Name: Lexiara
Author: lexiara

Lexiara MCP

Provenance-backed EU and UK legislation for AI agents, addressable to the individual provision.

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What it does

Provenance-backed EU and UK legislation for AI agents, addressable to the individual provision.

Quickstart

# 1 — add it to Claude Code
claude mcp add --scope user --transport http lexiara-mcp https://lexiara.org/mcp

# 2 — ask your agent for something these tools do
#   search, fetch, lookup_provision and 28 more

Lexiara costs nothing on mcprush: there is no plan to choose here, no cap to set and nothing mcprush can bill you for.

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Tool surface

What the model actually sees. Descriptions are diffed on every release — see version history.

Only tools that write or reach the network

Search Lexiara's bounded EU and UK legislation corpus. Returns compact, citable results with opaque ids; pass an id unchanged to fetch for the provision text and provenance.

Parameter	Type	Required	Notes
query	string	yes	Natural-language or keyword search over legislation.

Retrieve one search result by its opaque id, including provision text, canonical URL, authority status and source provenance. metadata.structure provides parent/child addresses; an empty container text does not mean the law is absent. Use child apiHref links or lookup_provision with sourceLang to traverse. Use ids returned by search without editing them.

Parameter	Type	Required	Notes
id	string	yes	Opaque identifier returned by the search tool.

Authoritative text of one provision, with in-force window, repealed/prospective status, concept tags, transposition edges and full provenance. stand says what date the served text speaks as of (consolidated with a date, as-adopted, or unknown) and carries the one-line sentence to show a reader — answer questions about currency from it, not from inForce, which is when the version's vali

Parameter	Type	Required	Notes
work	string	yes	ELI URI of the instrument, e.g. 'http://www.legislation.gov.uk/id/ukpga/1994/23' (UK VAT Act 1994) or 'http://data.europa.eu/eli/dir/2006/112/oj' (EU VAT Directive).
eId	string	yes	Provision identifier: 'sec_4' (section 4), 'art_2__para_1' (article 2(1)), 'sch_9' (Schedule 9). Use search or history endpoints to discover eIds.
expression	string	no	Optional exact expression UUID from list_work_versions or an ingestion result handle. Preserves the selected expression and language; use only a handle returned by Lexiara.
sourceLang	string	no	Stored three-letter source language, e.g. eng or fra. Selects held text, never generates translation.
asAt	string	no	Optional real calendar date YYYY-MM-DD. Text is returned only from a held expression whose explicit validity window covers that day; otherwise date_not_covered is returned. Omit for current text.

Find same-language publisher expressions for one EU act. Each entry has an exact expression ID, source hash and a consolidation marker or as-adopted label. These markers identify text; they do not prove when it applied. Pass a returned expression ID to lookup_provision to read that exact text. Use asAt only when the source carries an explicit validity window.

Parameter	Type	Required	Notes
work	string	yes	ELI URI of the instrument, e.g. 'http://www.legislation.gov.uk/id/ukpga/1994/23' (UK VAT Act 1994) or 'http://data.europa.eu/eli/dir/2006/112/oj' (EU VAT Directive).
sourceLang	string	no	Optional held three-letter EU source language, e.g. fra or ita.

Ranked full-text search over provision text. Results carry work, eId, status and provenance — feed a hit's work+eId to lookup_provision for the complete payload.

Parameter	Type	Required	Notes
query	string	yes	Search terms, e.g. 'zero-rating of food'.
jurisdiction	string	no	ISO country filter, e.g. 'UK', 'FR', 'EU'.
language	string	no	Restrict to a text language, e.g. 'eng'.
limit	number	no	Maximum hits, default 10.

Research source-bound EU role requirements with exact passages, act-specific definitions, conditions, unknown facts and EN/FR/DE/IT official source availability. Select multiple roles and an optional activity, product, Spain or France, and date. Country links carry their relationship type and review state. Informative national text appears only as a separate research lead, not verified country cov

Parameter	Type	Required	Notes
work	string	no	Optional legislation ELI; scope candidates and legal roles to this act.
term	string	no	Optional actor label or exact phrase in a candidate quotation. Discovery only; shared labels do not equate legal definitions or establish applicability.
roles	string	no	Comma-separated scoped role keys, e.g. crd:trader,gpsr:manufacturer. Omit to see all current candidates.
activity	string	no	Activity from the response catalogue, e.g. selling-online.
product	string	no	Product from the response catalogue, e.g. consumer-goods.
country	string	no	ES or FR for national connections.
asAt	string	no	YYYY-MM-DD; only source-supported dates are shown.

List private role and country research views belonging to the connected account. Each view is a snapshot for comparison, not a compliance verdict. Read-only; saving and deleting views require a person's own HTTP account access.

No parameter schema on file.

Recheck current official passages and connections against a private saved view. The change list separates later publisher versions, parser corrections, newly acquired material and review status; inspect the cited current result before relying on a connection. Read-only.

Parameter	Type	Required	Notes
id	string	yes	UUID returned by list_saved_role_views.

The cross-reference neighbourhood of a provision plus its amendment history. Use this when a provision's relevance is not on its face: a duty that says 'the information referred to in Article 6(1)' is silent about what that information now includes, and about which amending act put it there. Returns citations both ways and the amending acts marked on this provision and on the ones it cites. `cited

Parameter	Type	Required	Notes
work	string	yes	ELI of the instrument.
eId	string	yes	Provision identifier, e.g. 'art_7__para_1'.

The definition of a term of art, and the provision that gives it. Ask this BEFORE search_legislation whenever the question is what a phrase means ('durable medium', 'taxable person'): search returns provisions that USE a phrase, this returns the law that DEFINES it, verbatim. A term defined by several instruments returns several rows — the scope of each definition is the instrument carrying it, so

Parameter	Type	Required	Notes
term	string	yes	The phrase, e.g. 'durable medium'. Matched exactly (case-insensitive).
jurisdiction	string	no	ISO country filter, e.g. 'UK', 'FR', 'EU'.
work	string	no	ELI or official number of the borrowing/defining instrument; scopes the term to that instrument.
limit	number	no	Maximum definitions, default 8.

The act's glossary: every term it defines, alphabetical, with the publisher's own wording verbatim and the provision that defines each one. Use it to orient in an unfamiliar instrument, or to check what a term means IN THIS ACT rather than in the corpus at large — several instruments define 'consumer' differently and all are right within their own scope. AN EMPTY GLOSSARY IS ABOUT OUR READER, NOT

Parameter	Type	Required	Notes
work	string	yes	ELI or official number of the instrument, e.g. '32011L0083'.

How an act words one of its defined terms in each language version held. NOT a translation: an EU instrument is equally authentic in all 24 official languages (Regulation No 1/1958, article 4), so each wording is the law in that language. Use it to answer 'what do the German and French texts call this?' — e.g. 'commercial guarantee of durability' is 'gewerbliche Haltbarkeitsgarantie' and 'garantie

Parameter	Type	Required	Notes
term	string	yes	The phrase, in any language held. Matched exactly (case-insensitive).
work	string	no	Scope to one instrument (ELI or official number).
jurisdiction	string	no	ISO country filter, e.g. 'UK', 'FR', 'EU'.
limit	number	no	Maximum terms, default 8.

Terms of art ranked by how many instruments in this corpus DEFINE them, BORROW them from another act (followed through every intermediate act — an act that takes 'video-sharing platform' from the DSA, which takes it from the AVMSD, counts for the AVMSD's definition) or CITE a defining provision. Nothing in the list was chosen by hand. tier 'pivotal' means at least one act is written around the t

Parameter	Type	Required	Notes
jurisdiction	string	no	Only concepts that reach this jurisdiction, e.g. 'EU', 'GB', 'ES'.
limit	number	no	Maximum concepts: 50, 100 (default), 200 or 500.

One defined term across the whole corpus: each distinct WORDING with the publisher's own text and the instruments that write it, every instrument that borrows it (with the chain of acts it passes through), the instruments that cite a defining provision, and the term's labels in the act's other authentic EU languages. Ask this when a term is defined differently in different instruments ('producer'

Parameter	Type	Required	Notes
term	string	yes	The defined term, e.g. 'producer'. Matched exactly (case-insensitive).

Cross-jurisdiction view of one legal concept: every provision tagged with the given EuroVoc concept, with tagging method and confidence. E.g. 'eurovoc:4585' (VAT), 'eurovoc:4392' (VAT rate). The language-neutral way to line up EU and national law on the same subject.

Parameter	Type	Required	Notes
conceptId	string	yes	Namespaced concept id, e.g. 'eurovoc:4585'.
jurisdiction	string	no	ISO country filter, e.g. 'UK', 'FR', 'EU'.
minConfidence	number	no	Drop tags below this confidence (0-1).

Edges between instruments: which national laws transpose a directive (direction 'in'), or what an instrument implements/amends (direction 'out'). Instrument-level; for article-level links use find_national_implementations.

Parameter	Type	Required	Notes
eli	string	yes	ELI URI of the instrument, e.g. 'http://www.legislation.gov.uk/id/ukpga/1994/23' (UK VAT Act 1994) or 'http://data.europa.eu/eli/dir/2006/112/oj' (EU VAT Directive).
direction	string	no	'in' = edges pointing at this work (default), 'out' = from it.

The act-level overview: every provision of every instrument in this corpus that names the given act, grouped by citing instrument, with the article of the act each citation resolved to (targetEId, null where the citation is act-level — which is most of them, and is not a defect). Each instrument also carries adoptions: definitions it BORROWS from this act rather than writing, which is a differ

Parameter	Type	Required	Notes
eli	string	yes	ELI URI or official number of the instrument — a French code has only the latter.
limit	number	no	Maximum citing provisions, default 500, cap 2000.

Prior and successor versions of one provision across consolidations — how the text got to its current form. Lexiara Nexus data requires an API key on a signed-in account. The free plan carries a monthly Nexus allowance; the legislative text itself is always free.

Parameter	Type	Required	Notes
work	string	yes	ELI URI of the instrument, e.g. 'http://www.legislation.gov.uk/id/ukpga/1994/23' (UK VAT Act 1994) or 'http://data.europa.eu/eli/dir/2006/112/oj' (EU VAT Directive).
eId	string	yes	Provision identifier: 'sec_4' (section 4), 'art_2__para_1' (article 2(1)), 'sch_9' (Schedule 9). Use search or history endpoints to discover eIds.

National provisions implementing one EU provision, with method and confidence per link. DERIVED data, not published by any authority: treat links not marked method='human' as leads to verify, and say so when citing. Check evidenceStatus: a current national consolidated reading aid may be informative rather than authoritative, and older links may be stale. Lexiara Nexus data requires an API key on

Parameter	Type	Required	Notes
work	string	yes	ELI of the EU instrument, e.g. the VAT Directive.
eId	string	yes	Provision identifier: 'sec_4' (section 4), 'art_2__para_1' (article 2(1)), 'sch_9' (Schedule 9). Use search or history endpoints to discover eIds.
jurisdiction	string	no	ISO country filter, e.g. 'UK', 'FR', 'EU'.
minConfidence	number	no	Drop links below this confidence (0-1).

Sections of official GUIDANCE that discuss one provision — Commission notices and guidelines on the act, quoted verbatim with the section number the publisher prints, so an answer can cite '§2.8 of the UCPD Guidance' and be checked. EVERY ROW IS NON-BINDING (binding: false). This is the enforcing body's own reading, not law: only the instrument's text has legal force, and only a court settles

Parameter	Type	Required	Notes
work	string	yes	ELI URI of the instrument, e.g. 'http://www.legislation.gov.uk/id/ukpga/1994/23' (UK VAT Act 1994) or 'http://data.europa.eu/eli/dir/2006/112/oj' (EU VAT Directive).
eId	string	yes	Provision identifier: 'sec_4' (section 4), 'art_2__para_1' (article 2(1)), 'sch_9' (Schedule 9). Use search or history endpoints to discover eIds.
includeActLevel	boolean	no	Also return sections that name the act but no article. Off by default: a notice's introduction cites the whole directive and would otherwise appear under every article of it.

Curated obligation topics ('Pre-contract information') under a subject head, each with a one-paragraph orientation and per-jurisdiction anchor counts. Descriptions with editorialStatus='draft' are UNREVIEWED model drafts — say so if you quote one. Feed a result's conceptId to get_topic.

Parameter	Type	Required	Notes
subject	string	yes	Subject head concept id, e.g. 'local:consumer'.

Everything a topic page shows: the orientation paragraph (with its draft/published editorial status), per-jurisdiction legal-status notes (GB notes carry the assimilated-law caveat), anchored provisions with anchor provenance, article-level transposition links (method, confidence, review verdict — anything not method='human' is evidence, not a finding), and related instruments from Lexiara Nexus.

Parameter	Type	Required	Notes
conceptId	string	yes	Topic concept id, e.g. 'local:topic-pre-contract-information'.

Change feed: provisions added or modified, filterable by jurisdiction, concept and date. detectedAt is when Lexiara observed the change — legal in-force dates come only from the provision itself.

Parameter	Type	Required	Notes
jurisdiction	string	no	ISO country filter, e.g. 'UK', 'FR', 'EU'.
concept	string	no	Restrict to one concept id, e.g. 'eurovoc:4585'.
since	string	no	ISO date: only changes detected after this.
limit	number	no	Maximum items, default 50.

The AUTO-GATED backlog from one place, newest first: unreviewed article-level transposition links with BOTH provision texts side by side and the stored reasoning, model/low-confidence concept tags, draft topic descriptions and jurisdiction notes, and recorded findings (gaps and divergences a round could not decide). Filter by kind, vertical and jurisdiction. EVERYTHING HERE IS UNREVIEWED EVIDENCE

Parameter	Type	Required	Notes
kind	string	no	Comma-separated kinds: transposition, tag, topic-description, jurisdiction-note, finding. Omit for all.
vertical	string	no	Vertical id, e.g. 'eu-consumer', 'fr-consumer', 'es-consumer'.
jurisdiction	string	no	ISO country filter, e.g. 'UK', 'FR', 'EU'.
limit	number	no	Maximum items, default 20, max 100.
offset	number	no	Skip this many items — the queue is paged, not sampled.
chars	number	no	Characters of provision text per side. Omit for the WHOLE text, which is the default: a character budget once hid two parts of a French code article and produced two false absences.
lowConfidence	number	no	Also list non-model classifier tags at or below this confidence. Omit for model tags only — the keyword baseline's weak tail is 24 000 rows and would bury the 157 links a verdict changes.

The instruments, provisions, subjects, jurisdictions and verticals this API key follows. READ-ONLY: creating or removing a follow is an HTTP POST/DELETE to /v1/follows, and no tool here dispatches one. (The one tool in this catalogue that writes anything is request_ingestion, which asks for a law and touches no follow.) Requires the caller's OWN key — the shared demo key is refused, since a follow

No parameter schema on file.

The digest: every change the corpus observed on followed law, each with a SIGNIFICANCE grade and the reasoning behind it — 'major' (a new consolidation whose version point advanced, a provision appearing, a provision now repealed), 'minor' (wording changed, or the stored text moved while the publisher's version point did not), 'housekeeping' (first ingest, bulk churn from a version substitution).

Parameter	Type	Required	Notes
since	string	no	ISO timestamp. Omit to use each follow's own last read.
minSignificance	string	no	Floor for this call: major \| minor \| housekeeping.
limit	number	no	Maximum developments, default 100.

Per-source coverage and freshness. Call this first when unsure whether Lexiara holds the law you need — absence of coverage means 'not here', never 'does not exist'. Pass work to ask about ONE instrument. The answer then says which kind of absence it is: metadata-only (the instrument is known and no text is held), language-not-held, or not-held. Each carries requestable and a `request_h

Parameter	Type	Required	Notes
work	string	no	Optional: ask about ONE instrument by CELEX, ELI or official number. The answer then carries requested.gap — metadata-only, language-not-held or not-held — or requested.held: true when the corpus
language	string	no	Optional ISO 639-3 code, e.g. 'fra', to ask about one language version.

When a lookup returns coverage with requestable: true, ask for the missing instrument instead of stopping or guessing. Give the CELEX (or an EU ELI), the language and the version point; say WHY in one or two sentences; state any testable expectations. Lexiara validates the target, fetches the publisher's own bytes, reads them through the same parser and the same fail-closed checks every other

Parameter	Type	Required	Notes
celex	string	no	CELEX id of the act, e.g. '32024L0825', or a dated consolidation '02005L0029-20220528'.
eli	string	no	An EU ELI on the Publications Office's own domain, if you have no CELEX.
language	string	no	ISO 639-3 language wanted, e.g. 'eng', 'fra'. Default 'eng'.
version	string	no	'as-adopted' (default), the publisher's consolidation date as YYYY-MM-DD, or 'unresolved' when you genuinely do not know — which returns a question, not a job.
role	string	no	'law' (default) or 'guidance' for a Commission notice.
intent	string	yes	What kind of gap this is. derived_references refreshes derived references for a held work; missing_component and repair against an act already held re-read THAT expression rather than creating a sec
rationale	string	no	One or two sentences: the question, and why this evidence is needed. Private to your account.
origin	object	no	Lexiara handles you started from (work, eId, expression id). Private.
evidence_path	array	no	The shortest path from held material to the missing target: each step a { from, relationship, to } you observed. Private, and evidence for a human, never an instruction.
proposed_sources	array	no	Official identifiers or locators you believe serve this act. RECORDED AS TEXT AND NEVER FETCHED.
expectations	array	no	Up to ten predicates, each naming exactly one of has_article, has_annex, mentions, min_provisions, language_is.
idempotency_key	string	no	Your own key for this request. The same key returns the same request.
requested_bounds	object	no	maxBytes / maxSeconds you are willing to spend. May only NARROW the server's budget; a larger number is ignored.

List up to the latest 50 ingestion requests belonging to your account, newest first. Each row includes private status fields such as intent, created_at and origin; another account's requests are never returned. This is read-only and does not start, repeat or alter acquisition work.

No parameter schema on file.

State, stage, reason code and the time to wait before asking again, for one request you made. States: already_available, queued, running, available, partial, needs_clarification, needs_source_approval, failed, confirmed_unavailable. A fetch that timed out is failed and will be retried; confirmed_unavailable is the publisher itself saying it does not hold that manifestation, which is a differen

Parameter	Type	Required	Notes
request_id	string	yes	The request_id request_ingestion returned.

The published handles — expression id, work ELI, the /v1/works/text and /v1/provisions addresses — plus the source manifest (publisher URL, content hash, bytes, retrieval time, parser version) and the expectation results. Repeat your original lookup with the handles. Pass expressionId as the exact expression query parameter to /v1/works/text or /v1/provisions to preserve the acquired expre

Parameter	Type	Required	Notes
request_id	string	yes	The request_id request_ingestion returned.

Free

$0 forever

Every tool — any call limit is its publisher’s, not ours
No card, and mcprush charges nothing for it
Runs at its publisher’s own address — this marketplace is not in the path
Nothing to cap, because mcprush bills nothing

Nothing here is billable: mcprush charges nothing to install Lexiara or to call it, at any volume.

Where are you running it?

Tool surface

Release history

Lexiara MCP

What it does

Quickstart

Where are you running it?

Tool surface

What counts against your monthly calls

Release history

See also