ARC-1

Name: ARC-1
Author: arc-mcp

Reads, edits, checks and activates ABAP code on SAP systems through the ADT REST API

By arc-mcp TypeScript Local · stdio Developer tools

GitHub npm Website

56 popularity score ★ 253 ↓ 2.7k/wk

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Local (npm)

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Opens the app, which asks before it adds the server. Then replace each <NAME> in its settings with your value.

Or add it by command or config

It needs SAP_URL, SAP_USER, SAP_PASSWORD. Replace each <NAME> with your value.

Claude CodeTerminal

claude mcp add arc-1 -e SAP_URL=<SAP_URL> -e SAP_USER=<SAP_USER> -e SAP_PASSWORD=<SAP_PASSWORD> -- npx -y arc-1@latest

Claude Desktopclaude_desktop_config.json

{
  "mcpServers": {
    "arc-1": {
      "command": "npx",
      "args": [
        "-y",
        "arc-1@latest"
      ],
      "env": {
        "SAP_URL": "<SAP_URL>",
        "SAP_USER": "<SAP_USER>",
        "SAP_PASSWORD": "<SAP_PASSWORD>"
      }
    }
  }
}

Cursor~/.cursor/mcp.json

{
  "mcpServers": {
    "arc-1": {
      "command": "npx",
      "args": [
        "-y",
        "arc-1@latest"
      ],
      "env": {
        "SAP_URL": "<SAP_URL>",
        "SAP_USER": "<SAP_USER>",
        "SAP_PASSWORD": "<SAP_PASSWORD>"
      }
    }
  }
}

VS Code.vscode/mcp.json

{
  "servers": {
    "arc-1": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "arc-1@latest"
      ],
      "env": {
        "SAP_URL": "<SAP_URL>",
        "SAP_USER": "<SAP_USER>",
        "SAP_PASSWORD": "<SAP_PASSWORD>"
      }
    }
  }
}

Codex~/.codex/config.toml

[mcp_servers.arc-1]
command = "npx"
args = ["-y", "arc-1@latest"]

[mcp_servers.arc-1.env]
SAP_URL = "<SAP_URL>"
SAP_USER = "<SAP_USER>"
SAP_PASSWORD = "<SAP_PASSWORD>"

Gemini CLITerminal

gemini mcp add --scope user -e SAP_URL=<SAP_URL> -e SAP_USER=<SAP_USER> -e SAP_PASSWORD=<SAP_PASSWORD> arc-1 npx -- -y arc-1@latest

Settings 12

Set together: connection
`SAP_URL`	Required: Base URL of the SAP system's ADT endpoint, with scheme and port, e.g. https://host:44300.
`SAP_USER`	Required: SAP user name for basic authentication (cookie, BTP service-key or destination auth are alternatives).
`SAP_PASSWORD` secret	Required: Password for SAP_USER.
`SAP_CLIENT`	Optional: SAP logon client. Default `100`.
`SAP_LANGUAGE`	Optional: Logon language. Default `EN`.
Set together: writes
`SAP_ALLOW_WRITES`	Optional: Master switch for creating, changing, activating and deleting objects. Default `false`. For SAPWrite, SAPActivate.
`SAP_ALLOWED_PACKAGES`	Optional: Comma-separated packages writes may touch, with wildcards; * allows all. Default `$TMP`.
`SAP_ALLOW_TRANSPORT_WRITES`	Optional: Allows creating and releasing transports; also needs SAP_ALLOW_WRITES. Default `false`. For SAPTransport.
`SAP_ALLOW_GIT_WRITES`	Optional: Allows abapGit/gCTS changes; also needs SAP_ALLOW_WRITES. Default `false`. For SAPGit.
Set together: data access
`SAP_ALLOW_DATA_PREVIEW`	Optional: Enables table contents in SAPRead and saved SAPscript texts and SLG1 logs in SAPQuery. Default `false`. For SAPRead, SAPQuery.
`SAP_ALLOW_FREE_SQL`	Optional: Enables the sql action of SAPQuery for ad-hoc ABAP SQL. Default `false`. For SAPQuery.
`ARC1_TOOL_MODE`	Optional: standard (12 tools) or hyperfocused (one tool for small context windows). Default `standard`.

What it does

ARC-1 is an MCP server for ABAP development on SAP systems. It talks to the system's ABAP Development Tools (ADT) REST endpoint, the same interface Eclipse ADT uses, so an assistant can read source and DDIC objects, search the repository, follow definitions and where-used lists, run syntax checks, ABAP Unit and ATC, lint code, and, once allowed, create, change and activate objects, handle CTS transports and run abapGit or gCTS operations. It works with on-premise systems and with SAP BTP ABAP Environment, probes the system at startup and drops object types the target does not support.

Instead of hundreds of narrow tools it groups the work into 12 tools that take an action or type argument. A hyperfocused mode (ARC1_TOOL_MODE=hyperfocused) folds everything into one tool for clients with little context room. Most of it stays off until an operator flips the SAP_ALLOW_* switches. In version 1.9.0 the registry (src/handlers/tools.ts and query-tool.ts) leaves SAPWrite and SAPActivate out unless SAP_ALLOW_WRITES is true, and shows SAPGit only when a gCTS or abapGit backend is detected. SAPQuery appears once either SAP_ALLOW_FREE_SQL or SAP_ALLOW_DATA_PREVIEW is on. Free SQL gives it the sql action. Data preview adds reading saved SAPscript long texts and SLG1 application logs, but the code offers those two actions on on-premise systems only, and drops the log action whenever SAP_BLOCKED_DATA_SOURCES is set. A default install therefore sees a read-only subset of the 12.

It runs locally over stdio for one developer, or as a long-lived HTTP server (Docker image or BTP Cloud Foundry app) for a team, with API-key, OIDC or XSUAA sign-in in front and optional per-user SAP identity through principal propagation. On BTP an experimental multi-target mode serves several SAP systems from one deployment, and writes there are limited to pinned principal-propagation targets that each need their own destination and IAM opt-in.

What it needs

Runtime	Node.js 22.19+
Runs on	macOS, Windows, Linux
SAP ABAP system (on-premise or BTP ABAP Environment)	Enterprise planAn SAP user with ADT authorizations on a system whose ADT endpoint you can reach; a development or sandbox system is advised

The npx command needs Node.js 22.19 or newer (engines in package.json). The SAP system's ADT HTTP(S) endpoint must be reachable from where it runs. Where only RFC or SAProuter reaches the system, a separate ADT-to-RFC bridge is needed. The Docker image starts an HTTP server on port 8080 rather than stdio and refuses to start without API-key, OIDC or XSUAA auth unless ARC1_ALLOW_HTTP_NO_AUTH=true is set.

Limits

Read only Read-only by default: writes, transport changes, Git changes, data preview and free SQL each need their own SAP_ALLOW_* switch
Not covered Writes stay in package $TMP unless SAP_ALLOWED_PACKAGES widens them. The allowlist covers writes only, reads follow the SAP user's authorizations
Not covered SAPQuery long_text and application_log actions are offered on on-premise systems only, and application_log is hidden while SAP_BLOCKED_DATA_SOURCES is set
Size cap SAPQuery returns 100 rows by default, maxRows is clamped to 10,000, and data-preview bodies are capped at 2 MiB per tool call by default
Early release Multi-target BTP mode, including its scoped pinned PP writes, and the data-source blocklist are experimental and may change in a minor release
Limit Its makers call ADT use of this kind a grey area under SAP's API Policy and advise clearing it with SAP before adoption, dev and test included
Limit Boolean command-line flags need a value, as in --allow-writes true

Read-only by default: writes, transport and Git changes, table preview and free SQL each need their own SAP_ALLOW_* switch, and writes stay in package $TMP unless SAP_ALLOWED_PACKAGES widens them. That allowlist covers writes only; reads follow the SAP user's authorizations. With data access on, SAPQuery.maxRows is clamped to 10,000 and data-preview bodies to 2 MiB per call by default. Boolean flags need a value (--allow-writes true). Its makers say ADT use of this kind is a grey area under SAP's API Policy: usable at your own risk, worth raising with SAP before production. Multi-target BTP mode and the data-source blocklist are experimental.

Who it suits

Suits ABAP developers and SAP teams who want an assistant working against a real development system with guardrails an admin controls: read-only start, package allowlists, per-action deny lists, audit logging and per-user SAP identity on BTP. A single developer can run it with npx and basic credentials, and a team can host it once on BTP or Docker behind OIDC or XSUAA. It is not meant for business-data extraction, and it is not published by SAP. Organisations that need a vendor-supported route, or that cannot get approval for ADT access under their SAP agreement, should settle that first.

Tools 12

6 only read, 3 change things, 3 can delete or overwrite. A ? marks an optional parameter.

SAPRead: Reads ABAP source, single methods, DDIC and CDS objects, version history and, with data preview on, table contentstype: enumname?: stringinclude?: stringmethod?: stringgrep?: stringformat?: enumversion?: enummaxRows?: number
SAPSearch: Finds repository objects by name, looks up exact names in TADIR and searches source textquery?: stringsearchType?: enummaxResults?: numbernames?: arrayobjectType?: stringpackageName?: string
SAPWrite deletes: Creates, updates or deletes ABAP and DDIC objects with locking handled; offered only when writes are enabledaction: enumtype?: enumname?: stringsource?: stringpackage?: stringtransport?: stringactivate?: booleandryRun?: booleanobjects?: array
SAPActivate changes: Activates one or several objects and publishes or unpublishes OData service bindings; offered only when writes are enabledaction?: enumname?: stringtype?: stringobjects?: arraypreaudit?: boolean
SAPNavigate: Go-to-definition, find references and code completionaction: enumuri?: stringname?: stringline?: numbercolumn?: number
SAPQuery: Runs read-only ABAP SQL with free SQL on, and reads saved SAPscript long texts and SLG1 logs with data preview onaction?: enumsql?: stringmaxRows?: numberlongText?: objectapplicationLog?: object
SAPTransport deletes: Lists and inspects CTS transports; creating, releasing or deleting them needs transport writes enabledaction: enumid?: stringdescription?: stringpackage?: stringrecursive?: boolean
SAPGit deletes: Works with abapGit or gCTS repositories; clone, pull, push and commit need Git writes enabledaction: enumbackend?: enumrepoId?: stringurl?: stringbranch?: stringmessage?: string
SAPContext: Gathers dependency contracts and knowledge-transfer documents, where-used lists and CDS impactname: stringaction?: enumtype?: enumdepth?: number
SAPLint changes: Lints ABAP locally with release-aware rules and auto-fix, and formats code via SAP's pretty printeraction: enumsource?: stringname?: stringrules?: object
SAPDiagnose: Syntax checks, ABAP Unit runs, ATC findings, short dumps, traces and quick-fix proposalsaction: enumname?: stringtype?: stringobjects?: arrayid?: string
SAPManage changes: Probes system features, shows cache statistics, manages packages and Fiori launchpad catalogsaction: enumname?: stringobjectName?: stringnewPackage?: string

Popularity

56 popularity score, on our list (the bar is 36)

★ 253 ↓ 2.7k/wk

GitHub stars	253	28.9 points
npm downloads, last week	2,685	27.4 points

Measured 2026-11-07. How the score works.

Where it is published

Code	arc-mcp/arc-1 ★ 253
npm	arc-1 1.10.0, 2026-11-03

What it can reach

Runs	On your machine
Reaches	Your code, A database, The internet
Changes things	Yes: it can write, send, create or delete
Sign-in	Account credentials
Licence	MIT (npm)
Last code change	2026-11-06

Runs on your machine (or your own Docker or BTP host) and calls the SAP system's ADT API as the SAP user you configure, so it can do what that user's authorizations allow within the switches you set. Out of the box it registers no write, activate or SQL tools. SAP_ALLOW_WRITES lets it create, change, delete and activate ABAP objects in allowed packages. Separate flags allow transport release and Git pushes. SAP_ALLOW_DATA_PREVIEW opens table rows and, on on-premise systems, saved SAPscript texts and SLG1 log messages, all of which is application data. SAP_INSECURE=true turns off TLS verification for SAP. In HTTP mode it binds 0.0.0.0:8080 by default and will not start without API-key, OIDC or XSUAA auth unless ARC1_ALLOW_HTTP_NO_AUTH is set.

Over time

GitHub stars 253 +32 (+14 %)

253221

14 Oct 20267 Nov 2026

npm downloads a week 2.7k +2.2k (+426 %)

4.3k196

6 Apr 20267 Nov 2026

Before the site measured it, read from npm's daily download counts.

Popularity score 56 +1 (+2 %)

5855

14 Oct 20267 Nov 2026

What is rising across the directory

Sources

Page checked 2026-10-28.

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Or add it by command or config

Settings 12

What it does

What it needs

Limits

Who it suits

Tools 12

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