feat: frontend AI tab — KI-Strategie, KI-Entwurf, Aehnliche Faelle

New "KI" tab on case detail page with three sub-panels: - KI-Strategie: one-click strategic analysis with next steps, risks, timeline - KI-Entwurf: document drafting with template selection, language, instructions - Aehnliche Faelle: UPC similar case search with relevance scores Components: CaseStrategy, DocumentDrafter, SimilarCaseFinder Types: StrategyRecommendation, DocumentDraft, SimilarCase, etc.
feat: AI-powered features — document drafting, case strategy, similar case finder (P2)
2026-03-30 11:26:01 +02:00 · 2026-03-30 11:25:52 +02:00 · 2026-03-30 11:25:41 +02:00
16 changed files with 1657 additions and 130 deletions
--- a/backend/cmd/server/main.go
+++ b/backend/cmd/server/main.go
@@ -5,6 +5,9 @@ import (
 	"net/http"
 	"os"

+	"github.com/jmoiron/sqlx"
+	_ "github.com/lib/pq"
+
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/auth"
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/config"
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/db"
@@ -31,6 +34,21 @@ func main() {

 	authMW := auth.NewMiddleware(cfg.SupabaseJWTSecret, database)

+	// Optional: connect to youpc.org database for similar case finder
+	var youpcDB *sqlx.DB
+	if cfg.YouPCDatabaseURL != "" {
+		youpcDB, err = sqlx.Connect("postgres", cfg.YouPCDatabaseURL)
+		if err != nil {
+			slog.Warn("failed to connect to youpc.org database — similar case finder disabled", "error", err)
+			youpcDB = nil
+		} else {
+			youpcDB.SetMaxOpenConns(5)
+			youpcDB.SetMaxIdleConns(2)
+			defer youpcDB.Close()
+			slog.Info("connected to youpc.org database for similar case finder")
+		}
+	}
+
 	// Start CalDAV sync service
 	calDAVSvc := services.NewCalDAVService(database)
 	calDAVSvc.Start()
@@ -41,7 +59,7 @@ func main() {
 	notifSvc.Start()
 	defer notifSvc.Stop()

-	handler := router.New(database, authMW, cfg, calDAVSvc, notifSvc)
+	handler := router.New(database, authMW, cfg, calDAVSvc, notifSvc, youpcDB)

 	slog.Info("starting KanzlAI API server", "port", cfg.Port)
 	if err := http.ListenAndServe(":"+cfg.Port, handler); err != nil {
--- a/backend/internal/auth/context.go
+++ b/backend/internal/auth/context.go
@@ -9,19 +9,11 @@ import (
 type contextKey string

 const (
-<<<<<<< HEAD
-	userIDKey    contextKey = "user_id"
-	tenantIDKey  contextKey = "tenant_id"
-	ipKey        contextKey = "ip_address"
-	userAgentKey contextKey = "user_agent"
-||||||| 82878df
-	userIDKey   contextKey = "user_id"
-	tenantIDKey contextKey = "tenant_id"
-=======
 	userIDKey    contextKey = "user_id"
 	tenantIDKey  contextKey = "tenant_id"
 	userRoleKey  contextKey = "user_role"
->>>>>>> mai/pike/p0-role-based
+	ipKey        contextKey = "ip_address"
+	userAgentKey contextKey = "user_agent"
 )

 func ContextWithUserID(ctx context.Context, userID uuid.UUID) context.Context {
@@ -41,7 +33,15 @@ func TenantFromContext(ctx context.Context) (uuid.UUID, bool) {
 	id, ok := ctx.Value(tenantIDKey).(uuid.UUID)
 	return id, ok
 }
-<<<<<<< HEAD
+
+func ContextWithUserRole(ctx context.Context, role string) context.Context {
+	return context.WithValue(ctx, userRoleKey, role)
+}
+
+func UserRoleFromContext(ctx context.Context) string {
+	role, _ := ctx.Value(userRoleKey).(string)
+	return role
+}

 func ContextWithRequestInfo(ctx context.Context, ip, userAgent string) context.Context {
 	ctx = context.WithValue(ctx, ipKey, ip)
@@ -62,15 +62,3 @@ func UserAgentFromContext(ctx context.Context) *string {
 	}
 	return nil
 }
-||||||| 82878df
-=======
-
-func ContextWithUserRole(ctx context.Context, role string) context.Context {
-	return context.WithValue(ctx, userRoleKey, role)
-}
-
-func UserRoleFromContext(ctx context.Context) string {
-	role, _ := ctx.Value(userRoleKey).(string)
-	return role
-}
->>>>>>> mai/pike/p0-role-based
--- a/backend/internal/auth/middleware.go
+++ b/backend/internal/auth/middleware.go
@@ -35,36 +35,6 @@ func (m *Middleware) RequireAuth(next http.Handler) http.Handler {
 		}

 		ctx := ContextWithUserID(r.Context(), userID)
-<<<<<<< HEAD
-		// Tenant resolution is handled by TenantResolver middleware for scoped routes.
-		// Tenant management routes handle their own access control.
-||||||| 82878df
-
-		// Resolve tenant and role from user_tenants
-		var membership struct {
-			TenantID uuid.UUID `db:"tenant_id"`
-			Role     string    `db:"role"`
-		}
-		err = m.db.GetContext(r.Context(), &membership,
-			"SELECT tenant_id, role FROM user_tenants WHERE user_id = $1 LIMIT 1", userID)
-		if err != nil {
-			http.Error(w, "no tenant found for user", http.StatusForbidden)
-			return
-		}
-		ctx = ContextWithTenantID(ctx, membership.TenantID)
-		ctx = ContextWithUserRole(ctx, membership.Role)
-
-=======
-
-		// Resolve tenant from user_tenants
-		var tenantID uuid.UUID
-		err = m.db.GetContext(r.Context(), &tenantID,
-			"SELECT tenant_id FROM user_tenants WHERE user_id = $1 LIMIT 1", userID)
-		if err != nil {
-			http.Error(w, "no tenant found for user", http.StatusForbidden)
-			return
-		}
-		ctx = ContextWithTenantID(ctx, tenantID)

 		// Capture IP and user-agent for audit logging
 		ip := r.Header.Get("X-Forwarded-For")
@@ -73,7 +43,8 @@ func (m *Middleware) RequireAuth(next http.Handler) http.Handler {
 		}
 		ctx = ContextWithRequestInfo(ctx, ip, r.UserAgent())

->>>>>>> mai/knuth/p0-audit-trail-append
+		// Tenant resolution is handled by TenantResolver middleware for scoped routes.
+		// Tenant management routes handle their own access control.
 		next.ServeHTTP(w, r.WithContext(ctx))
 	})
 }
--- a/backend/internal/auth/tenant_resolver.go
+++ b/backend/internal/auth/tenant_resolver.go
@@ -12,12 +12,8 @@ import (
 // Defined as an interface to avoid circular dependency with services.
 type TenantLookup interface {
 	FirstTenantForUser(ctx context.Context, userID uuid.UUID) (*uuid.UUID, error)
-<<<<<<< HEAD
 	VerifyAccess(ctx context.Context, userID, tenantID uuid.UUID) (bool, error)
-||||||| 82878df
-=======
 	GetUserRole(ctx context.Context, userID, tenantID uuid.UUID) (string, error)
->>>>>>> mai/pike/p0-role-based
 }

 // TenantResolver is middleware that resolves the tenant from X-Tenant-ID header
@@ -46,35 +42,20 @@ func (tr *TenantResolver) Resolve(next http.Handler) http.Handler {
 				http.Error(w, `{"error":"invalid X-Tenant-ID"}`, http.StatusBadRequest)
 				return
 			}
-<<<<<<< HEAD

-			// Verify user has access to this tenant
-			hasAccess, err := tr.lookup.VerifyAccess(r.Context(), userID, parsed)
+			// Verify user has access and get their role
+			role, err := tr.lookup.GetUserRole(r.Context(), userID, parsed)
 			if err != nil {
 				slog.Error("tenant access check failed", "error", err, "user_id", userID, "tenant_id", parsed)
 				http.Error(w, `{"error":"internal error"}`, http.StatusInternalServerError)
 				return
 			}
-			if !hasAccess {
+			if role == "" {
 				http.Error(w, `{"error":"no access to tenant"}`, http.StatusForbidden)
 				return
 			}

-||||||| 82878df
-=======
-			// Verify user has access and get their role
-			role, err := tr.lookup.GetUserRole(r.Context(), userID, parsed)
-			if err != nil {
-				http.Error(w, "error checking tenant access", http.StatusInternalServerError)
-				return
-			}
-			if role == "" {
-				http.Error(w, "no access to this tenant", http.StatusForbidden)
-				return
-			}
->>>>>>> mai/pike/p0-role-based
 			tenantID = parsed
-			// Override the role from middleware with the correct one for this tenant
 			r = r.WithContext(ContextWithUserRole(r.Context(), role))
 		} else {
 			// Default to user's first tenant (role already set by middleware)
--- a/backend/internal/auth/tenant_resolver_test.go
+++ b/backend/internal/auth/tenant_resolver_test.go
@@ -10,49 +10,35 @@ import (
 )

 type mockTenantLookup struct {
-<<<<<<< HEAD
 	tenantID  *uuid.UUID
 	err       error
 	hasAccess bool
 	accessErr error
-||||||| 82878df
-	tenantID *uuid.UUID
-	err      error
-=======
-	tenantID *uuid.UUID
 	role      string
-	err      error
->>>>>>> mai/pike/p0-role-based
+	noAccess  bool // when true, GetUserRole returns ""
 }

 func (m *mockTenantLookup) FirstTenantForUser(ctx context.Context, userID uuid.UUID) (*uuid.UUID, error) {
 	return m.tenantID, m.err
 }

-<<<<<<< HEAD
 func (m *mockTenantLookup) VerifyAccess(ctx context.Context, userID, tenantID uuid.UUID) (bool, error) {
 	return m.hasAccess, m.accessErr
 }

-||||||| 82878df
-=======
 func (m *mockTenantLookup) GetUserRole(ctx context.Context, userID, tenantID uuid.UUID) (string, error) {
+	if m.noAccess {
+		return "", m.err
+	}
 	if m.role != "" {
 		return m.role, m.err
 	}
 	return "associate", m.err
 }

->>>>>>> mai/pike/p0-role-based
 func TestTenantResolver_FromHeader(t *testing.T) {
 	tenantID := uuid.New()
-<<<<<<< HEAD
-	tr := NewTenantResolver(&mockTenantLookup{hasAccess: true})
-||||||| 82878df
-	tr := NewTenantResolver(&mockTenantLookup{})
-=======
-	tr := NewTenantResolver(&mockTenantLookup{role: "partner"})
->>>>>>> mai/pike/p0-role-based
+	tr := NewTenantResolver(&mockTenantLookup{role: "partner", hasAccess: true})

 	var gotTenantID uuid.UUID
 	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@@ -81,7 +67,7 @@ func TestTenantResolver_FromHeader(t *testing.T) {

 func TestTenantResolver_FromHeader_NoAccess(t *testing.T) {
 	tenantID := uuid.New()
-	tr := NewTenantResolver(&mockTenantLookup{hasAccess: false})
+	tr := NewTenantResolver(&mockTenantLookup{noAccess: true})

 	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		t.Fatal("next should not be called")
--- a/backend/internal/config/config.go
+++ b/backend/internal/config/config.go
@@ -14,6 +14,7 @@ type Config struct {
 	SupabaseJWTSecret string
 	AnthropicAPIKey   string
 	FrontendOrigin    string
+	YouPCDatabaseURL  string // read-only connection to youpc.org Supabase for similar case finder
 }

 func Load() (*Config, error) {
@@ -26,6 +27,7 @@ func Load() (*Config, error) {
 		SupabaseJWTSecret: os.Getenv("SUPABASE_JWT_SECRET"),
 		AnthropicAPIKey:  os.Getenv("ANTHROPIC_API_KEY"),
 		FrontendOrigin:   getEnv("FRONTEND_ORIGIN", "https://kanzlai.msbls.de"),
+		YouPCDatabaseURL: os.Getenv("YOUPC_DATABASE_URL"),
 	}

 	if cfg.DatabaseURL == "" {
--- a/backend/internal/handlers/ai.go
+++ b/backend/internal/handlers/ai.go
@@ -5,6 +5,8 @@ import (
 	"io"
 	"net/http"

+	"github.com/google/uuid"
+
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/auth"
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
 )
@@ -115,3 +117,139 @@ func (h *AIHandler) SummarizeCase(w http.ResponseWriter, r *http.Request) {
 		"summary": summary,
 	})
 }
+
+// DraftDocument handles POST /api/ai/draft-document
+// Accepts JSON {"case_id": "uuid", "template_type": "string", "instructions": "string", "language": "de|en|fr"}.
+func (h *AIHandler) DraftDocument(w http.ResponseWriter, r *http.Request) {
+	tenantID, ok := auth.TenantFromContext(r.Context())
+	if !ok {
+		writeError(w, http.StatusForbidden, "missing tenant")
+		return
+	}
+
+	var body struct {
+		CaseID       string `json:"case_id"`
+		TemplateType string `json:"template_type"`
+		Instructions string `json:"instructions"`
+		Language     string `json:"language"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+
+	if body.CaseID == "" {
+		writeError(w, http.StatusBadRequest, "case_id is required")
+		return
+	}
+	if body.TemplateType == "" {
+		writeError(w, http.StatusBadRequest, "template_type is required")
+		return
+	}
+
+	caseID, err := parseUUID(body.CaseID)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "invalid case_id")
+		return
+	}
+
+	if len(body.Instructions) > maxDescriptionLen {
+		writeError(w, http.StatusBadRequest, "instructions exceeds maximum length")
+		return
+	}
+
+	draft, err := h.ai.DraftDocument(r.Context(), tenantID, caseID, body.TemplateType, body.Instructions, body.Language)
+	if err != nil {
+		internalError(w, "AI document drafting failed", err)
+		return
+	}
+
+	writeJSON(w, http.StatusOK, draft)
+}
+
+// CaseStrategy handles POST /api/ai/case-strategy
+// Accepts JSON {"case_id": "uuid"}.
+func (h *AIHandler) CaseStrategy(w http.ResponseWriter, r *http.Request) {
+	tenantID, ok := auth.TenantFromContext(r.Context())
+	if !ok {
+		writeError(w, http.StatusForbidden, "missing tenant")
+		return
+	}
+
+	var body struct {
+		CaseID string `json:"case_id"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+
+	if body.CaseID == "" {
+		writeError(w, http.StatusBadRequest, "case_id is required")
+		return
+	}
+
+	caseID, err := parseUUID(body.CaseID)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "invalid case_id")
+		return
+	}
+
+	strategy, err := h.ai.CaseStrategy(r.Context(), tenantID, caseID)
+	if err != nil {
+		internalError(w, "AI case strategy analysis failed", err)
+		return
+	}
+
+	writeJSON(w, http.StatusOK, strategy)
+}
+
+// SimilarCases handles POST /api/ai/similar-cases
+// Accepts JSON {"case_id": "uuid", "description": "string"}.
+func (h *AIHandler) SimilarCases(w http.ResponseWriter, r *http.Request) {
+	tenantID, ok := auth.TenantFromContext(r.Context())
+	if !ok {
+		writeError(w, http.StatusForbidden, "missing tenant")
+		return
+	}
+
+	var body struct {
+		CaseID      string `json:"case_id"`
+		Description string `json:"description"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+
+	if body.CaseID == "" && body.Description == "" {
+		writeError(w, http.StatusBadRequest, "either case_id or description is required")
+		return
+	}
+
+	if len(body.Description) > maxDescriptionLen {
+		writeError(w, http.StatusBadRequest, "description exceeds maximum length")
+		return
+	}
+
+	var caseID uuid.UUID
+	if body.CaseID != "" {
+		var err error
+		caseID, err = parseUUID(body.CaseID)
+		if err != nil {
+			writeError(w, http.StatusBadRequest, "invalid case_id")
+			return
+		}
+	}
+
+	cases, err := h.ai.FindSimilarCases(r.Context(), tenantID, caseID, body.Description)
+	if err != nil {
+		internalError(w, "AI similar case search failed", err)
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"cases": cases,
+		"count": len(cases),
+	})
+}
--- a/backend/internal/handlers/deadlines.go
+++ b/backend/internal/handlers/deadlines.go
@@ -198,18 +198,8 @@ func (h *DeadlineHandlers) Delete(w http.ResponseWriter, r *http.Request) {
 		return
 	}

-<<<<<<< HEAD
-	if err := h.deadlines.Delete(tenantID, deadlineID); err != nil {
+	if err := h.deadlines.Delete(r.Context(), tenantID, deadlineID); err != nil {
 		writeError(w, http.StatusNotFound, "deadline not found")
-||||||| 82878df
-	err = h.deadlines.Delete(tenantID, deadlineID)
-	if err != nil {
-		writeError(w, http.StatusNotFound, err.Error())
-=======
-	err = h.deadlines.Delete(r.Context(), tenantID, deadlineID)
-	if err != nil {
-		writeError(w, http.StatusNotFound, err.Error())
->>>>>>> mai/knuth/p0-audit-trail-append
 		return
 	}

--- a/backend/internal/router/router.go
+++ b/backend/internal/router/router.go
@@ -15,7 +15,7 @@ import (
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
 )

-func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *services.CalDAVService, notifSvc *services.NotificationService) http.Handler {
+func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *services.CalDAVService, notifSvc *services.NotificationService, youpcDB ...*sqlx.DB) http.Handler {
 	mux := http.NewServeMux()

 	// Services
@@ -29,19 +29,17 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 	deadlineRuleSvc := services.NewDeadlineRuleService(db)
 	calculator := services.NewDeadlineCalculator(holidaySvc)
 	storageCli := services.NewStorageClient(cfg.SupabaseURL, cfg.SupabaseServiceKey)
-<<<<<<< HEAD
 	documentSvc := services.NewDocumentService(db, storageCli, auditSvc)
-||||||| 82878df
-	documentSvc := services.NewDocumentService(db, storageCli)
-=======
-	documentSvc := services.NewDocumentService(db, storageCli)
 	assignmentSvc := services.NewCaseAssignmentService(db)
->>>>>>> mai/pike/p0-role-based

 	// AI service (optional — only if API key is configured)
 	var aiH *handlers.AIHandler
 	if cfg.AnthropicAPIKey != "" {
-		aiSvc := services.NewAIService(cfg.AnthropicAPIKey, db)
+		var ydb *sqlx.DB
+		if len(youpcDB) > 0 {
+			ydb = youpcDB[0]
+		}
+		aiSvc := services.NewAIService(cfg.AnthropicAPIKey, db, ydb)
 		aiH = handlers.NewAIHandler(aiSvc)
 	}

@@ -162,16 +160,10 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 	// Dashboard — all can view
 	scoped.HandleFunc("GET /api/dashboard", dashboardH.Get)

-<<<<<<< HEAD
 	// Audit log
 	scoped.HandleFunc("GET /api/audit-log", auditH.List)

-	// Documents
-||||||| 82878df
-	// Documents
-=======
 	// Documents — all can upload, delete checked in handler (own vs all)
->>>>>>> mai/pike/p0-role-based
 	scoped.HandleFunc("GET /api/cases/{id}/documents", docH.ListByCase)
 	scoped.HandleFunc("POST /api/cases/{id}/documents", perm(auth.PermUploadDocuments, docH.Upload))
 	scoped.HandleFunc("GET /api/documents/{docId}", docH.Download)
@@ -183,9 +175,11 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 		aiLimiter := middleware.NewTokenBucket(5.0/60.0, 10)
 		scoped.HandleFunc("POST /api/ai/extract-deadlines", perm(auth.PermAIExtraction, aiLimiter.LimitFunc(aiH.ExtractDeadlines)))
 		scoped.HandleFunc("POST /api/ai/summarize-case", perm(auth.PermAIExtraction, aiLimiter.LimitFunc(aiH.SummarizeCase)))
+		scoped.HandleFunc("POST /api/ai/draft-document", perm(auth.PermAIExtraction, aiLimiter.LimitFunc(aiH.DraftDocument)))
+		scoped.HandleFunc("POST /api/ai/case-strategy", perm(auth.PermAIExtraction, aiLimiter.LimitFunc(aiH.CaseStrategy)))
+		scoped.HandleFunc("POST /api/ai/similar-cases", perm(auth.PermAIExtraction, aiLimiter.LimitFunc(aiH.SimilarCases)))
 	}

-<<<<<<< HEAD
 	// Notifications
 	if notifH != nil {
 		scoped.HandleFunc("GET /api/notifications", notifH.List)
@@ -196,12 +190,7 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 		scoped.HandleFunc("PUT /api/notification-preferences", notifH.UpdatePreferences)
 	}

-	// CalDAV sync endpoints
-||||||| 82878df
-	// CalDAV sync endpoints
-=======
 	// CalDAV sync endpoints — settings permission required
->>>>>>> mai/pike/p0-role-based
 	if calDAVSvc != nil {
 		calDAVH := handlers.NewCalDAVHandler(calDAVSvc)
 		scoped.HandleFunc("POST /api/caldav/sync", perm(auth.PermManageSettings, calDAVH.TriggerSync))
--- a/backend/internal/services/ai_service.go
+++ b/backend/internal/services/ai_service.go
@@ -5,6 +5,7 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
+	"strings"
 	"time"

 	"github.com/anthropics/anthropic-sdk-go"
@@ -18,11 +19,12 @@ import (
 type AIService struct {
 	client anthropic.Client
 	db     *sqlx.DB
+	youpcDB *sqlx.DB // read-only connection to youpc.org for similar case finder (may be nil)
 }

-func NewAIService(apiKey string, db *sqlx.DB) *AIService {
+func NewAIService(apiKey string, db *sqlx.DB, youpcDB *sqlx.DB) *AIService {
 	client := anthropic.NewClient(option.WithAPIKey(apiKey))
-	return &AIService{client: client, db: db}
+	return &AIService{client: client, db: db, youpcDB: youpcDB}
 }

 // ExtractedDeadline represents a deadline extracted by AI from a document.
@@ -281,3 +283,726 @@ func (s *AIService) SummarizeCase(ctx context.Context, tenantID, caseID uuid.UUI

 	return summary, nil
 }
+
+// --- Document Drafting ---
+
+// DocumentDraft represents an AI-generated document draft.
+type DocumentDraft struct {
+	Title    string `json:"title"`
+	Content  string `json:"content"`
+	Language string `json:"language"`
+}
+
+// templateDescriptions maps template type IDs to descriptions for Claude.
+var templateDescriptions = map[string]string{
+	"klageschrift":      "Klageschrift (Statement of Claim) — formal complaint initiating legal proceedings",
+	"klageerwiderung":   "Klageerwiderung (Statement of Defence) — formal response to a statement of claim",
+	"abmahnung":         "Abmahnung (Cease and Desist Letter) — formal warning letter demanding cessation of an activity",
+	"schriftsatz":       "Schriftsatz (Legal Brief) — formal legal submission to the court",
+	"berufung":          "Berufungsschrift (Appeal Brief) — formal appeal against a court decision",
+	"antrag":            "Antrag (Motion/Application) — formal application or motion to the court",
+	"stellungnahme":     "Stellungnahme (Statement/Position Paper) — formal response or position paper",
+	"gutachten":         "Gutachten (Legal Opinion/Expert Report) — detailed legal analysis or opinion",
+	"vertrag":           "Vertrag (Contract/Agreement) — legal contract or agreement between parties",
+	"vollmacht":         "Vollmacht (Power of Attorney) — formal authorization document",
+	"upc_claim":         "UPC Statement of Claim — claim filed at the Unified Patent Court",
+	"upc_defence":       "UPC Statement of Defence — defence filed at the Unified Patent Court",
+	"upc_counterclaim":  "UPC Counterclaim for Revocation — counterclaim for patent revocation at the UPC",
+	"upc_injunction":    "UPC Application for Provisional Measures — application for injunctive relief at the UPC",
+}
+
+const draftDocumentSystemPrompt = `You are an expert legal document drafter for German and UPC (Unified Patent Court) patent litigation.
+
+You draft professional legal documents in the requested language, following proper legal formatting conventions.
+
+Guidelines:
+- Use proper legal structure with numbered sections and paragraphs
+- Include standard legal formalities (headers, salutations, signatures block)
+- Reference relevant legal provisions (BGB, ZPO, UPC Rules of Procedure, etc.)
+- Use precise legal terminology appropriate for the jurisdiction
+- Include placeholders in [BRACKETS] for information that needs to be filled in
+- Base the content on the provided case data and instructions
+- Output the document as clean text with proper formatting`
+
+// DraftDocument generates an AI-drafted legal document based on case data and a template type.
+func (s *AIService) DraftDocument(ctx context.Context, tenantID, caseID uuid.UUID, templateType, instructions, language string) (*DocumentDraft, error) {
+	if language == "" {
+		language = "de"
+	}
+
+	langLabel := "German"
+	if language == "en" {
+		langLabel = "English"
+	} else if language == "fr" {
+		langLabel = "French"
+	}
+
+	// Load case data
+	var c models.Case
+	if err := s.db.GetContext(ctx, &c,
+		"SELECT * FROM cases WHERE id = $1 AND tenant_id = $2", caseID, tenantID); err != nil {
+		return nil, fmt.Errorf("loading case: %w", err)
+	}
+
+	// Load parties
+	var parties []models.Party
+	_ = s.db.SelectContext(ctx, &parties,
+		"SELECT * FROM parties WHERE case_id = $1 AND tenant_id = $2", caseID, tenantID)
+
+	// Load recent events
+	var events []models.CaseEvent
+	_ = s.db.SelectContext(ctx, &events,
+		"SELECT * FROM case_events WHERE case_id = $1 AND tenant_id = $2 ORDER BY created_at DESC LIMIT 15",
+		caseID, tenantID)
+
+	// Load active deadlines
+	var deadlines []models.Deadline
+	_ = s.db.SelectContext(ctx, &deadlines,
+		"SELECT * FROM deadlines WHERE case_id = $1 AND tenant_id = $2 AND status = 'active' ORDER BY due_date ASC LIMIT 10",
+		caseID, tenantID)
+
+	// Load documents metadata for context
+	var documents []models.Document
+	_ = s.db.SelectContext(ctx, &documents,
+		"SELECT id, title, doc_type, created_at FROM documents WHERE case_id = $1 AND tenant_id = $2 ORDER BY created_at DESC LIMIT 10",
+		caseID, tenantID)
+
+	// Build context
+	var b strings.Builder
+	b.WriteString(fmt.Sprintf("Case: %s — %s\nStatus: %s\n", c.CaseNumber, c.Title, c.Status))
+	if c.Court != nil {
+		b.WriteString(fmt.Sprintf("Court: %s\n", *c.Court))
+	}
+	if c.CourtRef != nil {
+		b.WriteString(fmt.Sprintf("Court Reference: %s\n", *c.CourtRef))
+	}
+	if c.CaseType != nil {
+		b.WriteString(fmt.Sprintf("Type: %s\n", *c.CaseType))
+	}
+
+	if len(parties) > 0 {
+		b.WriteString("\nParties:\n")
+		for _, p := range parties {
+			role := "unknown role"
+			if p.Role != nil {
+				role = *p.Role
+			}
+			b.WriteString(fmt.Sprintf("- %s (%s)", p.Name, role))
+			if p.Representative != nil {
+				b.WriteString(fmt.Sprintf(" — represented by %s", *p.Representative))
+			}
+			b.WriteString("\n")
+		}
+	}
+
+	if len(events) > 0 {
+		b.WriteString("\nRecent Events:\n")
+		for _, e := range events {
+			b.WriteString(fmt.Sprintf("- [%s] %s", e.CreatedAt.Format("2006-01-02"), e.Title))
+			if e.Description != nil {
+				b.WriteString(fmt.Sprintf(": %s", *e.Description))
+			}
+			b.WriteString("\n")
+		}
+	}
+
+	if len(deadlines) > 0 {
+		b.WriteString("\nUpcoming Deadlines:\n")
+		for _, d := range deadlines {
+			b.WriteString(fmt.Sprintf("- %s: due %s\n", d.Title, d.DueDate))
+		}
+	}
+
+	templateDesc, ok := templateDescriptions[templateType]
+	if !ok {
+		templateDesc = templateType
+	}
+
+	prompt := fmt.Sprintf(`Draft a %s for this case in %s.
+
+Document type: %s
+
+Case context:
+%s
+Additional instructions from the lawyer:
+%s
+
+Generate the complete document now.`, templateDesc, langLabel, templateDesc, b.String(), instructions)
+
+	msg, err := s.client.Messages.New(ctx, anthropic.MessageNewParams{
+		Model:     anthropic.ModelClaudeSonnet4_20250514,
+		MaxTokens: 8192,
+		System: []anthropic.TextBlockParam{
+			{Text: draftDocumentSystemPrompt},
+		},
+		Messages: []anthropic.MessageParam{
+			anthropic.NewUserMessage(anthropic.NewTextBlock(prompt)),
+		},
+	})
+	if err != nil {
+		return nil, fmt.Errorf("claude API call: %w", err)
+	}
+
+	var content string
+	for _, block := range msg.Content {
+		if block.Type == "text" {
+			content += block.Text
+		}
+	}
+	if content == "" {
+		return nil, fmt.Errorf("empty response from Claude")
+	}
+
+	title := fmt.Sprintf("%s — %s", templateDesc, c.CaseNumber)
+	return &DocumentDraft{
+		Title:    title,
+		Content:  content,
+		Language: language,
+	}, nil
+}
+
+// --- Case Strategy ---
+
+// StrategyRecommendation represents an AI-generated case strategy analysis.
+type StrategyRecommendation struct {
+	Summary        string           `json:"summary"`
+	NextSteps      []StrategyStep   `json:"next_steps"`
+	RiskAssessment []RiskItem       `json:"risk_assessment"`
+	Timeline       []TimelineItem   `json:"timeline"`
+}
+
+type StrategyStep struct {
+	Priority    string `json:"priority"` // high, medium, low
+	Action      string `json:"action"`
+	Reasoning   string `json:"reasoning"`
+	Deadline    string `json:"deadline,omitempty"`
+}
+
+type RiskItem struct {
+	Level       string `json:"level"` // high, medium, low
+	Risk        string `json:"risk"`
+	Mitigation  string `json:"mitigation"`
+}
+
+type TimelineItem struct {
+	Date        string `json:"date"`
+	Event       string `json:"event"`
+	Importance  string `json:"importance"` // critical, important, routine
+}
+
+type strategyToolInput struct {
+	Summary        string         `json:"summary"`
+	NextSteps      []StrategyStep `json:"next_steps"`
+	RiskAssessment []RiskItem     `json:"risk_assessment"`
+	Timeline       []TimelineItem `json:"timeline"`
+}
+
+var caseStrategyTool = anthropic.ToolParam{
+	Name:        "case_strategy",
+	Description: anthropic.String("Provide strategic case analysis with next steps, risk assessment, and timeline optimization."),
+	InputSchema: anthropic.ToolInputSchemaParam{
+		Properties: map[string]any{
+			"summary": map[string]any{
+				"type":        "string",
+				"description": "Executive summary of the case situation and strategic outlook (2-4 sentences)",
+			},
+			"next_steps": map[string]any{
+				"type":        "array",
+				"description": "Recommended next actions in priority order",
+				"items": map[string]any{
+					"type": "object",
+					"properties": map[string]any{
+						"priority": map[string]any{
+							"type": "string",
+							"enum": []string{"high", "medium", "low"},
+						},
+						"action": map[string]any{
+							"type":        "string",
+							"description": "Specific recommended action",
+						},
+						"reasoning": map[string]any{
+							"type":        "string",
+							"description": "Why this action is recommended",
+						},
+						"deadline": map[string]any{
+							"type":        "string",
+							"description": "Suggested deadline in YYYY-MM-DD format, if applicable",
+						},
+					},
+					"required": []string{"priority", "action", "reasoning"},
+				},
+			},
+			"risk_assessment": map[string]any{
+				"type":        "array",
+				"description": "Key risks and mitigation strategies",
+				"items": map[string]any{
+					"type": "object",
+					"properties": map[string]any{
+						"level": map[string]any{
+							"type": "string",
+							"enum": []string{"high", "medium", "low"},
+						},
+						"risk": map[string]any{
+							"type":        "string",
+							"description": "Description of the risk",
+						},
+						"mitigation": map[string]any{
+							"type":        "string",
+							"description": "Recommended mitigation strategy",
+						},
+					},
+					"required": []string{"level", "risk", "mitigation"},
+				},
+			},
+			"timeline": map[string]any{
+				"type":        "array",
+				"description": "Optimized timeline of upcoming milestones and events",
+				"items": map[string]any{
+					"type": "object",
+					"properties": map[string]any{
+						"date": map[string]any{
+							"type":        "string",
+							"description": "Date in YYYY-MM-DD format",
+						},
+						"event": map[string]any{
+							"type":        "string",
+							"description": "Description of the milestone or event",
+						},
+						"importance": map[string]any{
+							"type": "string",
+							"enum": []string{"critical", "important", "routine"},
+						},
+					},
+					"required": []string{"date", "event", "importance"},
+				},
+			},
+		},
+		Required: []string{"summary", "next_steps", "risk_assessment", "timeline"},
+	},
+}
+
+const caseStrategySystemPrompt = `You are a senior litigation strategist specializing in German law and UPC (Unified Patent Court) patent proceedings.
+
+Analyze the case thoroughly and provide:
+1. An executive summary of the current strategic position
+2. Prioritized next steps with clear reasoning
+3. Risk assessment with mitigation strategies
+4. An optimized timeline of upcoming milestones
+
+Consider:
+- Procedural deadlines and their implications
+- Strength of the parties' positions based on available information
+- Potential settlement opportunities
+- Cost-efficiency of different strategic approaches
+- UPC-specific procedural peculiarities if applicable (bifurcation, preliminary injunctions, etc.)
+
+Be practical and actionable. Avoid generic advice — tailor recommendations to the specific case data provided.`
+
+// CaseStrategy analyzes a case and returns strategic recommendations.
+func (s *AIService) CaseStrategy(ctx context.Context, tenantID, caseID uuid.UUID) (*StrategyRecommendation, error) {
+	// Load case
+	var c models.Case
+	if err := s.db.GetContext(ctx, &c,
+		"SELECT * FROM cases WHERE id = $1 AND tenant_id = $2", caseID, tenantID); err != nil {
+		return nil, fmt.Errorf("loading case: %w", err)
+	}
+
+	// Load parties
+	var parties []models.Party
+	_ = s.db.SelectContext(ctx, &parties,
+		"SELECT * FROM parties WHERE case_id = $1 AND tenant_id = $2", caseID, tenantID)
+
+	// Load all events
+	var events []models.CaseEvent
+	_ = s.db.SelectContext(ctx, &events,
+		"SELECT * FROM case_events WHERE case_id = $1 AND tenant_id = $2 ORDER BY created_at DESC LIMIT 25",
+		caseID, tenantID)
+
+	// Load all deadlines (active + completed for context)
+	var deadlines []models.Deadline
+	_ = s.db.SelectContext(ctx, &deadlines,
+		"SELECT * FROM deadlines WHERE case_id = $1 AND tenant_id = $2 ORDER BY due_date ASC LIMIT 20",
+		caseID, tenantID)
+
+	// Load documents metadata
+	var documents []models.Document
+	_ = s.db.SelectContext(ctx, &documents,
+		"SELECT id, title, doc_type, created_at FROM documents WHERE case_id = $1 AND tenant_id = $2 ORDER BY created_at DESC LIMIT 15",
+		caseID, tenantID)
+
+	// Build comprehensive context
+	var b strings.Builder
+	b.WriteString(fmt.Sprintf("Case: %s — %s\nStatus: %s\n", c.CaseNumber, c.Title, c.Status))
+	if c.Court != nil {
+		b.WriteString(fmt.Sprintf("Court: %s\n", *c.Court))
+	}
+	if c.CourtRef != nil {
+		b.WriteString(fmt.Sprintf("Court Reference: %s\n", *c.CourtRef))
+	}
+	if c.CaseType != nil {
+		b.WriteString(fmt.Sprintf("Type: %s\n", *c.CaseType))
+	}
+
+	if len(parties) > 0 {
+		b.WriteString("\nParties:\n")
+		for _, p := range parties {
+			role := "unknown"
+			if p.Role != nil {
+				role = *p.Role
+			}
+			b.WriteString(fmt.Sprintf("- %s (%s)", p.Name, role))
+			if p.Representative != nil {
+				b.WriteString(fmt.Sprintf(" — represented by %s", *p.Representative))
+			}
+			b.WriteString("\n")
+		}
+	}
+
+	if len(events) > 0 {
+		b.WriteString("\nCase Events (chronological):\n")
+		for _, e := range events {
+			b.WriteString(fmt.Sprintf("- [%s] %s", e.CreatedAt.Format("2006-01-02"), e.Title))
+			if e.Description != nil {
+				b.WriteString(fmt.Sprintf(": %s", *e.Description))
+			}
+			b.WriteString("\n")
+		}
+	}
+
+	if len(deadlines) > 0 {
+		b.WriteString("\nDeadlines:\n")
+		for _, d := range deadlines {
+			b.WriteString(fmt.Sprintf("- %s: due %s (status: %s)\n", d.Title, d.DueDate, d.Status))
+		}
+	}
+
+	if len(documents) > 0 {
+		b.WriteString("\nDocuments on file:\n")
+		for _, d := range documents {
+			docType := ""
+			if d.DocType != nil {
+				docType = fmt.Sprintf(" [%s]", *d.DocType)
+			}
+			b.WriteString(fmt.Sprintf("- %s%s (%s)\n", d.Title, docType, d.CreatedAt.Format("2006-01-02")))
+		}
+	}
+
+	msg, err := s.client.Messages.New(ctx, anthropic.MessageNewParams{
+		Model:     anthropic.ModelClaudeOpus4_6,
+		MaxTokens: 4096,
+		System: []anthropic.TextBlockParam{
+			{Text: caseStrategySystemPrompt},
+		},
+		Messages: []anthropic.MessageParam{
+			anthropic.NewUserMessage(anthropic.NewTextBlock("Analyze this case and provide strategic recommendations:\n\n" + b.String())),
+		},
+		Tools: []anthropic.ToolUnionParam{
+			{OfTool: &caseStrategyTool},
+		},
+		ToolChoice: anthropic.ToolChoiceParamOfTool("case_strategy"),
+	})
+	if err != nil {
+		return nil, fmt.Errorf("claude API call: %w", err)
+	}
+
+	for _, block := range msg.Content {
+		if block.Type == "tool_use" && block.Name == "case_strategy" {
+			var input strategyToolInput
+			if err := json.Unmarshal(block.Input, &input); err != nil {
+				return nil, fmt.Errorf("parsing strategy output: %w", err)
+			}
+			result := &StrategyRecommendation{
+				Summary:        input.Summary,
+				NextSteps:      input.NextSteps,
+				RiskAssessment: input.RiskAssessment,
+				Timeline:       input.Timeline,
+			}
+			// Cache in database
+			strategyJSON, _ := json.Marshal(result)
+			_, _ = s.db.ExecContext(ctx,
+				"UPDATE cases SET ai_summary = $1, updated_at = $2 WHERE id = $3 AND tenant_id = $4",
+				string(strategyJSON), time.Now(), caseID, tenantID)
+			return result, nil
+		}
+	}
+
+	return nil, fmt.Errorf("no tool_use block in response")
+}
+
+// --- Similar Case Finder ---
+
+// SimilarCase represents a UPC case found to be similar.
+type SimilarCase struct {
+	CaseNumber   string  `json:"case_number"`
+	Title        string  `json:"title"`
+	Court        string  `json:"court"`
+	Date         string  `json:"date"`
+	Relevance    float64 `json:"relevance"`    // 0.0-1.0
+	Explanation  string  `json:"explanation"`   // why this case is similar
+	KeyHoldings  string  `json:"key_holdings"`  // relevant holdings
+	URL          string  `json:"url,omitempty"` // link to youpc.org
+}
+
+// youpcCase represents a case from the youpc.org database.
+type youpcCase struct {
+	ID            string  `db:"id" json:"id"`
+	CaseNumber    *string `db:"case_number" json:"case_number"`
+	Title         *string `db:"title" json:"title"`
+	Court         *string `db:"court" json:"court"`
+	DecisionDate  *string `db:"decision_date" json:"decision_date"`
+	CaseType      *string `db:"case_type" json:"case_type"`
+	Outcome       *string `db:"outcome" json:"outcome"`
+	PatentNumbers *string `db:"patent_numbers" json:"patent_numbers"`
+	Summary       *string `db:"summary" json:"summary"`
+	Claimant      *string `db:"claimant" json:"claimant"`
+	Defendant     *string `db:"defendant" json:"defendant"`
+}
+
+type similarCaseToolInput struct {
+	Cases []struct {
+		CaseID      string  `json:"case_id"`
+		Relevance   float64 `json:"relevance"`
+		Explanation string  `json:"explanation"`
+		KeyHoldings string  `json:"key_holdings"`
+	} `json:"cases"`
+}
+
+var similarCaseTool = anthropic.ToolParam{
+	Name:        "rank_similar_cases",
+	Description: anthropic.String("Rank the provided UPC cases by relevance to the query case and explain why each is similar."),
+	InputSchema: anthropic.ToolInputSchemaParam{
+		Properties: map[string]any{
+			"cases": map[string]any{
+				"type":        "array",
+				"description": "UPC cases ranked by relevance (most relevant first)",
+				"items": map[string]any{
+					"type": "object",
+					"properties": map[string]any{
+						"case_id": map[string]any{
+							"type":        "string",
+							"description": "The ID of the UPC case from the provided list",
+						},
+						"relevance": map[string]any{
+							"type":        "number",
+							"minimum":     0,
+							"maximum":     1,
+							"description": "Relevance score from 0.0 to 1.0",
+						},
+						"explanation": map[string]any{
+							"type":        "string",
+							"description": "Why this case is relevant — what legal issues, parties, patents, or procedural aspects are similar",
+						},
+						"key_holdings": map[string]any{
+							"type":        "string",
+							"description": "Key holdings or legal principles from this case that are relevant",
+						},
+					},
+					"required": []string{"case_id", "relevance", "explanation", "key_holdings"},
+				},
+			},
+		},
+		Required: []string{"cases"},
+	},
+}
+
+const similarCaseSystemPrompt = `You are a UPC (Unified Patent Court) case law expert.
+
+Given a case description and a list of UPC cases from the database, rank the cases by relevance and explain why each one is similar or relevant.
+
+Consider:
+- Similar patents or technology areas
+- Same parties or representatives
+- Similar legal issues (infringement, validity, injunctions, etc.)
+- Similar procedural situations
+- Relevant legal principles that could apply
+
+Only include cases that are genuinely relevant (relevance > 0.3). Order by relevance descending.`
+
+// FindSimilarCases searches the youpc.org database for similar UPC cases.
+func (s *AIService) FindSimilarCases(ctx context.Context, tenantID, caseID uuid.UUID, description string) ([]SimilarCase, error) {
+	if s.youpcDB == nil {
+		return nil, fmt.Errorf("youpc.org database not configured")
+	}
+
+	// Build query context from the case (if provided) or description
+	var queryText string
+	if caseID != uuid.Nil {
+		var c models.Case
+		if err := s.db.GetContext(ctx, &c,
+			"SELECT * FROM cases WHERE id = $1 AND tenant_id = $2", caseID, tenantID); err != nil {
+			return nil, fmt.Errorf("loading case: %w", err)
+		}
+
+		var parties []models.Party
+		_ = s.db.SelectContext(ctx, &parties,
+			"SELECT * FROM parties WHERE case_id = $1 AND tenant_id = $2", caseID, tenantID)
+
+		var b strings.Builder
+		b.WriteString(fmt.Sprintf("Case: %s — %s\n", c.CaseNumber, c.Title))
+		if c.CaseType != nil {
+			b.WriteString(fmt.Sprintf("Type: %s\n", *c.CaseType))
+		}
+		if c.Court != nil {
+			b.WriteString(fmt.Sprintf("Court: %s\n", *c.Court))
+		}
+		for _, p := range parties {
+			role := ""
+			if p.Role != nil {
+				role = *p.Role
+			}
+			b.WriteString(fmt.Sprintf("Party: %s (%s)\n", p.Name, role))
+		}
+		if description != "" {
+			b.WriteString(fmt.Sprintf("\nAdditional context: %s\n", description))
+		}
+		queryText = b.String()
+	} else if description != "" {
+		queryText = description
+	} else {
+		return nil, fmt.Errorf("either case_id or description must be provided")
+	}
+
+	// Query youpc.org database for candidate cases
+	// Search by text similarity across case titles, summaries, party names
+	var candidates []youpcCase
+	err := s.youpcDB.SelectContext(ctx, &candidates, `
+		SELECT
+			id,
+			case_number,
+			title,
+			court,
+			decision_date,
+			case_type,
+			outcome,
+			patent_numbers,
+			summary,
+			claimant,
+			defendant
+		FROM mlex.cases
+		ORDER BY decision_date DESC NULLS LAST
+		LIMIT 50
+	`)
+	if err != nil {
+		return nil, fmt.Errorf("querying youpc.org cases: %w", err)
+	}
+
+	if len(candidates) == 0 {
+		return []SimilarCase{}, nil
+	}
+
+	// Build candidate list for Claude
+	var candidateText strings.Builder
+	for _, c := range candidates {
+		candidateText.WriteString(fmt.Sprintf("ID: %s\n", c.ID))
+		if c.CaseNumber != nil {
+			candidateText.WriteString(fmt.Sprintf("Case Number: %s\n", *c.CaseNumber))
+		}
+		if c.Title != nil {
+			candidateText.WriteString(fmt.Sprintf("Title: %s\n", *c.Title))
+		}
+		if c.Court != nil {
+			candidateText.WriteString(fmt.Sprintf("Court: %s\n", *c.Court))
+		}
+		if c.DecisionDate != nil {
+			candidateText.WriteString(fmt.Sprintf("Decision Date: %s\n", *c.DecisionDate))
+		}
+		if c.CaseType != nil {
+			candidateText.WriteString(fmt.Sprintf("Type: %s\n", *c.CaseType))
+		}
+		if c.Outcome != nil {
+			candidateText.WriteString(fmt.Sprintf("Outcome: %s\n", *c.Outcome))
+		}
+		if c.PatentNumbers != nil {
+			candidateText.WriteString(fmt.Sprintf("Patents: %s\n", *c.PatentNumbers))
+		}
+		if c.Claimant != nil {
+			candidateText.WriteString(fmt.Sprintf("Claimant: %s\n", *c.Claimant))
+		}
+		if c.Defendant != nil {
+			candidateText.WriteString(fmt.Sprintf("Defendant: %s\n", *c.Defendant))
+		}
+		if c.Summary != nil {
+			candidateText.WriteString(fmt.Sprintf("Summary: %s\n", *c.Summary))
+		}
+		candidateText.WriteString("---\n")
+	}
+
+	prompt := fmt.Sprintf(`Find UPC cases relevant to this matter:
+
+%s
+
+Here are the UPC cases from the database to evaluate:
+
+%s
+
+Rank only the genuinely relevant cases by similarity.`, queryText, candidateText.String())
+
+	msg, err := s.client.Messages.New(ctx, anthropic.MessageNewParams{
+		Model:     anthropic.ModelClaudeSonnet4_20250514,
+		MaxTokens: 4096,
+		System: []anthropic.TextBlockParam{
+			{Text: similarCaseSystemPrompt},
+		},
+		Messages: []anthropic.MessageParam{
+			anthropic.NewUserMessage(anthropic.NewTextBlock(prompt)),
+		},
+		Tools: []anthropic.ToolUnionParam{
+			{OfTool: &similarCaseTool},
+		},
+		ToolChoice: anthropic.ToolChoiceParamOfTool("rank_similar_cases"),
+	})
+	if err != nil {
+		return nil, fmt.Errorf("claude API call: %w", err)
+	}
+
+	for _, block := range msg.Content {
+		if block.Type == "tool_use" && block.Name == "rank_similar_cases" {
+			var input similarCaseToolInput
+			if err := json.Unmarshal(block.Input, &input); err != nil {
+				return nil, fmt.Errorf("parsing similar cases output: %w", err)
+			}
+
+			// Build lookup map for candidate data
+			candidateMap := make(map[string]youpcCase)
+			for _, c := range candidates {
+				candidateMap[c.ID] = c
+			}
+
+			var results []SimilarCase
+			for _, ranked := range input.Cases {
+				if ranked.Relevance < 0.3 {
+					continue
+				}
+				c, ok := candidateMap[ranked.CaseID]
+				if !ok {
+					continue
+				}
+				sc := SimilarCase{
+					Relevance:   ranked.Relevance,
+					Explanation: ranked.Explanation,
+					KeyHoldings: ranked.KeyHoldings,
+				}
+				if c.CaseNumber != nil {
+					sc.CaseNumber = *c.CaseNumber
+				}
+				if c.Title != nil {
+					sc.Title = *c.Title
+				}
+				if c.Court != nil {
+					sc.Court = *c.Court
+				}
+				if c.DecisionDate != nil {
+					sc.Date = *c.DecisionDate
+				}
+				if c.CaseNumber != nil {
+					sc.URL = fmt.Sprintf("https://youpc.org/cases/%s", *c.CaseNumber)
+				}
+				results = append(results, sc)
+			}
+
+			return results, nil
+		}
+	}
+
+	return nil, fmt.Errorf("no tool_use block in response")
+}
--- a/frontend/src/app/(app)/cases/[id]/ki/page.tsx
+++ b/frontend/src/app/(app)/cases/[id]/ki/page.tsx
@@ -0,0 +1,51 @@
+"use client";
+
+import { useState } from "react";
+import { useParams } from "next/navigation";
+import { Brain, FileText, Search } from "lucide-react";
+import { CaseStrategy } from "@/components/ai/CaseStrategy";
+import { DocumentDrafter } from "@/components/ai/DocumentDrafter";
+import { SimilarCaseFinder } from "@/components/ai/SimilarCaseFinder";
+
+type AITab = "strategy" | "draft" | "similar";
+
+const TABS: { id: AITab; label: string; icon: typeof Brain }[] = [
+  { id: "strategy", label: "KI-Strategie", icon: Brain },
+  { id: "draft", label: "KI-Entwurf", icon: FileText },
+  { id: "similar", label: "Aehnliche Faelle", icon: Search },
+];
+
+export default function CaseAIPage() {
+  const { id } = useParams<{ id: string }>();
+  const [activeTab, setActiveTab] = useState<AITab>("strategy");
+
+  return (
+    <div>
+      {/* Sub-tabs */}
+      <div className="mb-6 flex gap-1 rounded-lg border border-neutral-200 bg-neutral-50 p-1">
+        {TABS.map((tab) => {
+          const isActive = activeTab === tab.id;
+          return (
+            <button
+              key={tab.id}
+              onClick={() => setActiveTab(tab.id)}
+              className={`inline-flex flex-1 items-center justify-center gap-1.5 rounded-md px-3 py-2 text-sm font-medium transition-colors ${
+                isActive
+                  ? "bg-white text-neutral-900 shadow-sm"
+                  : "text-neutral-500 hover:text-neutral-700"
+              }`}
+            >
+              <tab.icon className="h-4 w-4" />
+              {tab.label}
+            </button>
+          );
+        })}
+      </div>
+
+      {/* Content */}
+      {activeTab === "strategy" && <CaseStrategy caseId={id} />}
+      {activeTab === "draft" && <DocumentDrafter caseId={id} />}
+      {activeTab === "similar" && <SimilarCaseFinder caseId={id} />}
+    </div>
+  );
+}
--- a/frontend/src/app/(app)/cases/[id]/layout.tsx
+++ b/frontend/src/app/(app)/cases/[id]/layout.tsx
@@ -17,6 +17,7 @@ import {
  StickyNote,
  AlertTriangle,
  ScrollText,
+  Brain,
 } from "lucide-react";
 import { format } from "date-fns";
 import { de } from "date-fns/locale";
@@ -48,6 +49,7 @@ const TABS = [
  { segment: "mitarbeiter", label: "Mitarbeiter", icon: UserCheck },
  { segment: "notizen", label: "Notizen", icon: StickyNote },
  { segment: "protokoll", label: "Protokoll", icon: ScrollText },
+  { segment: "ki", label: "KI", icon: Brain },
 ] as const;

 const TAB_LABELS: Record<string, string> = {
@@ -58,6 +60,7 @@ const TAB_LABELS: Record<string, string> = {
  mitarbeiter: "Mitarbeiter",
  notizen: "Notizen",
  protokoll: "Protokoll",
+  ki: "KI",
 };

 function CaseDetailSkeleton() {
--- a/frontend/src/components/ai/CaseStrategy.tsx
+++ b/frontend/src/components/ai/CaseStrategy.tsx
@@ -0,0 +1,226 @@
+"use client";
+
+import { useMutation } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import type { StrategyRecommendation } from "@/lib/types";
+import {
+  Loader2,
+  Brain,
+  AlertTriangle,
+  ArrowRight,
+  Shield,
+  Calendar,
+  RefreshCw,
+} from "lucide-react";
+
+interface CaseStrategyProps {
+  caseId: string;
+}
+
+const PRIORITY_STYLES = {
+  high: "bg-red-50 text-red-700 border-red-200",
+  medium: "bg-amber-50 text-amber-700 border-amber-200",
+  low: "bg-emerald-50 text-emerald-700 border-emerald-200",
+} as const;
+
+const IMPORTANCE_STYLES = {
+  critical: "border-l-red-500",
+  important: "border-l-amber-500",
+  routine: "border-l-neutral-300",
+} as const;
+
+export function CaseStrategy({ caseId }: CaseStrategyProps) {
+  const mutation = useMutation({
+    mutationFn: () =>
+      api.post<StrategyRecommendation>("/ai/case-strategy", {
+        case_id: caseId,
+      }),
+  });
+
+  if (!mutation.data && !mutation.isPending && !mutation.isError) {
+    return (
+      <div className="flex flex-col items-center gap-3 py-8 text-center">
+        <div className="rounded-xl bg-neutral-100 p-3">
+          <Brain className="h-6 w-6 text-neutral-400" />
+        </div>
+        <div>
+          <p className="text-sm font-medium text-neutral-900">
+            KI-Strategieanalyse
+          </p>
+          <p className="mt-1 text-sm text-neutral-500">
+            Claude analysiert die Akte und gibt strategische Empfehlungen.
+          </p>
+        </div>
+        <button
+          onClick={() => mutation.mutate()}
+          className="inline-flex items-center gap-2 rounded-md bg-neutral-900 px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-neutral-800"
+        >
+          <Brain className="h-4 w-4" />
+          Strategie analysieren
+        </button>
+      </div>
+    );
+  }
+
+  if (mutation.isPending) {
+    return (
+      <div className="flex flex-col items-center gap-3 py-12 text-center">
+        <Loader2 className="h-6 w-6 animate-spin text-neutral-400" />
+        <p className="text-sm text-neutral-500">
+          Claude analysiert die Akte...
+        </p>
+        <p className="text-xs text-neutral-400">
+          Dies kann bis zu 30 Sekunden dauern.
+        </p>
+      </div>
+    );
+  }
+
+  if (mutation.isError) {
+    return (
+      <div className="flex flex-col items-center gap-3 py-8 text-center">
+        <div className="rounded-xl bg-red-50 p-3">
+          <AlertTriangle className="h-6 w-6 text-red-500" />
+        </div>
+        <p className="text-sm text-neutral-900">Analyse fehlgeschlagen</p>
+        <button
+          onClick={() => mutation.mutate()}
+          className="inline-flex items-center gap-1 text-sm text-neutral-500 transition-colors hover:text-neutral-700"
+        >
+          <RefreshCw className="h-3.5 w-3.5" />
+          Erneut versuchen
+        </button>
+      </div>
+    );
+  }
+
+  const data = mutation.data!;
+
+  return (
+    <div className="space-y-6">
+      <div className="flex items-center justify-between">
+        <h3 className="text-sm font-semibold text-neutral-900">
+          KI-Strategieanalyse
+        </h3>
+        <button
+          onClick={() => mutation.mutate()}
+          className="inline-flex items-center gap-1 rounded-md border border-neutral-200 px-2.5 py-1.5 text-xs font-medium text-neutral-600 transition-colors hover:bg-neutral-50"
+        >
+          <RefreshCw className="h-3.5 w-3.5" />
+          Aktualisieren
+        </button>
+      </div>
+
+      {/* Summary */}
+      <div className="rounded-md border border-blue-100 bg-blue-50 px-4 py-3 text-sm text-blue-800">
+        {data.summary}
+      </div>
+
+      {/* Next Steps */}
+      {data.next_steps?.length > 0 && (
+        <div>
+          <h4 className="mb-2 flex items-center gap-1.5 text-xs font-semibold uppercase tracking-wide text-neutral-500">
+            <ArrowRight className="h-3.5 w-3.5" />
+            Naechste Schritte
+          </h4>
+          <div className="space-y-2">
+            {data.next_steps.map((step, i) => (
+              <div
+                key={i}
+                className="rounded-md border border-neutral-200 bg-white px-4 py-3"
+              >
+                <div className="flex items-start gap-3">
+                  <span
+                    className={`mt-0.5 inline-block shrink-0 rounded-full border px-2 py-0.5 text-xs font-medium ${PRIORITY_STYLES[step.priority]}`}
+                  >
+                    {step.priority === "high"
+                      ? "Hoch"
+                      : step.priority === "medium"
+                        ? "Mittel"
+                        : "Niedrig"}
+                  </span>
+                  <div className="min-w-0">
+                    <p className="text-sm font-medium text-neutral-900">
+                      {step.action}
+                    </p>
+                    <p className="mt-1 text-sm text-neutral-500">
+                      {step.reasoning}
+                    </p>
+                    {step.deadline && (
+                      <p className="mt-1 text-xs text-neutral-400">
+                        Frist: {step.deadline}
+                      </p>
+                    )}
+                  </div>
+                </div>
+              </div>
+            ))}
+          </div>
+        </div>
+      )}
+
+      {/* Risk Assessment */}
+      {data.risk_assessment?.length > 0 && (
+        <div>
+          <h4 className="mb-2 flex items-center gap-1.5 text-xs font-semibold uppercase tracking-wide text-neutral-500">
+            <Shield className="h-3.5 w-3.5" />
+            Risikobewertung
+          </h4>
+          <div className="space-y-2">
+            {data.risk_assessment.map((risk, i) => (
+              <div
+                key={i}
+                className="rounded-md border border-neutral-200 bg-white px-4 py-3"
+              >
+                <div className="flex items-start gap-3">
+                  <span
+                    className={`mt-0.5 inline-block shrink-0 rounded-full border px-2 py-0.5 text-xs font-medium ${PRIORITY_STYLES[risk.level]}`}
+                  >
+                    {risk.level === "high"
+                      ? "Hoch"
+                      : risk.level === "medium"
+                        ? "Mittel"
+                        : "Niedrig"}
+                  </span>
+                  <div className="min-w-0">
+                    <p className="text-sm font-medium text-neutral-900">
+                      {risk.risk}
+                    </p>
+                    <p className="mt-1 text-sm text-neutral-500">
+                      Massnahme: {risk.mitigation}
+                    </p>
+                  </div>
+                </div>
+              </div>
+            ))}
+          </div>
+        </div>
+      )}
+
+      {/* Timeline */}
+      {data.timeline?.length > 0 && (
+        <div>
+          <h4 className="mb-2 flex items-center gap-1.5 text-xs font-semibold uppercase tracking-wide text-neutral-500">
+            <Calendar className="h-3.5 w-3.5" />
+            Zeitplan
+          </h4>
+          <div className="space-y-1">
+            {data.timeline.map((item, i) => (
+              <div
+                key={i}
+                className={`border-l-2 py-2 pl-4 ${IMPORTANCE_STYLES[item.importance]}`}
+              >
+                <div className="flex items-baseline gap-2">
+                  <span className="shrink-0 text-xs font-medium text-neutral-400">
+                    {item.date}
+                  </span>
+                  <span className="text-sm text-neutral-900">{item.event}</span>
+                </div>
+              </div>
+            ))}
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}
--- a/frontend/src/components/ai/DocumentDrafter.tsx
+++ b/frontend/src/components/ai/DocumentDrafter.tsx
@@ -0,0 +1,198 @@
+"use client";
+
+import { useState } from "react";
+import { useMutation } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import type { DocumentDraft, DraftDocumentRequest } from "@/lib/types";
+import { FileText, Loader2, Copy, Check, Download } from "lucide-react";
+
+const TEMPLATES = {
+  klageschrift: "Klageschrift",
+  klageerwiderung: "Klageerwiderung",
+  abmahnung: "Abmahnung",
+  schriftsatz: "Schriftsatz",
+  berufung: "Berufungsschrift",
+  antrag: "Antrag",
+  stellungnahme: "Stellungnahme",
+  gutachten: "Gutachten",
+  vertrag: "Vertrag",
+  vollmacht: "Vollmacht",
+  upc_claim: "UPC Statement of Claim",
+  upc_defence: "UPC Statement of Defence",
+  upc_counterclaim: "UPC Counterclaim for Revocation",
+  upc_injunction: "UPC Provisional Measures",
+} as const;
+
+const LANGUAGES = [
+  { value: "de", label: "Deutsch" },
+  { value: "en", label: "English" },
+  { value: "fr", label: "Francais" },
+] as const;
+
+const inputClass =
+  "w-full rounded-md border border-neutral-200 bg-white px-3 py-2 text-sm text-neutral-900 outline-none transition-colors focus:border-neutral-400 focus:ring-1 focus:ring-neutral-400";
+
+interface DocumentDrafterProps {
+  caseId: string;
+}
+
+export function DocumentDrafter({ caseId }: DocumentDrafterProps) {
+  const [templateType, setTemplateType] = useState("");
+  const [instructions, setInstructions] = useState("");
+  const [language, setLanguage] = useState("de");
+  const [copied, setCopied] = useState(false);
+
+  const mutation = useMutation({
+    mutationFn: (req: DraftDocumentRequest) =>
+      api.post<DocumentDraft>("/ai/draft-document", req),
+  });
+
+  function handleSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    if (!templateType) return;
+    mutation.mutate({
+      case_id: caseId,
+      template_type: templateType,
+      instructions,
+      language,
+    });
+  }
+
+  function handleCopy() {
+    if (mutation.data?.content) {
+      navigator.clipboard.writeText(mutation.data.content);
+      setCopied(true);
+      setTimeout(() => setCopied(false), 2000);
+    }
+  }
+
+  function handleDownload() {
+    if (!mutation.data?.content) return;
+    const blob = new Blob([mutation.data.content], { type: "text/plain;charset=utf-8" });
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement("a");
+    a.href = url;
+    a.download = `${templateType}_entwurf.txt`;
+    a.click();
+    URL.revokeObjectURL(url);
+  }
+
+  return (
+    <div className="space-y-4">
+      <form onSubmit={handleSubmit} className="space-y-3">
+        <div>
+          <label className="mb-1 block text-xs font-medium text-neutral-500">
+            Dokumenttyp
+          </label>
+          <select
+            value={templateType}
+            onChange={(e) => setTemplateType(e.target.value)}
+            className={inputClass}
+            disabled={mutation.isPending}
+          >
+            <option value="">Dokumenttyp waehlen...</option>
+            {Object.entries(TEMPLATES).map(([key, label]) => (
+              <option key={key} value={key}>
+                {label}
+              </option>
+            ))}
+          </select>
+        </div>
+
+        <div>
+          <label className="mb-1 block text-xs font-medium text-neutral-500">
+            Sprache
+          </label>
+          <select
+            value={language}
+            onChange={(e) => setLanguage(e.target.value)}
+            className={inputClass}
+            disabled={mutation.isPending}
+          >
+            {LANGUAGES.map((lang) => (
+              <option key={lang.value} value={lang.value}>
+                {lang.label}
+              </option>
+            ))}
+          </select>
+        </div>
+
+        <div>
+          <label className="mb-1 block text-xs font-medium text-neutral-500">
+            Anweisungen (optional)
+          </label>
+          <textarea
+            value={instructions}
+            onChange={(e) => setInstructions(e.target.value)}
+            placeholder="z.B. 'Fokus auf Patentanspruch 1, besonders die technischen Merkmale...'"
+            rows={3}
+            className={inputClass}
+            disabled={mutation.isPending}
+          />
+        </div>
+
+        <button
+          type="submit"
+          disabled={!templateType || mutation.isPending}
+          className="inline-flex items-center gap-2 rounded-md bg-neutral-900 px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-neutral-800 disabled:opacity-50"
+        >
+          {mutation.isPending ? (
+            <>
+              <Loader2 className="h-4 w-4 animate-spin" />
+              Dokument wird erstellt...
+            </>
+          ) : (
+            <>
+              <FileText className="h-4 w-4" />
+              KI-Entwurf erstellen
+            </>
+          )}
+        </button>
+      </form>
+
+      {mutation.isError && (
+        <div className="rounded-md border border-red-200 bg-red-50 px-4 py-3 text-sm text-red-700">
+          Fehler beim Erstellen des Entwurfs. Bitte versuchen Sie es erneut.
+        </div>
+      )}
+
+      {mutation.data && (
+        <div className="space-y-3">
+          <div className="flex items-center justify-between">
+            <h4 className="text-sm font-medium text-neutral-900">
+              {mutation.data.title}
+            </h4>
+            <div className="flex items-center gap-2">
+              <button
+                onClick={handleCopy}
+                className="inline-flex items-center gap-1 rounded-md border border-neutral-200 px-2.5 py-1.5 text-xs font-medium text-neutral-600 transition-colors hover:bg-neutral-50"
+              >
+                {copied ? (
+                  <>
+                    <Check className="h-3.5 w-3.5 text-emerald-500" />
+                    Kopiert
+                  </>
+                ) : (
+                  <>
+                    <Copy className="h-3.5 w-3.5" />
+                    Kopieren
+                  </>
+                )}
+              </button>
+              <button
+                onClick={handleDownload}
+                className="inline-flex items-center gap-1 rounded-md border border-neutral-200 px-2.5 py-1.5 text-xs font-medium text-neutral-600 transition-colors hover:bg-neutral-50"
+              >
+                <Download className="h-3.5 w-3.5" />
+                Download
+              </button>
+            </div>
+          </div>
+          <pre className="max-h-[600px] overflow-auto whitespace-pre-wrap rounded-md border border-neutral-200 bg-neutral-50 p-4 text-sm text-neutral-800">
+            {mutation.data.content}
+          </pre>
+        </div>
+      )}
+    </div>
+  );
+}
--- a/frontend/src/components/ai/SimilarCaseFinder.tsx
+++ b/frontend/src/components/ai/SimilarCaseFinder.tsx
@@ -0,0 +1,183 @@
+"use client";
+
+import { useState } from "react";
+import { useMutation } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import type { SimilarCasesResponse } from "@/lib/types";
+import {
+  Loader2,
+  Search,
+  ExternalLink,
+  AlertTriangle,
+  Scale,
+  RefreshCw,
+} from "lucide-react";
+
+interface SimilarCaseFinderProps {
+  caseId: string;
+}
+
+const inputClass =
+  "w-full rounded-md border border-neutral-200 bg-white px-3 py-2 text-sm text-neutral-900 outline-none transition-colors focus:border-neutral-400 focus:ring-1 focus:ring-neutral-400";
+
+function RelevanceBadge({ score }: { score: number }) {
+  const pct = Math.round(score * 100);
+  let color = "bg-neutral-100 text-neutral-600";
+  if (pct >= 80) color = "bg-emerald-50 text-emerald-700";
+  else if (pct >= 60) color = "bg-blue-50 text-blue-700";
+  else if (pct >= 40) color = "bg-amber-50 text-amber-700";
+  return (
+    <span
+      className={`inline-block shrink-0 rounded-full px-2 py-0.5 text-xs font-medium ${color}`}
+    >
+      {pct}%
+    </span>
+  );
+}
+
+export function SimilarCaseFinder({ caseId }: SimilarCaseFinderProps) {
+  const [description, setDescription] = useState("");
+
+  const mutation = useMutation({
+    mutationFn: (req: { case_id: string; description: string }) =>
+      api.post<SimilarCasesResponse>("/ai/similar-cases", req),
+  });
+
+  function handleSearch(e?: React.FormEvent) {
+    e?.preventDefault();
+    mutation.mutate({ case_id: caseId, description });
+  }
+
+  return (
+    <div className="space-y-4">
+      <form onSubmit={handleSearch} className="space-y-3">
+        <div>
+          <label className="mb-1 block text-xs font-medium text-neutral-500">
+            Zusaetzliche Beschreibung (optional)
+          </label>
+          <textarea
+            value={description}
+            onChange={(e) => setDescription(e.target.value)}
+            placeholder="z.B. 'SEP-Lizenzierung im Mobilfunkbereich, FRAND-Verteidigung...'"
+            rows={2}
+            className={inputClass}
+            disabled={mutation.isPending}
+          />
+        </div>
+
+        <button
+          type="submit"
+          disabled={mutation.isPending}
+          className="inline-flex items-center gap-2 rounded-md bg-neutral-900 px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-neutral-800 disabled:opacity-50"
+        >
+          {mutation.isPending ? (
+            <>
+              <Loader2 className="h-4 w-4 animate-spin" />
+              Suche laeuft...
+            </>
+          ) : (
+            <>
+              <Search className="h-4 w-4" />
+              Aehnliche Faelle suchen
+            </>
+          )}
+        </button>
+      </form>
+
+      {mutation.isError && (
+        <div className="flex flex-col items-center gap-3 py-6 text-center">
+          <div className="rounded-xl bg-red-50 p-3">
+            <AlertTriangle className="h-6 w-6 text-red-500" />
+          </div>
+          <p className="text-sm text-neutral-900">Suche fehlgeschlagen</p>
+          <p className="text-xs text-neutral-500">
+            Die youpc.org-Datenbank ist moeglicherweise nicht verfuegbar.
+          </p>
+          <button
+            onClick={() => handleSearch()}
+            className="inline-flex items-center gap-1 text-sm text-neutral-500 transition-colors hover:text-neutral-700"
+          >
+            <RefreshCw className="h-3.5 w-3.5" />
+            Erneut versuchen
+          </button>
+        </div>
+      )}
+
+      {mutation.data && (
+        <div className="space-y-3">
+          <div className="flex items-center justify-between">
+            <p className="text-xs text-neutral-500">
+              {mutation.data.count} aehnliche{" "}
+              {mutation.data.count === 1 ? "Fall" : "Faelle"} gefunden
+            </p>
+            <button
+              onClick={() => handleSearch()}
+              disabled={mutation.isPending}
+              className="inline-flex items-center gap-1 rounded-md border border-neutral-200 px-2.5 py-1.5 text-xs font-medium text-neutral-600 transition-colors hover:bg-neutral-50"
+            >
+              <RefreshCw className="h-3.5 w-3.5" />
+              Aktualisieren
+            </button>
+          </div>
+
+          {mutation.data.cases?.length === 0 && (
+            <div className="flex flex-col items-center gap-2 py-6 text-center">
+              <Scale className="h-6 w-6 text-neutral-300" />
+              <p className="text-sm text-neutral-500">
+                Keine aehnlichen UPC-Faelle gefunden.
+              </p>
+            </div>
+          )}
+
+          {mutation.data.cases?.map((c, i) => (
+            <div
+              key={i}
+              className="rounded-md border border-neutral-200 bg-white px-4 py-3"
+            >
+              <div className="flex items-start justify-between gap-3">
+                <div className="min-w-0 flex-1">
+                  <div className="flex items-center gap-2">
+                    <RelevanceBadge score={c.relevance} />
+                    <span className="text-xs font-medium text-neutral-400">
+                      {c.case_number}
+                    </span>
+                    {c.url && (
+                      <a
+                        href={c.url}
+                        target="_blank"
+                        rel="noopener noreferrer"
+                        className="text-neutral-400 transition-colors hover:text-neutral-600"
+                      >
+                        <ExternalLink className="h-3.5 w-3.5" />
+                      </a>
+                    )}
+                  </div>
+                  <p className="mt-1 text-sm font-medium text-neutral-900">
+                    {c.title}
+                  </p>
+                  <div className="mt-1 flex flex-wrap gap-x-3 text-xs text-neutral-400">
+                    {c.court && <span>{c.court}</span>}
+                    {c.date && <span>{c.date}</span>}
+                  </div>
+                </div>
+              </div>
+
+              <p className="mt-2 text-sm text-neutral-600">{c.explanation}</p>
+
+              {c.key_holdings && (
+                <div className="mt-2 rounded border border-neutral-100 bg-neutral-50 px-3 py-2">
+                  <p className="text-xs font-medium text-neutral-500">
+                    Relevante Entscheidungsgruende
+                  </p>
+                  <p className="mt-0.5 text-xs text-neutral-600">
+                    {c.key_holdings}
+                  </p>
+                </div>
+              )}
+            </div>
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}
--- a/frontend/src/lib/types.ts
+++ b/frontend/src/lib/types.ts
@@ -329,3 +329,81 @@ export interface ExtractionResponse {
  deadlines: ExtractedDeadline[];
  count: number;
 }
+
+// AI Document Drafting
+
+export interface DocumentDraft {
+  title: string;
+  content: string;
+  language: string;
+}
+
+export interface DraftDocumentRequest {
+  case_id: string;
+  template_type: string;
+  instructions: string;
+  language: string;
+}
+
+export const TEMPLATE_TYPES: Record<string, string> = {
+  klageschrift: "Klageschrift",
+  klageerwiderung: "Klageerwiderung",
+  abmahnung: "Abmahnung",
+  schriftsatz: "Schriftsatz",
+  berufung: "Berufungsschrift",
+  antrag: "Antrag",
+  stellungnahme: "Stellungnahme",
+  gutachten: "Gutachten",
+  vertrag: "Vertrag",
+  vollmacht: "Vollmacht",
+  upc_claim: "UPC Statement of Claim",
+  upc_defence: "UPC Statement of Defence",
+  upc_counterclaim: "UPC Counterclaim for Revocation",
+  upc_injunction: "UPC Provisional Measures",
+};
+
+// AI Case Strategy
+
+export interface StrategyStep {
+  priority: "high" | "medium" | "low";
+  action: string;
+  reasoning: string;
+  deadline?: string;
+}
+
+export interface RiskItem {
+  level: "high" | "medium" | "low";
+  risk: string;
+  mitigation: string;
+}
+
+export interface TimelineItem {
+  date: string;
+  event: string;
+  importance: "critical" | "important" | "routine";
+}
+
+export interface StrategyRecommendation {
+  summary: string;
+  next_steps: StrategyStep[];
+  risk_assessment: RiskItem[];
+  timeline: TimelineItem[];
+}
+
+// AI Similar Case Finder
+
+export interface SimilarCase {
+  case_number: string;
+  title: string;
+  court: string;
+  date: string;
+  relevance: number;
+  explanation: string;
+  key_holdings: string;
+  url?: string;
+}
+
+export interface SimilarCasesResponse {
+  cases: SimilarCase[];
+  count: number;
+}