diff --git a/web/src/app/(app)/notes/[noteId]/page.tsx b/web/src/app/(app)/notes/[noteId]/page.tsx
index 3aa0564..157f453 100644
--- a/web/src/app/(app)/notes/[noteId]/page.tsx
+++ b/web/src/app/(app)/notes/[noteId]/page.tsx
@@ -11,6 +11,7 @@ import { TaskReviewPanel } from "@/components/TaskReviewPanel";
 import { ExtractedTasksPanel } from "@/components/ExtractedTasksPanel";
 import { ArtifactPanel } from "@/components/ArtifactPanel";
 import { AgentTimeline } from "@/components/AgentTimeline";
+import { SmartActionsPanel } from "@/components/SmartActionsPanel";
 import { LinkNoteModal } from "@/components/LinkNoteModal";
 import {
   archiveNote,
@@ -268,6 +269,13 @@ export default function NoteDetailPage() {
 
         <aside style={{ display: "grid", gap: "var(--nl-space-4)" }}>
           {error ? <div className="surface-card" style={{ padding: "var(--nl-space-4)", color: "var(--nl-text-secondary)" }}>{error}</div> : null}
+          <SmartActionsPanel
+            noteId={note.id}
+            workspaceId={note.workspaceId}
+            noteTags={note.tags}
+            onTagsAccepted={(tags) => void handleSave({ title: note.title, body: note.body }, { quiet: true })}
+            onResultCreated={() => void getNoteDetail(note.id, note.workspaceId).then(setNote)}
+          />
           <MetadataPanel note={note} />
           <NoteVersionsPanel noteId={note.id} workspaceId={note.workspaceId} />
           <LinkedNotesPanel linkedNotes={note.linkedNotes} />
diff --git a/web/src/app/(app)/prompts/page.tsx b/web/src/app/(app)/prompts/page.tsx
new file mode 100644
index 0000000..040e5bb
--- /dev/null
+++ b/web/src/app/(app)/prompts/page.tsx
@@ -0,0 +1,175 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { Sparkles, FileText, Image, Layers, Trash2 } from "lucide-react";
+import { AppShell } from "@/components/AppShell";
+import { listPromptTemplates, deletePromptTemplate } from "@/lib/prompt-client";
+import { toast } from "@/lib/toast";
+import type { PromptTemplate, PromptCategory } from "@/lib/types";
+
+const CATEGORY_LABELS: Record<PromptCategory, string> = {
+  transform: "Transform",
+  extract: "Extract",
+  generate: "Generate",
+  analysis: "Analysis",
+  vision: "Vision",
+  export: "Export",
+  custom: "Custom",
+};
+
+const INPUT_ICONS: Record<string, typeof FileText> = {
+  text: FileText,
+  image: Image,
+  "text+image": Layers,
+  "multi-note": Layers,
+};
+
+export default function PromptsPage() {
+  const [templates, setTemplates] = useState<PromptTemplate[]>([]);
+  const [activeCategory, setActiveCategory] = useState<PromptCategory | "all">("all");
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    void loadTemplates();
+  }, []);
+
+  async function loadTemplates() {
+    setLoading(true);
+    try {
+      setTemplates(await listPromptTemplates());
+    } catch {
+      toast.error("Could not load templates");
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  async function handleDelete(id: string) {
+    if (!confirm("Delete this custom template?")) return;
+    try {
+      await deletePromptTemplate(id);
+      setTemplates((prev) => prev.filter((t) => t.id !== id));
+      toast.success("Template deleted");
+    } catch {
+      toast.error("Could not delete template");
+    }
+  }
+
+  const categories = Array.from(new Set(templates.map((t) => t.category)));
+  const filtered = activeCategory === "all"
+    ? templates
+    : templates.filter((t) => t.category === activeCategory);
+
+  const builtIn = filtered.filter((t) => t.builtIn);
+  const custom = filtered.filter((t) => !t.builtIn);
+
+  return (
+    <AppShell
+      title="Prompt Templates"
+      description="Browse built-in and custom Smart Action templates."
+      actions={
+        <div className="badge">
+          <Sparkles size={14} /> {templates.length} templates
+        </div>
+      }
+    >
+      {/* Category filter */}
+      <div style={{ display: "flex", gap: "var(--nl-space-2)", flexWrap: "wrap", marginBottom: "var(--nl-space-4)" }}>
+        <button
+          className={`badge ${activeCategory === "all" ? "" : "surface-muted"}`}
+          onClick={() => setActiveCategory("all")}
+          aria-label="All categories"
+        >
+          All ({templates.length})
+        </button>
+        {categories.map((cat) => (
+          <button
+            key={cat}
+            className={`badge ${activeCategory === cat ? "" : "surface-muted"}`}
+            onClick={() => setActiveCategory(cat)}
+            aria-label={`Filter: ${CATEGORY_LABELS[cat]}`}
+          >
+            {CATEGORY_LABELS[cat]} ({templates.filter((t) => t.category === cat).length})
+          </button>
+        ))}
+      </div>
+
+      {loading && (
+        <div className="surface-card" style={{ padding: "var(--nl-space-6)", textAlign: "center", color: "var(--nl-text-secondary)" }}>
+          Loading templates…
+        </div>
+      )}
+
+      {/* Built-in templates */}
+      {builtIn.length > 0 && (
+        <section style={{ marginBottom: "var(--nl-space-6)" }}>
+          <h2 style={{ fontSize: "var(--nl-fs-lg)", marginBottom: "var(--nl-space-3)" }}>Built-in Templates</h2>
+          <div style={{ display: "grid", gridTemplateColumns: "repeat(auto-fill, minmax(280px, 1fr))", gap: "var(--nl-space-3)" }}>
+            {builtIn.map((t) => {
+              const Icon = INPUT_ICONS[t.inputType] ?? FileText;
+              return (
+                <div key={t.id} className="surface-card" style={{ padding: "var(--nl-space-4)", display: "grid", gap: "var(--nl-space-2)" }}>
+                  <div style={{ display: "flex", justifyContent: "space-between", alignItems: "center" }}>
+                    <span style={{ fontWeight: 600, display: "flex", alignItems: "center", gap: 6 }}>
+                      <Icon size={14} />
+                      {t.name}
+                    </span>
+                    <span className="badge" style={{ fontSize: "var(--nl-fs-xs)" }}>{CATEGORY_LABELS[t.category]}</span>
+                  </div>
+                  <p style={{ fontSize: "var(--nl-fs-sm)", color: "var(--nl-text-secondary)", margin: 0 }}>{t.description}</p>
+                  <div style={{ display: "flex", gap: "var(--nl-space-2)", fontSize: "var(--nl-fs-xs)", color: "var(--nl-text-secondary)" }}>
+                    <span>Input: {t.inputType}</span>
+                    <span>&middot;</span>
+                    <span>Output: {t.outputType}</span>
+                  </div>
+                </div>
+              );
+            })}
+          </div>
+        </section>
+      )}
+
+      {/* Custom templates */}
+      {custom.length > 0 && (
+        <section>
+          <h2 style={{ fontSize: "var(--nl-fs-lg)", marginBottom: "var(--nl-space-3)" }}>Custom Templates</h2>
+          <div style={{ display: "grid", gridTemplateColumns: "repeat(auto-fill, minmax(280px, 1fr))", gap: "var(--nl-space-3)" }}>
+            {custom.map((t) => {
+              const Icon = INPUT_ICONS[t.inputType] ?? FileText;
+              return (
+                <div key={t.id} className="surface-card" style={{ padding: "var(--nl-space-4)", display: "grid", gap: "var(--nl-space-2)" }}>
+                  <div style={{ display: "flex", justifyContent: "space-between", alignItems: "center" }}>
+                    <span style={{ fontWeight: 600, display: "flex", alignItems: "center", gap: 6 }}>
+                      <Icon size={14} />
+                      {t.name}
+                    </span>
+                    <button
+                      className="btn btn-secondary"
+                      style={{ fontSize: "var(--nl-fs-xs)", padding: "2px 6px" }}
+                      onClick={() => void handleDelete(t.id)}
+                      aria-label={`Delete template: ${t.name}`}
+                    >
+                      <Trash2 size={12} />
+                    </button>
+                  </div>
+                  <p style={{ fontSize: "var(--nl-fs-sm)", color: "var(--nl-text-secondary)", margin: 0 }}>{t.description}</p>
+                  <div style={{ display: "flex", gap: "var(--nl-space-2)", fontSize: "var(--nl-fs-xs)", color: "var(--nl-text-secondary)" }}>
+                    <span>Input: {t.inputType}</span>
+                    <span>&middot;</span>
+                    <span>Output: {t.outputType}</span>
+                  </div>
+                </div>
+              );
+            })}
+          </div>
+        </section>
+      )}
+
+      {!loading && filtered.length === 0 && (
+        <div className="surface-card" style={{ padding: "var(--nl-space-6)", textAlign: "center", color: "var(--nl-text-secondary)" }}>
+          No templates found for this category.
+        </div>
+      )}
+    </AppShell>
+  );
+}
diff --git a/web/src/components/Sidebar.tsx b/web/src/components/Sidebar.tsx
index ea82c07..ccb66d5 100644
--- a/web/src/components/Sidebar.tsx
+++ b/web/src/components/Sidebar.tsx
@@ -10,6 +10,7 @@ const navItems: { href: string; label: string; icon: typeof House; flag?: string
   { href: "/dashboard", label: "Dashboard", icon: House },
   { href: "/workspaces", label: "Workspaces", icon: FolderKanban },
   { href: "/reviews", label: "Reviews", icon: ShieldCheck, flag: "mcp_tools_enabled" },
+  { href: "/prompts", label: "Prompts", icon: Sparkles },
   { href: "/search", label: "Search", icon: Search },
   { href: "/chat", label: "Workspace chat", icon: MessageCircle },
   { href: "/settings", label: "Settings", icon: Settings },
diff --git a/web/src/components/SmartActionsPanel.tsx b/web/src/components/SmartActionsPanel.tsx
new file mode 100644
index 0000000..b3bbfaf
--- /dev/null
+++ b/web/src/components/SmartActionsPanel.tsx
@@ -0,0 +1,198 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { Sparkles, Clock, Tag, Copy, FileText, GitCompare, Loader2 } from "lucide-react";
+import { listPromptTemplates, runPrompt, suggestTags, getReadingTime } from "@/lib/prompt-client";
+import { toast } from "@/lib/toast";
+import type { PromptTemplate, PromptCategory, RunPromptOutput } from "@/lib/types";
+
+const CATEGORY_LABELS: Record<PromptCategory, string> = {
+  transform: "Transform",
+  extract: "Extract",
+  generate: "Generate",
+  analysis: "Analysis",
+  vision: "Vision",
+  export: "Export",
+  custom: "Custom",
+};
+
+interface SmartActionsPanelProps {
+  noteId: string;
+  workspaceId: string;
+  noteTags: string[];
+  onTagsAccepted?: (tags: string[]) => void;
+  onResultCreated?: () => void;
+}
+
+export function SmartActionsPanel({
+  noteId,
+  workspaceId,
+  noteTags,
+  onTagsAccepted,
+  onResultCreated,
+}: SmartActionsPanelProps) {
+  const [templates, setTemplates] = useState<PromptTemplate[]>([]);
+  const [readingTime, setReadingTime] = useState<{ wordCount: number; readingTimeMinutes: number } | null>(null);
+  const [suggestedTags, setSuggestedTags] = useState<string[]>([]);
+  const [runningId, setRunningId] = useState<string | null>(null);
+  const [result, setResult] = useState<RunPromptOutput | null>(null);
+  const [activeCategory, setActiveCategory] = useState<PromptCategory | "all">("all");
+
+  useEffect(() => {
+    void listPromptTemplates().then(setTemplates).catch(() => {});
+    void getReadingTime(noteId, workspaceId).then(setReadingTime).catch(() => {});
+  }, [noteId, workspaceId]);
+
+  const filtered = activeCategory === "all"
+    ? templates
+    : templates.filter((t) => t.category === activeCategory);
+
+  const categories = Array.from(new Set(templates.map((t) => t.category)));
+
+  async function handleRun(template: PromptTemplate) {
+    setRunningId(template.id);
+    setResult(null);
+    try {
+      const res = await runPrompt({ templateId: template.slug, noteId, workspaceId });
+      setResult(res);
+      onResultCreated?.();
+      toast.success(`"${template.name}" completed`);
+    } catch (err) {
+      toast.error(err instanceof Error ? err.message : "Smart action failed");
+    } finally {
+      setRunningId(null);
+    }
+  }
+
+  async function handleSuggestTags() {
+    try {
+      const tags = await suggestTags(noteId, workspaceId);
+      setSuggestedTags(tags.filter((t) => !noteTags.includes(t)));
+    } catch {
+      toast.error("Could not suggest tags");
+    }
+  }
+
+  function handleAcceptTag(tag: string) {
+    onTagsAccepted?.([...noteTags, tag]);
+    setSuggestedTags((prev) => prev.filter((t) => t !== tag));
+  }
+
+  return (
+    <section className="surface-card" style={{ padding: "var(--nl-space-5)", display: "grid", gap: "var(--nl-space-4)" }}>
+      <div style={{ display: "flex", alignItems: "center", gap: "var(--nl-space-2)" }}>
+        <Sparkles size={16} />
+        <strong>Smart Actions</strong>
+      </div>
+
+      {/* Reading time */}
+      {readingTime && (
+        <div style={{ display: "flex", alignItems: "center", gap: "var(--nl-space-2)", color: "var(--nl-text-secondary)", fontSize: "var(--nl-fs-sm)" }}>
+          <Clock size={14} />
+          <span>{readingTime.readingTimeMinutes} min read &middot; {readingTime.wordCount} words</span>
+        </div>
+      )}
+
+      {/* Tag suggestions */}
+      <div style={{ display: "flex", gap: "var(--nl-space-2)", flexWrap: "wrap", alignItems: "center" }}>
+        <button className="btn btn-secondary" style={{ fontSize: "var(--nl-fs-sm)", padding: "4px 10px" }} onClick={() => void handleSuggestTags()} aria-label="Suggest tags">
+          <Tag size={14} /> Suggest tags
+        </button>
+        {suggestedTags.map((tag) => (
+          <button
+            key={tag}
+            className="badge"
+            style={{ cursor: "pointer" }}
+            onClick={() => handleAcceptTag(tag)}
+            aria-label={`Accept tag: ${tag}`}
+          >
+            + {tag}
+          </button>
+        ))}
+      </div>
+
+      {/* Category filter */}
+      <div style={{ display: "flex", gap: "var(--nl-space-1)", flexWrap: "wrap" }}>
+        <button
+          className={`badge ${activeCategory === "all" ? "" : "surface-muted"}`}
+          onClick={() => setActiveCategory("all")}
+          aria-label="All categories"
+        >
+          All
+        </button>
+        {categories.map((cat) => (
+          <button
+            key={cat}
+            className={`badge ${activeCategory === cat ? "" : "surface-muted"}`}
+            onClick={() => setActiveCategory(cat)}
+            aria-label={`Filter: ${CATEGORY_LABELS[cat]}`}
+          >
+            {CATEGORY_LABELS[cat]}
+          </button>
+        ))}
+      </div>
+
+      {/* Template grid */}
+      <div style={{ display: "grid", gridTemplateColumns: "1fr 1fr", gap: "var(--nl-space-2)" }}>
+        {filtered.map((t) => (
+          <button
+            key={t.id}
+            className="surface-muted"
+            disabled={runningId !== null}
+            onClick={() => void handleRun(t)}
+            aria-label={`Run: ${t.name}`}
+            style={{
+              padding: "var(--nl-space-3)",
+              textAlign: "left",
+              cursor: runningId ? "wait" : "pointer",
+              opacity: runningId && runningId !== t.id ? 0.5 : 1,
+              display: "grid",
+              gap: 2,
+            }}
+          >
+            <span style={{ fontWeight: 600, fontSize: "var(--nl-fs-sm)", display: "flex", alignItems: "center", gap: 4 }}>
+              {runningId === t.id ? <Loader2 size={12} className="animate-spin" /> : <FileText size={12} />}
+              {t.name}
+            </span>
+            <span style={{ fontSize: "var(--nl-fs-xs)", color: "var(--nl-text-secondary)" }}>{t.description}</span>
+          </button>
+        ))}
+      </div>
+
+      {/* Result display */}
+      {result && (
+        <div className="surface-muted" style={{ padding: "var(--nl-space-4)", display: "grid", gap: "var(--nl-space-3)" }}>
+          <div style={{ display: "flex", justifyContent: "space-between", alignItems: "center" }}>
+            <strong style={{ fontSize: "var(--nl-fs-sm)" }}>Result</strong>
+            <div style={{ display: "flex", gap: "var(--nl-space-2)" }}>
+              <button
+                className="btn btn-secondary"
+                style={{ fontSize: "var(--nl-fs-xs)", padding: "2px 8px" }}
+                onClick={() => { void navigator.clipboard.writeText(result.content); toast.success("Copied"); }}
+                aria-label="Copy result"
+              >
+                <Copy size={12} /> Copy
+              </button>
+              <button
+                className="btn btn-secondary"
+                style={{ fontSize: "var(--nl-fs-xs)", padding: "2px 8px" }}
+                onClick={() => setResult(null)}
+                aria-label="Dismiss result"
+              >
+                Dismiss
+              </button>
+            </div>
+          </div>
+          <div style={{ whiteSpace: "pre-wrap", fontSize: "var(--nl-fs-sm)", maxHeight: 300, overflowY: "auto" }}>
+            {result.content}
+          </div>
+          {result.usage && (
+            <div style={{ fontSize: "var(--nl-fs-xs)", color: "var(--nl-text-secondary)" }}>
+              {result.model} &middot; {result.usage.totalTokens} tokens
+            </div>
+          )}
+        </div>
+      )}
+    </section>
+  );
+}
diff --git a/web/src/lib/prompt-client.ts b/web/src/lib/prompt-client.ts
new file mode 100644
index 0000000..6124ca0
--- /dev/null
+++ b/web/src/lib/prompt-client.ts
@@ -0,0 +1,127 @@
+"use client";
+
+import { createNotesApiClient } from "@/lib/api-helpers";
+import type {
+  PromptTemplate,
+  RunPromptInput,
+  RunPromptOutput,
+  SimilarNote,
+  KnowledgeGap,
+} from "@/lib/types";
+
+// ── Template CRUD ─────────────────────────────────────────────
+
+export async function listPromptTemplates(): Promise<PromptTemplate[]> {
+  const api = createNotesApiClient();
+  const res = await api.fetch<{ items: PromptTemplate[] }>("/note-prompts");
+  return res.items;
+}
+
+export async function getPromptTemplate(id: string): Promise<PromptTemplate> {
+  const api = createNotesApiClient();
+  return api.fetch<PromptTemplate>(`/note-prompts/${encodeURIComponent(id)}`);
+}
+
+export async function createPromptTemplate(
+  input: Omit<PromptTemplate, "id" | "builtIn">,
+): Promise<PromptTemplate> {
+  const api = createNotesApiClient();
+  return api.fetch<PromptTemplate>("/note-prompts", {
+    method: "POST",
+    body: JSON.stringify(input),
+  });
+}
+
+export async function deletePromptTemplate(id: string): Promise<void> {
+  const api = createNotesApiClient();
+  await api.fetch(`/note-prompts/${encodeURIComponent(id)}`, { method: "DELETE" });
+}
+
+// ── Run prompts ───────────────────────────────────────────────
+
+export async function runPrompt(input: RunPromptInput): Promise<RunPromptOutput> {
+  const api = createNotesApiClient();
+  return api.fetch<RunPromptOutput>("/note-prompts/run", {
+    method: "POST",
+    body: JSON.stringify(input),
+  });
+}
+
+// ── Intelligence endpoints ────────────────────────────────────
+
+export async function suggestTags(
+  noteId: string,
+  workspaceId: string,
+): Promise<string[]> {
+  const api = createNotesApiClient();
+  const res = await api.fetch<{ tags: string[] }>(
+    `/notes/${encodeURIComponent(noteId)}/suggest-tags`,
+    { method: "POST", body: JSON.stringify({ workspaceId }) },
+  );
+  return res.tags;
+}
+
+export async function checkDuplicates(
+  noteId: string,
+  workspaceId: string,
+  threshold = 0.85,
+): Promise<SimilarNote[]> {
+  const api = createNotesApiClient();
+  const res = await api.fetch<{ duplicates: SimilarNote[] }>(
+    `/notes/${encodeURIComponent(noteId)}/check-duplicates`,
+    { method: "POST", body: JSON.stringify({ workspaceId, threshold }) },
+  );
+  return res.duplicates;
+}
+
+export async function suggestLinks(
+  noteId: string,
+  workspaceId: string,
+  threshold = 0.6,
+): Promise<SimilarNote[]> {
+  const api = createNotesApiClient();
+  const res = await api.fetch<{ suggestions: SimilarNote[] }>(
+    `/notes/${encodeURIComponent(noteId)}/suggest-links`,
+    { method: "POST", body: JSON.stringify({ workspaceId, threshold }) },
+  );
+  return res.suggestions;
+}
+
+export async function getReadingTime(
+  noteId: string,
+  workspaceId: string,
+): Promise<{ wordCount: number; readingTimeMinutes: number }> {
+  const api = createNotesApiClient();
+  return api.fetch(`/notes/${encodeURIComponent(noteId)}/reading-time?workspaceId=${encodeURIComponent(workspaceId)}`);
+}
+
+export async function compareNotes(
+  noteIds: string[],
+  workspaceId: string,
+): Promise<RunPromptOutput> {
+  const api = createNotesApiClient();
+  return api.fetch<RunPromptOutput>("/notes/compare", {
+    method: "POST",
+    body: JSON.stringify({ noteIds, workspaceId }),
+  });
+}
+
+export async function mergeNotes(
+  noteIds: string[],
+  workspaceId: string,
+): Promise<RunPromptOutput> {
+  const api = createNotesApiClient();
+  return api.fetch<RunPromptOutput>("/notes/merge", {
+    method: "POST",
+    body: JSON.stringify({ noteIds, workspaceId }),
+  });
+}
+
+export async function getKnowledgeGaps(
+  workspaceId: string,
+): Promise<{ gaps: KnowledgeGap[]; topicMap: Record<string, number> }> {
+  const api = createNotesApiClient();
+  return api.fetch(`/workspaces/${encodeURIComponent(workspaceId)}/knowledge-gaps`, {
+    method: "POST",
+  });
+}
diff --git a/web/src/lib/types.ts b/web/src/lib/types.ts
index f583efb..e2e3c42 100644
--- a/web/src/lib/types.ts
+++ b/web/src/lib/types.ts
@@ -175,6 +175,53 @@ export type NoteRelationshipDoc = {
   relationshipType: string;
 };
 
+// ── Smart Actions / Prompt types ──
+
+export type PromptCategory = "transform" | "extract" | "generate" | "analysis" | "vision" | "export" | "custom";
+export type PromptInputType = "text" | "image" | "text+image" | "multi-note";
+export type PromptOutputType = "new_note" | "artifact" | "update_note";
+
+export interface PromptTemplate {
+  id: string;
+  slug: string;
+  name: string;
+  description: string;
+  category: PromptCategory;
+  inputType: PromptInputType;
+  outputType: PromptOutputType;
+  builtIn: boolean;
+  systemPrompt?: string;
+  userPromptTemplate?: string;
+}
+
+export interface RunPromptInput {
+  templateId: string;
+  noteId: string;
+  workspaceId: string;
+  imageUrl?: string;
+  parameters?: Record<string, string>;
+}
+
+export interface RunPromptOutput {
+  content: string;
+  templateSlug: string;
+  outputType: PromptOutputType;
+  model?: string;
+  usage?: { promptTokens: number; completionTokens: number; totalTokens: number };
+}
+
+export interface SimilarNote {
+  id: string;
+  title: string;
+  similarity: number;
+}
+
+export interface KnowledgeGap {
+  topic: string;
+  description: string;
+  suggestedTitle: string;
+}
+
 export type NoteListResponse = { items: NoteDoc[] };
 export type WorkspaceListResponse = { items: WorkspaceDoc[] };
 export type NoteTaskListResponse = { items: NoteTaskDoc[] };