fix: manager races, shutdown order, tool bounds

test/unit/tools/connections.test.ts

@@ -73,6 +73,20 @@ describe('connection tools', () => {
         ])
     })
 
+    it('add_connection rejects unknown fields', async () => {
+        const response = await callTool(client, 'add_connection', {
+            name: 'typo',
+            type: 'postgres',
+            host: 'h',
+            user: 'u',
+            readOnly: true
+        })
+        expect(response.isError).toBe(true)
+        const list = await callTool(client, 'list_connections')
+        const names = (list.json() as Array<{ name: string }>).map((c) => c.name)
+        expect(names).not.toContain('typo')
+    })
+
     it('add_connection rejects duplicates with isError', async () => {
         const response = await callTool(client, 'add_connection', {
             name: 'existing',