fix: dispose races, tunnel guards, retry on stale

test/unit/tools/connections.test.ts

@@ -6,6 +6,7 @@ import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { createRegistry } from '../../../src/config/registry.js'
 import { writeStore } from '../../../src/config/store.js'
 import type { ConnectionConfig } from '../../../src/config/types.js'
+import { DriverDisposedError } from '../../../src/db/driver.js'
 import { registerConnectionTools } from '../../../src/tools/connections.js'
 import { callTool, connectClient, type FakeManager, fakeManager } from '../helpers.js'
 
@@ -147,6 +148,24 @@ describe('connection tools', () => {
         expect(typeof payload.latencyMs).toBe('number')
     })
 
+    it('test_connection retries once when the driver was disposed under it', async () => {
+        const serverVersion = vi
+            .fn()
+            .mockRejectedValueOnce(new DriverDisposedError())
+            .mockResolvedValueOnce('17.2')
+        manager.get.mockResolvedValue({
+            driver: { serverVersion },
+            config: conn('existing'),
+            source: 'store'
+        })
+        const response = await callTool(client, 'test_connection', { name: 'existing' })
+        expect(response.isError).toBe(false)
+        const payload = response.json() as Record<string, unknown>
+        expect(payload.ok).toBe(true)
+        expect(payload.version).toBe('17.2')
+        expect(manager.get).toHaveBeenCalledTimes(2)
+    })
+
     it('test_connection formats driver failures', async () => {
         manager.get.mockResolvedValue({
             driver: {