English Français العربية

BGB (Germany)

Official registry Developer tools

German Civil Code (BGB) as executable rules: periods, deadlines and more, answered with grounds

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http bgb-germany 'https://mcp.arxo.io/mcp/de-bgb'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "bgb-germany": {
            "type": "http",
            "url": "https://mcp.arxo.io/mcp/de-bgb"
        }
    }
}
NPM package @arxo/mcp-de-bgb
Claude Code 
claude mcp add bgb-germany -- npx -y @arxo/mcp-de-bgb@0.1.9
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "bgb-germany": {
            "command": "npx",
            "args": [
                "-y",
                "@arxo/mcp-de-bgb@0.1.9"
            ]
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. arxo-bgb.git
  2. Contents
  3. How it is verified
  4. Dependencies
  5. Asking these packages
  6. Worked cases
  7. Rights

arxo-bgb.git

Pinned canon, executable as it stands: source text with provenance, the model built over it and the scenarios that check its answers. The norms here are data — they are executed by law; this repository carries no rule code of its own.

Contents

PackageVersionScenariosDependencies
calc.kinship0.1.0390
de.bgb.core0.1.010
doctrine.ius_privatum0.1.0370
de.bgb.fristen0.1.0861
de.bgb_18960.1.051
de.bgb.allgemeiner_teil0.1.0213
de.bgb.besitz_eigentum0.1.01432
de.bgb.betreuung0.1.01102
de.bgb.dienst_werk0.1.02102
de.bgb.ehe0.1.0573
de.bgb.ius_privatum0.1.013
de.bgb.miete0.1.0312
de.bgb.sonstige_vertraege0.1.04982
de.bgb.uebergang0.1.0152
de.bgb.dingliche_rechte0.1.01233
de.bgb.erbfolge0.1.0404
de.bgb.schuldrecht_at0.1.0514
de.bgb.verwandtschaft0.1.0824
de.bgb.bereicherung_delikt0.1.0715
de.bgb.kauf0.1.0905
de.bgb.verfuegungen0.1.0825

How it is verified

Every package is built by package.py with the pinned toolchain: compilation, §267 scenarios on both evaluators, replay of saved evaluations and a rebuild from the release itself. A failure of any step stops the build.

python3 tools/toolchain.py download --lock toolchain.lock.json --out /tmp/law-tools
python3 /tmp/law-tools/package.py packages/<name> \
    --lawc /tmp/law-tools/law-cli --offline --out /tmp/<name>-release

Dependencies

Dependency bytes are pinned under packages/<name>/deps/ and verified against the contentHash recorded in law.lock: the build and the CI are offline.

Asking these packages

Two ways, the same slice of the canon and the same engine; the difference is whose machine evaluates.

  • Hosted: https://mcp.arxo.io/mcp/de-bgb — requests are evaluated on Arxo infrastructure.
  • Local: docker compose -f mcp/compose.yml up — nothing leaves the machine.

mcp/pin.json records what either one must answer from: the content hash of the canon profile, the pinned packages, the ABI version of the engine and the availability of the hosted endpoint. An answer that cannot be traced to that pin is not this repository's answer.

Worked cases

Each collection is a case package of its own: the facts, the questions and the answers, with the pinned canon as its dependency. Ask one from its directory with law ask . — nothing is downloaded.

CollectionCasesQuestions
packages/de.bgb.fristen/examples/ein-fall-drei-kodizes64
packages/de.bgb.fristen/examples/fristenrechner816
packages/de.bgb_1896/examples/ein-fall-zwei-jahrhunderte56
packages/de.bgb.miete/examples/kuendigung-und-mieterhoehung614
packages/de.bgb.uebergang/examples/vor-und-nach-200249
packages/de.bgb.erbfolge/examples/erbfolge-und-pflichtteil818
packages/de.bgb.schuldrecht_at/examples/rechtsbehelfe66
packages/de.bgb.schuldrecht_at/examples/verzugszinsen59
packages/de.bgb.schuldrecht_at/examples/widerruf612

Rights

Code and model: see LICENSE. The pinned texts of the publishers keep their own terms of reproduction, listed per package in NOTICE; those terms are not covered by the code licence.

Maintainer: Rifat Dzhumagulov (hi@arxo.io). Address: git@github.com:arxohq/arxo-bgb.git.

Frequently asked questions

What is BGB (Germany)?

German Civil Code (BGB) as executable rules: periods, deadlines and more, answered with grounds

How do I install BGB (Germany)?

It runs as a remote server. In Claude Code: claude mcp add --transport http bgb-germany 'https://mcp.arxo.io/mcp/de-bgb'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does BGB (Germany) need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is BGB (Germany) open source?

Yes. Its code is on GitHub under the Apache-2.0 license.

Who maintains BGB (Germany)?

It is published by arxohq. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.