feat: Cookie Banner Check as standalone tab in Compliance Agent

New "Banner-Check" tab with:
- URL input → Playwright 3-phase test (before/reject/accept)
- Shield icon + provider detection
- Progress bar with pass/fail percentage
- 3-phase summary (cookies + scripts per phase)
- Violations (red) and passes (green) in structured list

Backend: new POST /api/compliance/agent/banner-check endpoint
that proxies to consent-tester:8094/scan.

Next step: Upgrade banner checks to L1/L2 format with expert
hints (same quality as document checks).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

admin-compliance/app/api/sdk/v1/agent/banner-check/route.ts

@@ -0,0 +1,42 @@
+/**
+ * Banner Check API Proxy — calls consent-tester /scan endpoint
+ *
+ * POST /api/sdk/v1/agent/banner-check → runs 3-phase cookie banner test
+ */
+
+import { NextRequest, NextResponse } from 'next/server'
+
+const BACKEND_URL = process.env.BACKEND_API_URL || 'http://backend-compliance:8002'
+
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.json()
+    const { url } = body
+
+    if (!url) {
+      return NextResponse.json({ error: 'URL erforderlich' }, { status: 400 })
+    }
+
+    // Call backend which proxies to consent-tester
+    const response = await fetch(`${BACKEND_URL}/api/compliance/agent/banner-check`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ url }),
+      signal: AbortSignal.timeout(120000), // 2 min for Playwright
+    })
+
+    if (!response.ok) {
+      const errorText = await response.text()
+      return NextResponse.json(
+        { error: `Backend: ${response.status}`, detail: errorText },
+        { status: response.status },
+      )
+    }
+
+    const data = await response.json()
+    return NextResponse.json(data)
+  } catch (error) {
+    const msg = error instanceof Error ? error.message : 'Unknown error'
+    return NextResponse.json({ error: msg }, { status: 500 })
+  }
+}

admin-compliance/app/sdk/agent/_components/BannerCheckTab.tsx

@@ -0,0 +1,232 @@
+'use client'
+
+import React, { useState } from 'react'
+
+interface BannerResult {
+  banner_detected: boolean
+  banner_provider: string
+  banner_text: string
+  banner_checks?: {
+    violations: { code: string; text: string; severity: string }[]
+    passes: { code: string; text: string }[]
+  }
+  phases?: {
+    before_consent: { cookies: number; scripts: number; violations: string[] }
+    after_reject: { cookies: number; scripts: number; violations: string[] }
+    after_accept: { cookies: number; scripts: number; violations: string[] }
+  }
+}
+
+export function BannerCheckTab() {
+  const [url, setUrl] = useState('')
+  const [loading, setLoading] = useState(false)
+  const [progress, setProgress] = useState('')
+  const [error, setError] = useState<string | null>(null)
+  const [result, setResult] = useState<BannerResult | null>(null)
+
+  const handleScan = async (e: React.FormEvent) => {
+    e.preventDefault()
+    if (!url.trim()) return
+
+    setLoading(true)
+    setError(null)
+    setResult(null)
+    setProgress('Cookie-Banner wird analysiert...')
+
+    try {
+      const res = await fetch('/api/sdk/v1/agent/banner-check', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ url: url.trim() }),
+      })
+      if (!res.ok) throw new Error(`Fehler: ${res.status}`)
+      const data = await res.json()
+
+      if (data.scan_id) {
+        // Async polling
+        let attempts = 0
+        while (attempts < 60) {
+          await new Promise(r => setTimeout(r, 3000))
+          const poll = await fetch(`/api/sdk/v1/agent/banner-check?scan_id=${data.scan_id}`)
+          if (!poll.ok) { attempts++; continue }
+          const pollData = await poll.json()
+          if (pollData.progress) setProgress(pollData.progress)
+          if (pollData.status === 'completed' && pollData.result) {
+            setResult(pollData.result)
+            break
+          }
+          if (pollData.status === 'failed') throw new Error(pollData.error || 'Scan fehlgeschlagen')
+          attempts++
+        }
+      } else {
+        setResult(data)
+      }
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Unbekannter Fehler')
+    } finally {
+      setLoading(false)
+      setProgress('')
+    }
+  }
+
+  const violations = result?.banner_checks?.violations || []
+  const passes = result?.banner_checks?.passes || []
+  const total = violations.length + passes.length
+
+  return (
+    <div className="space-y-4">
+      <div className="bg-blue-50 border border-blue-200 rounded-lg p-4">
+        <h3 className="text-sm font-semibold text-blue-900">Cookie-Banner Compliance Check</h3>
+        <p className="text-xs text-blue-700 mt-1">
+          Playwright-basierter 3-Phasen-Test: Vor Interaktion, nach Ablehnen, nach Akzeptieren.
+          Prueft Dark Patterns, Pre-Consent-Cookies, Farbkontrast, Klick-Paritaet und 20+ weitere Kriterien.
+        </p>
+      </div>
+
+      <form onSubmit={handleScan} className="flex gap-3">
+        <input
+          type="url" value={url} onChange={e => setUrl(e.target.value)}
+          placeholder="https://www.example.com/"
+          className="flex-1 px-4 py-3 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-transparent text-sm"
+          disabled={loading} required
+        />
+        <button type="submit" disabled={loading || !url.trim()}
+          className="px-6 py-3 bg-purple-600 text-white rounded-lg hover:bg-purple-700 disabled:opacity-50 transition-colors flex items-center gap-2 text-sm font-medium">
+          {loading ? (
+            <><svg className="animate-spin w-4 h-4" fill="none" viewBox="0 0 24 24">
+              <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
+              <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z" />
+            </svg>Pruefe...</>
+          ) : 'Banner pruefen'}
+        </button>
+      </form>
+
+      {progress && (
+        <div className="bg-purple-50 border border-purple-200 rounded-lg p-4 text-sm text-purple-700 flex items-center gap-3">
+          <svg className="animate-spin w-5 h-5 text-purple-500 shrink-0" fill="none" viewBox="0 0 24 24">
+            <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
+            <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z" />
+          </svg>
+          {progress}
+        </div>
+      )}
+
+      {error && (
+        <div className="bg-red-50 border border-red-200 rounded-lg p-4 text-sm text-red-700">{error}</div>
+      )}
+
+      {result && (
+        <div className="bg-white border border-gray-200 rounded-xl shadow-sm overflow-hidden">
+          {/* Header */}
+          <div className="px-6 py-4 bg-gray-50 border-b border-gray-200">
+            <div className="flex items-center justify-between">
+              <div>
+                <div className="flex items-center gap-3">
+                  <span className={`text-2xl`}>
+                    {result.banner_detected ? '🛡️' : '⚠️'}
+                  </span>
+                  <div>
+                    <h3 className="text-sm font-semibold text-gray-900">
+                      {result.banner_detected
+                        ? `Banner erkannt: ${result.banner_provider || 'Unbekannter Anbieter'}`
+                        : 'Kein Cookie-Banner erkannt'}
+                    </h3>
+                    {total > 0 && (
+                      <p className="text-xs text-gray-500 mt-0.5">
+                        {passes.length}/{total} Pruefungen bestanden
+                      </p>
+                    )}
+                  </div>
+                </div>
+              </div>
+              {total > 0 && (
+                <div className="flex items-center gap-2">
+                  <div className="w-24 h-2 bg-gray-200 rounded-full overflow-hidden">
+                    <div
+                      className={`h-full rounded-full ${violations.length === 0 ? 'bg-green-500' : violations.length <= 3 ? 'bg-yellow-500' : 'bg-red-500'}`}
+                      style={{ width: `${Math.round(passes.length / total * 100)}%` }}
+                    />
+                  </div>
+                  <span className={`text-xs font-medium ${violations.length === 0 ? 'text-green-700' : 'text-red-700'}`}>
+                    {Math.round(passes.length / total * 100)}%
+                  </span>
+                </div>
+              )}
+            </div>
+          </div>
+
+          {/* 3-Phase Summary */}
+          {result.phases && (
+            <div className="px-6 py-3 border-b border-gray-100 grid grid-cols-3 gap-4">
+              {[
+                { label: 'Vor Consent', data: result.phases.before_consent, icon: '🔒' },
+                { label: 'Nach Ablehnen', data: result.phases.after_reject, icon: '🚫' },
+                { label: 'Nach Akzeptieren', data: result.phases.after_accept, icon: '✅' },
+              ].map(phase => (
+                <div key={phase.label} className="text-center">
+                  <div className="text-lg">{phase.icon}</div>
+                  <div className="text-xs font-medium text-gray-700">{phase.label}</div>
+                  <div className="text-xs text-gray-500 mt-1">
+                    {phase.data.cookies} Cookies, {phase.data.scripts} Scripts
+                  </div>
+                  {phase.data.violations.length > 0 && (
+                    <div className="text-xs text-red-600 font-medium">
+                      {phase.data.violations.length} Verstoesse
+                    </div>
+                  )}
+                </div>
+              ))}
+            </div>
+          )}
+
+          {/* Violations */}
+          {violations.length > 0 && (
+            <div className="px-6 py-4">
+              <h4 className="text-xs font-semibold text-red-700 uppercase tracking-wide mb-2">
+                Verstoesse ({violations.length})
+              </h4>
+              <div className="space-y-2">
+                {violations.map((v, i) => (
+                  <div key={i} className="flex items-start gap-2">
+                    <svg className="w-4 h-4 text-red-500 mt-0.5 shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
+                    </svg>
+                    <div>
+                      <div className="text-sm text-red-700">{v.text}</div>
+                      <div className="text-xs text-gray-400 mt-0.5">{v.code} | {v.severity}</div>
+                    </div>
+                  </div>
+                ))}
+              </div>
+            </div>
+          )}
+
+          {/* Passes */}
+          {passes.length > 0 && (
+            <div className="px-6 py-4 border-t border-gray-100">
+              <h4 className="text-xs font-semibold text-green-700 uppercase tracking-wide mb-2">
+                Bestanden ({passes.length})
+              </h4>
+              <div className="space-y-1">
+                {passes.map((p, i) => (
+                  <div key={i} className="flex items-start gap-2">
+                    <svg className="w-4 h-4 text-green-500 mt-0.5 shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
+                    </svg>
+                    <div className="text-sm text-gray-600">{p.text}</div>
+                  </div>
+                ))}
+              </div>
+            </div>
+          )}
+
+          {!result.banner_detected && violations.length === 0 && passes.length === 0 && (
+            <div className="px-6 py-4 text-sm text-gray-500">
+              Kein Cookie-Banner auf dieser Seite gefunden. Falls Cookies gesetzt werden, ist ein Banner nach §25 TDDDG Pflicht.
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  )
+}

admin-compliance/app/sdk/agent/page.tsx

@@ -7,9 +7,10 @@ import { AnalysisHistory } from './_components/AnalysisHistory'
 import { FollowUpQuestions } from './_components/FollowUpQuestions'
 import { ScanResult } from './_components/ScanResult'
 import { DocCheckTab } from './_components/DocCheckTab'
+import { BannerCheckTab } from './_components/BannerCheckTab'
 
 type AnalysisMode = 'pre_launch' | 'post_launch'
-type AnalysisTab = 'quick' | 'scan' | 'doc-check'
+type AnalysisTab = 'quick' | 'scan' | 'doc-check' | 'banner-check'
 
 const MODES: { id: AnalysisMode; label: string; desc: string; icon: string }[] = [
   { id: 'pre_launch', label: 'Internes Dokument', desc: 'Vor Veroeffentlichung pruefen', icon: '📋' },
@@ -20,6 +21,7 @@ const TABS: { id: AnalysisTab; label: string; desc: string }[] = [
   { id: 'quick', label: 'Schnellanalyse', desc: 'Einzelne Seite klassifizieren + bewerten' },
   { id: 'scan', label: 'Website-Scan', desc: 'Mehrere Seiten scannen + Dienstleister abgleichen' },
   { id: 'doc-check', label: 'Dokumenten-Pruefung', desc: 'Einzelne Dokumente gezielt pruefen' },
+  { id: 'banner-check', label: 'Banner-Check', desc: 'Cookie-Banner auf DSGVO-Konformitaet testen' },
 ]
 
 export default function AgentPage() {
@@ -224,8 +226,11 @@ export default function AgentPage() {
       {/* Doc Check Tab — own component */}
       {tab === 'doc-check' && <DocCheckTab />}
 
+      {/* Banner Check Tab — own component */}
+      {tab === 'banner-check' && <BannerCheckTab />}
+
       {/* URL Input (quick + scan only) */}
-      {tab !== 'doc-check' && <form onSubmit={handleSubmit} className="flex gap-3">
+      {(tab === 'quick' || tab === 'scan') && <form onSubmit={handleSubmit} className="flex gap-3">
         <input type="url" value={url} onChange={e => setUrl(e.target.value)}
           placeholder={tab === 'scan' ? 'https://www.example.com/' : 'https://example.com/datenschutz'}
           className="flex-1 px-4 py-3 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-transparent text-sm"

backend-compliance/compliance/api/agent_doc_check_routes.py

@@ -92,6 +92,26 @@ class DocCheckStatusResponse(BaseModel):
     error: str = ""
 
 
+class BannerCheckRequest(BaseModel):
+    url: str
+
+
+@router.post("/banner-check")
+async def run_banner_check(req: BannerCheckRequest):
+    """Run cookie banner compliance check via consent-tester."""
+    try:
+        async with httpx.AsyncClient(timeout=120.0) as client:
+            resp = await client.post(
+                f"{CONSENT_TESTER_URL}/scan",
+                json={"url": req.url, "timeout_per_phase": 10},
+            )
+            if resp.status_code == 200:
+                return resp.json()
+            return {"error": f"Consent-Tester: HTTP {resp.status_code}"}
+    except Exception as e:
+        return {"error": str(e)[:200]}
+
+
 @router.post("/doc-check")
 async def start_doc_check(req: DocCheckRequest):
     """Start async multi-URL document check."""