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Which MCP servers are Loupe's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-26

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Whose server it is
  • Registry namelegal.loupe/citation-lookupverified in the MCP registry

The registry name sits under loupe.legal. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-26
  • Stateanswerschecked 2026-10-26
  • Tools2
  • Server calls itselfloupe-public
  • Server version0.1.0
  • Protocol version2025-06-18

On 2026-10-26 the server answered initialize and tools/list without a sign-in. First answer in 116 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 2 of the 7 days it takes to judge reliability.

Once connected

  • For "verify case citations and pin cites against published opinions", the likely first call is check_citation.
  • Parameters are untyped or undescribed in 2 of 2 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 2, the first on 2026-10-26
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 2 so far
  • Answeredmeasuring2 of the 7 daily checks it takes to print a share
  • Median first answer409 ms
  • Space in an agent's context≈ 235 tokensthe definitions of all its tools (2), which an agent carries on every turn
  • Tool definitionsB · 83 of 100
  • Typed results2 of 2 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 2 of 2

What an agent can do with it

  • can do · verify case citations and pin cites against published opinions
  • not sure · check quotations against the text of the cited opinion
  • not sure · confirm statutes and court rules are current before filing

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers2 tools · read 2026-10-26
  • check_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…

  • search_cases

    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.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

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

Add it

Claude Code, in a terminal

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

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://loupe.legal/mcp-public as a custom connector in the settings.

OpenAPI spec

3 paths, read 2026-10-26. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.