diff --git a/backend/src/mcp/register-note-tools.test.ts b/backend/src/mcp/register-note-tools.test.ts
new file mode 100644
index 0000000..ab2acd2
--- /dev/null
+++ b/backend/src/mcp/register-note-tools.test.ts
@@ -0,0 +1,61 @@
+import { describe, expect, it, vi } from 'vitest';
+import { NOTES_MCP_TOOL_NAMES } from './note-tool-contracts.js';
+
+const { executableToolsMock, toolNames } = vi.hoisted(() => ({
+  toolNames: {
+    list: 'notes.notes.list',
+    createDraft: 'notes.notes.create_draft',
+  },
+  executableToolsMock: [
+    {
+      name: 'notes.notes.list',
+      description: 'List notes',
+      requiredRole: 'viewer' as const,
+      inputSchema: { safeParse: vi.fn() },
+      execute: vi.fn(async () => ({ ok: true })),
+      readOnly: true,
+    },
+    {
+      name: 'notes.notes.create_draft',
+      description: 'Create draft',
+      requiredRole: 'admin' as const,
+      inputSchema: { safeParse: vi.fn() },
+      execute: vi.fn(async () => ({ ok: true })),
+      readOnly: false,
+    },
+  ],
+}));
+
+vi.mock('./note-tools.js', () => ({
+  NotesExecutableMcpTools: executableToolsMock,
+}));
+
+import { getNotesMcpToolsForRegistration, registerNotesMcpTools } from './register-note-tools.js';
+
+describe('register note tools adapter', () => {
+  it('returns a registration-friendly tool list', () => {
+    const tools = getNotesMcpToolsForRegistration();
+
+    expect(tools).toHaveLength(2);
+    expect(tools.map(tool => tool.name)).toEqual([
+      toolNames.list,
+      toolNames.createDraft,
+    ]);
+  });
+
+  it('registers every executable tool through the provided callback', () => {
+    const registerTool = vi.fn();
+
+    registerNotesMcpTools(registerTool);
+
+    expect(registerTool).toHaveBeenCalledTimes(2);
+    expect(registerTool).toHaveBeenNthCalledWith(
+      1,
+      expect.objectContaining({ name: toolNames.list, requiredRole: 'viewer' })
+    );
+    expect(registerTool).toHaveBeenNthCalledWith(
+      2,
+      expect.objectContaining({ name: toolNames.createDraft, requiredRole: 'admin' })
+    );
+  });
+});
diff --git a/docs/roadmaps/05_MCP_AGENT_ROADMAP.md b/docs/roadmaps/05_MCP_AGENT_ROADMAP.md
index 6ab85cf..a902b25 100644
--- a/docs/roadmaps/05_MCP_AGENT_ROADMAP.md
+++ b/docs/roadmaps/05_MCP_AGENT_ROADMAP.md
@@ -71,6 +71,7 @@ Parent: `docs/ROADMAP.md`
   - an adapter that exports the note tools in a shape compatible with shared `mcp-server` registration
   - a clear product-side handoff point for future shared-server wiring
   - backend verification still passing after the adapter layer was introduced
+  - explicit adapter tests now verify exported tool shape and registration callback coverage
 - 2026-03-10 — Product-side MCP hardening advanced:
   - executable tools now reject mismatched `productId` scope at runtime
   - regression coverage now asserts mutating calls do not persist when scope is invalid