improvement(mcp): subscribe settings page to the live push, lean on it over re-probing

The list_changed → SSE push pipeline was already wired end-to-end but only
mounted in the workflow-editor tool picker. Subscribe the settings MCP page to
the same shared, reference-counted EventSource so tool changes reflect in real
time there too — the reference-client model (discover once, refresh on push).

With push now active on the settings page, raise MCP_SERVER_TOOLS_STALE_TIME
from 30s to 5min (matching the server-side cache TTL) so revisiting the page
leans on push + stored state instead of re-probing every connected server.
There is no background poll (no refetchInterval) — this only affects
refetch-on-visit-if-stale; real changes still arrive instantly via push.

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/settings/components/mcp/mcp.tsx

@@ -39,6 +39,7 @@ import {
   useDeleteMcpServer,
   useForceRefreshMcpTools,
   useMcpServers,
+  useMcpToolsEvents,
   useMcpToolsQuery,
   useRefreshMcpServer,
   useStoredMcpTools,
@@ -195,6 +196,9 @@ export function MCP() {
   } = useMcpServers(workspaceId)
   const { data: mcpToolsData = [], toolsStateByServer } = useMcpToolsQuery(workspaceId)
   const { data: storedTools = [], refetch: refetchStoredTools } = useStoredMcpTools(workspaceId)
+  // Real-time refresh via the shared list_changed → SSE push (same subscription the workflow
+  // editor uses), so tool changes reflect here without re-probing on every visit.
+  useMcpToolsEvents(workspaceId)
   const forceRefreshToolsMutation = useForceRefreshMcpTools()
   const forceRefreshTools = forceRefreshToolsMutation.mutate
   const createServerMutation = useCreateMcpServer()

apps/sim/hooks/queries/mcp.ts

@@ -42,7 +42,13 @@ const logger = createLogger('McpQueries')
 export type { McpServerStatusConfig, McpTool, StoredMcpTool }
 
 export const MCP_SERVER_LIST_STALE_TIME = 60 * 1000
-export const MCP_SERVER_TOOLS_STALE_TIME = 30 * 1000
+/**
+ * Tool discovery is kept fresh by the `list_changed` → SSE push (see `useMcpToolsEvents`),
+ * so the query only needs a re-probe-on-visit fallback for servers without push. Matches the
+ * server-side cache TTL (`MCP_CONSTANTS.CACHE_TIMEOUT`) — no reference MCP client re-probes
+ * more often than its cache; real changes arrive via push regardless of this value.
+ */
+export const MCP_SERVER_TOOLS_STALE_TIME = 5 * 60 * 1000
 export const MCP_STORED_TOOL_LIST_STALE_TIME = 60 * 1000
 export const MCP_ALLOWED_DOMAINS_STALE_TIME = 5 * 60 * 1000