION - 13003: HOME - 13004: OUTDOORS - 13005: SPORTS - 13006: AUTOMOTIVE - 13007: ARTS - 13008: WEDDINGS - 13009: BUSINESS - 13010: CHILDREN - 13011: COMPUTER - 13012: FOOD - 13013: CRAFTS - 13014: ELECTRONICS - 13015: ENTERTAINMENT - 13017: HEALTH - 13018: HISTORY - 13019: LITERARY - 13020: MEN - 13021: MOVIES_AND_MUSIC - 13023: FAMILY - 13024: PETS - 13025: PROFESSIONAL - 13026: REGIONAL - 13027: SCIENCE - 13028: TEENS - 13029: TRAVEL - 13030: WOMEN
`lang`	No	Language code for result text. If not provided, uses country-specific language.
`fullDetail`	No	Get full app details including ratings, reviews etc (default: false)
`country`	No	Country code (default: us)	us
`num`	No	Number of results (default: 50, max: 200)

Implementation Reference

src/server.js:392-395 (handler)

Handler function that invokes store.list from the external '@jeromyfu/app-store-scraper' library with provided parameters and returns the results as JSON in a content block.

async ({ collection, category, country, num, lang, fullDetail }) => {
  const results = await store.list({ collection, category, country, num, lang, fullDetail });
  return { content: [{ type: "text", text: JSON.stringify(results) }] };
}

src/server.js:288-391 (schema)

Zod input schema defining parameters for the tool: collection (enum of App Store lists), optional category ID, lang, fullDetail, country (default 'us'), num (default 50, max 200).

{
  collection: z.enum([
    'newapplications',
    'newfreeapplications',
    'newpaidapplications',
    'topfreeapplications',
    'topfreeipadapplications',
    'topgrossingapplications',
    'topgrossingipadapplications',
    'toppaidapplications',
    'toppaidipadapplications'
  ]).describe(
    "Collection to fetch from. Available collections:\n" +
    "- newapplications: New iOS applications\n" +
    "- newfreeapplications: New free iOS applications\n" +
    "- newpaidapplications: New paid iOS applications\n" +
    "- topfreeapplications: Top free iOS applications\n" +
    "- topfreeipadapplications: Top free iPad applications\n" +
    "- topgrossingapplications: Top grossing iOS applications\n" +
    "- topgrossingipadapplications: Top grossing iPad applications\n" +
    "- toppaidapplications: Top paid iOS applications\n" +
    "- toppaidipadapplications: Top paid iPad applications"
  ),
  category: z.number().optional().describe(
    "Category ID to filter by. Available categories:\n" +
    "Main Categories:\n" +
    "- 6000: BUSINESS\n" +
    "- 6001: WEATHER\n" +
    "- 6002: UTILITIES\n" +
    "- 6003: TRAVEL\n" +
    "- 6004: SPORTS\n" +
    "- 6005: SOCIAL_NETWORKING\n" +
    "- 6006: REFERENCE\n" +
    "- 6007: PRODUCTIVITY\n" +
    "- 6008: PHOTO_AND_VIDEO\n" +
    "- 6009: NEWS\n" +
    "- 6010: NAVIGATION\n" +
    "- 6011: MUSIC\n" +
    "- 6012: LIFESTYLE\n" +
    "- 6013: HEALTH_AND_FITNESS\n" +
    "- 6014: GAMES\n" +
    "- 6015: FINANCE\n" +
    "- 6016: ENTERTAINMENT\n" +
    "- 6017: EDUCATION\n" +
    "- 6018: BOOKS\n" +
    "- 6020: MEDICAL\n" +
    "- 6021: MAGAZINES_AND_NEWSPAPERS\n" +
    "- 6022: CATALOGS\n" +
    "- 6023: FOOD_AND_DRINK\n" +
    "- 6024: SHOPPING\n\n" +
    "Games Subcategories:\n" +
    "- 7001: ACTION\n" +
    "- 7002: ADVENTURE\n" +
    "- 7003: ARCADE\n" +
    "- 7004: BOARD\n" +
    "- 7005: CARD\n" +
    "- 7006: CASINO\n" +
    "- 7007: DICE\n" +
    "- 7008: EDUCATIONAL\n" +
    "- 7009: FAMILY\n" +
    "- 7011: MUSIC\n" +
    "- 7012: PUZZLE\n" +
    "- 7013: RACING\n" +
    "- 7014: ROLE_PLAYING\n" +
    "- 7015: SIMULATION\n" +
    "- 7016: SPORTS\n" +
    "- 7017: STRATEGY\n" +
    "- 7018: TRIVIA\n" +
    "- 7019: WORD\n\n" +
    "Magazine Subcategories:\n" +
    "- 13001: POLITICS\n" +
    "- 13002: FASHION\n" +
    "- 13003: HOME\n" +
    "- 13004: OUTDOORS\n" +
    "- 13005: SPORTS\n" +
    "- 13006: AUTOMOTIVE\n" +
    "- 13007: ARTS\n" +
    "- 13008: WEDDINGS\n" +
    "- 13009: BUSINESS\n" +
    "- 13010: CHILDREN\n" +
    "- 13011: COMPUTER\n" +
    "- 13012: FOOD\n" +
    "- 13013: CRAFTS\n" +
    "- 13014: ELECTRONICS\n" +
    "- 13015: ENTERTAINMENT\n" +
    "- 13017: HEALTH\n" +
    "- 13018: HISTORY\n" +
    "- 13019: LITERARY\n" +
    "- 13020: MEN\n" +
    "- 13021: MOVIES_AND_MUSIC\n" +
    "- 13023: FAMILY\n" +
    "- 13024: PETS\n" +
    "- 13025: PROFESSIONAL\n" +
    "- 13026: REGIONAL\n" +
    "- 13027: SCIENCE\n" +
    "- 13028: TEENS\n" +
    "- 13029: TRAVEL\n" +
    "- 13030: WOMEN"
  ),
  lang: z.string().optional().describe("Language code for result text. If not provided, uses country-specific language."),
  fullDetail: z.boolean().default(false).describe("Get full app details including ratings, reviews etc (default: false)"),
  country: z.string().default("us").describe("Country code (default: us)"),
  num: z.number().max(200).default(50).describe("Number of results (default: 50, max: 200)")
},

src/server.js:271-396 (registration)

Registration of the 'app-store-list' MCP tool using server.tool, providing description string, Zod schema, and inline async handler.

server.tool("app-store-list", 
  "Get apps from iTunes collections. Returns a list of apps with:\n" +
  "- id: App Store ID number\n" +
  "- appId: Bundle ID (e.g. 'com.company.app')\n" +
  "- title: App name\n" +
  "- icon: Icon image URL\n" +
  "- url: App Store URL\n" +
  "- price: Price in USD\n" +
  "- currency: Price currency code\n" +
  "- free: Boolean indicating if app is free\n" +
  "- description: App description\n" +
  "- developer: Developer name\n" +
  "- developerUrl: Developer's App Store URL\n" +
  "- developerId: Developer's ID\n" +
  "- genre: App category name\n" +
  "- genreId: Category ID\n" +
  "- released: Release date (ISO string)",
  {
    collection: z.enum([
      'newapplications',
      'newfreeapplications',
      'newpaidapplications',
      'topfreeapplications',
      'topfreeipadapplications',
      'topgrossingapplications',
      'topgrossingipadapplications',
      'toppaidapplications',
      'toppaidipadapplications'
    ]).describe(
      "Collection to fetch from. Available collections:\n" +
      "- newapplications: New iOS applications\n" +
      "- newfreeapplications: New free iOS applications\n" +
      "- newpaidapplications: New paid iOS applications\n" +
      "- topfreeapplications: Top free iOS applications\n" +
      "- topfreeipadapplications: Top free iPad applications\n" +
      "- topgrossingapplications: Top grossing iOS applications\n" +
      "- topgrossingipadapplications: Top grossing iPad applications\n" +
      "- toppaidapplications: Top paid iOS applications\n" +
      "- toppaidipadapplications: Top paid iPad applications"
    ),
    category: z.number().optional().describe(
      "Category ID to filter by. Available categories:\n" +
      "Main Categories:\n" +
      "- 6000: BUSINESS\n" +
      "- 6001: WEATHER\n" +
      "- 6002: UTILITIES\n" +
      "- 6003: TRAVEL\n" +
      "- 6004: SPORTS\n" +
      "- 6005: SOCIAL_NETWORKING\n" +
      "- 6006: REFERENCE\n" +
      "- 6007: PRODUCTIVITY\n" +
      "- 6008: PHOTO_AND_VIDEO\n" +
      "- 6009: NEWS\n" +
      "- 6010: NAVIGATION\n" +
      "- 6011: MUSIC\n" +
      "- 6012: LIFESTYLE\n" +
      "- 6013: HEALTH_AND_FITNESS\n" +
      "- 6014: GAMES\n" +
      "- 6015: FINANCE\n" +
      "- 6016: ENTERTAINMENT\n" +
      "- 6017: EDUCATION\n" +
      "- 6018: BOOKS\n" +
      "- 6020: MEDICAL\n" +
      "- 6021: MAGAZINES_AND_NEWSPAPERS\n" +
      "- 6022: CATALOGS\n" +
      "- 6023: FOOD_AND_DRINK\n" +
      "- 6024: SHOPPING\n\n" +
      "Games Subcategories:\n" +
      "- 7001: ACTION\n" +
      "- 7002: ADVENTURE\n" +
      "- 7003: ARCADE\n" +
      "- 7004: BOARD\n" +
      "- 7005: CARD\n" +
      "- 7006: CASINO\n" +
      "- 7007: DICE\n" +
      "- 7008: EDUCATIONAL\n" +
      "- 7009: FAMILY\n" +
      "- 7011: MUSIC\n" +
      "- 7012: PUZZLE\n" +
      "- 7013: RACING\n" +
      "- 7014: ROLE_PLAYING\n" +
      "- 7015: SIMULATION\n" +
      "- 7016: SPORTS\n" +
      "- 7017: STRATEGY\n" +
      "- 7018: TRIVIA\n" +
      "- 7019: WORD\n\n" +
      "Magazine Subcategories:\n" +
      "- 13001: POLITICS\n" +
      "- 13002: FASHION\n" +
      "- 13003: HOME\n" +
      "- 13004: OUTDOORS\n" +
      "- 13005: SPORTS\n" +
      "- 13006: AUTOMOTIVE\n" +
      "- 13007: ARTS\n" +
      "- 13008: WEDDINGS\n" +
      "- 13009: BUSINESS\n" +
      "- 13010: CHILDREN\n" +
      "- 13011: COMPUTER\n" +
      "- 13012: FOOD\n" +
      "- 13013: CRAFTS\n" +
      "- 13014: ELECTRONICS\n" +
      "- 13015: ENTERTAINMENT\n" +
      "- 13017: HEALTH\n" +
      "- 13018: HISTORY\n" +
      "- 13019: LITERARY\n" +
      "- 13020: MEN\n" +
      "- 13021: MOVIES_AND_MUSIC\n" +
      "- 13023: FAMILY\n" +
      "- 13024: PETS\n" +
      "- 13025: PROFESSIONAL\n" +
      "- 13026: REGIONAL\n" +
      "- 13027: SCIENCE\n" +
      "- 13028: TEENS\n" +
      "- 13029: TRAVEL\n" +
      "- 13030: WOMEN"
    ),
    lang: z.string().optional().describe("Language code for result text. If not provided, uses country-specific language."),
    fullDetail: z.boolean().default(false).describe("Get full app details including ratings, reviews etc (default: false)"),
    country: z.string().default("us").describe("Country code (default: us)"),
    num: z.number().max(200).default(50).describe("Number of results (default: 50, max: 200)")
  }, 
  async ({ collection, category, country, num, lang, fullDetail }) => {
    const results = await store.list({ collection, category, country, num, lang, fullDetail });
    return { content: [{ type: "text", text: JSON.stringify(results) }] };
  }
);

Tool Definition Quality

B3.1/5.0

Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. While it describes the return format thoroughly, it doesn't mention important behavioral aspects like rate limits, authentication requirements, pagination behavior (beyond the 'num' parameter), or whether this is a read-only operation. For a tool with 6 parameters and no annotation coverage, this represents significant gaps in behavioral transparency.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is perfectly structured and concise - a single introductory sentence followed by a clear bulleted list of return fields. Every element serves a purpose: the opening establishes the action, and the bullets provide essential output information. There's zero wasted text or redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with 6 parameters, no annotations, and no output schema, the description provides good coverage of the return format but misses important contextual elements. It doesn't explain behavioral constraints, usage patterns, or how this tool relates to its siblings. The output format documentation is thorough, but other aspects of tool context are underdeveloped given the complexity.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The description provides no parameter information beyond what's already in the schema. However, with 100% schema description coverage where all parameters have detailed descriptions, the baseline score is 3. The description doesn't add any additional parameter context, but the schema already does excellent work documenting each parameter's purpose and options.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Get apps from iTunes collections') and resource ('apps'), making the purpose immediately understandable. However, it doesn't explicitly differentiate this list-focused tool from its sibling tools like app-store-search or app-store-details, which would be needed for a perfect score.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance about when to use this tool versus alternatives. With multiple sibling tools available (app-store-search, app-store-details, etc.), there's no indication of when this collection-based listing is appropriate versus searching for specific apps or getting detailed information about individual apps.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Install Server

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