SAP MCP Command Center

Three synthetic SAP systems behind one Model Context Protocol (MCP) gateway, wrapped in a Next.js dashboard and a plain-English "command center" with a live MCP tool-call feed.

Open the web app, type a question like "Which materials are below reorder point in Frankfurt?", and watch it become a real MCP tool call that returns SAP-like data as tables and charts — the same tools are simultaneously connectable from Claude Desktop.

Synthetic data — no real SAP required. All data is generated locally with a fixed seed. Rule-based NL — no LLM, no API key. Plain-English routing is 100% deterministic, so a live demo never hits a rate limit or "the API is down" moment.

Screenshots

• Dashboard — docs/dashboard.png (KPIs, sales trend, inventory by plant, order-status donuts, top customers/materials)

• Command Center — docs/command-center.png (chat on the left, live MCP tool-call feed on the right)

• Systems — docs/systems.png (three auto-registered systems and the tools each exposes)

Related MCP server: SAP OData to MCP Server

The 3-layer story

The same MCP pattern, applied at three layers of the SAP stack:

Each is exposed as MCP tools through one gateway, and every tool returns flat JSON with a top-level status field — echoing a real BEx server's contract.

Architecture

                         Browser (Next.js :3000)
                    plain English │        │ dashboard data
                                  ▼        ▼
   Claude Desktop            ┌─────────────────────────────────┐
        │  MCP SSE           │   Express gateway  (:3041)       │
        └───────────────────▶   /sse        /api/ask           │
                             │   /api/dashboard  /api/activity  │
                             └──────────────┬──────────────────┘
                                            │  the SAME tool handlers
                          ┌─────────────────┼─────────────────┐
                          ▼                 ▼                 ▼
                      sap_erp            sap_s4            sap_bw
                    (master data)    (transactional)    (analytics)
                          └─────────────────┴─────────────────┘
                                            ▼
                                  SQLite (synthetic, seeded)

A plain-English question and an MCP client call land on the same config-driven tool handlers, which read from a local SQLite database seeded with realistic, German-plant SAP data.

Quickstart

git clone <your-repo-url> sap-mcp-command-center
cd sap-mcp-command-center

npm install      # installs server + web workspaces
npm run seed     # build the synthetic SQLite database (stable, fixed seed)
npm run dev      # start the gateway and the web app together

Then open:

• Web app → http://localhost:3000

• Gateway → http://localhost:3041 (/health, /api/systems, MCP SSE at /sse)

Ports are configurable: PORT for the gateway, NEXT_PUBLIC_API_BASE for the web app. (The gateway defaults to 3041 to avoid colliding with other local dev servers on 3000/3001.)

Scripts

Try it in plain English

Type these into the Command Center (or POST /api/ask {"text": "..."}):

• "Which materials are below reorder point in Frankfurt?"

• "Top 5 customers by revenue"

• "Show open purchase orders"

• "Sales trend this year"

• "List FERT materials in Munich"

• "Deliveries for order 4500000123"

• "Ping all systems"

Each one routes deterministically to a tool, dispatches it through the gateway, and lights up the live tool-call feed.

What's interesting technically

• Config-driven MCP tool registration. Tools are generated from server/src/systems.config.json. Adding a fourth system entry registers all of its tools ({system}_{capability}) with zero code changes — great for a live "watch me add a system" demo.

• One set of handlers, two front doors. The exact same tool handlers serve both the MCP SSE transport (real protocol, connectable from Claude Desktop) and the REST bridge the web UI calls. That's what lets this be a real MCP server and a slick web app from one codebase.

• Live tool-call telemetry. Every invocation — whether from MCP or REST — is timed and pushed through a ring buffer + event emitter, then streamed to the UI over Server-Sent Events.

• Deterministic NL routing. A small ordered set of intent rules + entity extractors (plant names → codes, statuses, time phrases, document numbers) maps English to tool calls. No model, no key, fully reproducible.

• Stable demo data. A fixed @faker-js/faker seed means the numbers are identical on every npm run seed, so your screenshots and talk track always match.

Connect Claude Desktop

The gateway exposes a real MCP SSE endpoint at http://localhost:3041/sse, so a technical reviewer can drive the same synthetic systems from Claude Desktop in plain English.

Option A — Connectors UI (recommended): Claude Desktop → Settings → Connectors → Add custom connector, then paste the SSE URL:

http://localhost:3041/sse

Option B — config file (claude_desktop_config.json), bridging SSE via mcp-remote:

{
  "mcpServers": {
    "sap-mcp-command-center": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "http://localhost:3041/sse"]
    }
  }
}

A ready-to-copy version lives in claude_desktop_config.example.json. Make sure the gateway is running (npm run dev), then restart Claude Desktop. You'll see list_systems plus the per-system tools (sap_erp_get_material, sap_bw_run_query, …). Verify the endpoint is reachable any time with:

curl http://localhost:3041/health
curl -N http://localhost:3041/sse   # opens the event stream (Ctrl-C to stop)

Project structure

server/
  src/
    data/        db.js · generate.js (faker seed) · analytics.js (BW-style queries)
    mcp/         tools.js (capability registry) · gateway.js (config-driven registration)
                 transport.js (SSE) · telemetry.js (ring buffer + emitter)
    nl/          router.js (rule-based plain-English → tool call)
    rest.js      REST bridge (/api/*)
    index.js     Express app: MCP SSE + REST
    systems.config.json
  test/          *.smoke.js — one per backend stage
web/
  app/           dashboard · command-center · systems (App Router)
  components/     charts, panels, the live ActivityFeed, shape-aware ResultView
  lib/           typed API client + formatting

Notes on choices

• Rule-based NL keeps the demo key-free and 100% reliable — no rate limits in front of a reviewer.

• Shared tool handlers across MCP SSE and the REST bridge are what make "this is a real MCP server" and "here's a polished web UI" both true at once.

• SQLite + fixed seed means stable numbers every run.

Synthetic data only. This project never connects to a real SAP system and uses no LLM API key.