# CourtListener MCP Server Muse connector

From musedirectory.ai, the independent directory of Meta Muse connectors. Not affiliated with Meta.

## CourtListener MCP Server

Search US court opinions, dockets, judges, and oral arguments from CourtListener's free legal database.

- Record: https://musedirectory.ai/connector/courtlistener-mcp-server
- Category: Legal
- Developer: cyanheads
- Muse status: Extra setup. Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
- Health: Working, 1153ms, checked 2026-09-28T09:16:03Z
- Endpoint: https://courtlistener.caseyjhand.com/mcp
- Auth: No account needed; Pricing: unknown
- Screening: Screened, no issues found (2026-09-25T06:21:37Z)
- Source: Found in the official MCP Registry (io.github.cyanheads/courtlistener-mcp-server) https://registry.modelcontextprotocol.io/v0/servers?search=io.github.cyanheads%2Fcourtlistener-mcp-server

Connects to CourtListener to search 9M+ US court opinions, federal dockets, judge records, and appellate oral argument recordings. Muse can help legal professionals find case law, trace citation networks, research judges, and access judicial financial disclosures.

Example request: "Find all Supreme Court opinions citing Roe v. Wade and show me which ones have been most influential."

How to connect: Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use CourtListener MCP Server to help me. It is a free service with an MCP server at https://courtlistener.caseyjhand.com/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.

Tools:
- courtlistener_search_opinions: Full-text search across 9M+ written US court opinions with field-level filtering. Returns opinion cluster summaries with case metadata, citations, matched text snippets, and the individual opinion variants filed in each case. Supports CourtListener field syntax (caseName:"roe v w
- courtlistener_get_opinion: Fetch the full text and metadata for a single opinion cluster by cluster ID. A cluster groups all opinions filed in a case — majority, concurrence, dissent, and per curiam. Returns the cluster metadata (case name, court, citations, dates) plus every opinion variant with HTML and 
- courtlistener_get_citations: Retrieve the citation network for an opinion cluster. Supports two directions: "cited_by" (opinions that cite this one — measures precedential influence) and "citing" (opinions this one cites — reveals the authority chain relied on). This is the primary tool for tracing legal pre
- courtlistener_lookup_citation: Resolve legal citations (e.g., "410 U.S. 113", "93 S. Ct. 705") to opinion cluster IDs and case metadata. Enables workflows that start from a known citation rather than a search query. CourtListener extracts every citation it finds in the submitted text, so passing a passage retu
- courtlistener_search_dockets: Search RECAP federal court dockets. Query terms match case name, docket number, party, and attorney names; filters narrow by party name, court, and filing date. RECAP is a crowd-sourced mirror of PACER (the federal court filing system) — coverage varies by court and date. Returns
- courtlistener_get_docket: Fetch full docket metadata and entry list for a single federal case by docket ID. Returns all available docket entries with document availability status. Documents with is_available=true have a RECAP-stored copy; others require a PACER account. Obtain docket IDs from courtlistene
- courtlistener_get_parties: Fetch all parties and attorneys of record for a RECAP federal docket by docket ID. Returns each party's name, role (Plaintiff, Defendant, Petitioner, Respondent, etc.), and their attorneys with contact information, scoped to this docket. Costs two upstream requests per call (part
- courtlistener_search_judges: Search judge/person records by name, appointing president, court, political affiliation, or demographic. Returns biographical data, current position, and appointment summary. Use courtlistener_get_judge for full appointment history and education records.
- courtlistener_get_judge: Fetch full biographical profile for a single judge: positions on record — judicial appointments across all courts plus non-judicial roles — education, political affiliations, and ABA ratings. The position list is paginated upstream and walked under a page bound; the response repo
- courtlistener_lookup_courts: List courts with optional filtering by jurisdiction type, active/inactive status, and scraper coverage. Primarily used to discover court IDs for use in search and filter parameters across all other courtlistener tools. Defaults to the active bench — the courts CourtListener still
- courtlistener_search_oral_arguments: Search appellate oral argument audio recordings — the largest public collection of oral argument audio. Returns recording metadata with two direct MP3 links per result (download_url at the originating court, local_path for CourtListener's durable copy), panel judge IDs, and trans
- courtlistener_get_oral_argument: Fetch the full detail record for a single oral argument audio recording by its ID (the audio_id from courtlistener_search_oral_arguments). Returns the case name, panel judge IDs, duration, MP3 download URL, linked docket, and the speech-to-text transcript when transcription has c
- courtlistener_search_financial_disclosures: Search federal judicial financial disclosure filings — the annual reports judges file on investments, gifts, debts, outside positions, and income. Filter by judge (person ID from courtlistener_search_judges) and/or filing year; the year filter is applied to the fetched page only 
- courtlistener_get_financial_disclosure: Fetch a single judicial financial disclosure by ID with its parsed line-item rows — investments, debts, positions, reimbursements, non-investment and spouse income, agreements, and gifts. This is the itemized companion to courtlistener_search_financial_disclosures (which returns 

Screening checks:
- MCP handshake: pass (Answered in 365ms)
- Domain against threat feeds (Cloudflare security DNS): pass (courtlistener.caseyjhand.com not flagged)
- Published packages against the OSV malicious-package database: pass (No malicious-package advisories)
- Hidden instructions or invisible characters in tool text: pass (14 tools read, nothing found)
- Inputs asking for passwords, card numbers or seed phrases: pass (None found)
- Domain and redirects: pass (No redirects off the domain)
- AI review of purpose and tool behavior: pass (No concerns)