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Watermelon MCP server

Which MCP servers are Watermelon'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 2026-10-19

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Whose server it is
  • Registry namesh.watermelon/uiverified in the MCP registry

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

When we asked itchecked 2026-10-19
  • Stateanswerschecked 2026-10-19
  • Tools8
  • Server calls itselfwatermelon-mcp
  • Server version2.0.0
  • Protocol version2025-06-18

On 2026-10-19 the server answered initialize and tools/list without a sign-in. First answer in 407 ms.

Should an agent connect itSkip it
  • Its tools do none of the product's use cases we checked: Hire a design partner for product design and UX audits; Install open-source UI components into a web or mobile app.

Once connected

  • Parameters are untyped or undescribed in 7 of 8 tools: check arguments before calling.

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: 15, the first on 2026-10-19
  • INITE MCP score67 of 100answers 100 · does the job 0 · definitions 85 · context 100 · use 52 · connects 100
  • What an agent can do with it0 of 2 use cases
  • Use115 GitHub stars
  • Answered100% of days15 of 15 daily checks
  • Median first answer114 ms
  • Space in an agent's context≈ 831 tokensthe definitions of all its tools (8), which an agent carries on every turn
  • Tool definitionsB · 85 of 100
  • Typed results0 of 8 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 7 of 8

What an agent can do with it

  • cannot · Hire a design partner for product design and UX audits
  • cannot · Install open-source UI components into a web or mobile app
  • not sure · Build a consistent design system as the product grows

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 offers8 tools · read 2026-10-19
  • search

    Search the complete Watermelon UI catalog across components, animated components, blocks, dashboards, and templates.

  • get_component

    Get a Watermelon entry with preview, dependencies, install command, and source files when an installable registry item is available.

  • get_inspiration

    Return 3-6 visually relevant Watermelon UI options for a design goal before choosing an implementation.

  • compose_page

    Create a source-backed page plan by selecting compatible Watermelon blocks for each requested section.

  • list_categories

    List Watermelon UI categories and accurate entry counts, optionally for one catalog kind.

  • catalog_summary

    Return top-level Watermelon catalog counts across content types.

  • list_catalog_entries

    Compatibility alias for listing Watermelon entries by kind.

  • get_catalog_entry

    Compatibility alias for getting one Watermelon entry by kind and slug.

How to connect

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

{
  "mcpServers": {
    "ui": {
      "type": "http",
      "url": "https://mcp.watermelon.sh/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http watermelon https://mcp.watermelon.sh/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://mcp.watermelon.sh/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.