io.github.RNVizion/rnv-color-mcp is an MCP server with 9 tools an agent can call, among them color_difference, contrast_check, convert_color. It answers at https://rnvizion-rnv-color-mcp.hf.space/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 6 of 6 times since 11 September 2026; the last check, on 20 October 2026, succeeded.
A complete color workflow over MCP: mix, convert, harmonize, measure, place, and remember palettes.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
color_difference | Perceptual difference (Delta-E) between two colors. color1 and color2 accept a hex, CSS name, RNV brand name, or saved-palette reference. method is 'ciede2000' (default, modern standard) or 'cie76'. A value near 1.0 is the threshold the eye Inputs: color1, color2, method |
contrast_check | WCAG contrast ratio between a foreground and background color, for accessibility. Both accept a hex, CSS name, RNV brand name, or saved-palette reference. Returns the ratio (1.0-21.0) plus pass/fail for AA and AAA at normal and large text s Inputs: foreground, background |
convert_color | Convert a color between formats. Input accepts a hex, CSS name, RNV brand name, or saved-palette reference. With `to` set to one of hex/rgb/hsv/hsl/lab, returns just that format; otherwise returns all of them. Read-only and deterministic, w Inputs: color, to |
generate_harmony | Generate a color harmony from a base color. base accepts a hex, CSS name, RNV brand name, or saved-palette reference (e.g. 'Spring line:2'). scheme is one of: complementary, analogous, triadic, split-complementary, tetradic (a.k.a. square), Inputs: base, scheme |
get_palette | Retrieve one saved palette by name, returning its colors and metadata. Returns null if no palette by that name exists. Read-only; no side effects. Use when you already know the palette name; to list available names first use list_palettes, Inputs: name |
list_palettes | List every saved palette as name + colors. Read-only; no side effects. Use to discover what palettes exist or to find a name before calling get_palette; to fetch one palette's full detail use get_palette, and to create or overwrite one use |
mix_colors | Blend up to 12 colors into one. Each color may be a hex (#d2bc93), a CSS name (red), an RNV brand name (brand gold, near-black), or a saved-palette reference (Spring line, or 'Spring line:2' for its 2nd swatch). Optional integer weights bia Inputs: colors, weights, mode |
save_palette | Persist a named color palette for later retrieval with get_palette or list_palettes. colors is a list of hex values; optional notes are stored as the palette's description. Author is recorded as RNVizion. This WRITES to the palette store an Inputs: name, colors, notes |
transform_text | Apply an exact, deterministic text transformation. operation is one of: UPPERCASE, lowercase, 'Title Case', 'Sentence case', camelCase, PascalCase, snake_case, CONSTANT_CASE, kebab-case, dot.case, 'iNVERTED cASE'. Read-only and deterministi Inputs: text, operation |
Every block below points at https://rnvizion-rnv-color-mcp.hf.space/mcp. Pick your client and copy.
claude mcp add --transport http io-github-rnvizion-rnv-color-mcp https://rnvizion-rnv-color-mcp.hf.space/mcp
{
"mcpServers": {
"io-github-rnvizion-rnv-color-mcp": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://rnvizion-rnv-color-mcp.hf.space/mcp"]
}
}
}{
"mcpServers": {
"io-github-rnvizion-rnv-color-mcp": {
"url": "https://rnvizion-rnv-color-mcp.hf.space/mcp"
}
}
}{
"servers": {
"io-github-rnvizion-rnv-color-mcp": {
"type": "http",
"url": "https://rnvizion-rnv-color-mcp.hf.space/mcp"
}
}
}{
"context_servers": {
"io-github-rnvizion-rnv-color-mcp": {
"url": "https://rnvizion-rnv-color-mcp.hf.space/mcp"
}
}
}{
"mcpServers": {
"io-github-rnvizion-rnv-color-mcp": {
"serverUrl": "https://rnvizion-rnv-color-mcp.hf.space/mcp"
}
}
}{
"mcpServers": {
"io-github-rnvizion-rnv-color-mcp": {
"url": "https://rnvizion-rnv-color-mcp.hf.space/mcp"
}
}
}name: io.github.RNVizion/rnv-color-mcp
version: 0.0.1
schema: v1
mcpServers:
- name: io.github.RNVizion/rnv-color-mcp
type: streamable-http
url: https://rnvizion-rnv-color-mcp.hf.space/mcp{
"mcpServers": {
"io-github-rnvizion-rnv-color-mcp": {
"httpUrl": "https://rnvizion-rnv-color-mcp.hf.space/mcp"
}
}
}{
"mcpServers": {
"io-github-rnvizion-rnv-color-mcp": {
"type": "http",
"url": "https://rnvizion-rnv-color-mcp.hf.space/mcp"
}
}
}{
"mcpServers": {
"io-github-rnvizion-rnv-color-mcp": {
"url": "https://rnvizion-rnv-color-mcp.hf.space/mcp"
}
}
}goose://extension?url=https%3A%2F%2Frnvizion-rnv-color-mcp.hf.space%2Fmcp&type=streamable_http&id=io-github-rnvizion-rnv-color-mcp&name=io.github.RNVizion/rnv-color-mcp
It answered our last check on 20 October 2026 in 245 ms. Over 6 checks since 11 September 2026 it answered 6. Status here comes from Neuronto's own probes, not from the publisher.
9, as returned by the server's own tools/list on 12 September 2026: color_difference, contrast_check, convert_color, generate_harmony, get_palette, list_palettes, mix_colors, save_palette, and 1 more.
It answered our last check on 20 October 2026 in 245 ms. Over 6 checks since 11 September 2026 it answered 6.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://rnvizion-rnv-color-mcp.hf.space/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: io.github.rnvizion. Endpoint host: rnvizion-rnv-color-mcp.hf.space. ARD identifier: urn:air:io.github.rnvizion:mcp:rnv-color-mcp.
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.