diff --git a/frontend/src/plugins/builtin/core-annotate/index.ts b/frontend/src/plugins/builtin/core-annotate/index.ts
new file mode 100644
index 0000000..dcd84ad
--- /dev/null
+++ b/frontend/src/plugins/builtin/core-annotate/index.ts
@@ -0,0 +1,141 @@
+/**
+ * core-annotate – Built-in V2-Plugin (Task A4.4).
+ *
+ * Werkzeuge: text (Platzierung — Inhalt via InlineTextEditor/PropertiesPanel,
+ * Bestandskanal onTextEdit bleibt), dimension (2-Punkt linear), leader
+ * (2-Punkt Pfeil+Label).
+ */
+import type { PluginV2, ToolExtensionV2, FullToolContext } from '../../types';
+import type { CADElement } from '../../../types/cad.types';
+import type { Pt } from '../../../tools/modification/geometry';
+
+const uid = (prefix: string): string =>
+  `${prefix}_${Date.now().toString(36)}_${Math.random().toString(36).slice(2, 9)}`;
+
+/** Gemeinsamer 2-Punkt-Sitzungsstart für dimension/leader. */
+let twoPointStart: Pt | null = null;
+
+function optsOf(ctx: FullToolContext): { stroke: string; layerId: string } {
+  return {
+    stroke: (ctx.options.strokeColor as string | undefined) ?? '#e0e0e0',
+    layerId: (ctx.options.layerId as string | undefined) ?? 'layer-0',
+  };
+}
+
+function buildDimension(start: Pt, end: Pt, ctx: FullToolContext): CADElement {
+  const o = optsOf(ctx);
+  return {
+    id: uid('dim'),
+    type: 'dimension',
+    layerId: o.layerId,
+    x: (start.x + end.x) / 2,
+    y: (start.y + end.y) / 2,
+    width: Math.hypot(end.x - start.x, end.y - start.y), // Legacy: dist als Breite
+    height: 20,
+    properties: { x1: start.x, y1: start.y, x2: end.x, y2: end.y },
+  } as unknown as CADElement;
+}
+
+function buildLeader(start: Pt, end: Pt, ctx: FullToolContext): CADElement {
+  const o = optsOf(ctx);
+  return {
+    id: uid('leader'),
+    type: 'leader',
+    layerId: o.layerId,
+    x: end.x,
+    y: end.y,
+    width: Math.abs(end.x - start.x),
+    height: Math.abs(end.y - start.y),
+    properties: { x1: start.x, y1: start.y, x2: end.x, y2: end.y, text: '', fontSize: 12, stroke: o.stroke, strokeWidth: 1 },
+  } as unknown as CADElement;
+}
+
+/** Generischer 2-Punkt-Annotate-Fluss (down→Preview→up commit). */
+function make2PointAnnotate(
+  id: 'dimension' | 'leader',
+  label: string,
+  icon: string,
+  build: (a: Pt, b: Pt, ctx: FullToolContext) => CADElement,
+): ToolExtensionV2 {
+  return {
+    manifest: { id, label, icon, ribbonTab: 'format', tags: ['basic'] },
+    optionsSchema: [{ key: 'strokeColor', label: 'Farbe', type: 'color' }],
+    handlers: {
+      down(e, ctx) {
+        twoPointStart = e.world;
+        ctx.setStatus(`${label}: Startpunkt gesetzt – Ende wählen`);
+      },
+      move(e, ctx) {
+        if (!twoPointStart) return;
+        ctx.setPreview?.(build(twoPointStart, e.world, ctx as FullToolContext));
+      },
+      up(e, ctx) {
+        const c = ctx as FullToolContext;
+        if (!twoPointStart || !c.doc) { twoPointStart = null; return; }
+        const el = build(twoPointStart, e.world, c);
+        c.doc.transact(() => c.doc!.addElement(el));
+        twoPointStart = null;
+        ctx.setPreview?.(null);
+        ctx.setStatus(`${label} erstellt (${el.id})`);
+      },
+      cancel(ctx) {
+        twoPointStart = null;
+        ctx.setPreview?.(null);
+        ctx.setStatus(`${label} abgebrochen`);
+      },
+    },
+  };
+}
+
+/**
+ * text-Werkzeug (A4.4): Klick platziert Textelement mit leerem Inhalt;
+ * Bearbeitung läuft über den bestehenden InlineTextEditor/onTextEdit-Kanal.
+ */
+export const textTool: ToolExtensionV2 = {
+  manifest: {
+    id: 'text',
+    label: 'Text',
+    icon: 'T',
+    ribbonTab: 'format',
+    tags: ['basic'],
+    description: 'Text platzieren und über Editor beschriften',
+  },
+  optionsSchema: [{ key: 'fontSize', label: 'Größe', type: 'number', min: 6, max: 72 }],
+  handlers: {
+    down(e, ctx) {
+      const c = ctx as FullToolContext;
+      if (!c.doc) return;
+      const layerId = (c.options.layerId as string | undefined) ?? 'layer-0';
+      const fontSize = (c.options.fontSize as number | undefined) ?? 12;
+      const el = {
+        id: uid('text'),
+        type: 'text',
+        layerId,
+        x: e.world.x,
+        y: e.world.y,
+        width: 100,
+        height: 20,
+        properties: { text: '', fontSize },
+      } as unknown as CADElement;
+      c.doc.transact(() => c.doc!.addElement(el));
+      ctx.setStatus(`Text platziert (${el.id}) – now via Editor`);
+    },
+  },
+};
+
+export const dimensionTool: ToolExtensionV2 = make2PointAnnotate('dimension', 'Bemaßung', '\u2194', buildDimension);
+export const leaderTool: ToolExtensionV2 = make2PointAnnotate('leader', 'Leader', '\u21b1', buildLeader);
+
+/** V2-Plugin: Beschriftung/Bemaßung (A4.4). */
+export const coreAnnotatePlugin: PluginV2 = {
+  manifest: {
+    id: 'core-annotate',
+    name: 'Beschriftung (Kern)',
+    version: '1.0.0',
+    author: 'web-cad team',
+    description: 'Text, Bemaßung, Leader (V2).',
+    category: 'tools',
+    enabledByDefault: true,
+  },
+  tools: [textTool, dimensionTool, leaderTool],
+};
diff --git a/frontend/src/plugins/index.ts b/frontend/src/plugins/index.ts
index f5787b8..410de97 100644
--- a/frontend/src/plugins/index.ts
+++ b/frontend/src/plugins/index.ts
@@ -29,16 +29,19 @@ export type {
 export { eventToolsPlugin } from './builtin/eventTools';
 export { coreDrawingPlugin } from './builtin/core-drawing';
 export { coreModifyPlugin } from './builtin/core-modify';
+export { coreAnnotatePlugin } from './builtin/core-annotate';
 
 import { pluginRegistry } from './PluginRegistry';
 import { eventToolsPlugin } from './builtin/eventTools';
 import { coreDrawingPlugin } from './builtin/core-drawing';
 import { coreModifyPlugin } from './builtin/core-modify';
+import { coreAnnotatePlugin } from './builtin/core-annotate';
 
 /** Register all built-in plugins */
 export function registerBuiltinPlugins() {
   pluginRegistry.register(eventToolsPlugin);
-  // API v2 (Task A3):
+  // API v2 (Task A3+):
   pluginRegistry.registerV2(coreDrawingPlugin);
   pluginRegistry.registerV2(coreModifyPlugin);
+  pluginRegistry.registerV2(coreAnnotatePlugin);
 }
diff --git a/frontend/tests/pilotTools.test.ts b/frontend/tests/pilotTools.test.ts
index a54a088..b76a1bf 100644
--- a/frontend/tests/pilotTools.test.ts
+++ b/frontend/tests/pilotTools.test.ts
@@ -6,6 +6,7 @@
 import { describe, it, expect, vi } from 'vitest';
 import { lineTool, coreDrawingPlugin } from '../src/plugins/builtin/core-drawing';
 import { selectTool, coreModifyPlugin } from '../src/plugins/builtin/core-modify';
+import { coreAnnotatePlugin } from '../src/plugins/builtin/core-annotate';
 import { CADDocument } from '../src/kernel/document/CADDocument';
 import { createInMemoryDoc } from './helpers/inMemoryDoc';
 import type { ToolPointerEvent, FullToolContext } from '../src/plugins/types';
@@ -199,6 +200,66 @@ describe('A4.3 pilot: polyline/polygon tools', () => {
   });
 });
 
+describe('A4.4 pilot: annotate tools', () => {
+  it('dimension: down→up committet mit x1..y2-Properties; undo entfernt', () => {
+    const { ydoc } = createInMemoryDoc();
+    const doc = new CADDocument(ydoc);
+    const ctx = makeCtx({ doc });
+    const dim = coreAnnotatePlugin.tools!.find((t) => t.manifest.id === 'dimension')!;
+
+    dim.handlers.down!(pe(0, 0), ctx);
+    dim.handlers.move!(pe(60, 0), ctx);   // Preview war da
+    expect(ctx.previews.length).toBe(1);
+    dim.handlers.up!(pe(60, 0), ctx);
+
+    const all = doc.getAllElements();
+    expect(all.length).toBe(1);
+    expect(all[0].type).toBe('dimension');
+    expect(all[0].x).toBe(30);                     // Mitte
+    expect(all[0].properties.x2).toBe(60);
+    expect(all[0].width).toBeCloseTo(60);          // dist als Breite wie Legacy
+
+    expect(doc.undo()).toBe(true);
+    expect(doc.getAllElements().length).toBe(0);
+  });
+
+  it('leader: übernimmt Text/fontSize-Konvention aus Legacy', () => {
+    const { ydoc } = createInMemoryDoc();
+    const doc = new CADDocument(ydoc);
+    const ctx = makeCtx({ doc });
+    const leader = coreAnnotatePlugin.tools!.find((t) => t.manifest.id === 'leader')!;
+
+    leader.handlers.down!(pe(10, 20), ctx);
+    leader.handlers.up!(pe(80, 90), ctx);
+
+    const all = doc.getAllElements();
+    expect(all.length).toBe(1);
+    expect(all[0].type).toBe('leader');
+    expect(all[0].properties.x1).toBe(10);
+    expect(all[0].properties.y2).toBe(90);
+    expect(all[0].properties.text).toBe('');
+    expect(all[0].properties.fontSize).toBe(12);
+  });
+
+  it('text: Einzelklick platziert leeres Textelement mit fontSize-Option', () => {
+    const { ydoc } = createInMemoryDoc();
+    const doc = new CADDocument(ydoc);
+    const ctx = makeCtx({ doc, options: { fontSize: 18 } });
+    const txt = coreAnnotatePlugin.tools!.find((t) => t.manifest.id === 'text')!;
+
+    txt.handlers.down!(pe(40, 70), ctx);   // kein up nötig — single-point tool
+
+    const all = doc.getAllElements();
+    expect(all.length).toBe(1);
+    expect(all[0].type).toBe('text');
+    expect(all[0].x).toBe(40);
+    expect(all[0].y).toBe(70);
+    expect(all[0].width).toBe(100);        // Legacy-Default-BBox
+    expect(all[0].properties.fontSize).toBe(18); // aus options statt Default 12
+    expect(all[0].properties.text).toBe('');
+  });
+});
+
 describe('A3 pilot: select tool', () => {
   function makeBridge(elements: CADElement[]) {
     let ids: string[] = [];