MCP SAP Docs (Upstream)

An MCP server that gives AI assistants (Claude, Cursor, ChatGPT, etc.) access to SAP documentation through a unified search and fetch interface. It combines a local full-text + semantic index over git-cloned SAP docs with optional live queries to SAP Help, SAP Community, and Software Heroes — all exposed as MCP tools.

Public Hosted Endpoint

Ready to use — no setup required

Variant	URL
SAP Docs	http://mcp-sap-docs.marianzeis.de/mcp
ABAP	https://mcp-abap.marianzeis.de/mcp

Variants

mcp-sap-docs is the upstream repository for two MCP server variants that share one codebase and differ by configuration (MCP_VARIANT / .mcp-variant):

Documentation Sources

Offline sources (local index, always available)

Online sources (live queries, enabled by default)

Available Tools

Shared tools (both variants)

sap-docs variant only

abap variant only

Architecture Overview

• Upstream source of truth: mcp-sap-docs
• One-way sync target: abap-mcp-server
• Search uses Hybrid BM25 + Semantic (embedding) fusion via Reciprocal Rank Fusion (RRF)
• Embeddings model: Xenova/all-MiniLM-L6-v2 (~90 MB, cached in dist/models/)

Variant Selection

Resolution order:

1. MCP_VARIANT environment variable
2. .mcp-variant file in repo root
3. fallback: sap-docs

Examples:

# Run as full sap-docs profile
MCP_VARIANT=sap-docs npm run setup
MCP_VARIANT=sap-docs npm run build
MCP_VARIANT=sap-docs npm run start:streamable

# Run as ABAP profile
MCP_VARIANT=abap npm run setup
MCP_VARIANT=abap npm run build
MCP_VARIANT=abap npm run start:streamable

Search Behavior

search performs fused retrieval over:

• Offline FTS index (local submodule content)
• Optional online sources (includeOnline=true):
  • SAP Help
  • SAP Community
  • Software Heroes content search (EN/DE merge + dedupe)

Ranking and filtering highlights:

• Hybrid BM25 + Semantic (embedding) search — keyword and meaning, fused via RRF
• Reciprocal Rank Fusion (RRF) across offline and online sources
• Source-level boosts from metadata
• includeSamples can remove sample-heavy sources
• abapFlavor (standard / cloud / auto) filters official ABAP docs libraries while keeping non-ABAP sources
• sources can restrict offline libraries explicitly

Hybrid Search

The offline search combines BM25 (FTS5 keyword matching) with semantic similarity (dense embeddings via Xenova/all-MiniLM-L6-v2). This allows natural-language and paraphrase queries to find relevant docs even when the exact keywords are missing.

Example: "how to check if a user has permission" finds AUTHORITY-CHECK docs.

Embeddings are pre-computed at build time and stored in docs.sqlite. The model (~90 MB) is cached in dist/models/ (gitignored, in-project).

See docs/HYBRID-SEARCH.md for full details, size impact, and tuning.

Offline-Only Mode

search includes online sources by default. To run offline-only, use:

• local index/submodules only (npm run setup + npm run build)
• includeOnline=false in each search request

Example search request body:

{
  "query": "RAP draft",
  "k": 8,
  "includeOnline": false
}

Docker (offline-only)

Run the container with host binding and call search with includeOnline=false:

docker run --rm -p 3122:3122 \
  -e MCP_VARIANT=sap-docs \
  -e MCP_PORT=3122 \
  -e MCP_HOST=0.0.0.0 \
  mcp-sap-docs

For strict air-gapped execution, disable container networking:

docker run --rm --network none -p 3122:3122 \
  -e MCP_VARIANT=sap-docs \
  -e MCP_PORT=3122 \
  -e MCP_HOST=0.0.0.0 \
  mcp-sap-docs

Notes:

• With --network none, online fetches are impossible by runtime isolation.
• Startup may log warnings for online prefetch attempts (for example ABAP feature matrix); this does not prevent offline search usage.

Quick Start (Local)

npm ci
npm run setup
npm run build

Start server modes:

# MCP stdio
npm start

# HTTP status/dev server
npm run start:http

# MCP streamable HTTP
npm run start:streamable

Default ports by variant:

• sap-docs: HTTP 3001, streamable 3122
• abap: HTTP 3002, streamable 3124

Health checks:

curl -sS http://127.0.0.1:3122/health | jq .
curl -sS http://127.0.0.1:3001/status | jq .

Use variant-specific ports when running abap profile.

Build and Setup Scripts

Script names remain shared (setup, build, start, start:streamable). Behavior changes by variant config:

• setup.sh only initializes variant-allowed submodules
• build-index only includes variant-allowed libraries
• build-fts only indexes variant-allowed libraries

This keeps abap faster and smaller without maintaining a separate build script set.

Docker

Build image for a variant:

# sap-docs image
docker build --build-arg MCP_VARIANT=sap-docs -t mcp-sap-docs .

# abap image
docker build --build-arg MCP_VARIANT=abap -t abap-mcp-server .

Run streamable server:

# sap-docs
docker run --rm -p 3122:3122 \
  -e MCP_VARIANT=sap-docs \
  -e MCP_PORT=3122 \
  mcp-sap-docs

# abap
docker run --rm -p 3124:3124 \
  -e MCP_VARIANT=abap \
  -e MCP_PORT=3124 \
  abap-mcp-server

One-Way Sync to abap-mcp-server

This repository contains direct sync automation:

• Workflow: .github/workflows/sync-to-abap-main.yml
• Script: scripts/sync-to-abap.sh

Flow:

1. Push to mcp-sap-docs/main
2. Workflow clones abap-mcp-server
3. Tracked upstream files are synced (with exclude rules)
4. ABAP overlay is applied
5. .mcp-variant is forced to abap
6. ABAP package identity is patched
7. Commit is pushed to abap-mcp-server/main

Required secret in mcp-sap-docs repo:

• ABAP_REPO_SYNC_TOKEN

Commit message controls:

• [skip-sync] skips sync workflow

Deployment Model

• mcp-sap-docs: upstream implementation + sync trigger
• abap-mcp-server: deployment trigger remains push-to-main in that repository

This preserves ABAP deployment automation while keeping one shared upstream codebase.

PM2 Runtime

ecosystem.config.cjs is variant-aware and resolves:

• process names
• ports
• deploy path

from config/variants/*.json.

Validation Commands

npm run build:tsc
npm run test:url-generation
npm run test:integration
npm run test:software-heroes
npm run test:sap-objects       # SAP Released Objects unit tests

# Variant-specific build checks
MCP_VARIANT=sap-docs npm run build:index
MCP_VARIANT=abap npm run build:index
MCP_VARIANT=sap-docs npm run build:fts
MCP_VARIANT=abap npm run build:fts

Additional Docs

• docs/ARCHITECTURE.md
• docs/DEV.md
• docs/TESTS.md
• docs/UPSTREAM-ONE-WAY-SYNC-IMPLEMENTATION.md
• REMOTE_SETUP.md