Japan Business Tools MCP

This MCP server provides access to Japanese business utilities including national holidays, business day calculations, Japanese era (wareki) conversions, postal code lookups, address normalization, and corporate number searches. It enables agents to handle date-sensitive logic and address validation specific to Japan.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-18Operated by Ossalt

MCP endpoint (Streamable HTTP)

https://biz.ossalt.jp/mcp

Vendor documentation

What you can do with it

Check if a specific date is a Japanese national holiday
Calculate business days between two dates
Convert Gregorian dates to Japanese era (wareki)
Normalize Japanese addresses or lookup postal codes

Tools advertised by the last live check:

list_holidays
check_business_day
add_business_days
count_business_days
adjust_to_business_day
last_business_day_of_month
to_japanese_era
from_japanese_era
lookup_postal_code
search_postal_code
normalize_address
lookup_corporate_number
search_corporation_by_name

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http japan-business-tools-mcp https://biz.ossalt.jp/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add japan-business-tools-mcp --url https://biz.ossalt.jp/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable japan-business-tools-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "japan-business-tools-mcp": {
      "url": "https://biz.ossalt.jp/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "japan-business-tools-mcp": {
      "type": "streamableHttp",
      "url": "https://biz.ossalt.jp/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start japan-business-tools-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "japan-business-tools-mcp": {
      "type": "http",
      "url": "https://biz.ossalt.jp/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http japan-business-tools-mcp https://biz.ossalt.jp/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "japan-business-tools-mcp": {
      "url": "https://biz.ossalt.jp/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "japan-business-tools-mcp": {
      "serverUrl": "https://biz.ossalt.jp/mcp"
    }
  }
}

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