check_business_day — Holiday Calendar MCP Tool Read-only
check_business_day
(check business day) is one of 5 tools on the
Holiday Calendar
MCP server. Connect the server and your client discovers it on the handshake.
by client
How to call check_business_day from your client
- Claude Code Holiday Calendar check_business_day run in your project directory
- Claude Desktop Holiday Calendar check_business_day ~/Library/Application Support/Claude/claude_desktop_config.json
- Cursor Holiday Calendar check_business_day ~/.cursor/mcp.json
- VS Code Holiday Calendar check_business_day .vscode/mcp.json
- Zed Holiday Calendar check_business_day ~/.config/zed/settings.json
- Windsurf Holiday Calendar check_business_day ~/.codeium/windsurf/mcp_config.json
- Cline Holiday Calendar check_business_day ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json
- Gemini CLI Holiday Calendar check_business_day ~/.gemini/settings.json
- Grok Holiday Calendar check_business_day .mcp.json (in your project root)
- ChatGPT Holiday Calendar check_business_day Settings → Connectors → Advanced → Developer mode
- Claude.ai Holiday Calendar check_business_day Settings → Connectors → Add custom connector
- LangChain Holiday Calendar check_business_day pip install langchain-mcp-adapters
Fastest route
claude mcp add --transport http holiday-calendar https://starter.modernmustardseed.com/holidaysOther tools on this server
This list was read from the server itself, by connecting to it and calling tools/list on 12 October 2026. It is what
the server actually exposes, not what its listing claims.
Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.