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Directory / Swatch
Swatch
by swatch.clawhard.com · https://swatch.clawhard.com/mcp
Check WCAG color contrast, fix failing colors, build 50-950 palettes. No account.
12 of 12 checks · 2 Nov 2026
Is Swatch MCP server safe?
- None of the hidden-instruction wordings we know were found in its tool descriptions.
- Its error messages showed no secrets or internal details.
- All 6 of its tools are labeled read-only.
- Overall it scored 95/100 on 2 Nov 2026.
A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.
What it can do
6 tools, in the server's own words.
swatch_check_contrastread-onlyUse when the user asks whether a color combination is readable or accessible, passes WCAG AA or AAA, or has enough contrast (text on a background, button, badg…
swatch_fix_contrastread-onlyUse when a color pair fails contrast and the user wants the smallest change that makes it pass, such as "make this gray text accessible without changing the lo…
swatch_pick_text_colorread-onlyUse when the user asks what text color (black or white) to put on a given background, button or brand color so it is readable.
swatch_make_scaleread-onlyUse when the user asks for a palette, shades, tints, a design-token scale or a Tailwind-style 50 to 950 ramp from a brand color.
swatch_convert_colorread-onlyUse when the user asks to convert a color between hex, RGB, HSL and OKLCH, or asks what a color is called or how light it is.
swatch_check_pairsread-onlyUse when the user has a whole design system, theme or stylesheet and wants every text and background pair checked for accessibility in one go.
Test results
Safe mode: only tools labeled read-only were run. How the test works
- !Ready for the newest MCP versionnote
1 warning
- !Uses an older MCP version (2025-11-25). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
- ✓ConnectsConnected in 204 mspass
- ✓Lists its toolsFound 6 toolspass
- ✓Every tool is describedAll 6 tools and their inputs are describedpass
- ✓Tools are labeled safe or dangerousEvery tool has a safety labelpass
- ✓No known hidden instructionsNone of the hidden-instruction wordings we know were found in tool descriptions. New wordings can get past this check.pass
- ✓Tools work with good inputspass
All good
- ✓swatch_check_contrast: Answered with an error, probably because of our sample input: Could not read the text color "test". Use hex like #1a1a1a, rgb(), hsl(), oklch() or a CSS name like "tomato".
- ✓swatch_fix_contrast: Answered with an error, probably because of our sample input: Could not read the text color "test". Use hex like #1a1a1a, rgb(), hsl(), oklch() or a CSS name like "tomato".
- ✓swatch_pick_text_color: Answered with an error, probably because of our sample input: Could not read the color "test".
- ✓swatch_make_scale: Answered with an error, probably because of our sample input: Could not read the color "test".
- ✓swatch_convert_color: Answered with an error, probably because of our sample input: Could not read the color "test". Use hex, rgb(), hsl(), oklch() or a CSS name.
- ✓swatch_check_pairs: Worked (19 ms)
- ✓Bad inputs give a clean errorpass
All good
- ✓swatch_check_contrast: Refused missing required input "foreground" with a clear error
- ✓swatch_check_contrast: Refused wrong type for "foreground" with a clear error
- ✓swatch_fix_contrast: Refused missing required input "foreground" with a clear error
- ✓swatch_fix_contrast: Refused wrong type for "foreground" with a clear error
- ✓swatch_pick_text_color: Refused missing required input "background" with a clear error
- ✓swatch_pick_text_color: Refused wrong type for "background" with a clear error
- ✓swatch_make_scale: Refused missing required input "color" with a clear error
- ✓swatch_make_scale: Refused wrong type for "color" with a clear error
- and 4 more
- ✓Fast enoughpass
All good
- ✓Connecting took 204 ms
- ✓Listing tools took 22 ms
- ✓Average tool answer: 32 ms
- ✓swatch_check_contrast: Slowest tool: swatch_check_contrast (46 ms)
- ✓No secrets leakedChecked 17 error messages: no secrets or internal detailspass
- ✓Follows MCP best practices (not scored yet)Tool names, safety labels and tool list size follow the MCP guidepass
- ✓Resources and prompts workpass
All good (6 resources, 1 prompt)
- ✓Opened 6 of 6 resources
- ✓An address that does not exist gets a clean "not found" error
- ✓Opened 1 of 1 prompts
- –Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)not tested
Test it yourself
Free and open source. Same checks, same score.
npx qamcp-cli https://swatch.clawhard.com/mcpShow this score on GitHub
Free for every server in the directory. Paste this into your README: the badge shows the score from our latest test.
[](https://qamcp.dev/s/com-clawhard-swatch.html)Score over time
- 2 Nov 202695
One test so far. New tests will show here.
Reviews
Coming soon: reviews from people who use Swatch, signed in with GitHub, one per person. Reviews never change the score.
QAmcp Monitor tests it every hour and emails you when it goes down, the score drops, a tool changes or a secret leaks. Free for 1 server, no card.
Have a concern, or want it removed? Ask us and we'll take it off the list. How the directory works