Verify legal citations, case treatment, quotes and whole briefs against 10.7M U.S. opinions
Connect Remote server
claude mcp add --transport http legal-research https://mcp.syfert.com/mcp --header "Authorization: Bearer <YOUR_API_KEY>"{
"mcpServers": {
"legal-research": {
"url": "https://mcp.syfert.com/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}{
"servers": {
"legal-research": {
"type": "http",
"url": "https://mcp.syfert.com/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}Settings > Connectors > Add custom connector
URL: https://mcp.syfert.com/mcpReplace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools 22 found in our last check
search_casesFull-text search over 10.8M U.S. court opinions (all states + federal, via syfert.com). Call this to find case law on a topic, locate a case by name, or find cases citing a statute. Routing: a proposition or quoted language -> find_authority (pasted verbatim); a doctrine name or…
find_caseFast direct lookup: give a citation or a case caption and get THE case (or 'not decisive' with up to 5 candidates) without a full-text search. Use search_cases for topics and words. A citation ("384 U.S. 436", "Miranda v. Arizona, 384 U.S. 436, 444 (1966)", "449 F. App'x 901", "…
get_caseFetch one case: metadata, parallel citations, treatment flag, and full opinion text (paginated via offset/max_chars). cited_by is the number of opinions citing the case: CourtListener's count, or the syfert.com citation graph's when that finds more (cited_by_source: citation_gra…
check_citationVerify a legal citation actually exists before using it. CASES: returns the real case at that citation, its treatment flag, and whether the name matches: expected_case_name, or else a case name written in the citation itself ("Roe v. Wade, 410 U.S. 113"). This catches hallucinat…
verify_quoteCheck one quotation against the full text of the opinion it is attributed to, before it goes in quotation marks. Returns verdict (verbatim | near | absent), percent, best_match (the opinion's own sentence, up to ~600 characters), star_page (the last *page marker before it, null…
get_treatmentIs this case still good law? Returns the Syfertize treatment flag (red = overruled/superseded, yellow = questioned/distinguished, green = followed, procedural = cert/rehearing denied) plus the citing cases behind each signal with quoted context. A case can be green overall and r…
check_briefAudit ALL citations in a draft brief, motion, or memo at once (wraps syfert.com Brief Check). Extracts every reporter citation, verifies each exists, checks the case name the document claims against the real case (hallucination detection), checks each quoted passage word for wor…
get_propositionsWhat is this case actually cited FOR? Returns the distinct legal propositions courts cite the case for (headnote-grade), each with its OWN treatment flag and counts. A case can be good law on one proposition and overruled on another. Use before citing a case for a specific point…
get_citing_casesFull citator list: every ranked case citing this one, with judge-written parentheticals (usable verbatim in a brief), verbatim quotes, pin cites, and the citing court's own Bluebook signal. Filter by flag color. Best for FINDING SUPPORTING AUTHORITY and parentheticals; for compr…
find_related_casesExpand research from one good case: returns the doctrinal family it belongs to: the line of frequently co-cited cases around an anchor authority (curated set of ~1,500 major doctrinal lines; landmark cases only). Use when you have one on-point case and need the rest of the line.…
find_courtResolve a court name to court_id values usable in the search_cases court filter. Also resolves whole GROUPS of courts (tribal courts, veterans, bankruptcy, all U.S. district courts) to the single aggregate token that filters on all of them: see court_groups in the result. Each c…
search_quotesFind every case that has quoted a phrase. Phrase-matched search over 4.3M distinct passages quoted by two or more opinions, ranked by how many cases quote them. Use it to (a) find the true source of half-remembered language BEFORE attributing it, and (b) locate the canonical wor…
find_authorityFind the case to cite for a proposition. Paste the proposition or the language you need authority for VERBATIM; do not convert it to keywords. The result names the source case to cite (source_case), the verbatim passage, and how many courts have adopted it (quoted_by_cases); mat…
find_issuesENTRY BY ISSUE. Use this FIRST when the question arrives as facts or an issue rather than a case name ("can the appellate court affirm on a ground the trial court never reached", "impact rule emotional distress", "Fabre defendant"). Returns (1) the doctrine as courts in that STA…
search_statutesSearch statutes, COURT RULES and codes by citation or topic, for EVERY U.S. state plus federal. For a specific state, pass state="wi" (any two-letter code, all 50 states + DC) and a topic or section number; add kind="rule" for that state's court rules or kind="statute" for its c…
get_statuteFetch the full text of a statute, rule, or code section: the current codification in the edition this corpus holds. Every answer carries currency (edition, current_through, current_through_basis, last_verified, text_last_changed = when our copy last changed, last_amended_year, e…
suggest_treatmentCrowdsourced AI feedback on a Syfertize treatment flag. When the evidence in front of you (an overruling, abrogating or reinstating opinion, or a later court holding the case is still good law) shows a case's flag is wrong, propose red (no longer good law) or green (still good l…
export_documentOptional. If your client can save files locally and you want a readable copy of a case or statute, this returns the complete document to save; otherwise use get_case / get_statute as before. The document is the syfert.com page as the website renders it (caption, headings, footno…
context_detectorDoes the cited case actually say what the brief says it says? Call it after check_brief for every cite you rely on whose support_check says available, or for any sentence you want to test against the case it cites. Give the citation (reporter cite with its first page, or cluster…
brief_uploadSigned-in accounts only (a free account at https://syfert.com/mcp/; anonymous callers use check_brief with text). Upload a brief of any length for check_brief, in pieces. Send the text in order, about 40,000 characters (10k tokens) per call: the first call returns brief_id; each…
get_brief_resultsSigned-in accounts only (a free account at https://syfert.com/mcp/; anonymous callers use check_brief with text). Read the results of check_brief(brief_id) one page at a time (each page under ~20k tokens). section: corrections (ranked by severity), cites (one full row per citati…
brief_deleteSigned-in accounts only (a free account at https://syfert.com/mcp/; anonymous callers use check_brief with text). Delete an uploaded brief and its results from the server now (they are otherwise deleted after the last page is read, or after an hour idle).
Headers
| Name | Description |
|---|---|
AuthorizationRequired, secret | Bearer <token> - free tokens at https://syfert.com/mcp/ |
Details
| Endpoint | https://mcp.syfert.com/mcp (Streamable HTTP) |
| First published | 6 Nov 2026 |
| Last updated | 6 Nov 2026 |
| Registry name | com.syfert/legal-research |
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