Loupe: free citation lookup

connects

loupe.legal

Check if a US legal citation exists, names its case and has a valid pin cite; or find a case. Free.

https://loupe.legal/mcp-publicWebsiteOAuthMCP 2025-11-25v0.1.0last checked 27 Sep 2026spoke MCP on 1 of 1 check (30 days)initialize in 1018 ms

Will my client connect?

Decided from what the probe found at the endpoint, and from what each client's own documentation says it can complete. Every row carries the day that documentation was read.

✓Claude CodeConnects

The authorization server advertises RFC 7591 registration, so Claude Code can register itself and sign you in through the browser.

claude mcp add --transport http loupe-free-citation-lookup https://loupe.legal/mcp-public

Claude Code docs · read on 2026-08-30

✓Claude (claude.ai & Desktop)Connects

The authorization server advertises RFC 7591 registration, so Claude (claude.ai & Desktop) can register itself and sign you in through the browser.

Settings → Connectors → Add custom connector, then paste https://loupe.legal/mcp-public.

Claude (claude.ai & Desktop) docs · read on 2026-08-30

✓ChatGPTConnects

The authorization server advertises RFC 7591 registration, so ChatGPT can register itself and sign you in through the browser.

Settings → Apps → Advanced settings → Developer mode, then create a connector pointing at https://loupe.legal/mcp-public.

ChatGPT docs · read on 2026-08-30

✓CursorConnects

The authorization server advertises RFC 7591 registration, so Cursor can register itself and sign you in through the browser.

{
  "mcpServers": {
    "loupe-free-citation-lookup": {
      "url": "https://loupe.legal/mcp-public"
    }
  }
}

Cursor docs · read on 2026-08-30

✓VS Code (Copilot)Connects

The authorization server advertises RFC 7591 registration, so VS Code (Copilot) can register itself and sign you in through the browser.

{
  "servers": {
    "loupe-free-citation-lookup": {
      "type": "http",
      "url": "https://loupe.legal/mcp-public"
    }
  }
}

VS Code (Copilot) docs · read on 2026-08-30

How to authenticate

Checked against the endpoint by our probe on 27 Sep 2026. These are the capabilities the server advertises, not a prediction about any particular client.

Scheme	OAuth
Issuer	https://loupe.legal
Dynamic client registration	✓Advertised (RFC 7591)
Client ID Metadata Document	✕Not advertised
PKCE	✓S256
Grant types	authorization_code, refresh_token
Scopes	citations:check
Protected-resource metadata	✓Published (RFC 9728)
Anonymous access	Handshake succeeds; 2 tools listable
Documentation	https://loupe.legal/

What the probe found

2 tools usable without signing in

The server exposes a public surface before authorization: check_citation, search_cases.

Tools

check_citationsearch_cases

Contract history

27 Sep 2026v0.1.0first recorded contract

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Status badge

Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.

[![MCP status](https://mcpi.app/servers/loupe-free-citation-lookup/badge.svg)](https://mcpi.app/servers/loupe-free-citation-lookup)