Vaultcolor

Local color tools for AI agents. An MCP server that gives Claude, ChatGPT Apps, or any MCP host color conversion and accessibility math — running locally, nothing uploaded.

Part of the Vault family of privacy-first agent tools.

Tools

Free:

tool	what it does
color_convert	convert a color between hex / rgb / hsl
color_contrast	WCAG contrast ratio between two colors + AA/AAA pass

Pro (one-time license):

tool	what it does
color_palette	a 5-shade tints-and-shades palette from a base color
color_mix	blend two colors by a ratio

Zero external dependencies — pure Node. Nothing leaves the machine.

Run

npx github:AlexeySamosadov/vaultcolor-mcp

Use in Claude Desktop

{ "mcpServers": { "vaultcolor": { "command": "npx", "args": ["github:AlexeySamosadov/vaultcolor-mcp"] } } }

Pro license — one-time crypto, no subscription

Free tools work forever. To unlock Pro tools:

1. Send 9 USDC on Base to 0xe339997037C7e1C81829fA3e110d3e82B4bDd48E
2. Open an issue with your tx hash + email.
3. A bot verifies the payment on-chain and replies with your license key.
4. Set VAULTCOLOR_LICENSE in your MCP config env and restart.

Offline ECDSA-signed token — verified locally, never phoned home. MIT licensed.