Connect e-Gov Law Search to Claude Code
Query e-Gov Law Search directly from Claude Code. Arlet links the two through one MCP connection and takes care of API keys.
This server connects your AI client to the e-Gov Laws API (Version 2), the official database of Japanese legislation operated by the Digital Agency. It covers the Constitution, acts, cabinet orders, imperial orders, ministerial ordinances, and rules.
Key features:
- Find laws by title (partial match) or by law number, optionally filtered by law type.
- Run a full-text keyword search across the body text of all current laws and get matching sentence snippets.
- Fetch the text of a law as readable plain text. Long laws are truncated, so you can point at a specific article (e.g. MainProvision-Article_90) or request the text as it stood on a past date (asof).
- List a law's amendment history: amending laws, promulgation and enforcement dates, and future scheduled amendments.
The e-Gov Laws API is a public API provided free of charge by the Japanese government, so no API key or account is required. Results always reflect the official consolidated text published on e-Gov.
How to connect e-Gov Law Search to Claude Code
- 1
In the Arlet dashboard, open Data tools, find e-Gov Law Search and switch it on. No API key setup is needed.
- 2
In your terminal, run claude mcp add --transport http arlet https://mcp.arlet.dev/mcp/ to add Arlet as an MCP server.
- 3
Start Claude Code, run /mcp, select arlet and click Authenticate.
- 4
Your browser opens. Sign in with Google and click Allow on the consent screen. The connection is complete.
The connection is per user and works across every project on the same machine.