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Jus AI by Jus Mundi (Light Mode)
Ask international arbitration and public international law questions, with verified citations.
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What the Jus AI by Jus Mundi (Light Mode) connector does
The Jus Mundi MCP server connects Jus AI — a research assistant over the world's largest curated international arbitration corpus — to Claude, ChatGPT and any MCP-compatible agent. It exposes one read-only tool that takes a legal question and returns a cited answer. Sign-in is OAuth 2.0, and an active Jus AI subscription is enforced on every call.
Verified connector
Listed by Anthropic as a partner connector in its Connectors Directory.
Connection checked by Agentman on .
Anthropic states this reflects the level of review a connector received, not a security audit.
Jus AI by Jus Mundi (Light Mode) tools (1)
- legal_research
Tool names from Anthropic's directory listing. This server requires sign-in, so we could not read tool descriptions or parameter schemas.
Limits
- We could not verify the auth posture ourselves. Cloudflare returned HTTP 403 to every request to
mcp.jusmundi.com, including a single anonymousinitializeand the RFC 9728 metadata path, so we never saw the documented 401 challenge. Everything on this page about OAuth, scopes and the subscription check comes from Jus Mundi's written reference, not from our observation — which is whyauthVerifiedis false. Anthropic's own directory probe recorded the same 403. - The scopes are documented, not observed.
openidandmcp:tools:legal_researchare what Jus Mundi publishes as its descriptor'sscopes_supported. We could not fetch the live document to confirm the published copy is current. - The authorization server is not published. The reference redacts the issuer to
<keycloak_issuer>, and no candidate hostname resolves. - No parameter detail beyond one string. The gated endpoint means no live schema, no safety annotations, and no
promptsorresourcescapability check. Anthropic's directory does not record a real prompt list for this server either — its field holds the literal string "None" rather than an empty list, one of only 13 such entries in the snapshot, which is a data-entry artefact rather than a measurement. A capability we could not probe is unknown, not absent, and the correct arbiter would be the server's owninitializecapability block. - The MCP reference publishes no coverage statement. It says nothing about which jurisdictions, date ranges, languages or document types the corpus reaches. Jus Mundi's product pages do carry corpus figures, but they describe the platform rather than the connector, and nothing states that the connector reaches all of it. Absence of a result is not evidence of absence in the corpus.
- Usage caps probably exist but are not published. The Jus AI web app's own client state carries an
uploadLimitsstructure with per-period, per-thread and vault fields, so the product meters something. No published figure covers the MCP server, and no tool can read a limit. - The binding contract is not public. We read the User Terms and privacy policy from archived copies, but they defer throughout to a Subscription Agreement and a DPA that Jus Mundi does not publish. Seat definitions, audit rights, any survival or liquidated-damages clause, and any MCP-specific permission sit in those documents. Whether an AI agent counts as the single User an account is licensed to is not answerable from the public text.
- The live legal pages were unreachable.
jusmundi.comreturned Cloudflare HTTP 403 to every request on 2026-08-23, so every licence and privacy claim on this page comes from a Wayback Machine copy. The terms carry an effective date of 15 November 2023; a newer unarchived revision could exist. - No rate limit, quota or price is published, and no tool can observe usage.
- This is the "Light Mode" listing, and Light is the shallowest of four modes. Jus Mundi's Jus AI page advertises "Four reasoning modes — Auto, Light, Think, and Deep — built to match every level of complexity". The connector exposes Light; Think and Deep are not reachable through it, and Jus Mundi publishes the mode names without specifying what each does. Do not assume connector answers match what the Jus AI web product returns at a deeper setting.
- The vendor reference carries machine-generation markers. 47 of the 86 content blocks on Jus Mundi's Notion page share a single Notion
ai_run_id, so the document was substantially AI-drafted. Its own footer reads "Last updated: 2026-03-14" while Notion's metadata records the page as created 2026-04-22 and last edited 2026-05-06 — the stated date precedes the page's existence. Treat it as a good-faith reference with an unreliable date rather than a specification.
Frequently asked questions
How many tools does the Jus Mundi MCP server have?
One, and both sources agree. Anthropic's directory lists a single name, legal_research, and Jus Mundi's own API reference documents exactly that one tool with one required string parameter. This is a literal-string match in both directions, which is the strongest Reverse-Honeycomb result available and rarer than a clean tool count suggests.
Is the Jus Mundi connector a dispatcher that hides a wider API?
No, on the evidence available. Its single parameter is a free-text query, not a service, method or action selector, so no argument routes to a wider API. But the free text does reach an agentic research backend that plans its own steps, so the surface is bounded by what that backend can read rather than by a schema.
What OAuth permissions does the Jus Mundi MCP server request?
Two, and one of them is a real boundary. Jus Mundi documents scopes_supported as openid and mcp:tools:legal_research. The second names the single tool it guards, so unlike the identity-only scope lists common across this catalogue, the grant actually corresponds to a capability rather than to who you are.
Does the Jus Mundi connector need a paid subscription?
Yes, and the server enforces it on every call. After validating your token, Jus Mundi exchanges it with Keycloak for a Requesting Party Token and requires a permission entry to be present, which it states verifies an active Jus AI subscription. Without it the server returns HTTP 403 permission denied rather than a partial result.
Does Jus Mundi's licence allow feeding its data to an AI model?
Not in general, and the connector is the exception. Its User Terms forbid using the materials to train a machine learning or AI system, forbid storing them in any archival or searchable database, and formally reserve text-and-data-mining rights under French law. Jus Mundi operating this server itself is what makes sanctioned use legitimate.
Can the Jus Mundi connector write, upload or delete anything?
No. The one tool takes a research question and returns an answer, and no create, update, delete or upload verb appears in the listing or the vendor reference. The server also runs stateless, persisting no session between requests, so there is nothing an agent can accumulate or leave behind on Jus Mundi's side.
What personal data can the Jus Mundi connector return?
Names of real people, unavoidably. Arbitration awards and court decisions identify parties, arbitrators, counsel and expert witnesses in their text, and the tool returns excerpts from cited documents alongside the answer. That is the corpus working as intended, but it means real personal data enters your agent's context on ordinary queries.
Does every Jus Mundi answer cost money or credits?
No published rate exists, and nothing in the surface can check. Jus Mundi documents no per-call price, credit balance or quota for the MCP server, and the single tool exposes no billing, usage or balance operation. Access is gated by subscription rather than metered per call on the evidence we could read.
Why can I not reach the Jus Mundi MCP endpoint directly?
Cloudflare blocks non-browser clients ahead of the server. Every path we requested returned an identical HTTP 403 interstitial, including the OAuth metadata document, so we could not observe the authentication challenge ourselves. Anthropic's own directory probe recorded the same block, so the behaviour is the host's and not specific to our client.
Sources
- Jus Mundi, "Jus AI — MCP Server API Reference" (retrieved 2026-08-23). The page is a JavaScript shell that yields zero words to a text extractor; its content was recovered through Notion's
loadPageChunkAPI for page34a7ed25-e4c9-80aa-a6cf-dbda241dc0b0. All 86 blocks returned in one chunk with no collapsed toggles and no unresolved references, so the recovered document is complete. · retrieved 2026-08-23 - Live wire check, 2026-08-23: one anonymous
initializePOST tohttps://mcp.jusmundi.com/, plus the RFC 9728 paths/.well-known/oauth-protected-resourceand/.well-known/oauth-authorization-serverand two control paths. All returned an identical Cloudflare 403 interstitial; nowww-authenticateheader was present. DNS checks forauth,sso,keycloak,idandloginatjusmundi.comreturned NXDOMAIN. · retrieved 2026-08-23 - Doc-route probe, 2026-08-23:
llms.txtonjusmundi.notion.sitereturns 786 words of Notion's own corporate marketing copy, not Jus Mundi content — a false positive that scores well on word count.llms-full.txt, the.mdsuffix route andsitemap.xmlall return Notion's application shell or Notion's own sitemap. OnlyloadPageChunkrecovered the vendor's document. · retrieved 2026-08-23 - Anthropic Connectors Directory entry — , read from our directory snapshot dated 2026-08-16. Records one tool name, partner tier, and a probe result of
blocked-htmlHTTP 403. · retrieved 2026-08-16 - Jus Mundi, "Jus AI" product page — archived copy at (retrieved 2026-08-23). Source for the four reasoning modes, the document-upload feature, the SOC 2 Type II claim, and the
uploadLimitsclient-state fields. · retrieved 2026-08-23 - Jus Mundi User Terms, effective 15 November 2023 — archived copy at (retrieved 2026-08-23). Source for the Section 7.2 TDM reservation under French IP Code Article L. 122-5-3, the Section 8.1 AI-training and archival-database prohibitions, the Section 4.2 single-User account rule, and the Section 5.3 attribution condition. The live page 403s; this is an archived copy and a newer revision may exist. · retrieved 2026-08-23
- Jus Mundi privacy policy (updated 3 June 2025) and sub-processors page — read from Wayback Machine copies (retrieved 2026-08-23). Source for the legitimate-interest basis covering legal professionals, the ongoing pseudonymisation of witnesses and natural-person parties, and the sub-processor table naming Microsoft Azure OpenAI Services in the EU with Anthropic absent. · retrieved 2026-08-23
- Jus Connect profile documentation, read from a Wayback Machine copy (retrieved 2026-08-23): the six profile types and the statement that profiles are automatically generated from public case documents. · retrieved 2026-08-23
- Jus Mundi — · Support — <mailto:care@jusmundi.com> · Privacy — . Every jusmundi.com URL returned Cloudflare HTTP 403 to every request on 2026-08-23, including the terms of use and privacy policy. These are cited as the vendor's nominated locations, not as pages we read; the substantive Jus Mundi facts above come from archived copies instead. · retrieved 2026-08-23
- Jus Mundi's nominated MCP page at
jusmundi.com/en/ai-mcp-integrationscould not be read — the live host 403s and the Wayback Machine holds no capture of it.
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