fix(mcp): treat UnauthorizedError as disconnected in service discovery paths

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: waleedlatif1

apps/sim/lib/mcp/service.ts

@@ -2,6 +2,7 @@
  * MCP Service - Clean stateless service for MCP operations
  */
 
+import { UnauthorizedError } from '@modelcontextprotocol/sdk/client/auth.js'
 import { db } from '@sim/db'
 import { mcpServers } from '@sim/db/schema'
 import { createLogger } from '@sim/logger'
@@ -407,8 +408,11 @@ class McpService {
               result.value.tools.length
             )
           )
-        } else if (result.reason instanceof McpOauthAuthorizationRequiredError) {
-          // Pending user authorization — not a failure. Leave status as-is.
+        } else if (
+          result.reason instanceof McpOauthAuthorizationRequiredError ||
+          result.reason instanceof UnauthorizedError
+        ) {
+          // Pending user authorization or expired refresh — not a hard failure.
           logger.info(`[${requestId}] Skipping server ${server.name}: OAuth authorization pending`)
         } else {
           failedCount++
@@ -539,7 +543,10 @@ class McpService {
             error: undefined,
           })
         } catch (error) {
-          if (error instanceof McpOauthAuthorizationRequiredError) {
+          if (
+            error instanceof McpOauthAuthorizationRequiredError ||
+            error instanceof UnauthorizedError
+          ) {
             summaries.push({
               id: config.id,
               name: config.name,