Swatch

com.clawhard/swatchclawhard.comstreamable-httpv1.0.1Scanned 2 hours ago

Check WCAG color contrast, fix failing colors, build 50-950 palettes. No account.

6 tools: 6 change things.

Reads private data · 0
Reads text others write · 0
Can send data out · 0
1 finding

Anlyon alternative

6 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

Import an OpenAPI spec →

Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

6 tools

Changes things 6Creates or changes something that can be changed back.Claude Code: ask

swatch_check_contrastUse 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, badge, link color).No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Use 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, badge, link color). Returns the exact contrast ratio, pass or fail for normal text, large text and UI components at AA and AAA, the APCA lightness contrast and a plain note. Colors can be hex, rgb(), hsl() or CSS names. Example: {"foreground": "#777777", "background": "#ffffff"}. Language models cannot compute this reliably, so call it instead of guessing.
Annotations the server declares
- title: Check the WCAG contrast of a text and background color
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
swatch_check_pairsUse when the user has a whole design system, theme or stylesheet and wants every text and background pair checked for accessibility in one go.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Use when the user has a whole design system, theme or stylesheet and wants every text and background pair checked for accessibility in one go. Takes up to 50 pairs and returns the ratio and AA and AAA results for each, with a count of failures. Example: {"pairs": [{"foreground": "#777", "background": "#fff", "label": "muted text"}, {"foreground": "#fff", "background": "#ff5a1f", "label": "button"}]}.
Annotations the server declares
- title: Check contrast for many color pairs at once
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
swatch_convert_colorUse 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.1 finding
Why it is in this group
- The name "swatch_convert_color" says "convert": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "swatch_convert_color" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "swatch_convert_color" says "convert": a word for a change.
  What this check looks for
Description, as the server wrote it
Use 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. Returns all formats, the relative luminance and the nearest CSS color name. Example: {"color": "#ff5a1f"}. Exact math, so prefer it to converting by hand.
Annotations the server declares
- title: Convert a color between hex, rgb, hsl and oklch
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
swatch_fix_contrastUse 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 look".No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Use 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 look". Returns the closest text color on that background that reaches the target (AA, AAA, AA-large or ui), and separately the closest background, keeping the hue. Example: {"foreground": "#777777", "background": "#ffffff", "target": "AA"}. Returns already_passes if nothing needs to change.
Annotations the server declares
- title: Find the nearest accessible color that passes contrast
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
swatch_make_scaleUse 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.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Use 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. Returns 11 steps that keep the hue, with the hex, contrast on white and on black, and the best text color for each step. Example: {"color": "#ff5a1f", "name": "brand"}.
Annotations the server declares
- title: Build a 50-950 color palette from one color
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
swatch_pick_text_colorUse when the user asks what text color (black or white) to put on a given background, button or brand color so it is readable.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Use when the user asks what text color (black or white) to put on a given background, button or brand color so it is readable. Returns the better of black or white with both contrast ratios, the WCAG grade and a softer near-black option. Example: {"background": "#ff5a1f"}.
Annotations the server declares
- title: Pick black or white text for a background
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or untrusted-input or outbound.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

1 warn

Warnswatch_convert_color
The server marks "swatch_convert_color" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "swatch_convert_color" says "convert": a word for a change.
What this check looks for

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 1.0.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http swatch https://swatch.clawhard.com/mcp

claude mcp add --transport http swatch https://swatch.clawhard.com/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__swatch__swatch_check_contrast",
      "mcp__swatch__swatch_fix_contrast",
      "mcp__swatch__swatch_pick_text_color",
      "mcp__swatch__swatch_make_scale",
      "mcp__swatch__swatch_convert_color",
      "mcp__swatch__swatch_check_pairs"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as swatch. Review it before you use it.

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/com.clawhard/swatch/verify?hash=715e13a045853502959a93a70058514085d70e383c5d88700ee861855744a061" | jq -e '.changed == false'

Pinned hash 715e13a04585, from Nov 2, 2026, 21:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/com.clawhard/swatch/changes.xml

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Badge

[![anlyon.dev](https://anlyon.dev/badge/com.clawhard/swatch.svg)](https://anlyon.dev/servers/com.clawhard/swatch)

Source: MCP Registry. Synced Nov 2, 2026, 22:17 UTC.