@marianfoo/adt-ls

Generic, reusable TypeScript SDK over SAP's headless adt-ls — the adt-lsc language server shipped inside the official sapse.adt-vscode extension. It hides the painful setup (discovery, JVM, named-pipe + LSP handshake, reentrance logon, TLS/truststore, session resilience) so that driving adt-ls is a few lines of code.

Status: published on npm — functionally complete & live-proven. The full SAP authoring lifecycle (search → create → update → read → activate → run-tests → delete), plus code intelligence, quality gates, ABAP formatting, transport, and OData service info, all run end-to-end through createAdtLs() against a real S/4HANA system (adt-ls 1.0.0.202605281240). Runs under Node ≥ 20 and Bun (both verified live).

Install

npm install @marianfoo/adt-ls

You bring adt-ls (SAP Developer License — not redistributable): install the sapse.adt-vscode extension (VS Code / Cursor) and the library auto-discovers it, or vendor the per-platform VSIX for CI. New here → docs/setup.md: which platform build to download, CI vendoring, and connecting with auth.

Quickstart

import { createAdtLs, basic } from '@marianfoo/adt-ls';

const adt = await createAdtLs({
  connection: { systemUrl: 'https://my-s4:50001', selfSigned: true, client: '001' },
  auth: basic('MARIAN', process.env.SAP_PW!), // or bearer(token) / interactive({ openUrl })
});

const hits = await adt.repository.search('CL_ABAP*', { types: ['CLAS/OC'] });
const src = await adt.source.read({ name: 'ZCL_FOO', objectType: 'CLAS/OC' });

await adt.lifecycle.create({ objectType: 'CLAS/OC', name: 'ZCL_BAR', packageName: '$TMP', description: 'demo' });
await adt.lifecycle.activate({ name: 'ZCL_BAR', objectType: 'CLAS/OC' });

await adt.dispose();

Low-level building blocks

Consumers that drive adt-ls themselves — e.g. proxying its MCP endpoint to external agents — can skip createAdtLs() and use the primitives directly (this is what abapify/openadt adopts):

import { resolveAdtLsPath, AdtLsDriver, startMcpServer } from '@marianfoo/adt-ls';

const driver = new AdtLsDriver(resolveAdtLsPath(), {
  extraArgs: ['-consoleLog', `-Djco.middleware.snc_lib=${sncLib}`], // SNC/JCo JVM flags
});
await driver.start(); // discovery + spawn + LSP initialize (short pipe; macOS-safe)
// register your own logon handlers: driver.setRequestHandler('adtLs/destinations/requestBrowserBasedLogon', …)
const { port, token } = await startMcpServer(driver, { port: 2240, token: myToken });
// → proxy http://localhost:${port}/mcp (Authorization: Bearer ${token}) however you like
await driver.dispose();

Capabilities

One namespaced client over both adt-ls channels (LSP + its own MCP) — the split is hidden:

• repository — object search, file read/write/delete, inactive-object list, name→URI resolver.
• source / lifecycle — read; create, update, activate (native — per-phase diagnostics, forceActivation), run unit tests, delete; RAP generators; creatable-type catalog + creation-form (legal values per field) + validation.
• navigation — document symbols, definition/declaration, references, type hierarchy, hover, completion (with resolve → method signatures + ABAP-Doc), syntax check, semantic tokens, and ABAP Pretty-Printer formatting.
• quality — ATC static analysis + ABAP Unit code coverage.
• services — run a console app, service-binding details/publish, and live OData service info (URL + entity sets).
• transport — find / create / assign / list, lock status, and the transport decision oracle (check).
• raw — escape hatches to any adt-ls MCP tool or LSP method.

What maps to which adt-ls call: the capability matrix. What's reachable headless vs. not (with live evidence): the capability survey.

Documentation

• Setup guide — start here: where to get the binary, which platform build, CI vendoring, and connecting with auth.
• 📖 API reference (hosted) — the full TypeDoc site, auto-published to GitHub Pages on every push to main.
• Usage guide — connecting, auth, the full API with examples, resilience, logging.
• Use cases — dev-tool & CI/CD recipes (ABAP Unit gate, ATC, syntax check, MCP server, scaffolding) with the API to use.
• API reference (Markdown) — the same reference rendered in-repo (npm run docs:api).
• Capability matrix — the method surface + the object-type support boundary.
• adt-ls capability survey — what the live binary offers vs. what's wrapped, and the known coverage gaps.
• ADRs — the architecture decisions (0001–0013).

Why this exists

Two first-party projects already drive headless adt-ls and reimplement the same fragile, reverse-engineered plumbing: abapify/openadt (its @openadt/sap-adt-mcp-launcher) and arc-1-lsp (src/adt-ls/*). Both encode the identical landmines (the userAgentInfos NPE, HTTPS-only + hostname verification, silent session death, the reentrance-ticket dance). The fragmentation that actually hurt here is first-party duplication, and the cure is one shared library.

The thesis: adt-ls is the correct path (SAP-maintained CSRF/locking/activation/XML), but its setup is so much harder than calling ADT REST directly that people avoid it. This library makes adt-ls as easy to use as a plain API, so the easy choice is also the right one.

Scope — the hard line

adt-ls ONLY. No direct ADT/SAP HTTP, no SAP ADT SDK sidecar, no MCP server, no Cloud-Connector/BTP bridge inside the library. What adt-ls can't do headless is out of scope. See ADR-0001.

Verified feasibility (2026-06-07, macOS arm64, adt-ls 1.0.0.202605281240)

Proven hands-on against the freshly-downloaded 1.0.0 VSIX and the live a4h system:

• Per-platform binary paths confirmed across all four VSIX (darwin-arm64, darwin-x64, linux-x64, win32-x64).
• Spawn + LSP initialize (with the userAgentInfos workaround) → ADTLS 1.0.0.202605281240.
• Truststore build with the bundled SAP Machine JRE 21 keytool.
• Full create → update → read → activate → run-tests → delete GREEN against a4h — exercising auth (reentrance + TLS proxy), the LSP channel, the MCP channel, and the resilience layer end-to-end.

→ No design or protocol blockers remain.

Consumers

• arc-1-lsp — replaces its src/adt-ls/* entirely; keeps its own MCP server, BTP/Cloud-Connector bridge (via the connection.forwardProxy hook), authz, and write-safety as thin wrappers over the lib.
• openADT — its TypeScript launcher core can converge onto this lib.