feat(llm): allow the sidebar chat access to the note content

apps/client/src/widgets/sidebar/SidebarChat.tsx

@@ -7,6 +7,7 @@ import server from "../../services/server.js";
 import ActionButton from "../react/ActionButton.js";
 import Dropdown from "../react/Dropdown.js";
 import { FormListItem } from "../react/FormList.js";
+import { useActiveNoteContext } from "../react/hooks.js";
 import NoItems from "../react/NoItems.js";
 import ChatInputBar from "../type_widgets/llm_chat/ChatInputBar.js";
 import ChatMessage from "../type_widgets/llm_chat/ChatMessage.js";
@@ -27,6 +28,9 @@ export default function SidebarChat() {
     const saveTimeoutRef = useRef<ReturnType<typeof setTimeout>>();
     const historyDropdownRef = useRef<BootstrapDropdown | null>(null);
 
+    // Get the current active note context
+    const { noteId: activeNoteId } = useActiveNoteContext();
+
     // Use shared chat hook with sidebar-specific options
     const chat = useLlmChat(
         // onMessagesChange - trigger save
@@ -34,6 +38,11 @@ export default function SidebarChat() {
         { defaultEnableNoteTools: true, supportsExtendedThinking: true }
     );
 
+    // Update chat context when active note changes
+    useEffect(() => {
+        chat.setContextNoteId(activeNoteId ?? undefined);
+    }, [activeNoteId, chat.setContextNoteId]);
+
     // Ref to access chat methods in effects without triggering re-runs
     const chatRef = useRef(chat);
     chatRef.current = chat;

apps/client/src/widgets/type_widgets/llm_chat/useLlmChat.ts

@@ -15,6 +15,8 @@ export interface LlmChatOptions {
     defaultEnableNoteTools?: boolean;
     /** Whether extended thinking is supported */
     supportsExtendedThinking?: boolean;
+    /** Initial context note ID (the note the user is viewing) */
+    contextNoteId?: string;
 }
 
 export interface UseLlmChatReturn {
@@ -31,6 +33,7 @@ export interface UseLlmChatReturn {
     enableWebSearch: boolean;
     enableNoteTools: boolean;
     enableExtendedThinking: boolean;
+    contextNoteId: string | undefined;
     lastPromptTokens: number;
     messagesEndRef: React.RefObject<HTMLDivElement>;
     textareaRef: React.RefObject<HTMLTextAreaElement>;
@@ -42,6 +45,7 @@ export interface UseLlmChatReturn {
     setEnableWebSearch: (value: boolean) => void;
     setEnableNoteTools: (value: boolean) => void;
     setEnableExtendedThinking: (value: boolean) => void;
+    setContextNoteId: (noteId: string | undefined) => void;
 
     // Actions
     handleSubmit: (e: Event) => Promise<void>;
@@ -55,7 +59,7 @@ export function useLlmChat(
     onMessagesChange?: (messages: StoredMessage[]) => void,
     options: LlmChatOptions = {}
 ): UseLlmChatReturn {
-    const { defaultEnableNoteTools = false, supportsExtendedThinking = false } = options;
+    const { defaultEnableNoteTools = false, supportsExtendedThinking = false, contextNoteId: initialContextNoteId } = options;
 
     const [messages, setMessagesInternal] = useState<StoredMessage[]>([]);
     const [input, setInput] = useState("");
@@ -69,6 +73,7 @@ export function useLlmChat(
     const [enableWebSearch, setEnableWebSearch] = useState(true);
     const [enableNoteTools, setEnableNoteTools] = useState(defaultEnableNoteTools);
     const [enableExtendedThinking, setEnableExtendedThinking] = useState(false);
+    const [contextNoteId, setContextNoteId] = useState<string | undefined>(initialContextNoteId);
     const [lastPromptTokens, setLastPromptTokens] = useState<number>(0);
     const messagesEndRef = useRef<HTMLDivElement>(null);
     const textareaRef = useRef<HTMLTextAreaElement>(null);
@@ -84,6 +89,8 @@ export function useLlmChat(
     enableNoteToolsRef.current = enableNoteTools;
     const enableExtendedThinkingRef = useRef(enableExtendedThinking);
     enableExtendedThinkingRef.current = enableExtendedThinking;
+    const contextNoteIdRef = useRef(contextNoteId);
+    contextNoteIdRef.current = contextNoteId;
 
     // Wrapper to call onMessagesChange when messages update
     const setMessages = useCallback((newMessages: StoredMessage[]) => {
@@ -195,7 +202,8 @@ export function useLlmChat(
         const streamOptions: Parameters<typeof streamChatCompletion>[1] = {
             model: selectedModel || undefined,
             enableWebSearch,
-            enableNoteTools
+            enableNoteTools,
+            contextNoteId
         };
         if (supportsExtendedThinking) {
             streamOptions.enableExtendedThinking = enableExtendedThinking;
@@ -294,7 +302,7 @@ export function useLlmChat(
                 }
             }
         );
-    }, [input, isStreaming, messages, selectedModel, enableWebSearch, enableNoteTools, enableExtendedThinking, supportsExtendedThinking, setMessages]);
+    }, [input, isStreaming, messages, selectedModel, enableWebSearch, enableNoteTools, enableExtendedThinking, contextNoteId, supportsExtendedThinking, setMessages]);
 
     const handleKeyDown = useCallback((e: KeyboardEvent) => {
         if (e.key === "Enter" && !e.shiftKey) {
@@ -317,6 +325,7 @@ export function useLlmChat(
         enableWebSearch,
         enableNoteTools,
         enableExtendedThinking,
+        contextNoteId,
         lastPromptTokens,
         messagesEndRef,
         textareaRef,
@@ -328,6 +337,7 @@ export function useLlmChat(
         setEnableWebSearch,
         setEnableNoteTools,
         setEnableExtendedThinking,
+        setContextNoteId,
 
         // Actions
         handleSubmit,

apps/server/src/services/llm/providers/anthropic.ts

@@ -2,6 +2,7 @@ import { anthropic } from "@ai-sdk/anthropic";
 import { streamText, stepCountIs, type CoreMessage } from "ai";
 import type { LlmMessage } from "@triliumnext/commons";
 
+import becca from "../../../becca/becca.js";
 import { noteTools } from "../tools.js";
 import type { LlmProvider, LlmProviderConfig, ModelInfo, ModelPricing, StreamResult } from "../types.js";
 
@@ -94,6 +95,42 @@ const MODEL_PRICING: Record<string, ModelPricing> = Object.fromEntries(
     AVAILABLE_MODELS.map(m => [m.id, m.pricing])
 );
 
+/**
+ * Build context string from the current note being viewed.
+ */
+function buildNoteContext(noteId: string): string | null {
+    const note = becca.getNote(noteId);
+    if (!note) {
+        return null;
+    }
+
+    const parts: string[] = [];
+    parts.push(`The user is currently viewing a note titled "${note.title}" (ID: ${noteId}).`);
+
+    // Add note type context
+    if (note.type !== "text") {
+        parts.push(`Note type: ${note.type}`);
+    }
+
+    // Add content for text notes (truncate if too long)
+    if (note.type === "text" || note.type === "code") {
+        try {
+            const content = note.getContent();
+            if (typeof content === "string" && content.trim()) {
+                const maxLength = 4000;
+                const truncated = content.length > maxLength
+                    ? content.substring(0, maxLength) + "\n... (content truncated)"
+                    : content;
+                parts.push(`\nNote content:\n\`\`\`\n${truncated}\n\`\`\``);
+            }
+        } catch {
+            // Content not available
+        }
+    }
+
+    return parts.join("\n");
+}
+
 export class AnthropicProvider implements LlmProvider {
     name = "anthropic";
 
@@ -106,9 +143,19 @@ export class AnthropicProvider implements LlmProvider {
     }
 
     chat(messages: LlmMessage[], config: LlmProviderConfig): StreamResult {
-        const systemPrompt = config.systemPrompt || messages.find(m => m.role === "system")?.content;
+        let systemPrompt = config.systemPrompt || messages.find(m => m.role === "system")?.content;
         const chatMessages = messages.filter(m => m.role !== "system");
 
+        // Add note context if viewing a note
+        if (config.contextNoteId) {
+            const noteContext = buildNoteContext(config.contextNoteId);
+            if (noteContext) {
+                systemPrompt = systemPrompt
+                    ? `${systemPrompt}\n\n${noteContext}`
+                    : noteContext;
+            }
+        }
+
         // Convert to AI SDK message format
         const coreMessages: CoreMessage[] = chatMessages.map(m => ({
             role: m.role as "user" | "assistant",

packages/commons/src/lib/llm_api.ts

@@ -39,6 +39,8 @@ export interface LlmChatConfig {
     enableExtendedThinking?: boolean;
     /** Token budget for extended thinking (default: 10000) */
     thinkingBudget?: number;
+    /** Current note context (note ID the user is viewing) */
+    contextNoteId?: string;
 }
 
 /**