ARC-1 — SAP ADT MCP Server

ARC-1 (pronounced arc one [ɑːrk wʌn]) — Enterprise-ready MCP server for SAP ABAP systems. Secure by default, deployable to BTP or on-premise, and hardened with large unit/integration/E2E test coverage.

ARC-1 connects AI assistants (Claude, GitHub Copilot, Copilot Studio, and any MCP client) to SAP systems via the ADT REST API. It ships as an npm package and Docker image.

Full Documentation | Setup Guide | Tool Reference

Why ARC-1?

Built for organizations that need AI-assisted SAP development with guardrails. Inspired by the pioneering work of abap-adt-api, mcp-abap-adt, and vibing-steampunk — ARC-1 adds what's needed to run in production:

Security & Admin Controls

• Safe by default — read-only, no free SQL, no table preview, no transports out of the box. Use --profile developer or explicit flags to enable capabilities

• Operation allowlists/denylists — control exactly which operation types (read, write, search, query, activate, transport) are permitted

• Package restrictions — limit AI write operations (create, update, delete) to specific packages with wildcards (--allowed-packages "Z*,$TMP"). Read operations are not restricted by package — use SAP's native authorization for read-level access control

• Data access control — enable table data preview (--block-data=false) or free-form SQL (--block-free-sql=false)

• Transport safety — require transport assignments, restrict to specific transports, or make transports read-only. Update/delete operations auto-use the lock correction number when no explicit transport is provided

• Safety profiles — preconfigured roles: viewer, viewer-data, viewer-sql, developer, developer-data, developer-sql

• Writes restricted to $TMP when enabled — only local/throwaway objects; writing to transportable packages requires explicit --allowed-packages

Authentication

• API key — simple Bearer token for internal deployments

• OIDC / JWT — Entra ID, Keycloak, or any OpenID Connect provider

• OAuth 2.0 — browser-based login for BTP ABAP Environment

• XSUAA — SAP BTP native auth with automatic token proxy for MCP clients

• Principal Propagation — per-user identity forwarded through Cloud Connector (every SAP action runs as the actual user, not a technical account)

BTP Cloud Foundry Deployment

Deploy ARC-1 as a Cloud Foundry app on SAP BTP with full platform integration:

• Destination Service — connect to SAP systems via managed destinations

• Cloud Connector — reach on-premise systems through the connectivity proxy

• Principal Propagation — user identity forwarded end-to-end via X.509 certificates

• XSUAA OAuth proxy — MCP clients authenticate via standard OAuth, ARC-1 handles the BTP token exchange

• Audit logging — structured events to stderr, file, or BTP Audit Log Service

Token Efficiency

• 11 intent-based tools (~5K schema tokens) instead of 200+ individual tools — keeps the LLM's context window small

• Method-level read/edit — read or update a single class method, not the whole source (up to 20x fewer tokens)

• Context compression — SAPContext returns public API contracts of all dependencies in one call (7-30x compression)

Built-in Object Caching

• Automatic source caching — every SAP object read is cached in memory (stdio) or SQLite (http-streamable). Repeated reads return instantly without calling SAP.

• Dependency graph caching — SAPContext dep resolution keyed by source hash; unchanged objects skip all ADT calls on subsequent runs.

• Pre-warmer — start with ARC1_CACHE_WARMUP=true to pre-index all custom objects at startup, enabling reverse dependency lookup (SAPContext(action="usages")).

• Write invalidation — when SAPWrite modifies an object, its cache entry is automatically dropped; next read fetches fresh source.

See docs/caching.md for full documentation.

Testing

• 1,367+ unit tests (53 unit test files, mocked HTTP)

• ~160 integration tests against live SAP systems, with explicit skip reasons when credentials or fixtures are missing

• ~70 E2E tests that execute real MCP tool calls against a running ARC-1 server and live SAP system

• CRUD lifecycle and BTP smoke lanes included (test:integration:crud, test:integration:btp:smoke)

• CI matrix on Node 22 and 24; integration + E2E run on push to main and internal PRs

• Reliability telemetry + coverage published as informational CI signals (non-blocking)

Tools Refined for Real-World Usage

The 11 tools are designed from real LLM interaction feedback:

Tool definitions automatically adapt to the target system (BTP vs on-premise), removing unavailable types and adjusting descriptions so the LLM never attempts unsupported operations.

Feature Detection

ARC-1 probes the SAP system at startup and adapts its behavior:

• Detects HANA, abapGit, RAP/CDS, AMDP, UI5, and transport availability

• Auto-detects BTP vs on-premise systems

• Maps SAP_BASIS release to the correct ABAP language version

• Each feature can be forced on/off or left on auto-detect

Quick Start

npx arc-1@latest --url https://your-sap-host:44300 --user YOUR_USER

For Docker, BTP deployment, client configuration (Claude Desktop, Claude Code, VS Code, Copilot Studio), and all authentication methods, see the Setup Guide.

Documentation

Full documentation is available at marianfoo.github.io/arc-1.

Development

npm ci && npm run build && npm test

See CLAUDE.md for codebase structure, testing commands, and contribution guidelines.

Credits

License

MIT