Color Companion
https://color-companion.gumballtools.com/api/mcp ↗
Description
Convert colours between hex, RGB, HSL, OKLCH and CMYK, and compute harmonies.
What our measurements say
Color Companion is a remote MCP server published at color-companion.gumballtools.com. It has been probed 8 times since 9/12/2026. It answered in 8 of them (100.0%), a near-uninterrupted record. Median response time is 1,308 ms, a delay an agent will notice. It offers a narrow, focused set of 1 tools. On the protocol side it speaks the 2026-07-28 stateless spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Tool name 'analyse_color' clearly indicates its purpose for color analysis.
- Describes comprehensive color conversion and harmony computation capabilities.
Weaknesses
- Description is truncated mid-sentence, creating ambiguity about functionality.
- Parameter 'color' lacks format examples (e.g., hex, RGB) needed for agent input validation.
- No documentation of error handling for invalid color inputs or conversion limitations.
analyse_color— Incomplete description truncates explanation of sRGB to OKLCH conversion process.analyse_color— Parameter 'color' does not specify acceptable input formats (e.g., hex, RGB, HSL).
Verdict
Event narrative
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Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 205ms → warm 167ms (penalty 38ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
analyse_colorConvert 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 differen
colorstringrequired
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Dual-era
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