Query what abap2UI5 can express, from the verified capability map (CAPABILITIES.md — every entry names a proving port). Call this BEFORE deciding a UI5 feature cannot be built. Without arguments returns a summary; with query returns matching entries (status: direct | workaround | needs-live-test | not-expressible).

The canonical rulebook for writing an abap2UI5 app with the generic view builder (dispatcher skeleton, view/attribute idioms, binding and event rules). Read it once before generating ABAP.

Authoritative in/out-of-scope verdict for UI5 control entities (exists since UI5 <= 1.71, not deprecated), read from the OpenUI5 source JSDoc. Needs an OpenUI5 checkout (OPENUI5_SRC or ../fork-openui5).

Deploy an abap2UI5 app: writes .clas.abap (+ abapGit sidecar) into the gitignored dev sandbox src/zz_dev/ and lints it with the repo abaplint config. The class must implement z2ui5_if_app. After deploying, run build_backend once (rebuilds the transpiled Node backend), then run_app to see it. Set lint:false to skip the lint (faster, not recommended).

Fast static validation via ai-view-check, BEFORE the build/run loop: reconstructs the view from the z2ui5_cl_ai_xml builder calls (or takes raw view XML), runs the UI5 property gate (@since floor, deprecation) and renders it headless with a typed mock model. Seconds instead of a build+boot — use it after writing ABAP, then deploy_app once it is clean.

Rebuild the transpiled Node backend so run_app picks up deployed/edited ABAP. mode auto (default) is incremental when a prior full build exists: only src/zz_dev/ is re-copied and re-transpiled (~1-2 min). mode full runs the complete e2e-build (downport + transpile, tens of minutes) — needed once initially, or when framework/port sources changed, or when the incremental transpile rejects a construct (then simplify the ABAP or go full). Stops a running backend first.

Boot an app class headless in Chromium against the local backend (?app_start=) and LOOK at it: returns booted/ok, real page errors + failed backend calls (benign UI5 noise filtered), and a full-page screenshot as an image. The visual verification step of the loop — also works for the 276 existing ports and z2ui5_cl_ai_app_overview.

Manage the local express backend serving the transpiled apps: status | start | stop | restart. run_app starts it automatically; use this for diagnostics or to free the port.

Remove a previously deployed dev app from src/zz_dev/ (takes effect in the served backend after the next build_backend). Without class_name lists the deployed dev apps.