diff --git a/AGENTS.md b/AGENTS.md
index 4709a23..ff9a592 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -195,6 +195,36 @@ npm run tauri build     # production build
 
 ---
 
+## Thread View (next major feature after reactions/replies)
+
+Clicking a note should open a thread view showing:
+- The root note
+- All replies in chronological order (or threaded if nested)
+- An inline reply composer at the bottom
+
+This is essential for replies to feel complete — right now replies are posted to the network but there's no way to read them in context within the app.
+
+Implementation notes:
+- Fetch replies via `kinds: [1], #e: [noteId]` NDK filter
+- Thread view can be a new `currentView` in the UI store, with a `selectedNote` state
+- Back navigation returns to the feed
+
+---
+
+## Onboarding
+
+Nostr onboarding is notoriously bad across most clients. Wrystr should be the exception.
+Goals:
+- Key generation built-in (no "go get a browser extension first")
+- Human-readable explanation of what a key is, without crypto jargon
+- One-click backup flow (show nsec, prompt to save it somewhere)
+- Optional: sign up with email/password via a custodial key service for non-technical users, with a clear path to self-custody later
+- New users should see interesting content immediately, not a blank feed
+
+This is a first-class feature, not an afterthought.
+
+---
+
 ## What to Avoid
 
 - Do NOT add new dependencies without checking if something in the existing stack covers it
diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..0970d74
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,57 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## What This Is
+
+Wrystr is a cross-platform Nostr desktop client built with Tauri 2.0 (Rust) + React + TypeScript. It connects to Nostr relays via NDK (Nostr Dev Kit) and aims for Telegram Desktop-quality UX.
+
+## Commands
+
+```bash
+npm run tauri dev       # Run full app with hot reload (recommended for development)
+npm run dev             # Vite-only dev server (no Tauri window)
+npm run build           # TypeScript compile + Vite build
+npm run tauri build     # Production binary
+```
+
+Prerequisites: Node.js 20+, Rust stable, `@tauri-apps/cli`
+
+## Architecture
+
+**Frontend** (`src/`): React 19 + TypeScript + Vite + Tailwind CSS 4
+
+- `src/App.tsx` — root component, view routing via UI store
+- `src/stores/` — Zustand stores per domain: `feed.ts`, `user.ts`, `ui.ts`
+- `src/lib/nostr/` — NDK wrapper; all Nostr calls go through here, never direct NDK in components
+- `src/types/nostr.ts` — shared TypeScript interfaces (NostrProfile, NostrNote, RelayInfo)
+- `src/components/feed/` — Feed, NoteCard, NoteContent
+- `src/components/shared/` — LoginModal, RelaysView, SettingsView
+- `src/components/sidebar/` — Sidebar navigation
+
+**Backend** (`src-tauri/`): Rust + Tauri 2.0
+
+- `src-tauri/src/lib.rs` — Tauri app init and command registration
+- Rust commands must return `Result<T, String>`
+- Future: OS keychain for key storage, SQLite, lightning integration
+
+## Key Conventions (from AGENTS.md)
+
+- Functional React components only — no class components
+- Never use `any` — define types in `src/types/`
+- Tailwind classes only — no inline styles
+- Private keys must never be exposed to JS; use OS keychain via Rust
+- New Zustand stores per domain when adding features
+- NDK interactions only through `src/lib/nostr/` wrapper
+
+## NIP Priority Reference
+
+- **P1 (core):** NIP-01, 02, 03, 10, 11, 19, 21, 25, 27, 50
+- **P2 (monetization):** NIP-47 (NWC/Lightning), NIP-57 (zaps), NIP-65 (relay lists)
+- **P3 (advanced):** NIP-04/44 (DMs), NIP-23 (articles), NIP-96 (file storage)
+
+## Current State
+
+Implemented: relay connection, global feed, note rendering, login (nsec/npub), sidebar navigation, Zustand stores.
+
+Not yet implemented: compose/post, reactions, zaps, DMs, profile editing, SQLite storage, OS keychain integration.
diff --git a/src/components/feed/ComposeBox.tsx b/src/components/feed/ComposeBox.tsx
new file mode 100644
index 0000000..3e97d82
--- /dev/null
+++ b/src/components/feed/ComposeBox.tsx
@@ -0,0 +1,97 @@
+import { useState, useRef } from "react";
+import { publishNote } from "../../lib/nostr";
+import { useUserStore } from "../../stores/user";
+import { shortenPubkey } from "../../lib/utils";
+
+export function ComposeBox({ onPublished }: { onPublished?: () => void }) {
+  const [text, setText] = useState("");
+  const [publishing, setPublishing] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const textareaRef = useRef<HTMLTextAreaElement>(null);
+
+  const { profile, npub } = useUserStore();
+  const avatar = profile?.picture;
+  const name = profile?.displayName || profile?.name || (npub ? shortenPubkey(npub) : "");
+
+  const charCount = text.length;
+  const overLimit = charCount > 280;
+  const canPost = text.trim().length > 0 && !overLimit && !publishing;
+
+  const handleKeyDown = (e: React.KeyboardEvent) => {
+    if (e.key === "Enter" && (e.ctrlKey || e.metaKey)) {
+      e.preventDefault();
+      if (canPost) handlePublish();
+    }
+  };
+
+  const handlePublish = async () => {
+    if (!canPost) return;
+    setPublishing(true);
+    setError(null);
+    try {
+      await publishNote(text.trim());
+      setText("");
+      textareaRef.current?.focus();
+      onPublished?.();
+    } catch (err) {
+      setError(`Failed to publish: ${err}`);
+    } finally {
+      setPublishing(false);
+    }
+  };
+
+  return (
+    <div className="border-b border-border px-4 py-3">
+      <div className="flex gap-3">
+        {/* Avatar */}
+        <div className="shrink-0">
+          {avatar ? (
+            <img
+              src={avatar}
+              alt=""
+              className="w-9 h-9 rounded-sm object-cover bg-bg-raised"
+              onError={(e) => { (e.target as HTMLImageElement).style.display = "none"; }}
+            />
+          ) : (
+            <div className="w-9 h-9 rounded-sm bg-bg-raised border border-border flex items-center justify-center text-text-dim text-xs">
+              {name.charAt(0).toUpperCase()}
+            </div>
+          )}
+        </div>
+
+        {/* Input area */}
+        <div className="flex-1 min-w-0">
+          <textarea
+            ref={textareaRef}
+            value={text}
+            onChange={(e) => setText(e.target.value)}
+            onKeyDown={handleKeyDown}
+            placeholder="What's on your mind?"
+            rows={3}
+            className="w-full bg-transparent text-text text-[13px] placeholder:text-text-dim resize-none focus:outline-none"
+          />
+
+          {error && (
+            <p className="text-danger text-[11px] mb-2">{error}</p>
+          )}
+
+          <div className="flex items-center justify-between mt-1">
+            <span className={`text-[10px] ${overLimit ? "text-danger" : "text-text-dim"}`}>
+              {charCount > 0 && `${charCount}/280`}
+            </span>
+            <div className="flex items-center gap-3">
+              <span className="text-text-dim text-[10px]">Ctrl+Enter to post</span>
+              <button
+                onClick={handlePublish}
+                disabled={!canPost}
+                className="px-3 py-1 text-[11px] bg-accent hover:bg-accent-hover text-white transition-colors disabled:opacity-30 disabled:cursor-not-allowed"
+              >
+                {publishing ? "posting…" : "post"}
+              </button>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}
diff --git a/src/components/feed/Feed.tsx b/src/components/feed/Feed.tsx
index 3127896..baafd8b 100644
--- a/src/components/feed/Feed.tsx
+++ b/src/components/feed/Feed.tsx
@@ -1,9 +1,12 @@
 import { useEffect } from "react";
 import { useFeedStore } from "../../stores/feed";
+import { useUserStore } from "../../stores/user";
 import { NoteCard } from "./NoteCard";
+import { ComposeBox } from "./ComposeBox";
 
 export function Feed() {
   const { notes, loading, connected, error, connect, loadFeed } = useFeedStore();
+  const { loggedIn } = useUserStore();
 
   useEffect(() => {
     connect().then(() => loadFeed());
@@ -31,6 +34,9 @@ export function Feed() {
         </div>
       </header>
 
+      {/* Compose */}
+      {loggedIn && <ComposeBox onPublished={loadFeed} />}
+
       {/* Feed */}
       <div className="flex-1 overflow-y-auto">
         {error && (
@@ -51,9 +57,14 @@ export function Feed() {
           </div>
         )}
 
-        {notes.map((event) => (
-          <NoteCard key={event.id} event={event} />
-        ))}
+        {notes
+          .filter((event) => {
+            const c = event.content.trim();
+            return c.length > 0 && !c.startsWith("{") && !c.startsWith("[");
+          })
+          .map((event) => (
+            <NoteCard key={event.id} event={event} />
+          ))}
       </div>
     </div>
   );
diff --git a/src/components/feed/NoteCard.tsx b/src/components/feed/NoteCard.tsx
index 15f9f57..8767e36 100644
--- a/src/components/feed/NoteCard.tsx
+++ b/src/components/feed/NoteCard.tsx
@@ -1,6 +1,9 @@
+import { useState, useRef } from "react";
 import { NDKEvent } from "@nostr-dev-kit/ndk";
 import { useProfile } from "../../hooks/useProfile";
+import { useUserStore } from "../../stores/user";
 import { timeAgo, shortenPubkey } from "../../lib/utils";
+import { publishReaction, publishReply } from "../../lib/nostr";
 import { NoteContent } from "./NoteContent";
 
 interface NoteCardProps {
@@ -14,6 +17,53 @@ export function NoteCard({ event }: NoteCardProps) {
   const nip05 = profile?.nip05;
   const time = event.created_at ? timeAgo(event.created_at) : "";
 
+  const { loggedIn } = useUserStore();
+  const [liked, setLiked] = useState(false);
+  const [liking, setLiking] = useState(false);
+  const [showReply, setShowReply] = useState(false);
+  const [replyText, setReplyText] = useState("");
+  const [replying, setReplying] = useState(false);
+  const [replyError, setReplyError] = useState<string | null>(null);
+  const [replySent, setReplySent] = useState(false);
+  const replyRef = useRef<HTMLTextAreaElement>(null);
+
+  const handleLike = async () => {
+    if (!loggedIn || liked || liking) return;
+    setLiking(true);
+    try {
+      await publishReaction(event.id, event.pubkey);
+      setLiked(true);
+    } finally {
+      setLiking(false);
+    }
+  };
+
+  const handleReply = () => {
+    setShowReply((v) => !v);
+    if (!showReply) setTimeout(() => replyRef.current?.focus(), 50);
+  };
+
+  const handleReplySubmit = async () => {
+    if (!replyText.trim() || replying) return;
+    setReplying(true);
+    setReplyError(null);
+    try {
+      await publishReply(replyText.trim(), { id: event.id, pubkey: event.pubkey });
+      setReplyText("");
+      setReplySent(true);
+      setTimeout(() => { setShowReply(false); setReplySent(false); }, 1500);
+    } catch (err) {
+      setReplyError(`Failed: ${err}`);
+    } finally {
+      setReplying(false);
+    }
+  };
+
+  const handleReplyKeyDown = (e: React.KeyboardEvent) => {
+    if (e.key === "Enter" && (e.ctrlKey || e.metaKey)) handleReplySubmit();
+    if (e.key === "Escape") setShowReply(false);
+  };
+
   return (
     <article className="border-b border-border px-4 py-3 hover:bg-bg-hover transition-colors duration-100">
       <div className="flex gap-3">
@@ -39,17 +89,63 @@ export function NoteCard({ event }: NoteCardProps) {
         {/* Content */}
         <div className="min-w-0 flex-1">
           <div className="flex items-baseline gap-2 mb-0.5">
-            <span className="text-text font-medium truncate text-[13px]">
-              {name}
-            </span>
+            <span className="text-text font-medium truncate text-[13px]">{name}</span>
             {nip05 && (
-              <span className="text-text-dim text-[10px] truncate max-w-40">
-                {nip05}
-              </span>
+              <span className="text-text-dim text-[10px] truncate max-w-40">{nip05}</span>
             )}
             <span className="text-text-dim text-[11px] shrink-0">{time}</span>
           </div>
+
           <NoteContent content={event.content} />
+
+          {/* Actions */}
+          {loggedIn && (
+            <div className="flex items-center gap-4 mt-2">
+              <button
+                onClick={handleReply}
+                className={`text-[11px] transition-colors ${
+                  showReply ? "text-accent" : "text-text-dim hover:text-text"
+                }`}
+              >
+                reply
+              </button>
+              <button
+                onClick={handleLike}
+                disabled={liked || liking}
+                className={`text-[11px] transition-colors ${
+                  liked ? "text-accent" : "text-text-dim hover:text-accent"
+                } disabled:cursor-default`}
+              >
+                {liked ? "♥ liked" : "♡ like"}
+              </button>
+            </div>
+          )}
+
+          {/* Inline reply box */}
+          {showReply && (
+            <div className="mt-2 border-l-2 border-border pl-3">
+              <textarea
+                ref={replyRef}
+                value={replyText}
+                onChange={(e) => setReplyText(e.target.value)}
+                onKeyDown={handleReplyKeyDown}
+                placeholder={`Reply to ${name}…`}
+                rows={2}
+                className="w-full bg-transparent text-text text-[12px] placeholder:text-text-dim resize-none focus:outline-none"
+              />
+              {replyError && <p className="text-danger text-[10px] mb-1">{replyError}</p>}
+              <div className="flex items-center justify-end gap-2 mt-1">
+                <span className="text-text-dim text-[10px]">Ctrl+Enter</span>
+                <button
+                  onClick={handleReplySubmit}
+                  disabled={!replyText.trim() || replying}
+                  className="px-2 py-0.5 text-[10px] bg-accent hover:bg-accent-hover text-white transition-colors disabled:opacity-30 disabled:cursor-not-allowed"
+                >
+                  {replySent ? "replied ✓" : replying ? "posting…" : "reply"}
+                </button>
+              </div>
+            </div>
+          )}
         </div>
       </div>
     </article>
diff --git a/src/components/sidebar/Sidebar.tsx b/src/components/sidebar/Sidebar.tsx
index caf232b..22f97c0 100644
--- a/src/components/sidebar/Sidebar.tsx
+++ b/src/components/sidebar/Sidebar.tsx
@@ -42,7 +42,7 @@ export function Sidebar() {
         </div>
 
         {/* Nav */}
-        <nav className="flex-1 py-2">
+        <nav className="flex-1 overflow-y-auto py-2">
           {NAV_ITEMS.map((item) => (
             <button
               key={item.id}
@@ -61,7 +61,7 @@ export function Sidebar() {
 
         {/* User / Login */}
         {!sidebarCollapsed && (
-          <div className="border-t border-border">
+          <div className="border-t border-border shrink-0">
             {loggedIn ? (
               <div className="px-3 py-2">
                 <div className="flex items-center gap-2 mb-1.5">
@@ -105,7 +105,7 @@ export function Sidebar() {
 
         {/* Status footer */}
         {!sidebarCollapsed && (
-          <div className="border-t border-border px-3 py-2 text-[10px] text-text-dim">
+          <div className="border-t border-border px-3 py-2 text-[10px] text-text-dim shrink-0">
             <div className="flex items-center gap-1.5">
               <span className={`w-1.5 h-1.5 rounded-full ${connected ? "bg-success" : "bg-danger"}`} />
               <span>{connected ? "online" : "offline"}</span>
diff --git a/src/lib/nostr/client.ts b/src/lib/nostr/client.ts
index a101019..a85b49a 100644
--- a/src/lib/nostr/client.ts
+++ b/src/lib/nostr/client.ts
@@ -61,6 +61,44 @@ export async function fetchGlobalFeed(limit: number = 50): Promise<NDKEvent[]> {
   return Array.from(events).sort((a, b) => (b.created_at ?? 0) - (a.created_at ?? 0));
 }
 
+export async function publishReaction(eventId: string, eventPubkey: string, reaction = "+"): Promise<void> {
+  const instance = getNDK();
+  if (!instance.signer) throw new Error("Not logged in");
+
+  const event = new NDKEvent(instance);
+  event.kind = NDKKind.Reaction;
+  event.content = reaction;
+  event.tags = [
+    ["e", eventId],
+    ["p", eventPubkey],
+  ];
+  await event.publish();
+}
+
+export async function publishReply(content: string, replyTo: { id: string; pubkey: string }): Promise<void> {
+  const instance = getNDK();
+  if (!instance.signer) throw new Error("Not logged in");
+
+  const event = new NDKEvent(instance);
+  event.kind = NDKKind.Text;
+  event.content = content;
+  event.tags = [
+    ["e", replyTo.id, "", "reply"],
+    ["p", replyTo.pubkey],
+  ];
+  await event.publish();
+}
+
+export async function publishNote(content: string): Promise<void> {
+  const instance = getNDK();
+  if (!instance.signer) throw new Error("Not logged in");
+
+  const event = new NDKEvent(instance);
+  event.kind = NDKKind.Text;
+  event.content = content;
+  await event.publish();
+}
+
 export async function fetchProfile(pubkey: string) {
   const instance = getNDK();
   const user = instance.getUser({ pubkey });
diff --git a/src/lib/nostr/index.ts b/src/lib/nostr/index.ts
index dae89f2..cf11870 100644
--- a/src/lib/nostr/index.ts
+++ b/src/lib/nostr/index.ts
@@ -1 +1 @@
-export { getNDK, connectToRelays, fetchGlobalFeed, fetchProfile } from "./client";
+export { getNDK, connectToRelays, fetchGlobalFeed, publishNote, publishReaction, publishReply, fetchProfile } from "./client";
diff --git a/src/main.tsx b/src/main.tsx
index 832e75f..2733724 100644
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -2,6 +2,16 @@ import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
 import App from "./App";
 import "./index.css";
+import { useUserStore } from "./stores/user";
+
+// Restore session from localStorage
+const savedPubkey = localStorage.getItem("wrystr_pubkey");
+const savedLoginType = localStorage.getItem("wrystr_login_type");
+if (savedPubkey && savedLoginType === "pubkey") {
+  useUserStore.getState().loginWithPubkey(savedPubkey);
+}
+// Note: nsec is never stored, so nsec sessions can't be auto-restored.
+// Future: restore via OS keychain.
 
 createRoot(document.getElementById("root") as HTMLElement).render(
   <StrictMode>