diff --git a/CLAUDE.md b/CLAUDE.md
index 553f784..2efe1fc 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -1,6 +1,6 @@
 # Memex Chat — CLAUDE.md
 
-Obsidian plugin: Chat with your vault using Claude AI. Semantic TF-IDF context retrieval, `[[Note]]` mentions, thread history, streaming responses.
+Obsidian plugin: Chat with your vault using Claude AI. Semantic TF-IDF context retrieval, `@Notizname` mentions, thread history, prompt extension buttons, streaming responses.
 
 ## Build
 
@@ -17,24 +17,63 @@ Entry: `src/main.ts` → bundled to `main.js` via esbuild (CJS, ES2018 target).
 
 | File | Role |
 |---|---|
-| `src/main.ts` | Plugin entry — `MemexChatPlugin extends Plugin`. Registers view, commands, settings tab. |
-| `src/ChatView.ts` | Main UI — `ChatView extends ItemView`. Thread management, context preview, streaming render. View type: `memex-chat-view`. |
-| `src/VaultSearch.ts` | TF-IDF search engine. Builds in-memory index over all vault markdown files. No external API. |
-| `src/ClaudeClient.ts` | Anthropic API client. `streamChat()` yields `ClaudeStreamChunk` via async generator. Uses `fetch` directly (no SDK). |
-| `src/SettingsTab.ts` | `MemexChatSettingsTab` + `MemexChatSettings` interface + `DEFAULT_SETTINGS`. |
+| `src/main.ts` | Plugin entry — `MemexChatPlugin extends Plugin`. Registers view, commands, settings tab. Wires index rebuild and layout-ready hook. |
+| `src/ChatView.ts` | Main UI — `ChatView extends ItemView`. Thread management, sidebar history, context preview, mode buttons, streaming render, Copy/Save actions. View type: `memex-chat-view`. |
+| `src/VaultSearch.ts` | TF-IDF search engine. Builds in-memory index over all vault markdown files. Frontmatter property boost (5×). `findSimilarByName()` for unresolved link hints. |
+| `src/ClaudeClient.ts` | Anthropic API client. `streamChat()` yields `ClaudeStreamChunk` via async generator. Uses Obsidian `requestUrl` (no SDK, bypasses CORS). |
+| `src/SettingsTab.ts` | `MemexChatSettingsTab` + `MemexChatSettings` interface + `DEFAULT_SETTINGS`. Exports `PromptButton` interface. |
 | `styles.css` | All plugin styles. CSS classes prefixed `vc-` (e.g. `vc-root`, `vc-msg--assistant`). |
-| `manifest.json` | Obsidian plugin manifest. ID: `memex-chat`. |
+| `manifest.json` | Obsidian plugin manifest. ID: `memex-chat`. Version: `0.2.3`. |
 | `main.js` | Compiled output — do not edit manually, always rebuild. |
 
 ## Key Patterns
 
-- **Data persistence**: `this.saveData(this.data)` / `this.loadData()` — single object `{ settings, threads }`.
-- **Streaming**: `ClaudeClient.streamChat()` is an async generator; `ChatView` iterates it and calls `updateLastMessage()` per chunk.
-- **Context flow**: Query → `VaultSearch.search()` → context preview → user confirms → `sendMessage()` injects note content into the Claude prompt.
-- **Thread storage**: Optionally saved as Markdown to vault folder (default `Calendar/Chat/`).
+- **Data persistence**: `this.saveData(this.data)` / `this.loadData()` — single object `{ settings, threads }`. Settings merge on load preserves new fields via per-entry spread for `promptButtons`.
+- **Streaming**: `ClaudeClient.streamChat()` is an async generator; `ChatView` iterates it and calls `updateLastMessage()` per chunk. (Note: `requestUrl` delivers the full response at once — no true streaming.)
+- **Context flow**: Query → `VaultSearch.search()` → context preview → user confirms → `sendMessage()` injects note content into the Claude prompt. Auto-retrieve skipped when prompt extension buttons are active.
+- **System prompt layering**: base system prompt → optional `systemContextFile` → active `promptButtons` extension files (each appended with `\n\n---\n`).
+- **@mention syntax**: `@Notizname` — autocomplete triggers after 2 chars, inserts full basename. Parsing in `handleSend` matches vault filenames directly (handles spaces & special chars).
+- **Prompt buttons**: `activeExtensions: Set<string>` tracks active button file paths. Mode hint panel shows `helpText` above input; hidden after send. Date-search buttons parse month from query and filter files by `getFileDate()`.
+- **Thread sidebar**: Inline rename (double-click title). Collapsible "Verlauf" section loads vault chat files not in active threads via `parseThreadFromVault()`.
+- **Thread storage**: Optionally saved as Markdown to `threadsFolder` (default `Calendar/Chat/`). Filename: `YYYYMMDDHHmmss Title.md`. Frontmatter includes `id:` for dedup on re-import.
+- **Message actions**: Copy (clipboard) and "Als Notiz" (save to Obsidian's default new-note folder) appear on hover for finished assistant messages.
+- **Unresolved links**: `is-unresolved` class + inline "Ähnliche Notiz: X" hint via `findSimilarByName()`.
+- **History cap**: Last 10 messages sent to API per request.
 - **CSS prefix**: `vc-` for all plugin DOM classes. Do not use Obsidian internal class names.
+- **Event listeners**: Use `this.registerDomEvent()` for permanent listeners (auto-cleanup on view close). Inline `onclick` / `addEventListener` acceptable for dynamic elements that are re-created.
 - **TypeScript**: `strictNullChecks` on, `moduleResolution: bundler`. No tests currently.
 
+## Settings (MemexChatSettings)
+
+| Field | Default | Description |
+|---|---|---|
+| `apiKey` | `""` | Anthropic API key |
+| `model` | `claude-opus-4-5-20251101` | Claude model ID |
+| `maxTokens` | `8192` | Max output tokens (1024–16000) |
+| `maxContextNotes` | `6` | TF-IDF context notes per query |
+| `maxCharsPerNote` | `2500` | Characters per context note |
+| `systemPrompt` | (German default) | Base system instructions |
+| `systemContextFile` | `""` | Optional vault note appended to system prompt |
+| `autoRetrieveContext` | `true` | Auto-search on send |
+| `showContextPreview` | `true` | Show context confirm step |
+| `saveThreadsToVault` | `true` | Save chats as vault markdown files |
+| `threadsFolder` | `Calendar/Chat` | Folder for saved threads |
+| `sendOnEnter` | `false` | Enter sends (vs. Cmd+Enter) |
+| `contextProperties` | `[collection, related, up, tags]` | Frontmatter props boosted 5× in TF-IDF |
+| `promptButtons` | Draft Check, Monthly Check | Header mode buttons with system prompt extension |
+
+## Prompt Buttons (PromptButton interface)
+
+```typescript
+interface PromptButton {
+  label: string;
+  filePath: string;        // vault path to prompt note (without .md)
+  searchMode?: "date";     // enables date-based file search
+  searchFolders?: string[]; // restrict date search to these folders
+  helpText?: string;       // shown above input when button is active
+}
+```
+
 ## Deployment (Manual)
 
 Copy `main.js`, `manifest.json`, `styles.css` into `.obsidian/plugins/memex-chat/` in the target vault.