Connect uml.singsk.com PlantUML and your agent gets 6 tools, among them decode_token, encode_source, get_syntax_reference. It answers at https://uml.singsk.com/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 2 of 6 times since 10 September 2026; the last check, on 19 October 2026, succeeded.
Render, validate, encode/decode PlantUML diagram-as-code; 22 diagram types. Free, no auth.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
decode_token | Recover the PlantUML source from a token or from any PlantUML render URL (the token is extracted automatically). Tokens use PlantUML's own 64-character alphabet ("0-9 A-Z a-z - _") over raw DEFLATE. This is NOT base64 - never encode or deco Inputs: encoded |
encode_source | Encode PlantUML source into a URL token and ready-to-use share/render URLs (svg + png). The result carries url_ok: GET URLs only work while the token is at most 16000 characters; when url_ok is false do not share the URLs - render with rend Inputs: text |
get_syntax_reference | Get the syntax reference entry for one diagram type: description, a render-verified example, and the help page URL. Use it to ground diagram generation. Inputs: type |
list_diagram_types | List the 22 supported diagram/reference types with a one-line description and the local syntax reference URL for each. Use it to pick the right @start directive. |
render_diagram | Render PlantUML source text to a diagram image. Returns a PNG image block (format "png") or the SVG markup as text (format "svg", default), plus the shareable render URL. The source is validated first: on a syntax error the result is an err Inputs: text, format |
validate_diagram | Check PlantUML source without rendering. Returns {ok:true, diagram_type} or {ok:false, error:{code, message, line, column, source_line, hint, diagram_type_detected, help}}. Cheap - call it in a generate -> validate -> fix loop before render Inputs: text |
Every block below points at https://uml.singsk.com/mcp. Pick your client and copy.
claude mcp add --transport http uml-singsk-com-plantuml https://uml.singsk.com/mcp
{
"mcpServers": {
"uml-singsk-com-plantuml": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://uml.singsk.com/mcp"]
}
}
}{
"mcpServers": {
"uml-singsk-com-plantuml": {
"url": "https://uml.singsk.com/mcp"
}
}
}{
"servers": {
"uml-singsk-com-plantuml": {
"type": "http",
"url": "https://uml.singsk.com/mcp"
}
}
}{
"context_servers": {
"uml-singsk-com-plantuml": {
"url": "https://uml.singsk.com/mcp"
}
}
}{
"mcpServers": {
"uml-singsk-com-plantuml": {
"serverUrl": "https://uml.singsk.com/mcp"
}
}
}{
"mcpServers": {
"uml-singsk-com-plantuml": {
"url": "https://uml.singsk.com/mcp"
}
}
}name: uml.singsk.com PlantUML
version: 0.0.1
schema: v1
mcpServers:
- name: uml.singsk.com PlantUML
type: streamable-http
url: https://uml.singsk.com/mcp{
"mcpServers": {
"uml-singsk-com-plantuml": {
"httpUrl": "https://uml.singsk.com/mcp"
}
}
}{
"mcpServers": {
"uml-singsk-com-plantuml": {
"type": "http",
"url": "https://uml.singsk.com/mcp"
}
}
}{
"mcpServers": {
"uml-singsk-com-plantuml": {
"url": "https://uml.singsk.com/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fuml.singsk.com%2Fmcp&type=streamable_http&id=uml-singsk-com-plantuml&name=uml.singsk.com%20PlantUML
It answered our last check on 19 October 2026 in 716 ms. Over 6 checks since 10 September 2026 it answered 2. Status here comes from Neuronto's own probes, not from the publisher.
Yes. It is published by singsk.com and served from uml.singsk.com, the vendor's own domain: https://uml.singsk.com/mcp.
6, as returned by the server's own tools/list on 6 October 2026: decode_token, encode_source, get_syntax_reference, list_diagram_types, render_diagram, validate_diagram.
It answered our last check on 19 October 2026 in 716 ms. Over 6 checks since 10 September 2026 it answered 2.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://uml.singsk.com/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: com.singsk. Endpoint host: uml.singsk.com. ARD identifier: urn:air:com.singsk:mcp:uml-plantuml.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.