Changelog
What changed in the MCP server and the Data API, newest first: new endpoints and tools, changed parameters, and other changes that affect how you build.
Data API, September 2026
Data API
Added
Self-service API keys
Owners and Developers create and revoke keys and read usage per key and per endpoint under My organization, Data API. See API keys.
US deployment
Each key belongs to a region. Keys in the United States call
https://us.api.moonlit.ai; keys in Europe call https://api.moonlit.ai.Changed
Bearer authentication
Send the API key as
Authorization: Bearer YOUR_API_KEY. The Ocp-Apim-Subscription-Key header keeps working for existing integrations.MCP server, September 2026
MCP server
Added
Research guidance tool
get_research_guidance returns the moonlit-operator, moonlit-reasoning or moonlit-memo method (version 2.0.0). Free.Prompts
legal_research and legal_memo compose the same method for apps that list server prompts.Server instructions
The server tells the app which search to use, how to scope and read, and how to cite. See Tools.
Changed
Tools renamed
Seven tools carry new names; the old names keep working as aliases with the same parameters. The table is on Tools.
One hybrid search
search_legal_documents replaces the two hybrid variants and always reranks.Keyword syntax
Uppercase
NOT, parentheses and trailing or infix * wildcards are documented and supported.Source discovery
get_search_filters("sources") takes search, limit, complete and document_types; the keyword and citation searches take facet_limit.MCP server, July 2026
MCP server
Added
Moonlit account sign-in
Individuals connect by signing in with their Moonlit account. No key involved.
Organization MCP keys
Owners and Developer-role members create and revoke keys for deployed services under My organization, MCP keys.
Account status tool
get_account_status reports the plan and the calls used. Always free.Per-call metering
Searches, document reads and filter lookups cost one call each;
get_account_status and convert_to_celex are free. Organizations pool usage.All nine tools on every plan
No tool is gated by tier.
Data API v1.1, March 2026
Data API
Added
Sources filter
Limits results to an issuing body such as a court or a legislature.
Semantic portals endpoint
Lists the portals that support semantic search, so you check before you query.
Hybrid search
Merges keyword and semantic results with reciprocal rank fusion in one call.
Hybrid search with reranking
Adds a reranking pass over hybrid results for higher precision.
Changed
Facets are opt-in
Pass
facets: true to receive them. Responses without facets are smaller and faster.Semantic search parameters simplified
semanticK and semanticNumCandidates are computed from num_results.Field renames on search endpoints
nTypes became documentTypes; originatingBodies became sources.Field rename on document retrieval
NType became documentTypes in the response.Data API v1.0, September 2025
Data API
Added
Keyword and semantic search
Boolean keyword search and semantic search over the documents.
Document retrieval
Full text and metadata by document identifier.
Filter endpoints
Document types, jurisdictions and fields of law, for building valid queries.