Kitbench MCP

Kitbench provides an MCP server exposing seven specialized calculators for Japanese-specific tasks, including character counting with manuscript paper logic, business day calculations using Japanese holidays, Japanese era (wareki) conversion, and consumption tax computation. It allows AI agents to perform precise date and text operations that LLMs often struggle with, offering a free, no-sign-up endpoint for integration with assistants like Claude.

Endpoint and access

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

No sign-inEndpoint checked 2026-10-19Operated by Kitbench

MCP endpoint (Streamable HTTP)

https://kitbench.net/mcp

Vendor documentation

What you can do with it

Count characters in Japanese text including manuscript paper sheets
Calculate business days between dates using Japanese holidays
Convert Western years to Japanese era dates (wareki)
Calculate age based on Japanese counting methods

Tools advertised by the last live check:

count_characters
days_between
add_days
calculate_age
convert_japanese_era
consumption_tax
convert_units

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 kitbench-mcp https://kitbench.net/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 kitbench-mcp --url https://kitbench.net/mcp

Cursor

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

Cursor configuration

{
  "mcpServers": {
    "kitbench-mcp": {
      "url": "https://kitbench.net/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": {
    "kitbench-mcp": {
      "type": "streamableHttp",
      "url": "https://kitbench.net/mcp",
      "disabled": false
    }
  }
}

VS Code

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

VS Code configuration

{
  "servers": {
    "kitbench-mcp": {
      "type": "http",
      "url": "https://kitbench.net/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 kitbench-mcp https://kitbench.net/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": {
    "kitbench-mcp": {
      "url": "https://kitbench.net/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": {
    "kitbench-mcp": {
      "serverUrl": "https://kitbench.net/mcp"
    }
  }
}

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