RegAI Legal MCP (Taiwan) README

RegAI Legal MCP

Taiwan law and court decisions for your AI assistant: statutes, articles and rulings, read-only.

RegAI Legal MCP is a hosted Model Context Protocol server that gives AI assistants such as Claude and ChatGPT grounded access to Taiwan's laws and court decisions. Your assistant can search statutes by concept or keyword, fetch an article by number (with the official English translation where one exists), browse a law's structure, search apex-court decisions and Grand Chamber (大法庭) rulings, and list every decision that contains an exact phrase.

Endpoint: https://mcp.regai.tw/mcp (Streamable HTTP)
Website and setup guide: https://regai.tw/mcp
Security: https://regai.tw/mcp/security
Operated by: RegAI.tw

This repository holds the public documentation, the registry metadata (server.json) and examples. The server itself is a hosted service; its source code is not published here.

Tools

Tool	What it does
`search_law`	Search law articles by legal concept, keyword or article reference
`search_law_titles`	Resolve a full or partial law name to the official name(s)
`get_article_by_number`	Exact text of one article by law name + number (optionally the official English)
`get_law_hierarchy`	Chapter / section / article outline of one law
`get_law_details`	Full text of an entire law, as Markdown
`search_decisions`	Search court decisions by concept, fact pattern or keyword, ranked by relevance
`search_decisions_exact`	List every decision containing literal phrase(s), with the exact total
`get_decision_details`	Full text of one decision by its id (`jid`)
`search_grand_chamber_decisions`	Search Grand Chamber (大法庭) rulings that resolve divergent interpretations

Full parameters and examples: docs/tools.md.

All tools are read-only (annotated readOnlyHint: true) and query only public legal data. Queries and law names are in Traditional Chinese; your assistant translates for you if you ask in English.

Data

Laws and regulations: Taiwan's Ministry of Justice national law database (全國法規資料庫), including each law's effective status and pending amendments.
Court decisions: an apex-tier subset of Judicial Yuan decisions: the Supreme Court, Supreme Administrative Court, Constitutional Court, Disciplinary Court and Intellectual Property and Commercial Court, plus Grand Chamber rulings. District and high court decisions are not included.
Constitutional interpretations: all 813 Council of Grand Justices Interpretations (司法院大法官會議解釋, 釋字第1–813號), final constitutional interpretations equivalent in rank to today's Constitutional Court judgments, from the Constitutional Court (憲法法庭). They are returned by the decision tools next to court decisions; read one in full with get_decision_details using its jid or 釋字第812號.
Constitutional Court judgments: the Constitutional Court's judgments (憲法法庭判決, 憲判字; from 2022, judgments only), equal in rank to the interpretations and returned by the same tools; read one in full with get_decision_details using its jid or 111年憲判字第8號. Opinions and case files are links, not extracted.

The data is updated periodically from the official sources. RegAI is not affiliated with the Ministry of Justice or the Judicial Yuan. Results are for research and are not legal advice.

Get started

RegAI MCP supports OAuth (OAuth 2.1, the MCP authorization standard built on OAuth 2.0), so the recommended way to connect is to sign in with your RegAI account. No API key needed.

In Claude: RegAI Legal MCP is listed in Claude's connector directory: open claude.ai/directory/regai (or search "RegAI" under Customize → Connectors), click Connect and sign in. No URL to paste.

Sign in with OAuth (recommended). In other assistants, add a custom connector in your AI assistant with just https://mcp.regai.tw/mcp. The assistant opens RegAI's sign-in page (OAuth); sign in with your RegAI account (free; email code or LINE) and click Allow. Confirmed with Claude (web, Desktop, Claude Code), ChatGPT and Goose.

In Claude Code, one command (you sign in on first use):

Terminal

claude mcp add --transport http regai https://mcp.regai.tw/mcp

Or use an API key, for apps without sign-in support: copy your key from your account page and send it either

as a header: Authorization: Bearer YOUR_KEY, or
in the URL, for apps that only take a URL: https://mcp.regai.tw/mcp?key=YOUR_KEY

Step-by-step instructions for each app: examples/clients.md and https://regai.tw/mcp.

Then just ask, for example: 「民法第 184 條的內容是什麼？」 or "What does Taiwan's Civil Code say about tort liability? Cite the article." More in examples/prompts.md.

Plans and limits

	Free	MCP Pro
Calls per month	500	3,000
Burst	20, refills 5 per hour	60, refills 1 per minute
Card required	No	Yes

Connecting and listing tools are free; each tool call counts as one call. Current prices: https://regai.tw/pricing

Security and privacy

Read-only tools over public data only. Sign-in follows the MCP authorization spec (OAuth 2.1 with PKCE); access tokens last 1 hour and refresh tokens rotate on every use, and you can disconnect any app under "Connected apps" on your account page. API keys are matched by their hash (and stored encrypted so you can view yours again); you can regenerate or revoke your key at any time. We don't log the content of your queries, only a keyed fingerprint for troubleshooting. Details: SECURITY.md and https://regai.tw/mcp/security. Privacy policy: https://regai.tw/privacy.

Support

Contact: https://regai.tw/contact · service@regai.tw
Problems with these docs: open an issue in this repository.

License

Documentation and examples in this repository are licensed under CC BY 4.0. The RegAI service is provided under the RegAI Terms.

Claude is a trademark of Anthropic, ChatGPT of OpenAI; other product names belong to their owners. They are mentioned only to describe compatibility.