Watermelon UI
REMOTE · MCP.WATERMELON.SH · SCANNED OCT 4
Search free React, Tailwind, and shadcn components, blocks, and dashboards; get installable source.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security63
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement. View diagnostics → Unverified
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability70
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 388 tokens (~48/item across 8 items; 8 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management13
- Stability observed for 4 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage69
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 6% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (2026-07-28).Pass
How do I install the Watermelon UI MCP server?
Watermelon UI is a hosted endpoint at https://mcp.watermelon.sh/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · mcp.watermelon.sh
claude mcp add --transport http sh-watermelon-ui 'https://mcp.watermelon.sh/mcp'
{
"mcpServers": {
"sh-watermelon-ui": {
"url": "https://mcp.watermelon.sh/mcp"
}
}
} {
"servers": {
"sh-watermelon-ui": {
"type": "http",
"url": "https://mcp.watermelon.sh/mcp"
}
}
} [mcp_servers.sh-watermelon-ui] url = "https://mcp.watermelon.sh/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"sh-watermelon-ui": {
"type": "remote",
"url": "https://mcp.watermelon.sh/mcp",
"enabled": true
}
}
} openclaw mcp add sh-watermelon-ui --url 'https://mcp.watermelon.sh/mcp' --transport streamable-http
mcp_servers:
sh-watermelon-ui:
url: "https://mcp.watermelon.sh/mcp" {
"McpServers": {
"sh-watermelon-ui": {
"Transport": "http",
"Url": "https://mcp.watermelon.sh/mcp"
}
}
} assistant mcp add sh-watermelon-ui -t streamable-http -u 'https://mcp.watermelon.sh/mcp'
{
"mcpServers": {
"sh-watermelon-ui": {
"type": "http",
"url": "https://mcp.watermelon.sh/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 3 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.
- 1 Oct 26 +1
- Stability: unverified → 0.03 ▲ functional
- 30 Sept 26 63
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Oct 2026 · Probed https://mcp.watermelon.sh/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=watermelon.sh | CN=WE1,O=Google Trust Services,C=US | 30 Aug 2026 | 28 Nov 2026 | ECDSA 256 | ECDSA-SHA256 | bf15e285e96eb43513289af3c6a4e63a |
| SANs: watermelon.sh, mcp.watermelon.sh, *.mcp.watermelon.sh | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of mcp.watermelon.sh. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| sh. | present | 55297 | 8 | Verified |
| watermelon.sh. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://mcp.watermelon.sh/mcp | Verified | 200 | |
| http (plaintext) | http://mcp.watermelon.sh/mcp | Inconclusive | 405 |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
catalog_summary Catalog Summary ~19
Return top-level Watermelon catalog counts across content types.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
compose_page Compose Page Plan ~39
Create a source-backed page plan by selecting compatible Watermelon blocks for each requested section.
| Name | Type | Req | Description |
|---|---|---|---|
| prompt | string | yes | – |
| sections | array | – | – |
No output schema declared.
No examples provided.
get_catalog_entry Get Catalog Entry ~36
Compatibility alias for getting one Watermelon entry by kind and slug.
| Name | Type | Req | Description |
|---|---|---|---|
| kind | string | yes | – |
| slug | string | yes | – |
No output schema declared.
No examples provided.
get_component Get Component Source ~47
Get a Watermelon entry with preview, dependencies, install command, and source files when an installable registry item is available.
| Name | Type | Req | Description |
|---|---|---|---|
| kind | string | – | – |
| slug | string | yes | – |
No output schema declared.
No examples provided.
get_inspiration Get UI Inspiration ~50
Return 3-6 visually relevant Watermelon UI options for a design goal before choosing an implementation.
| Name | Type | Req | Description |
|---|---|---|---|
| kinds | array | – | – |
| limit | integer | – | – |
| prompt | string | yes | – |
No output schema declared.
No examples provided.
list_catalog_entries List Catalog Entries ~47
Compatibility alias for listing Watermelon entries by kind.
| Name | Type | Req | Description |
|---|---|---|---|
| category | string | – | – |
| kind | string | yes | – |
| limit | integer | – | – |
| query | string | – | – |
No output schema declared.
No examples provided.
list_categories List Categories ~31
List Watermelon UI categories and accurate entry counts, optionally for one catalog kind.
| Name | Type | Req | Description |
|---|---|---|---|
| kind | string | – | – |
No output schema declared.
No examples provided.
search Search UI Catalog ~66
Search the complete Watermelon UI catalog across components, animated components, blocks, dashboards, and templates.
| Name | Type | Req | Description |
|---|---|---|---|
| category | string | – | – |
| kinds | array | – | – |
| limit | integer | – | – |
| query | string | yes | Natural-language UI need, such as "animated pricing card". |
No output schema declared.
No examples provided.
What is the Watermelon UI MCP server?
Watermelon UI is an MCP server listed in the public MCP registry as sh.watermelon/ui. Search free React, Tailwind, and shadcn components, blocks, and dashboards; get installable source. This page covers its hosted endpoint (https://mcp.watermelon.sh/mcp).
Is the Watermelon UI MCP server safe to use?
Watermelon UI scores 65 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Watermelon UI MCP server expose?
Watermelon UI exposes 8 tools: search, get_component, get_inspiration, compose_page, list_categories, and 3 more. Their descriptions and schemas cost roughly 335 tokens of context every time the server is loaded.
Does the Watermelon UI MCP server require authentication?
No. We connected to Watermelon UI without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Watermelon UI MCP server still maintained?
Watermelon UI is still listed as active in the MCP registry. We last reached this channel on 4 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.