> ## Documentation Index
> Fetch the complete documentation index at: https://docs.arlet.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Use Arlet's tools

> How to use Arlet's catalog of MCP servers with a single switch

Beyond building your own, Arlet provides an **official catalog of ready-to-use MCP servers**. For many of them Arlet obtains and manages the API key, so you just flip a switch to start using them. Only the servers whose provider requires a contract or a per-user registration need your own API key; those cards show **API key required** and cannot be switched on until you set the key.

## What's in the catalog

* **Government (Japan)**: e-Stat (official statistics), e-Gov (law search and data portal), EDINET (corporate filings), gBizINFO, corporate number search, JMA (weather, warnings, earthquakes), WBGT heat index and heatstroke alerts, J-SHIS (earthquake hazard), PLATEAU (3D city models), Real Estate Information Library, MLIT Data Platform, public procurement portal, Mirasapo Plus
* **Government (United States, EU, South Korea, Taiwan)**: United States (FRED, BEA, BLS, Census, SEC EDGAR, Federal Register, eCFR, GovInfo, Congress.gov, USPTO, USASpending, SAM.gov, openFDA), EU (EUR-Lex, Eurostat, TED), Korea (OpenDART), Taiwan (GCIS, TWSE)
* **International organisations**: IMF, OECD, World Bank, GLEIF (LEI)
* **Transport**: Japanese bus timetables (GTFS), Japanese road traffic volumes, public transport data (ODPT), Transport for London (TfL)
* **Healthcare**: research tools for health, nutrition, psychology, sports science, and strength training
* **Finance**: J-Quants (equity data)
* **Simulation**: population simulator (Japan)
* **LLM**: Ask Claude, Ask GPT, Ask Gemini
* **Security**: MCP Security Audit (checks the third-party MCP servers connected to your AI client — see [Audit your MCP servers](/how-to-use/security-audit))

For the current set of tools, check [the Arlet tools list in the product](https://app.arlet.dev/catalog).

## How to use

1. Open **Arlet tools** from the sidebar on the [Dashboard](https://app.arlet.dev/)
2. Turn on the switch for the servers you want to use. For servers that need a key, open the card and set the key first
3. That's it — the server's tools become available from any AI client connected to Arlet MCP