MCP server

Loupe: free citation lookup Official

legal.loupe/citation-lookup

Checked 28 Oct 2026, 09:03 UTC · Connected to it and listed its tools

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

Website

At a glance

Type

MCP server

Publisher

loupe.legal (verified by the MCP Registry)

Status

Working at last check

Tools

2

Token cost

About 268 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

28 Oct 2026, 09:03 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.citation-lookup]
url = "https://loupe.legal/mcp-public"

Gemini CLI

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

Cursor

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

VS Code

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

Antigravity

agy mcp add citation-lookup https://loupe.legal/mcp-public

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"citation-lookup","server_url":"https://loupe.legal/mcp-public","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"citation-lookup","server_url":"https://loupe.legal/mcp-public"}

Tools

• check_citation ~150 tokens
  Check one US legal citation, or a sentence holding a few: whether it exists in the sources Loupe checks, which case it is, and whether a pin cite falls inside the opinion. Give it exactly as written, with the case name and year if the document has them, because the commonest error is a real citation
• search_cases ~118 tokens
  Search the case names in Loupe's index, or look up the case a citation names. Give the parties' names, and the year if known. A case missing from the results may still exist.

Browse

• Legal research

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