Arc 1 Skills

ARC-1 — Primary ADT MCP for Agentic ABAP Development

arc-1 is the PRIMARY ADT MCP of this orchestrator. All ADT-class operations (read source, edit, activate, lint, transport) route to arc-1 first, then aibap (secondary), then mcp-sap-gui (fallback). See scripts/sap_router.py (SapRouter.get_route()).

1. Tool Map — When to Use Which

Rule of thumb: read-only questions -> SAPSearch/SAPRead/SAPNavigate. Changes -> SAPLint -> SAPManage -> SAPTransport. Failures -> SAPDiagnose.

2. Route Through the Orchestrator

# Let the router pick arc-1 (ADT-first) for the action:
npm run router -- --action ADT_READ_SOURCE
python scripts/sap_router.py route --action ADT_EDIT_CLASS

# Force GUI fallback only when ADT cannot do it (SPRO, dynpro):
npm run router:gui -- --action SPRO_CONFIG

If arc-1 is down, the TieredFallback engine (scripts/fallback_engine.py) cascades ADT -> RFC -> GUI -> BDC -> Offline -> Manual. Do not hand-code fallbacks.

3. Typical Flow: Read -> Edit -> Activate -> Transport

1. Context — SAPContext to confirm system/client (never assume DEV).
2. Locate — SAPSearch for the object; SAPNavigate to find the exact include/method.
3. Read — SAPRead to get current source. Edit surgically (Karpathy: touch only what's needed).
4. Lint — SAPLint on the modified source. Fix findings before writing.
5. Write — SAPManage to save the change (object goes INACTIVE).
6. Activate — SAPManage activate. An inactive object is invisible to runtime.
7. Transport — SAPTransport to assign the object to a modifiable request. Release only at gate (npm run abap:review:transport).
8. Verify — SAPRead the active version back; SAPDiagnose if execution dumps.

4. Health and Learning

# Probe arc-1 (HIGH criticality) + .env completeness:
npm run hc
npm run hc:prompt      # interactive fix for missing SAP_HOST/SAP_USER/SAP_PASSWORD

# Feed routing telemetry so self_learn.py keeps arc-1 primary:
npm run learn:mcp -- --mcp arc-1 --latency 245 --success true
npm run learn:route -- --action ADT_EDIT_CLASS --success true

Pitfalls

• 401/403 on every arc-1 call → Cause: SAP credentials missing or wrong in .env, or user lacks S_DEVELOP. Solution: run npm run hc:prompt to fill SAP host/user/password; confirm developer role with Basis.
• "Object locked by user X" → Cause: object is edit-locked in SE80/ADT by another session (or a stale lock of your own). Solution: retry later or ask the lock owner to release (SM12); never force-delete locks on shared objects.
• Change saved but behavior unchanged → Cause: object left INACTIVE — SAPManage save without activate. Solution: always activate after write and re-read the active version to confirm.
• Activation fails with syntax errors → Cause: edit broke dependent objects or lint step was skipped. Solution: run SAPLint before SAPManage write; use SAPNavigate where-used to check dependents; SAPDiagnose for details.
• "Not assigned to a transport" on save → Cause: object in a transportable package but no modifiable request. Solution: SAPTransport create/assign a workbench request first, or use $TMP for throwaway objects.
• arc-1 timeout / connection refused → Cause: MCP server down or SAP host unreachable. Solution: npm run hc to confirm; router auto-falls back to aibap then GUI — do not bypass the fallback engine.

Verification

# 1. arc-1 healthy and env complete:
npm run hc

# 2. Router resolves an ADT action to arc-1 (primary):
python scripts/sap_router.py route --action ADT_READ_SOURCE

# 3. After an edit: SAPRead the object and confirm version = active,
#    then gate before release:
npm run abap:review:transport

Related

• sap-router-skill — master routing tree (ADT -> arc-1 first, GUI fallback)
• abap-code-review — 9-dimension GO/NO-GO gate before SAPTransport release
• sap-transport-gate / sap-transport-management — transport landscape rules
• karpathy-guidelines — Think, Simplify, Surgical, Goal-Verify wrapper for every edit