Phase 3: Skills & Context — skill system, personal context, context layering

Backend:
- Skill model + migration (with FK on chats.skill_id)
- Personal + general skill CRUD services with access isolation
- Admin skill CRUD endpoints (POST/GET/PATCH/DELETE /admin/skills)
- User skill CRUD endpoints (POST/GET/PATCH/DELETE /skills/)
- Personal context GET/PUT at /users/me/context
- Extended context assembly: primary + personal context + skill prompt
- Chat creation/update now accepts skill_id with validation

Frontend:
- Skill selector dropdown in chat header (grouped: general + personal)
- Reusable skill editor form component
- Admin skills management page (/admin/skills)
- Personal skills page (/skills)
- Personal context editor page (/profile/context)
- Updated sidebar: Skills, My Context nav items + admin skills link
- English + Russian translations for all skill/context UI

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

frontend/public/locales/en/translation.json

@@ -36,7 +36,8 @@
     "admin": "Admin",
     "users": "Users",
     "context": "Context",
-    "skills": "Skills"
+    "skills": "Skills",
+    "personal_context": "My Context"
   },
   "dashboard": {
     "welcome": "Welcome, {{name}}",
@@ -64,6 +65,31 @@
     "version": "Version",
     "characters": "characters"
   },
+  "skills": {
+    "my_skills": "My Skills",
+    "general_skills": "General Skills",
+    "no_skills": "No skills yet.",
+    "no_personal_skills": "You haven't created any personal skills yet.",
+    "create_personal": "Create Personal Skill",
+    "edit_personal": "Edit Personal Skill",
+    "create_general": "Create General Skill",
+    "edit_general": "Edit General Skill",
+    "name": "Name",
+    "name_placeholder": "e.g. Cardiologist",
+    "description": "Description",
+    "description_placeholder": "Brief description of this specialist",
+    "system_prompt": "System Prompt",
+    "prompt_placeholder": "Instructions for the AI when using this skill...",
+    "icon": "Icon",
+    "no_skill": "No specialist",
+    "general": "General",
+    "personal": "Personal"
+  },
+  "personal_context": {
+    "title": "Personal Context",
+    "subtitle": "This context is added to all your AI conversations",
+    "placeholder": "Add personal information that the AI should know about you..."
+  },
   "common": {
     "loading": "Loading...",
     "error": "An error occurred",

frontend/public/locales/ru/translation.json

@@ -36,7 +36,8 @@
     "admin": "Администрирование",
     "users": "Пользователи",
     "context": "Контекст",
-    "skills": "Навыки"
+    "skills": "Навыки",
+    "personal_context": "Мой контекст"
   },
   "dashboard": {
     "welcome": "Добро пожаловать, {{name}}",
@@ -64,6 +65,31 @@
     "version": "Версия",
     "characters": "символов"
   },
+  "skills": {
+    "my_skills": "Мои навыки",
+    "general_skills": "Общие навыки",
+    "no_skills": "Навыков пока нет.",
+    "no_personal_skills": "Вы ещё не создали персональных навыков.",
+    "create_personal": "Создать персональный навык",
+    "edit_personal": "Редактировать навык",
+    "create_general": "Создать общий навык",
+    "edit_general": "Редактировать общий навык",
+    "name": "Название",
+    "name_placeholder": "напр. Кардиолог",
+    "description": "Описание",
+    "description_placeholder": "Краткое описание специалиста",
+    "system_prompt": "Системный промпт",
+    "prompt_placeholder": "Инструкции для ИИ при использовании этого навыка...",
+    "icon": "Иконка",
+    "no_skill": "Без специалиста",
+    "general": "Общие",
+    "personal": "Персональные"
+  },
+  "personal_context": {
+    "title": "Персональный контекст",
+    "subtitle": "Этот контекст добавляется ко всем вашим разговорам с ИИ",
+    "placeholder": "Добавьте личную информацию, которую ИИ должен знать о вас..."
+  },
   "common": {
     "loading": "Загрузка...",
     "error": "Произошла ошибка",

frontend/src/api/chats.ts

@@ -46,7 +46,7 @@ export async function getChat(chatId: string): Promise<Chat> {
 
 export async function updateChat(
   chatId: string,
-  updates: { title?: string; is_archived?: boolean }
+  updates: { title?: string; is_archived?: boolean; skill_id?: string }
 ): Promise<Chat> {
   const { data } = await api.patch<Chat>(`/chats/${chatId}`, updates);
   return data;

frontend/src/api/skills.ts

@@ -0,0 +1,93 @@
+import api from "./client";
+
+export interface Skill {
+  id: string;
+  user_id: string | null;
+  name: string;
+  description: string | null;
+  system_prompt: string;
+  icon: string | null;
+  is_active: boolean;
+  sort_order: number;
+  created_at: string;
+}
+
+export interface SkillListResponse {
+  skills: Skill[];
+}
+
+export async function getSkills(includeGeneral = true): Promise<Skill[]> {
+  const { data } = await api.get<SkillListResponse>("/skills/", {
+    params: { include_general: includeGeneral },
+  });
+  return data.skills;
+}
+
+export async function getSkill(skillId: string): Promise<Skill> {
+  const { data } = await api.get<Skill>(`/skills/${skillId}`);
+  return data;
+}
+
+export async function createSkill(skill: {
+  name: string;
+  description?: string;
+  system_prompt: string;
+  icon?: string;
+}): Promise<Skill> {
+  const { data } = await api.post<Skill>("/skills/", skill);
+  return data;
+}
+
+export async function updateSkill(
+  skillId: string,
+  updates: Partial<{
+    name: string;
+    description: string;
+    system_prompt: string;
+    icon: string;
+    is_active: boolean;
+    sort_order: number;
+  }>
+): Promise<Skill> {
+  const { data } = await api.patch<Skill>(`/skills/${skillId}`, updates);
+  return data;
+}
+
+export async function deleteSkill(skillId: string): Promise<void> {
+  await api.delete(`/skills/${skillId}`);
+}
+
+// Admin skill functions
+export async function getGeneralSkills(): Promise<Skill[]> {
+  const { data } = await api.get<SkillListResponse>("/admin/skills");
+  return data.skills;
+}
+
+export async function createGeneralSkill(skill: {
+  name: string;
+  description?: string;
+  system_prompt: string;
+  icon?: string;
+}): Promise<Skill> {
+  const { data } = await api.post<Skill>("/admin/skills", skill);
+  return data;
+}
+
+export async function updateGeneralSkill(
+  skillId: string,
+  updates: Partial<{
+    name: string;
+    description: string;
+    system_prompt: string;
+    icon: string;
+    is_active: boolean;
+    sort_order: number;
+  }>
+): Promise<Skill> {
+  const { data } = await api.patch<Skill>(`/admin/skills/${skillId}`, updates);
+  return data;
+}
+
+export async function deleteGeneralSkill(skillId: string): Promise<void> {
+  await api.delete(`/admin/skills/${skillId}`);
+}

frontend/src/api/user-context.ts

@@ -0,0 +1,14 @@
+import api from "./client";
+import type { ContextFile } from "./admin";
+
+export async function getPersonalContext(): Promise<ContextFile | null> {
+  const { data } = await api.get<ContextFile | null>("/users/me/context");
+  return data;
+}
+
+export async function updatePersonalContext(
+  content: string
+): Promise<ContextFile> {
+  const { data } = await api.put<ContextFile>("/users/me/context", { content });
+  return data;
+}

frontend/src/components/admin/skill-editor.tsx

@@ -0,0 +1,97 @@
+import { useState, useEffect } from "react";
+import { useTranslation } from "react-i18next";
+import type { Skill } from "@/api/skills";
+
+interface SkillEditorProps {
+  skill?: Skill | null;
+  onSave: (data: { name: string; description: string; system_prompt: string; icon: string }) => void;
+  onCancel: () => void;
+  loading?: boolean;
+}
+
+export function SkillEditor({ skill, onSave, onCancel, loading }: SkillEditorProps) {
+  const { t } = useTranslation();
+  const [name, setName] = useState("");
+  const [description, setDescription] = useState("");
+  const [systemPrompt, setSystemPrompt] = useState("");
+  const [icon, setIcon] = useState("");
+
+  useEffect(() => {
+    if (skill) {
+      setName(skill.name);
+      setDescription(skill.description || "");
+      setSystemPrompt(skill.system_prompt);
+      setIcon(skill.icon || "");
+    }
+  }, [skill]);
+
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault();
+    onSave({ name, description, system_prompt: systemPrompt, icon });
+  };
+
+  return (
+    <form onSubmit={handleSubmit} className="space-y-4">
+      <div className="space-y-2">
+        <label className="text-sm font-medium">{t("skills.name")}</label>
+        <input
+          value={name}
+          onChange={(e) => setName(e.target.value)}
+          required
+          maxLength={100}
+          className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
+          placeholder={t("skills.name_placeholder")}
+        />
+      </div>
+
+      <div className="space-y-2">
+        <label className="text-sm font-medium">{t("skills.description")}</label>
+        <input
+          value={description}
+          onChange={(e) => setDescription(e.target.value)}
+          className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
+          placeholder={t("skills.description_placeholder")}
+        />
+      </div>
+
+      <div className="space-y-2">
+        <label className="text-sm font-medium">{t("skills.system_prompt")}</label>
+        <textarea
+          value={systemPrompt}
+          onChange={(e) => setSystemPrompt(e.target.value)}
+          required
+          rows={8}
+          className="w-full resize-y rounded-md border border-input bg-background px-3 py-2 text-sm font-mono ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
+          placeholder={t("skills.prompt_placeholder")}
+        />
+      </div>
+
+      <div className="space-y-2">
+        <label className="text-sm font-medium">{t("skills.icon")}</label>
+        <input
+          value={icon}
+          onChange={(e) => setIcon(e.target.value)}
+          className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
+          placeholder="e.g. heart, brain, stethoscope"
+        />
+      </div>
+
+      <div className="flex justify-end gap-2 pt-2">
+        <button
+          type="button"
+          onClick={onCancel}
+          className="inline-flex h-9 items-center rounded-md border px-4 text-sm font-medium hover:bg-accent transition-colors"
+        >
+          {t("common.cancel")}
+        </button>
+        <button
+          type="submit"
+          disabled={loading || !name.trim() || !systemPrompt.trim()}
+          className="inline-flex h-9 items-center rounded-md bg-primary px-4 text-sm font-medium text-primary-foreground hover:bg-primary/90 disabled:opacity-50 transition-colors"
+        >
+          {loading ? t("common.loading") : t("common.save")}
+        </button>
+      </div>
+    </form>
+  );
+}

frontend/src/components/chat/chat-window.tsx

@@ -2,14 +2,17 @@ import { useEffect, useRef } from "react";
 import { useTranslation } from "react-i18next";
 import { MessageBubble } from "./message-bubble";
 import { MessageInput } from "./message-input";
+import { SkillSelector } from "./skill-selector";
 import { useChatStore } from "@/stores/chat-store";
 import { MessageSquare } from "lucide-react";
 
 interface ChatWindowProps {
   onSendMessage: (content: string) => void;
+  onChangeSkill?: (skillId: string | null) => void;
+  currentSkillId?: string | null;
 }
 
-export function ChatWindow({ onSendMessage }: ChatWindowProps) {
+export function ChatWindow({ onSendMessage, onChangeSkill, currentSkillId }: ChatWindowProps) {
   const { t } = useTranslation();
   const { messages, isStreaming, streamingContent, currentChatId } = useChatStore();
   const bottomRef = useRef<HTMLDivElement>(null);
@@ -29,6 +32,17 @@ export function ChatWindow({ onSendMessage }: ChatWindowProps) {
 
   return (
     <div className="flex h-full flex-col">
+      {onChangeSkill && (
+        <div className="flex items-center gap-2 border-b px-4 py-2">
+          <div className="w-48">
+            <SkillSelector
+              value={currentSkillId ?? null}
+              onChange={onChangeSkill}
+              disabled={isStreaming}
+            />
+          </div>
+        </div>
+      )}
       <div className="flex-1 overflow-y-auto p-4 space-y-4">
         {messages.length === 0 && !isStreaming && (
           <div className="flex h-full items-center justify-center">

frontend/src/components/chat/skill-selector.tsx

@@ -0,0 +1,54 @@
+import { useTranslation } from "react-i18next";
+import { useQuery } from "@tanstack/react-query";
+import { getSkills } from "@/api/skills";
+import { Sparkles } from "lucide-react";
+
+interface SkillSelectorProps {
+  value: string | null;
+  onChange: (skillId: string | null) => void;
+  disabled?: boolean;
+}
+
+export function SkillSelector({ value, onChange, disabled }: SkillSelectorProps) {
+  const { t } = useTranslation();
+
+  const { data: skills = [] } = useQuery({
+    queryKey: ["skills"],
+    queryFn: () => getSkills(true),
+  });
+
+  const generalSkills = skills.filter((s) => s.user_id === null);
+  const personalSkills = skills.filter((s) => s.user_id !== null);
+
+  return (
+    <div className="relative">
+      <select
+        value={value || ""}
+        onChange={(e) => onChange(e.target.value || null)}
+        disabled={disabled}
+        className="flex h-9 w-full items-center rounded-md border border-input bg-background px-3 py-1 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring disabled:opacity-50 appearance-none pr-8"
+      >
+        <option value="">{t("skills.no_skill")}</option>
+        {generalSkills.length > 0 && (
+          <optgroup label={t("skills.general")}>
+            {generalSkills.map((s) => (
+              <option key={s.id} value={s.id}>
+                {s.name}
+              </option>
+            ))}
+          </optgroup>
+        )}
+        {personalSkills.length > 0 && (
+          <optgroup label={t("skills.personal")}>
+            {personalSkills.map((s) => (
+              <option key={s.id} value={s.id}>
+                {s.name}
+              </option>
+            ))}
+          </optgroup>
+        )}
+      </select>
+      <Sparkles className="absolute right-2 top-2.5 h-4 w-4 text-muted-foreground pointer-events-none" />
+    </div>
+  );
+}

frontend/src/components/layout/sidebar.tsx

@@ -3,21 +3,30 @@ import { NavLink } from "react-router-dom";
 import {
   LayoutDashboard,
   MessageSquare,
+  Sparkles,
   FileText,
   Brain,
   Bell,
   Shield,
+  BookOpen,
 } from "lucide-react";
 import { useAuthStore } from "@/stores/auth-store";
 import { useUIStore } from "@/stores/ui-store";
 import { cn } from "@/lib/utils";
 
 const navItems = [
-  { key: "dashboard", to: "/", icon: LayoutDashboard, enabled: true },
-  { key: "chats", to: "/chat", icon: MessageSquare, enabled: true },
-  { key: "documents", to: "/documents", icon: FileText, enabled: false },
-  { key: "memory", to: "/memory", icon: Brain, enabled: false },
-  { key: "notifications", to: "/notifications", icon: Bell, enabled: false },
+  { key: "dashboard", to: "/", icon: LayoutDashboard, enabled: true, end: true },
+  { key: "chats", to: "/chat", icon: MessageSquare, enabled: true, end: false },
+  { key: "skills", to: "/skills", icon: Sparkles, enabled: true, end: true },
+  { key: "personal_context", to: "/profile/context", icon: BookOpen, enabled: true, end: true },
+  { key: "documents", to: "/documents", icon: FileText, enabled: false, end: true },
+  { key: "memory", to: "/memory", icon: Brain, enabled: false, end: true },
+  { key: "notifications", to: "/notifications", icon: Bell, enabled: false, end: true },
+];
+
+const adminItems = [
+  { key: "admin_context", to: "/admin/context", label: "layout.context" },
+  { key: "admin_skills", to: "/admin/skills", label: "layout.skills" },
 ];
 
 export function Sidebar() {
@@ -25,6 +34,15 @@ export function Sidebar() {
   const user = useAuthStore((s) => s.user);
   const sidebarOpen = useUIStore((s) => s.sidebarOpen);
 
+  const linkClass = ({ isActive }: { isActive: boolean }) =>
+    cn(
+      "flex items-center gap-3 rounded-lg px-3 py-2 text-sm transition-colors",
+      isActive
+        ? "bg-primary/10 text-primary font-medium"
+        : "text-muted-foreground hover:bg-accent hover:text-foreground",
+      !sidebarOpen && "justify-center px-2"
+    );
+
   return (
     <aside
       className={cn(
@@ -33,10 +51,9 @@ export function Sidebar() {
       )}
     >
       <div className="flex h-14 items-center border-b px-4">
-        {sidebarOpen && (
+        {sidebarOpen ? (
           <span className="text-lg font-semibold text-primary">AI Assistant</span>
-        )}
-        {!sidebarOpen && (
+        ) : (
           <span className="text-lg font-semibold text-primary mx-auto">AI</span>
         )}
       </div>
@@ -60,20 +77,7 @@ export function Sidebar() {
           }
 
           return (
-            <NavLink
-              key={item.key}
-              to={item.to}
-              end
-              className={({ isActive }) =>
-                cn(
-                  "flex items-center gap-3 rounded-lg px-3 py-2 text-sm transition-colors",
-                  isActive
-                    ? "bg-primary/10 text-primary font-medium"
-                    : "text-muted-foreground hover:bg-accent hover:text-foreground",
-                  !sidebarOpen && "justify-center px-2"
-                )
-              }
-            >
+            <NavLink key={item.key} to={item.to} end={item.end} className={linkClass}>
               <Icon className="h-5 w-5 shrink-0" />
               {sidebarOpen && <span>{t(`layout.${item.key}`)}</span>}
             </NavLink>
@@ -82,22 +86,18 @@ export function Sidebar() {
       </nav>
 
       {user?.role === "admin" && (
-        <div className="border-t p-2">
-          <NavLink
-            to="/admin/context"
-            className={({ isActive }) =>
-              cn(
-                "flex items-center gap-3 rounded-lg px-3 py-2 text-sm transition-colors",
-                isActive
-                  ? "bg-primary/10 text-primary font-medium"
-                  : "text-muted-foreground hover:bg-accent hover:text-foreground",
-                !sidebarOpen && "justify-center px-2"
-              )
-            }
-          >
-            <Shield className="h-5 w-5 shrink-0" />
-            {sidebarOpen && <span>{t("layout.admin")}</span>}
-          </NavLink>
+        <div className="border-t p-2 space-y-1">
+          {sidebarOpen && (
+            <p className="px-3 py-1 text-xs font-semibold text-muted-foreground uppercase tracking-wider">
+              {t("layout.admin")}
+            </p>
+          )}
+          {adminItems.map((item) => (
+            <NavLink key={item.key} to={item.to} className={linkClass}>
+              <Shield className="h-5 w-5 shrink-0" />
+              {sidebarOpen && <span>{t(item.label)}</span>}
+            </NavLink>
+          ))}
         </div>
       )}
     </aside>

frontend/src/pages/admin/skills.tsx

@@ -0,0 +1,114 @@
+import { useState } from "react";
+import { Navigate } from "react-router-dom";
+import { useTranslation } from "react-i18next";
+import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
+import { useAuthStore } from "@/stores/auth-store";
+import {
+  getGeneralSkills,
+  createGeneralSkill,
+  updateGeneralSkill,
+  deleteGeneralSkill,
+  type Skill,
+} from "@/api/skills";
+import { SkillEditor } from "@/components/admin/skill-editor";
+import { Plus, Pencil, Trash2, Sparkles } from "lucide-react";
+
+export function AdminSkillsPage() {
+  const { t } = useTranslation();
+  const user = useAuthStore((s) => s.user);
+  const queryClient = useQueryClient();
+  const [editing, setEditing] = useState<Skill | null>(null);
+  const [creating, setCreating] = useState(false);
+
+  if (user?.role !== "admin") return <Navigate to="/" replace />;
+
+  const { data: skills = [] } = useQuery({
+    queryKey: ["admin-skills"],
+    queryFn: getGeneralSkills,
+  });
+
+  const createMut = useMutation({
+    mutationFn: createGeneralSkill,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["admin-skills"] });
+      setCreating(false);
+    },
+  });
+
+  const updateMut = useMutation({
+    mutationFn: ({ id, ...data }: { id: string } & Record<string, string>) =>
+      updateGeneralSkill(id, data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["admin-skills"] });
+      setEditing(null);
+    },
+  });
+
+  const deleteMut = useMutation({
+    mutationFn: deleteGeneralSkill,
+    onSuccess: () => queryClient.invalidateQueries({ queryKey: ["admin-skills"] }),
+  });
+
+  if (creating || editing) {
+    return (
+      <div className="max-w-2xl space-y-4">
+        <h1 className="text-2xl font-semibold">
+          {creating ? t("skills.create_general") : t("skills.edit_general")}
+        </h1>
+        <SkillEditor
+          skill={editing}
+          onSave={(data) =>
+            editing
+              ? updateMut.mutate({ id: editing.id, ...data })
+              : createMut.mutate(data)
+          }
+          onCancel={() => { setCreating(false); setEditing(null); }}
+          loading={createMut.isPending || updateMut.isPending}
+        />
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center justify-between">
+        <h1 className="text-2xl font-semibold">{t("skills.general_skills")}</h1>
+        <button
+          onClick={() => setCreating(true)}
+          className="inline-flex h-9 items-center gap-2 rounded-md bg-primary px-4 text-sm font-medium text-primary-foreground hover:bg-primary/90 transition-colors"
+        >
+          <Plus className="h-4 w-4" /> {t("common.create")}
+        </button>
+      </div>
+
+      {skills.length === 0 && (
+        <p className="text-muted-foreground py-8 text-center">{t("skills.no_skills")}</p>
+      )}
+
+      <div className="space-y-2">
+        {skills.map((skill) => (
+          <div key={skill.id} className="flex items-center gap-3 rounded-lg border bg-card p-4">
+            <Sparkles className="h-5 w-5 text-primary shrink-0" />
+            <div className="flex-1 min-w-0">
+              <p className="font-medium">{skill.name}</p>
+              {skill.description && (
+                <p className="text-sm text-muted-foreground truncate">{skill.description}</p>
+              )}
+            </div>
+            <div className="flex gap-1">
+              <button onClick={() => setEditing(skill)} className="rounded p-2 hover:bg-accent transition-colors">
+                <Pencil className="h-4 w-4" />
+              </button>
+              <button
+                onClick={() => deleteMut.mutate(skill.id)}
+                className="rounded p-2 hover:bg-destructive/10 hover:text-destructive transition-colors"
+              >
+                <Trash2 className="h-4 w-4" />
+              </button>
+            </div>
+          </div>
+        ))}
+      </div>
+    </div>
+  );
+}

frontend/src/pages/chat.tsx

@@ -1,20 +1,34 @@
 import { useEffect } from "react";
 import { useParams, useNavigate } from "react-router-dom";
+import { useMutation, useQueryClient } from "@tanstack/react-query";
 import { ChatList } from "@/components/chat/chat-list";
 import { ChatWindow } from "@/components/chat/chat-window";
 import { useChatStore } from "@/stores/chat-store";
 import { useChat } from "@/hooks/use-chat";
+import { updateChat } from "@/api/chats";
 
 export function ChatPage() {
   const { chatId } = useParams();
   const navigate = useNavigate();
-  const setCurrentChat = useChatStore((s) => s.setCurrentChat);
+  const queryClient = useQueryClient();
+  const { currentChatId, chats, setCurrentChat, updateChatInList } = useChatStore();
   const { createChat, deleteChat, archiveChat, sendMessage, limitReached } = useChat();
 
   useEffect(() => {
     setCurrentChat(chatId || null);
   }, [chatId, setCurrentChat]);
 
+  const currentChat = chats.find((c) => c.id === currentChatId);
+
+  const skillMutation = useMutation({
+    mutationFn: ({ chatId, skillId }: { chatId: string; skillId: string | null }) =>
+      updateChat(chatId, { skill_id: skillId || undefined }),
+    onSuccess: (chat) => {
+      updateChatInList(chat);
+      queryClient.invalidateQueries({ queryKey: ["chats"] });
+    },
+  });
+
   const handleCreateChat = async () => {
     const chat = await createChat(undefined);
     navigate(`/chat/${chat.id}`);
@@ -25,6 +39,12 @@ export function ChatPage() {
     if (chatId === id) navigate("/chat");
   };
 
+  const handleChangeSkill = (skillId: string | null) => {
+    if (currentChatId) {
+      skillMutation.mutate({ chatId: currentChatId, skillId });
+    }
+  };
+
   return (
     <div className="flex h-full -m-6">
       <div className="w-64 shrink-0 border-r bg-card">
@@ -36,7 +56,11 @@ export function ChatPage() {
         />
       </div>
       <div className="flex-1">
-        <ChatWindow onSendMessage={sendMessage} />
+        <ChatWindow
+          onSendMessage={sendMessage}
+          onChangeSkill={handleChangeSkill}
+          currentSkillId={currentChat?.skill_id}
+        />
       </div>
     </div>
   );

frontend/src/pages/profile/context.tsx

@@ -0,0 +1,76 @@
+import { useState, useEffect } from "react";
+import { useTranslation } from "react-i18next";
+import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
+import { getPersonalContext, updatePersonalContext } from "@/api/user-context";
+import { Save } from "lucide-react";
+
+export function PersonalContextPage() {
+  const { t } = useTranslation();
+  const queryClient = useQueryClient();
+  const [content, setContent] = useState("");
+  const [hasChanges, setHasChanges] = useState(false);
+
+  const query = useQuery({
+    queryKey: ["personal-context"],
+    queryFn: getPersonalContext,
+  });
+
+  useEffect(() => {
+    if (query.data) {
+      setContent(query.data.content);
+      setHasChanges(false);
+    }
+  }, [query.data]);
+
+  const mutation = useMutation({
+    mutationFn: (text: string) => updatePersonalContext(text),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["personal-context"] });
+      setHasChanges(false);
+    },
+  });
+
+  useEffect(() => {
+    const handler = (e: BeforeUnloadEvent) => {
+      if (hasChanges) e.preventDefault();
+    };
+    window.addEventListener("beforeunload", handler);
+    return () => window.removeEventListener("beforeunload", handler);
+  }, [hasChanges]);
+
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-2xl font-semibold tracking-tight">
+            {t("personal_context.title")}
+          </h1>
+          <p className="text-sm text-muted-foreground">
+            {t("personal_context.subtitle")}
+          </p>
+        </div>
+        <div className="flex items-center gap-2">
+          {hasChanges && (
+            <span className="text-sm text-amber-500">{t("admin.unsaved_changes")}</span>
+          )}
+          <button
+            onClick={() => mutation.mutate(content)}
+            disabled={!hasChanges || mutation.isPending}
+            className="inline-flex h-9 items-center gap-2 rounded-md bg-primary px-4 text-sm font-medium text-primary-foreground hover:bg-primary/90 disabled:opacity-50 transition-colors"
+          >
+            <Save className="h-4 w-4" />
+            {mutation.isPending ? t("common.loading") : t("common.save")}
+          </button>
+        </div>
+      </div>
+
+      <textarea
+        value={content}
+        onChange={(e) => { setContent(e.target.value); setHasChanges(true); }}
+        rows={15}
+        className="w-full resize-y rounded-lg border border-input bg-background px-4 py-3 text-sm font-mono ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
+        placeholder={t("personal_context.placeholder")}
+      />
+    </div>
+  );
+}

frontend/src/pages/skills.tsx

@@ -0,0 +1,108 @@
+import { useState } from "react";
+import { useTranslation } from "react-i18next";
+import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
+import { getSkills, createSkill, updateSkill, deleteSkill, type Skill } from "@/api/skills";
+import { SkillEditor } from "@/components/admin/skill-editor";
+import { Plus, Pencil, Trash2, Sparkles } from "lucide-react";
+
+export function SkillsPage() {
+  const { t } = useTranslation();
+  const queryClient = useQueryClient();
+  const [editing, setEditing] = useState<Skill | null>(null);
+  const [creating, setCreating] = useState(false);
+
+  const { data: skills = [] } = useQuery({
+    queryKey: ["personal-skills"],
+    queryFn: () => getSkills(false),
+  });
+
+  const createMut = useMutation({
+    mutationFn: createSkill,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["personal-skills"] });
+      queryClient.invalidateQueries({ queryKey: ["skills"] });
+      setCreating(false);
+    },
+  });
+
+  const updateMut = useMutation({
+    mutationFn: ({ id, ...data }: { id: string } & Record<string, string>) =>
+      updateSkill(id, data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["personal-skills"] });
+      queryClient.invalidateQueries({ queryKey: ["skills"] });
+      setEditing(null);
+    },
+  });
+
+  const deleteMut = useMutation({
+    mutationFn: deleteSkill,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["personal-skills"] });
+      queryClient.invalidateQueries({ queryKey: ["skills"] });
+    },
+  });
+
+  if (creating || editing) {
+    return (
+      <div className="max-w-2xl space-y-4">
+        <h1 className="text-2xl font-semibold">
+          {creating ? t("skills.create_personal") : t("skills.edit_personal")}
+        </h1>
+        <SkillEditor
+          skill={editing}
+          onSave={(data) =>
+            editing
+              ? updateMut.mutate({ id: editing.id, ...data })
+              : createMut.mutate(data)
+          }
+          onCancel={() => { setCreating(false); setEditing(null); }}
+          loading={createMut.isPending || updateMut.isPending}
+        />
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center justify-between">
+        <h1 className="text-2xl font-semibold">{t("skills.my_skills")}</h1>
+        <button
+          onClick={() => setCreating(true)}
+          className="inline-flex h-9 items-center gap-2 rounded-md bg-primary px-4 text-sm font-medium text-primary-foreground hover:bg-primary/90 transition-colors"
+        >
+          <Plus className="h-4 w-4" /> {t("common.create")}
+        </button>
+      </div>
+
+      {skills.length === 0 && (
+        <p className="text-muted-foreground py-8 text-center">{t("skills.no_personal_skills")}</p>
+      )}
+
+      <div className="space-y-2">
+        {skills.map((skill) => (
+          <div key={skill.id} className="flex items-center gap-3 rounded-lg border bg-card p-4">
+            <Sparkles className="h-5 w-5 text-primary shrink-0" />
+            <div className="flex-1 min-w-0">
+              <p className="font-medium">{skill.name}</p>
+              {skill.description && (
+                <p className="text-sm text-muted-foreground truncate">{skill.description}</p>
+              )}
+            </div>
+            <div className="flex gap-1">
+              <button onClick={() => setEditing(skill)} className="rounded p-2 hover:bg-accent transition-colors">
+                <Pencil className="h-4 w-4" />
+              </button>
+              <button
+                onClick={() => deleteMut.mutate(skill.id)}
+                className="rounded p-2 hover:bg-destructive/10 hover:text-destructive transition-colors"
+              >
+                <Trash2 className="h-4 w-4" />
+              </button>
+            </div>
+          </div>
+        ))}
+      </div>
+    </div>
+  );
+}

frontend/src/routes.tsx

@@ -5,7 +5,10 @@ import { LoginPage } from "@/pages/login";
 import { RegisterPage } from "@/pages/register";
 import { DashboardPage } from "@/pages/dashboard";
 import { ChatPage } from "@/pages/chat";
+import { SkillsPage } from "@/pages/skills";
+import { PersonalContextPage } from "@/pages/profile/context";
 import { AdminContextPage } from "@/pages/admin/context";
+import { AdminSkillsPage } from "@/pages/admin/skills";
 import { NotFoundPage } from "@/pages/not-found";
 
 export const router = createBrowserRouter([
@@ -26,7 +29,10 @@ export const router = createBrowserRouter([
           { index: true, element: <DashboardPage /> },
           { path: "chat", element: <ChatPage /> },
           { path: "chat/:chatId", element: <ChatPage /> },
+          { path: "skills", element: <SkillsPage /> },
+          { path: "profile/context", element: <PersonalContextPage /> },
           { path: "admin/context", element: <AdminContextPage /> },
+          { path: "admin/skills", element: <AdminSkillsPage /> },
         ],
       },
     ],