Multi Agent Investigations

ui/qvac/engine.js

@@ -445,7 +445,11 @@ export function createQvacEngine(deps) {
     const profile = getProfile(profileId || 'recommended')
     const prefs = deps.getPrefs?.() || {}
     const userLast = [...history].reverse().find((m) => m.role === 'user')
-    let system = buildSystemPrompt(deps.getContext?.() || {})
+    const ctx = {
+      ...(deps.getContext?.() || {}),
+      subAgents: prefs.subAgents !== false,
+    }
+    let system = buildSystemPrompt(ctx)
 
     // Light RAG only — full catalog dumps blow small context windows
     if (prefs.rag !== false && userLast?.content) {
@@ -457,16 +461,31 @@ export function createQvacEngine(deps) {
       if (rag) system += `\n\n${rag.slice(0, 1200)}`
     }
 
+    // Multi-agent briefing from parallel specialists (optional)
+    if (opts.agentBriefing) {
+      system += `\n\n${String(opts.agentBriefing).slice(0, 5000)}`
+    }
+
     const fullHistory = [
       { role: 'system', content: system },
       ...history.filter((m) => m.role !== 'system'),
     ]
 
     if (modelId && (sdkMode === 'main' || (sdk && sdk.completion))) {
-      return completeWithSdk(fullHistory, profile, opts)
+      return completeWithSdk(fullHistory, profile, opts, prefs)
     }
 
     status = status === 'ready' ? status : 'fallback'
+    // If multi-agent pack already ran, prefer its synthesis over naive fallback
+    if (opts.agentFallbackText) {
+      const text = String(opts.agentFallbackText)
+      if (opts.onToken) {
+        const chunk = 24
+        for (let i = 0; i < text.length; i += chunk) opts.onToken(text.slice(i, i + chunk))
+      }
+      opts.onEvent?.({ type: 'completionDone', stopReason: 'eos' })
+      return { contentText: text, toolCalls: opts.agentToolCalls || [], mode: 'fallback' }
+    }
     const result = await fallbackComplete(userLast?.content || '', deps.tools, {
       catalog: deps.getCatalog?.() || {},
       rag: prefs.rag !== false,
@@ -485,9 +504,14 @@ export function createQvacEngine(deps) {
     return result
   }
 
-  async function completeWithSdk(history, profile, opts) {
+  async function completeWithSdk(history, profile, opts, prefs = {}) {
+    const depthPref = prefs.toolDepth || 'auto'
+    const depth =
+      depthPref === 'core' || depthPref === 'deep'
+        ? depthPref
+        : undefined
     let toolDefs = profile.tools
-      ? deps.tools.defsForRole({ profileId: profile.id, profile })
+      ? deps.tools.defsForRole({ profileId: profile.id, profile, depth })
       : undefined
     const ctxSize = profile.ctxSize || 8192
     let toolsTok = estimateToolsTokens(toolDefs)