KQL Queryset — Parity gap (validator verdict 2026-05-26)

Grade: C (BLOCKER: textarea not Monaco/kusto)

Validator: v2 4-phase live-browser + source-code review.

Loom URL: https://loom-console-fvbbctd4eehqbkcs.b02.azurefd.net/items/kql-queryset/573f749a-d5c5-48e3-86ea-da3b206e32b6

Loom screenshot: temp/parity/kql-queryset-loom.png.

Phase 1 — Fabric reference (from spec)

Multi-tab query workspace embedded under a parent DB. Top tabs: Eventhouse / Database / Queryset (active). Internal query tabs with rename + close + add (+). Toolbar per tab: Run, Preview, Recall (query history), Share query, Save to Dashboard, KQL Tools, Export to CSV, Power BI report, Add alert. Editor: line-numbered Monaco with kusto language service, IntelliSense, syntax highlighting, pre-populated template with documentation links. Results pane with sortable columns, filters, type indicators, viz toggle, timestamp. Left sidebar shows parent DB context (System overview / Databases / Monitoring / Search box / KQL databases tree).

Phase 2 — Loom under test (live)

Left rail: "Queries" tree with + New button. Each saved query is a leaf with a delete (×) trailing button. Main area: ribbon (Home with Run / Save groups, static labels) + toolbar (title input, db badge, "unsaved" badge if dirty, Save button, Run primary button). Below: a <textarea className={s.monaco}> seeded from SAMPLE_QS ('print smoke = "ok", server_time = now()'). Below the textarea: KqlResultsPanel rendering rows as a Fluent <Table> with execution time / row count badges.

Source confirmation: apps/fiab-console/lib/editors/phase3-editors.tsx lines 409-553.

Critical line 540: <textarea className={s.monaco} …> — same vaporware-marker pattern as kql-database. Same BLOCKER per workflow contract.

Saved queries persist via PUT /api/items/kql-queryset/{id} with {queries:[…]}.

Package check: zero @monaco-editor/react, zero @kusto/monaco-kusto.

Phase 3 — Side-by-side gap matrix

Fabric element	Loom	Severity
Monaco editor with kusto language service + IntelliSense + error squiggles	Missing — vanilla <textarea> with monaco CSS class	BLOCKER (workflow contract Phase 4 check #1)
Syntax highlighting (comments / keywords / operators)	Missing	BLOCKER
Line numbers	Missing	MAJOR
Autocomplete (Ctrl+Space, KQL keywords + table/column suggestions)	Missing	BLOCKER
Pre-populated template with KQL docs links	Missing — single-line print smoke	MINOR
Multi-tab per-query editor (rename + add (+) + close)	Partial — left rail tree of saved queries with rename via top input. No tab strip in main body	MAJOR
Eventhouse / Database / Queryset top tab nav	Missing — Loom uses item-type routing instead	MAJOR
Toolbar: Run	Present	(positive)
Toolbar: Preview (sample results)	Missing	MAJOR
Toolbar: Recall (query history)	Missing	MAJOR
Toolbar: Share query	Missing	MAJOR
Toolbar: Save to Dashboard	Missing	MAJOR
Toolbar: KQL Tools	Missing	MAJOR
Toolbar: Export to CSV	Missing	MAJOR
Toolbar: Power BI report	Missing	MAJOR
Toolbar: Add alert	Missing	MAJOR
Results pane with chart-view toggle	Missing — table only	BLOCKER (workflow contract check #5)
Real-time validation (red squiggle)	Missing	BLOCKER
Save (persists query)	Present — PUT /api/items/kql-queryset/{id} works	(positive)
Add new tab (+)	Present (Left rail "+ New")	(positive, but Fabric semantics differ)
Rename tab	Present (title input)	(positive)
Delete tab	Present (× button on each leaf)	(positive)
Status bar (db connected, language=kusto, row N)	Missing	MINOR
Honest MessageBar for missing dashboard / alert / Power BI infra	Missing	MAJOR
Copilot integration	Missing	MAJOR

Phase 4 — Functional click-every-button verification

Loom control	Result
GET /api/items/kql-queryset/{id}	200 — {ok:true, database:"loomdb-default", queries:[]}
PUT /api/items/kql-queryset/{id} body={queries:[…]}	200 — persists
POST /api/items/kql-queryset/{id}/run body=print smoke="ok"	200 — real ADX execution: {columns:["smoke"], rows:[["ok"]], rowCount:1, executionMs:15}. PRIMARY ACTION WORKS
Run button	Fires query → results panel renders. Works
Save button	PUT returns 200, dirty cleared. Works
+ New (left rail)	Adds a new query to the local list, marks dirty
Delete on a query leaf	Removes it from the list, marks dirty
Title input	Updates draft title
Ribbon: Run / Cancel / Save query / Save to dashboard / Set alert	Mostly no-op — Run/Save are not ribbon-bound (the editor has its own toolbar Run/Save buttons). Save to dashboard / Set alert are silently dead. BROKEN for the dead ones
Editor textarea	Updates draft.kql state
Shift+Enter shortcut	Fires run()

Verdict

C-grade. Real backend (KQL executes against real ADX adx-csa-loom-shared), primary actions (Run, Save) work, multi-query CRUD works (add/delete/rename), but: - Editor is a textarea, not Monaco → BLOCKER per workflow contract - No IntelliSense, no syntax highlighting, no kusto language service → BLOCKER - No chart-view toggle on results → BLOCKER per workflow contract - No real-time validation / squiggles → BLOCKER per workflow contract - 6+ ribbon/toolbar features missing (Preview, Recall, Share, Save to Dashboard, KQL Tools, Export CSV, Power BI report, Add alert) - Ribbon "Save to dashboard" / "Set alert" silently dead → BROKEN per no-vaporware.md - No Copilot NL2KQL

Same fundamental issue as kql-database: the run path is real and works, but the editor surface is scaffold-grade.

Required for ≥ B grade

1. Replace <textarea className={s.monaco}> with real @monaco-editor/react
2. @kusto/monaco-kusto language service.
3. Implement IntelliSense via kusto-monaco's schema-aware completion provider. Feed it the parent DB's schema (.show database schema as json).
4. Real-time validation with red-squiggle error markers.
5. Chart View toggle on the results panel (recharts).
6. Wire toolbar Export to CSV (download Blob from result.rows).
7. Recall = list previously-executed queries (already stored as SavedQuery — surface as a dropdown).
8. Multi-tab strip in the main body (matching Fabric's inline tabs) instead of only the left rail.
9. For Save to Dashboard / Set alert / Power BI report buttons, surface honest MessageBar per no-vaporware.md if those backends aren't deployed.

Estimated effort to B: 2 focused sessions (Monaco + chart + CSV export). To A: 4 sessions (full toolbar + multi-tab strip + Copilot).

Evidence

• Live API calls (validator run):
• GET .../kql-queryset/573f749a-… → 200
• POST .../run body={kql:"print smoke=\"ok\""} → 200 with real ADX result
• Source code: apps/fiab-console/lib/editors/phase3-editors.tsx lines 409-553.
• Package check: no @monaco-editor/react, no @kusto/monaco-kusto.
• Screenshot: temp/parity/kql-queryset-loom.png.