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The UI Index MCP server

Which MCP servers are The UI Index's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-11-03

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Whose server it is
  • Registry namecom.theuiindex/screensverified in the MCP registry

The registry name sits under theuiindex.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-11-03
  • Stateanswerschecked 2026-11-03
  • Tools3
  • Server calls itselfthe-ui-index
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-11-03 the server answered initialize and tools/list without a sign-in. First answer in 137 ms.

Should an agent connect itNot proven either way yet
  • Its tools do every use case we checked: Compare how sites design the same screen type; Open a screen to see each reviewed element and its placement.
  • Checked on 2 of the 7 days it takes to judge reliability.

Once connected

  • For "Compare how sites design the same screen type", the likely first call is search_screens.
  • For "Open a screen to see each reviewed element and its placement", the likely first call is get_screen.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 2, the first on 2026-11-03
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 2 so far
  • What an agent can do with it2 of 2 use cases
  • Answeredmeasuring2 of the 7 daily checks it takes to print a share
  • Median first answer113 ms
  • Space in an agent's context≈ 628 tokensthe definitions of all its tools (3), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results0 of 3 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • can do · Compare how sites design the same screen type
  • not sure · Find screens by sector, typeface or brand colour
  • can do · Open a screen to see each reviewed element and its placement

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers3 tools · read 2026-11-03
  • search_screens

    Find real examples of website screens captured from live sites: login and sign-up pages, pricing pages, checkouts, carts, search results, home pages, forms with errors and more, on desktop and mobile, across sectors such as banking…

  • get_screen

    Read one captured screen by its id (from search_screens): site, device, type, sector, state, summary, the interface elements marked on it, a thumbnail and the link to the full screenshot on theuiindex.com.

  • list_screen_types

    List the screen types (login, pricing, checkout…), sectors (banking, software…) and interface states (form error, empty cart…) The UI Index uses, with how many screens each has. Use the keys as search_screens filters.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "screens": {
      "type": "http",
      "url": "https://theuiindex.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http theuiindex https://theuiindex.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://theuiindex.com/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.