Parity gap — /copilot

Loom route: /copilot (renders CopilotConsoleView from lib/editors/cross-item-copilot-editor.tsx) Fabric reference: Fabric Copilot — https://learn.microsoft.com/fabric/get-started/copilot-fabric-overview (full-screen Copilot experience, multi-source grounding, tool-using) Loom screenshot: temp/parity/page-copilot-loom.png Captured: 2026-05-26 — 32 tools registered across 11 service categories

Phase 3 — Side-by-side gap matrix

#	Fabric Copilot full-screen element	Loom Copilot element	Status	Severity
1	Page header "Copilot"	"Loom Copilot" with subtitle "Orchestrate across every wired service from a single natural-language prompt"	present	—
2	Session list / "+ New session"	Present — "Sessions" panel with "+ New session" button, "No sessions yet" empty state	present	—
3	Tool palette showing capabilities	"Tools (32)" panel grouped by service: ADF (2), ADX (3), APIM (3), Activator (2), Databricks (4), Fabric (3), Foundry (1), Lakehouse (3), Loom (2), Power BI (3), Synapse (6)	present + richer than Fabric	—
4	Prompt input with rich attachments	Prompt input present	present	—
5	Streaming response with citations	SSE streaming from /api/copilot/orchestrate — verified in source	present	—
6	Tool-use trace (what tools were called, what they returned)	OrchestratorStep event types in source — full step-by-step trace	present	—
7	"Sources" panel showing grounding context	Per tool category in palette	partial — no per-prompt sources panel	MINOR
8	"Pin to canvas" / save snippet	Not visible	missing	MINOR
9	Honest gate when AOAI not deployed	Source: 503 with deep-link CTA when resolveAoaiTarget() throws NoAoaiDeploymentError	present + honest	—
10	Citation rendering with source link	citations rendering supported per cross-item-copilot-editor	present	—
11	Multi-turn conversation memory	Sessions persisted via /api/copilot/sessions	present	—
12	Stop / Cancel button during streaming	Not verified — would need live LLM call	unknown	—

Phase 4 — Functional verification

Control	Source	Result
Prompt input + Send	POSTs to /api/copilot/orchestrate with SSE response stream	OK — real
Session list	GET /api/copilot/sessions — real Cosmos	OK
Tools list	GET /api/copilot/tools returns 32 registered tools — verified live	OK
AOAI gate	Pre-flight resolveAoaiTarget() → if NoAoaiDeploymentError returns 503 so UI can show deep-link CTA	OK — honest
Session history	GET /api/copilot/sessions/[id] loads prior messages	OK
Streaming	ReadableStream + SSE events of OrchestratorStep per source	OK technically — needs live test for E2E

Backend reality check

// apps/fiab-console/app/api/copilot/orchestrate/route.ts
const stream = new ReadableStream({
  async start(controller) {
    const send = (event: string, data: unknown) => { /* SSE format */ };
    // Stream OrchestratorStep events from the orchestrator
    await orchestrate({ prompt, userOid, ... });
  },
});

Real SSE streaming, real AOAI orchestrator via @/lib/azure/copilot-orchestrator, honest 503 with deep-link when AOAI deployment is missing. 32 tools registered.

Honest grade

Grade: A-

Reasoning: - Phase 3: 0 BLOCKER, 0 MAJOR, 2 MINOR (no per-prompt sources panel, no pin-snippet). - Phase 4: 0 BROKEN — every visible control wires to real backend with honest gates. - 32 tools registered across 11 categories is a sophisticated orchestrator surface. - Session persistence is real (Cosmos-backed). - Streaming is real SSE.

Not A+ because: - Live LLM streaming wasn't end-to-end exercised in this validation (would need live AOAI deploy + a real prompt; that's a separate functional test). - Stop / Cancel during streaming not verified. - No "Sources" panel showing what tools were called per prompt (the trace is per-step but not aggregated into a "Sources" view).

This is the highest-quality top-level surface in CSA Loom.

Recommended next actions

1. Add per-prompt "Sources" panel summarizing which tools fired (already in step trace, just needs aggregation).
2. Add Stop button during streaming (cancellation via AbortController on the SSE stream).
3. Add "Pin to canvas" / save snippet (would persist a snippet doc + show in /browse pinned).
4. Verify Stop/Cancel functionally with a live AOAI deploy.
5. Surface the 32-tool list as a searchable command palette inside the Copilot view.