diff --git a/src/mcp/server.ts b/src/mcp/server.ts
index 85bb447..c2efc82 100644
--- a/src/mcp/server.ts
+++ b/src/mcp/server.ts
@@ -262,9 +262,26 @@ export class SeaTableMCPServer {
 
         const start = Date.now()
         toolCallsByToolTotal.inc({ tool: toolName })
+        // Read inside runWithBase(): once the scope has returned, the AsyncLocalStorage
+        // store is gone and ContextualClient cannot resolve a base in multi-base mode.
+        let baseInfo: { dtableUuid?: string; appName?: string } = {}
+        const captureBaseInfo = () => {
+            try {
+                baseInfo = this.client.getBaseInfo?.() ?? {}
+            } catch {
+                // Base could not be resolved (e.g. missing or unknown "base" argument);
+                // the log line then simply omits the base fields.
+            }
+        }
         try {
             // Wrap handler to support thread-safe multi-base routing via AsyncLocalStorage
-            const runHandler = () => tool.handler(request.params.arguments)
+            const runHandler = async () => {
+                try {
+                    return await tool.handler(request.params.arguments)
+                } finally {
+                    captureBaseInfo()
+                }
+            }
             const result = this.contextualClient
                 ? await this.contextualClient.runWithBase(
                     (request.params.arguments as Record<string, unknown> | undefined)?.base as string | undefined,
@@ -273,7 +290,6 @@ export class SeaTableMCPServer {
                 : await runHandler()
             const durationMs = Date.now() - start
             const durationSec = durationMs / 1000
-            const baseInfo = this.client.getBaseInfo?.() ?? {}
             logger.info({
                 ...logCtx,
                 ...(baseInfo.dtableUuid && { dtable_uuid: baseInfo.dtableUuid }),
@@ -286,7 +302,6 @@ export class SeaTableMCPServer {
         } catch (error) {
             const durationMs = Date.now() - start
             const durationSec = durationMs / 1000
-            const baseInfo = this.client.getBaseInfo?.() ?? {}
             const errorCode = (error as CodedError)?.code
             const isClientError = typeof errorCode === 'string' && CLIENT_ERROR_CODES.has(errorCode)
 
diff --git a/tests/server.spec.ts b/tests/server.spec.ts
index 09504c6..3f63a9e 100644
--- a/tests/server.spec.ts
+++ b/tests/server.spec.ts
@@ -1,10 +1,12 @@
-import { beforeAll, describe, expect, it } from 'vitest'
+import { beforeAll, describe, expect, it, vi } from 'vitest'
 
 import { buildServer, getStaticToolDefinitions, SeaTableMCPServer } from '../src/mcp/server'
 import { registerEchoArgs } from '../src/mcp/tools/echoArgs'
 import { registerPingSeatable } from '../src/mcp/tools/pingSeatable'
 import type { ClientLike } from '../src/mcp/tools/types'
+import { ContextualClient } from '../src/seatable/contextualClient'
 import { MockSeaTableClient } from '../src/seatable/mockClient'
+import { logger } from '../src/logger'
 
 beforeAll(() => {
     process.env.SEATABLE_SERVER_URL = 'http://localhost'
@@ -37,6 +39,29 @@ function getToolNames(debug: boolean): string[] {
     return names
 }
 
+/** Registry with one client per base, mimicking ClientRegistry for multi-base tests */
+function createMultiBaseRegistry(baseNames: string[]) {
+    const clients = new Map<string, ClientLike>()
+    for (const name of baseNames) {
+        clients.set(name, {
+            getBaseInfo: () => ({ dtableUuid: `uuid_${name}`, appName: `app_${name}` }),
+            getMetadata: async () => ({ tables: [{ _id: `tbl_${name}`, name: `Table_${name}`, columns: [] }] }),
+        } as unknown as ClientLike)
+    }
+    return {
+        baseNames,
+        isMultiBase: baseNames.length > 1,
+        resolve(baseName?: string): ClientLike {
+            if (!baseName) {
+                throw new Error(`Multiple bases available (${baseNames.join(', ')}). Specify "base" parameter.`)
+            }
+            const client = clients.get(baseName)
+            if (!client) throw new Error(`Unknown base "${baseName}". Available: ${baseNames.join(', ')}`)
+            return client
+        },
+    }
+}
+
 describe('SeaTableMCPServer', () => {
     let server: SeaTableMCPServer
 
@@ -113,6 +138,41 @@ describe('SeaTableMCPServer', () => {
         expect(names).toContain('echo_args')
     })
 
+    it('handleCallTool succeeds in multi-base mode with two bases', async () => {
+        const registry = createMultiBaseRegistry(['CRM', 'Projects'])
+        const contextualClient = new ContextualClient(registry as any)
+        const multiBaseServer = new SeaTableMCPServer(contextualClient as unknown as ClientLike, {
+            contextualClient,
+            baseNames: registry.baseNames,
+        })
+
+        const result = await callTool(multiBaseServer, 'list_tables', { base: 'CRM' })
+        expect(result.isError).toBeUndefined()
+        expect(result.content[0].text).toContain('Table_CRM')
+    })
+
+    it('logs base info of the resolved base in multi-base mode', async () => {
+        const registry = createMultiBaseRegistry(['CRM', 'Projects'])
+        const contextualClient = new ContextualClient(registry as any)
+        const multiBaseServer = new SeaTableMCPServer(contextualClient as unknown as ClientLike, {
+            contextualClient,
+            baseNames: registry.baseNames,
+        })
+
+        const infoSpy = vi.spyOn(logger, 'info')
+        let calls: unknown[][]
+        try {
+            await callTool(multiBaseServer, 'list_tables', { base: 'Projects' })
+            calls = infoSpy.mock.calls.map((call) => [...call])
+        } finally {
+            infoSpy.mockRestore()
+        }
+
+        const completed = calls.find((call) => call[1] === 'Tool call completed') as [Record<string, unknown>, string] | undefined
+        expect(completed).toBeDefined()
+        expect(completed![0]).toMatchObject({ dtable_uuid: 'uuid_Projects', app_name: 'app_Projects' })
+    })
+
     it('handleListTools in multi-base mode does NOT inject base into list_bases', async () => {
         const mockClient = new MockSeaTableClient() as unknown as ClientLike
         const multiBaseServer = new SeaTableMCPServer(mockClient, {