Japan Business Tools for Claude.ai

jp.ossalt/jp-biz-tools

Japanese holidays, business days, eras, postal codes, addresses and corporate numbers.

client:Claude.ai transport:streamable-http tools:11

Install Japan Business Tools in Claude.ai

Settings → Connectors → Add custom connector

https://biz.ossalt.jp/mcp

Claude on the web takes a remote URL and completes OAuth in the browser. For a packaged server use Claude Desktop or Claude Code instead. Claude.ai docs

What Claude.ai can do once it is connected

list_holidays
check_business_day
add_business_days
count_business_days
adjust_to_business_day
last_business_day_of_month
lookup_postal_code
search_postal_code
normalize_address
lookup_corporate_number
search_corporation_by_name

Japan Business Tools in other clients

Claude Code
Claude Desktop
Cursor
VS Code
Zed
Windsurf
Cline
Gemini CLI
Grok
ChatGPT
LangChain

Japan Business Tools MCP server