MCP serverMCP serverExposes tools to a coding agent over MCP.See every one →What this type is →independently maintainedindependently maintainedPublished by one person or a small company outside SAP. Says nothing about quality; the readings say that.See every one →
ZARC1_EXTENSION_FORMS
An extension of four tools for arc-1arc-1An MCP server in front of the ADT REST API that runs locally and on Cloud Foundry with twelve tools that read, search, write, activate, lint and transport ABAP objects.independent, abap, with an ABAP backend behind it, that reaches the classic form objects ADT has no API for: SAPscript layout sets, Smart Styles and the TADIR record of a Smart Form.
SAPscript layout sets (FORM), Smart Styles (SSST) and Smart Forms (SSFO) predate ABAP Development Tools and have no ADT read API, so arc-1arc-1An MCP server in front of the ADT REST API that runs locally and on Cloud Foundry with twelve tools that read, search, write, activate, lint and transport ABAP objects.independent, abap cannot reach them on its own. This adds four Custom_* tools: two reads return any TADIR object's existence, package and author and list the text IDs a SAPscript form stores its texts under, and two writes create, update or delete a SAPscript window text and create, overwrite or delete a Smart Style, activating it by default. The backend is classic CDS views published as OData V2 and a small SEGW service for the write actions, imported with abapGitabapGitA Git client written in ABAP that runs inside the system, so objects are cloned, pulled and pushed without leaving it; with no package manager in ABAP, a cloned repository is how code is distributed.community org, abap into a package such as ZARC_1_EXTENSION; it targets SAP_BASIS 7.5x and needs no RAP. Smart Form content is the part it leaves alone: the README traces SSF_SAVE_FORM to function-group state that a stateful Form Painter call sequence builds up, so for a Smart Form only the existence check applies.
Facts
Last pushLicenceApache-2.0
Where it sits
Lives in
Provides
Agent access to your codeABAPAgent access to your codeLetting a coding agent read the project or the system you actually have, reach its model, its objects and its checks, and act on it. In file-based environments that works out of the box; complex systems need dedicated access capabilities. Whatever the environment, the agent also needs project- and framework-specific context, so it understands the thing in front of it rather than guessing from what it remembers of its training data. The transport is incidental: an MCP server, a language server or a CLI answer the same question, and what differs between them is how much of the real thing the agent can see. Distinct from [MCP servers](capability:mcp-servers), which is a protocol adapter on your own running service, and from [agent guidance](capability:agent-guidance), which is knowledge handed over as files rather than read from the thing itself.
Flavors
Requires
arc-1arc-1the MCP server the extension is loaded into with ARC1_PLUGINS; the four tools exist only inside it
Optional
abapGitabapGitpulling the ABAP backend into a package; without it the two CDS views are created by hand from the files in src/
Who is behind it
F-WerF-WerMaintains this
In the atlas: maintains 1, contributes to 1@F-Wermaintainer
In the atlas: maintains 1, contributes to 1@F-Wermaintainer
Before choosing this
Conditions
PracticalFunctional boundary
Smart Form content cannot be read or written, and HR Forms (PE51) are not implemented. Installing it needs SAP GUI or WebGUI once, to register the OData services in /IWFND/MAINT_SERVICE and to redefine the write service in SEGW, and the extension is built against a locally linked ARC-1.
PolicySAP API Policy 4.2026a§ 1.1, 1.2, 2.2.2from Agent access to your codeAn MCP server calls ADT or another SAP API of a running system for an agent.
- § 1.1 Published APIs. Published APIs are made available for the documented purposes identified by SAP, including integration, extensions and data exchange.
- § 1.2 Non-Published APIs. Customer and third-party applications must not access non-published APIs except where documentation permits it or SAP otherwise authorizes it.
- § 2.2.2 AI call sequences and data extraction. Outside SAP-endorsed architectures, data services or expressly identified pathways, the policy prohibits specified agentic API use and systematic or large-scale extraction.
An agent that plans and executes ADT calls is the case section 2.2.2 names. Check that the endpoints are published for the intended use, and that the design runs within a pathway SAP identifies for it.
SAP API Policy 4.2026a →What it declares
Every artifact
- Type
- MCP server
- Origin
- Independently maintained
As an MCP server
- Tools
- 4
- Guardrails
1 quoted from README, ARC-1 tools show all
The write tools require both opt-ins:
For agent access to your code
- Read
- sourcesearchwhere-usedDDICCDStable data
- Change
- writecreateactivatetransportsgit
- Check
- syntaxATCABAP Unit
- Run
- run codedumps
Connections
Group by
NodeRelationBasis
Functional
Agent access to your codeAgent access to your codeLetting a coding agent read and act on your project or systemSAP and community, unassessed
provides
stated
provides Agent access to your code
Reaches the classic form objects ADT does not list: an agent connected to [arc-1](artifact:arc-mcp-arc-1) reads and writes SAPscript window texts and Smart Styles, and checks any TADIR object for its existence, package and author.
“These object types predate ABAP Development Tools and have no ADT read API.”“ARC-1 extension: read classic form objects (Smart Forms, Smart Styles, SAPscript) with no ADT API — ABAP backend (package ZARC_1_EXTENSION) + TypeScript ARC-1 plugin.”
Letting a coding agent read and act on your project or system
Technical
arc-1arc-1MCP server over the ADT REST API for ABAP objectsindependent, abap
needs
stated
needs arc-1
the MCP server the extension is loaded into with `ARC1_PLUGINS`; the four tools exist only inside it
“# ARC-1 currently needs to be linked locally.”“extension for classic SAP form objects that ARC-1 core cannot access through ADT”
MCP server over the ADT REST API for ABAP objects
abapGitabapGitGit client written in ABAP that runs inside the systemcommunity org, abap
optionally needs
stated
optionally needs abapGit
the ABAP backend is pulled from the repository rather than created by hand
pulling the ABAP backend into a package; without it the two CDS views are created by hand from the files in `src/`
“Pull the repository with abapGit into a package such as `ZARC_1_EXTENSION` (or another transportable package).”“If abapGit is unavailable, create the two DDLS objects”
Git client written in ABAP that runs inside the system
Download
Architecture
Download
ZARC1_EXTENSION_FORMSAn extension of four tools for arc-1, with an ABAP backend behind it, that reaches the classic form objects ADT has no API for: SAPscript layout sets, Smart Styles and the TADIR record of a Smart Form.independent, abap
arc-1An MCP server in front of the ADT REST API that runs locally and on Cloud Foundry with twelve tools that read, search, write, activate, lint and transport ABAP objects.independent, abap
abapGitA Git client written in ABAP that runs inside the system, so objects are cloned, pulled and pushed without leaving it; with no package manager in ABAP, a cloned repository is how code is distributed.community org, abap
Your MCP client → ZARC1_EXTENSION_FORMSStated in the document, dataBy its type: an MCP server is called by an MCP client
ZARC1_EXTENSION_FORMS → arc-1Documented onlythe MCP server the extension is loaded into with
ARC1_PLUGINS; the four tools exist only inside itZARC1_EXTENSION_FORMS → abapGitDocumented only, under a conditionpulling the ABAP backend into a package; without it the two CDS views are created by hand from the files in
src/If the ABAP backend is pulled from the repository rather than created by handSAPnot SAP's, or the project's ownstated in the documentdocumented onlyunder a condition
README
quoted from F-Wer/ZARC1_EXTENSION_FORMS under Apache-2.0, readF-Wer/ZARC1_EXTENSION_FORMS/README.mdthe maintainer’s wordsOn GitHub
ZARC1_EXTENSION_FORMS
An ARC-1 extension for classic SAP form objects that ARC-1 core cannot access through ADT: Smart Forms (SSFO), Smart Styles (SSST), and SAPscript layout sets (FORM, transaction SE71).
These object types predate ABAP Development Tools and have no ADT read API. This was verified on a live SAP system: they have no ADT discovery entry, the generic ADT vit fallback returns HTTP 400, and the Repository Information System does not list them. The full evidence trail is in ai.md.
The extension uses parameterized classic CDS views published as OData V2, plus a small SEGW service for write actions. It targets SAP_BASIS 7.5x or later and deliberately does not require RAP, behavior definitions, or query-provider classes.
What is supported
| Object type | Supported capability | Status |
|---|---|---|
| Any TADIR object type | Check existence, package, and author | Live-verified |
SAPscript FORM | Discover text IDs; create, update, or delete window text | Live-verified end to end; read-back is byte-exact |
Smart Style (SSST) | Create or overwrite, read, activate, and delete styles | Live-verified end to end |
Smart Form (SSFO) | Existence and TADIR metadata only | Content read/write is not available |
HR Forms (PE51) | Not implemented | Requires verification on an HR-enabled SAP system |
Repository layout
src/ ABAP backend — abapGit mirror of package ZARC_1_EXTENSION
plugin/ TypeScript ARC-1 extension (arc1-plugin-formobjects)
ai.md Evidence trail, implementation notes, and SAP-specific gotchas
research/ Research for SSFO, SSST, FORM, and PE51
PROGRESS.md Handoff tracker for research work
Backend
| Object | Purpose | Reachable via |
|---|---|---|
ZI_ARC1_FORMOBJ (CDS view) | TADIR existence, package, and author for any object type | OData V2 ZI_ARC1_FORMOBJ_CDS |
ZI_ARC1_FORM_WINDOWS (CDS view) | STXL text IDs (TDID) belonging to a SAPscript FORM | OData V2 ZI_ARC1_FORM_WINDOWS_CDS |
ZCL_ARC1_FORM_WINDOW_WRITE | Writes one SAPscript FORM text ID via SAVE_TEXT | WriteFormWindowText OData action |
ZCL_ARC1_SMART_STYLE_RW | Creates, reads, activates, and deletes Smart Style content | WriteSmartStyle OData action; style reads use SAP tables |
ZCL_ZI_ARC1_FORM_WINDO_DPC_EXT | Dispatches the form-window and Smart Style OData actions | OData V2 ZI_ARC1_FORM_WINDOWS_CDS_SRV |
ARC-1 tools
All four tools are verified against a real SAP system.
| Tool | Scope | What it does |
|---|---|---|
Custom_ReadFormObject | read | Returns existence, package, and author for SSFO, SSST, FORM, or any other TADIR object type. |
Custom_ReadFormWindows | read | Lists the TDID values under which a SAPscript form stores text. Use ARC-1 core's SAPRead(type="CLUSTER_READ", ...) to decode a text's content. |
Custom_WriteFormWindows | write | Creates, updates, or—when lines is empty—deletes a SAPscript form text. |
Custom_WriteSmartStyle | write | Creates or overwrites a Smart Style and activates it by default. Empty paragraphs and characterFormats delete the style. Optional package and transport parameters support transportable objects. |
The write tools require both opt-ins:
SAP_ALLOW_PLUGIN_RAW_WRITES=true
SAP_ALLOW_WRITES=trueSee plugin/README.md for the exact tool inputs and command-line examples.
Smart Forms and Smart Styles: the important distinction
Smart Form (SSFO) content cannot be exposed through one safe external call. SSF_SAVE_FORM depends on function-group-global state built up by a stateful Form Painter call sequence. The functions that build the node and token tree are private subroutines, not callable function modules. Details and source-level evidence are in research/SSFO.md.
Smart Style (SSST) content is supported. A Smart Style is a flat catalogue of paragraph and character formats. SSF_SAVE_STYLE and SSF_READ_STYLE are self-contained APIs, so the backend can safely create, read, activate, and delete styles. Custom_WriteSmartStyle is live-verified end to end: create and publish, SAPQuery read-back, and delete. See research/SSST.md.
Installation
1. Install the ABAP backend
Pull the repository with abapGit into a package such as ZARC_1_EXTENSION (or another transportable package). The two CDS views and backend classes are in src/.
If abapGit is unavailable, create the two DDLS objects from src/zi_arc1_formobj.ddls.asddls and src/zi_arc1_form_windows.ddls.asddls, then activate them.
2. Register the read services once
This requires SAP GUI or WebGUI because neither ADT nor SICF provides a REST API to register a new service:
- Run
/IWFND/MAINT_SERVICE. - Choose Add Service, select system alias
LOCAL(or the system-specific alias), search forZI_ARC1_FORMOBJ, and add it. - Repeat for
ZI_ARC1_FORM_WINDOWS.
Verify that /sap/opu/odata/sap/ZI_ARC1_FORMOBJ_CDS/$metadata returns HTTP 200.
3. Enable write actions once
@OData.publish: true cannot declare OData actions. In SEGW, redefine ZI_ARC1_FORM_WINDOWS_CDS and generate the separate ZI_ARC1_FORM_WINDOWS_CDS_SRV service. Register that _SRV service in /IWFND/MAINT_SERVICE as well.
Add the WriteFormWindowText and WriteSmartStyle actions and use the implementation in src/zcl_zi_arc1_form_windo_dpc_ext.clas.abap for /IWBEP/IF_MGW_APPL_SRV_RUNTIME~EXECUTE_ACTION. The detailed action parameters, serialization details, and common Gateway pitfalls are documented in ai.md.
4. Build and load the ARC-1 extension
git clone https://github.com/F-Wer/ZARC1_EXTENSION_FORMS.git
cd ZARC1_EXTENSION_FORMS/plugin
# ARC-1 currently needs to be linked locally.
(cd /path/to/arc-1 && npm run build && npm link)
npm install
npm link arc-1
npm run build
ARC1_PLUGINS=/absolute/path/to/ZARC1_EXTENSION_FORMS/plugin/dist/index.js \
arc1 --transport http-streamableFor BTP Cloud Foundry or Docker deployments, ship plugin/dist/ with ARC-1. Ensure that the plugin files are owned by the ARC-1 runtime user; a plain Docker COPY can leave them owned by root, which the loader rejects.
Non-goals and limitations
- Smart Form content cannot currently be read or written. There is one unfinished cluster-decoding avenue for reads, but it requires an ARC-1 core enhancement for multi-object data clusters.
- Smart Style content is writable through the extension; direct content reads currently use core
SAPQueryonSTXSHEAD,STXSPARA, andSTXSCHAR. - HR Forms (
PE51) were not investigated live because the development system has no HR component installed.
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Details
Sources
Sources are graph entities: the same page may back several entries, and an unreachable source flags every row that rests on it.
Compatibility and provenance
discovered viaAdded by hand
first seen in the atlas
ecosystem and domainabap, ai-and-agents
Flavors
Standard ABAP
“It targets SAP_BASIS 7.5x or later and deliberately does not require RAP, behavior definitions, or query-provider classes.” — F-Wer/ZARC1_EXTENSION_FORMS — README
History in the atlas
- Entered by intake from the repository README and description.
- First seen.
For your agent
- Ref
artifact:f-wer-zarc1-extension-forms- JSON
- /artifacts/f-wer-zarc1-extension-forms.json
- MCP
- Connecting an agent