perf(cli): stop eager MCP discovery from blocking agent-capable startup

cli.py

@@ -787,8 +787,10 @@ def AIAgent(*args, **kwargs):
 
 
 def get_tool_definitions(*args, **kwargs):
+    from hermes_cli.mcp_startup import wait_for_mcp_discovery
     from model_tools import get_tool_definitions as _get_tool_definitions
 
+    wait_for_mcp_discovery()
     return _get_tool_definitions(*args, **kwargs)
 
 
@@ -896,9 +898,12 @@ def _prepare_deferred_agent_startup() -> None:
             exc_info=True,
         )
     try:
-        from tools.mcp_tool import discover_mcp_tools
+        from hermes_cli.mcp_startup import start_background_mcp_discovery
 
-        discover_mcp_tools()
+        start_background_mcp_discovery(
+            logger=logger,
+            thread_name="termux-cli-mcp-discovery",
+        )
     except Exception:
         logger.debug(
             "MCP tool discovery failed at deferred CLI startup",
@@ -4871,6 +4876,10 @@ class HermesCLI:
         if not self._ensure_runtime_credentials():
             return False
 
+        from hermes_cli.mcp_startup import wait_for_mcp_discovery
+
+        wait_for_mcp_discovery()
+
         # Initialize SQLite session store for CLI sessions (if not already done in __init__)
         if self._session_db is None:
             try: