BGB (Germany)
German Civil Code (BGB) as executable rules: periods, deadlines and more, answered with grounds
Connect it
Settings → Connectors → Add custom connector
URL: https://mcp.arxo.io/mcp/de-bgbSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://mcp.arxo.io/mcp/de-bgb{
"mcpServers": {
"de-bgb": {
"url": "https://mcp.arxo.io/mcp/de-bgb"
}
}
}claude mcp add --transport http de-bgb https://mcp.arxo.io/mcp/de-bgb{
"servers": {
"de-bgb": {
"type": "http",
"url": "https://mcp.arxo.io/mcp/de-bgb"
}
}
}{
"mcpServers": {
"de-bgb": {
"command": "npx",
"args": [
"-y",
"@arxo/mcp-de-bgb@0.1.9"
]
}
}
}claude mcp add de-bgb -- npx -y @arxo/mcp-de-bgb@0.1.920 tools, verified live
law_searchread-onlyA semantic SEARCH over formalised law: a question or a notion in your own words → candidates with addresses — predicates with signatures, rules, article fragments. This is the layer of DISCOVERY, not of the answer: the result says WHAT to ask next (law_ask by signature, law_rules, law_sources) and establishes neither a fact nor a norm. The ranking is a deterministic lexical embedder (DECISION-0040
law_passportread-onlyPassport of an exact release: purpose, interface, boundaries, checks and performance. The reports section holds the history of measurements, failures included. Entries are paged by JSON Pointer; next continues the answer.
law_answer_capabilitiesread-onlyA machine-readable matrix of the Lens producers that are actually installed, of replay/projection checks, profiles, limits and the contract tests that confirm them. declared_only means a schema with no executable witness.
law_capture_answerread-onlyRun a registered producer and obtain producerControl/0.2 for a later verifiable preparation of a Lens. The producer is chosen only from the shipped registry.
law_prepare_answerAt the explicit request of the user, repeat between 1 and 12 earlier law_ask or law_process_run calls (the course of a case, DECISION-0160), compare their replayControl strictly, and prepare a non-public frozen document for 24 hours. The client never supplies the machine answer: the server obtains it only by executing afresh. A divergence in any input, in the law, in a resource, in the server code
law_publish_answerPublish a prepared document. Repeating it with the same preparationId idempotently returns the same URL and the same separate revocation secret.
law_revoke_answercan modifyRevoke a published document using its separate secret. The public id alone grants no control; revocation closes the HTML page, the API and the download.
law_packagesread-onlyThe catalogue of formalised law: instruments, predicates with signatures, the boundaries of coverage. This is where the NAMES of predicates come from — they must never be guessed. But do NOT start from the catalogue when looking for the right instrument: the overview is large, and the title of an instrument rarely matches the words of a question ("Newton's laws of motion" contains no word "physics
law_askread-onlyPut a question to formalised law. When the answer is "not established" it carries whyNot — the engine's why_not report §185: the candidate rules and the state of every conjunct (satisfied / not satisfied / undetermined); the missing facts are visible there and need not be guessed. BEFORE THE FIRST call obtain the predicate names through law_search (a question in your own words → addresses) or law_
law_screenread-onlyBuild a necessary condition — a superset — for the preliminary selection of rows from an external source (DECISION-0120). This is NOT a legal answer and NOT SQL: the result is a typed tree and a manifest of the extensions up to TRUE. Every row that passes must then be computed in full by the engine, with a proof graph, on the same snapshot of the data. The binding is passed as a pinnable object; s
law_rulesread-onlyThe rules of formalised law put into words: exactly how a predicate is derived (premises, source articles). Call this BEFORE supplying facts to law_ask — the rules say which facts are needed instead of leaving them to be guessed. For large instruments package=… returns a table of contents; the full text comes from predicate=…. The listing by package is paged: limit (20 by default, 500 at most) and
law_explainread-onlyUnfold the proof of a law_ask answer into a chain "rule ← premises → conclusion". The compact input: question (the original law_ask arguments, truth/collect), resultHash and codeHash from the provenance of the answer. The server repeats the computation and compares the hashes; if anything changed it refuses explicitly. Alternatively pass the evaluation from law_ask(proof=true). answerResource=full
law_case_askread-onlyDie Operation ask §168.4 (DECISION-0165, DECISION-0399): eine registrierte Sache eines Fallpakets über ihren verankerten Abhängigkeiten ausführen und das kanonische Auswertungsdokument mit Beweis und Manifest zurückgeben. Die Frage ist JSON nach query.schema.json (query), eine evaluate-Zeichenkette (evaluate + queryId), eine gespeicherte queryId ohne query oder card + args. Eine Verweigerung der V
law_sourcesread-onlySources: by default short excerpts (view=summary), 5 texts per page, with the address of the full text in fragments[].full. Either package or fragment is required (a StableId from law_search/law_rules). view=full returns exact parts of the text: textRange sets a range of Unicode characters, fragments[].next is the continuation with a contentHash. The hash refers to the WHOLE source, not to the exc
law_argueread-onlyHow robust a conclusion is: the map of the dispute under the argumentation profile §274 (DECISION-0039). The answer falls into four classes: SKEPTICALLY_ACCEPTED — the conclusion is invulnerable (it survives in the grounded extension); CREDULOUSLY_ACCEPTED — merely defensible (there is a position for it and a position against); REJECTED — it survives nowhere; NO_ARGUMENT — there are no arguments a
law_processread-onlyWhich stages the procedure established by an instrument consists of, and whether it carries a structural defect (O-5, DECISION-0052). The stages, the transitions and the condition of every transition are reconstructed from the formalisation rather than retold: what leads from where to where, and under what condition. The check of the graph: unreachable stages, dead transitions, a transition that e
law_process_runread-onlyHow a particular case will run, step by step (O-5, DECISION-0052): a log of {date, attempt?, facts?} is executed frame by frame, and the law of each frame is the law of ITS date. The answer says: which stages have been entered; which attempted transition produced NO legal effect (§164 — "the act was performed but did not take place"); which duties are violated and which time limits are running; wh
law_editionsread-onlyThe axis of editions (O-2): what changed in an instrument between two dates of the law — the state of the editions, the dating of the norms and the semantic diff §215 between the D1 projections. The verdict NOT_DATED means "there was nothing to date it by", not "nothing changed". The outcome of a particular question on a date comes from law_ask with legalTime.
law_queryread-onlyEine deterministische LawQL-Abfrage über das CLIR einer Formalisierung: eine Frage an das Modell des Aktes selbst, nicht an einen Fall. Relationen: nodes(id,kind,package,package_name,path), edges(from,to,role), anchors(node,anchor,act,locator,path), labels(node,lang,text,status), fields(node,field,value,value_kind), rules(id,strength,head_predicate,head_polarity,head_variables,body_variables,body_
law_reportread-onlyA REPORT of a divergence between the formalisation and the source: the answer contradicts the pinned text, a norm of the source is not expressed by a rule, a §218 label diverges from the text, an address cannot be found. A report is a hypothesis for triage by a formaliser: it does NOT change the law, it never reaches the answers of the other tools, and "not derived" does not become "derived" becau
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