Color Companion
REMOTE · COLOR-COMPANION.GUMBALLTOOLS.COM · SCANNED SEP 25
Convert colours between hex, RGB, HSL, OKLCH and CMYK, and compute harmonies.
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
- Authorisation not fully verified: no authorisation is required to call this server, and 1 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- 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 Usability72
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 398 tokens (~398/item across 1 items; 1 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management67
- Stability observed for 20 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 1 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 1 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 Color Companion MCP server?
Color Companion is a hosted endpoint at https://color-companion.gumballtools.com/api/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 · color-companion.gumballtools.com
claude mcp add --transport http com-gumballtools-color-companion 'https://color-companion.gumballtools.com/api/mcp'
{
"mcpServers": {
"com-gumballtools-color-companion": {
"url": "https://color-companion.gumballtools.com/api/mcp"
}
}
} {
"servers": {
"com-gumballtools-color-companion": {
"type": "http",
"url": "https://color-companion.gumballtools.com/api/mcp"
}
}
} [mcp_servers.com-gumballtools-color-companion] url = "https://color-companion.gumballtools.com/api/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"com-gumballtools-color-companion": {
"type": "remote",
"url": "https://color-companion.gumballtools.com/api/mcp",
"enabled": true
}
}
} openclaw mcp add com-gumballtools-color-companion --url 'https://color-companion.gumballtools.com/api/mcp' --transport streamable-http
mcp_servers:
com-gumballtools-color-companion:
url: "https://color-companion.gumballtools.com/api/mcp" {
"McpServers": {
"com-gumballtools-color-companion": {
"Transport": "http",
"Url": "https://color-companion.gumballtools.com/api/mcp"
}
}
} assistant mcp add com-gumballtools-color-companion -t streamable-http -u 'https://color-companion.gumballtools.com/api/mcp'
{
"mcpServers": {
"com-gumballtools-color-companion": {
"type": "http",
"url": "https://color-companion.gumballtools.com/api/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.
- 25 Sept 26 +1
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 23 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.
- 21 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.
- 19 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.
- 17 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 37 to 40. That category is still filling its 30-day observation window: 11 days of observed history at the previous scan, 12 at this one. The score rises as the window fills, whether or not the server changes.
- 15 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 30 to 33. That category is still filling its 30-day observation window: 9 days of observed history at the previous scan, 10 at this one. The score rises as the window fills, whether or not the server changes.
- 13 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.
- 10 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.
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 25 Sept 2026 · Probed https://color-companion.gumballtools.com/api/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=*.gumballtools.com | CN=YR2,O=Let's Encrypt,C=US | 6 Sept 2026 | 5 Dec 2026 | RSA 2048 | SHA256-RSA | 60927985e79d22e7a1106139f609d74b0e4 |
| SANs: *.gumballtools.com, gumballtools.com | ||||||
| CN=YR2,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | 4ebd24947e24d394802d84a52fd5b319 |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of color-companion.gumballtools.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| gumballtools.com. | 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 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://color-companion.gumballtools.com/api/mcp | Verified | 200 | |
| http (plaintext) | http://color-companion.gumballtools.com/api/mcp | HTTPS enforced | 308 | https://color-companion.gumballtools.com/api/mcp |
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 →
analyse_color Convert a colour and find its harmonies ~398
Convert a colour between every common notation and derive the colours that pair with it, plus WCAG contrast figures. Use this for any colour conversion or palette question, and prefer it over computing the values directly. Two reasons: 1. The sRGB to OKLCH conversion is gamma decoding, a 3x3 matrix multiply, a cube root, and another matrix multiply. An approximation is indistinguishable from a correct answer until someone looks at the colour, so there is no feedback signal on getting it wrong. 2. Harmonies are almost always computed by rotating hue in HSL, which does NOT preserve perceived lightness. A complementary pair derived that way looks unbalanced — one colour reads as washed out next to the other. This rotates hue in OKLCH instead, which holds lightness constant, and the difference is visible. Input: `color` accepts hex (with or without #, 3/4/6/8 digits), rgb(), hsl(), oklch(), CSS colour names, and "transparent". Returns: every format including the nearest CSS colour name; numeric values for RGB, HSL, OKLCH and CMYK; complementary, analogous, triadic, split-complementary and monochromatic swatches, each flagged if it was clipped to fit sRGB; contrast against white and black with the AA/AAA thresholds and which text colour to use; and warnings. Read the warnings. Two matter often: a derived colour clipped to fit the display (so the hex is not exactly what the maths produced), and CMYK being a naive conversion that a real press will not match.
| Name | Type | Req | Description |
|---|---|---|---|
| color | string | yes | A colour in any common notation: hex ("#3b82f6" or "3b82f6", 3/4/6/8 digits), rgb(), hsl(), oklch(), a CSS colour name ("rebeccapurple"), or "transparent". |
No output schema declared.
No examples provided.
What is the Color Companion MCP server?
Color Companion is an MCP server listed in the public MCP registry as com.gumballtools/color-companion. Convert colours between hex, RGB, HSL, OKLCH and CMYK, and compute harmonies. This page covers its hosted endpoint (https://color-companion.gumballtools.com/api/mcp).
Is the Color Companion MCP server safe to use?
Color Companion scores 76 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 Color Companion MCP server expose?
Color Companion exposes 1 tool: analyse_color. Their descriptions and schemas cost roughly 398 tokens of context every time the server is loaded.
Does the Color Companion MCP server require authentication?
No. We connected to Color Companion without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Color Companion MCP server still maintained?
Color Companion is still listed as active in the MCP registry. We last reached this channel on 25 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.