Loupe: free citation lookup

legal.loupePublished by loupe.legalOfficial publisherv1.0.0Updated Oct 27, 2026

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

VerifiedStreamable HTTPWeb executableWeb Search & ScrapingKnowledge & Memory

Overview

AI-generated overview

Free remote MCP server that lets an assistant verify US legal citations and look up case names in Loupe's index.

What you can do
  • Check a single US legal citation, or a sentence containing a few, for existence in the sources Loupe checks, the case it names, and whether a pin cite falls inside the opinion.
  • Search case names in Loupe's index or look up the case a citation names, using party names and optionally the year.
When to use it
Useful when drafting or reviewing legal writing and you want a quick check that citations are real, correctly attributed and have plausible pin cites, or when you need to find a case by party name.
Requirements
Remote streamable HTTP endpoint at loupe.legal; no packages, environment variables, headers or authentication are declared.
Before you install
Results are limited to the sources Loupe checks, and a case missing from search results may still exist, so treat output as a check rather than legal authority. No credentials are requested.

Installation

In SourceWeft

  1. Open Loupe: free citation lookup in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/legal.loupe%2Fcitation-lookup/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

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

Tools

2

check_citation

Check a citation

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 attached to the wrong case.

Parameterscitationrequired

search_cases

Find a case by name

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.

Parametersyearqueryrequired

Version history

1
  1. v1.0.0LatestSep 27, 2026

Score

83% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.

Other Loupe integrations

Loupe: citation checker for US legal filings

legal.loupeOfficial publisher

Loupe checks every citation in a US legal filing — cases, statutes, quotations and links — so an assistant can verify them before you sign.

Streamable HTTPWeb executableAuth
Credential requiredNov 5, 2026