Replace "when the agent session ends" with detailed description it means agent execution stopping, not the chat session stopping.

Author: okko

docs/agents/reference/hooks-reference.md

@@ -166,7 +166,9 @@ The `SessionStart` hook can inject additional context into the agent's conversat
 
 ## Stop
 
-The `Stop` hook fires when the agent session ends. When scoped to a custom agent, the `Stop` hook is also treated as `SubagentStop`.
+The `Stop` hook fires when the current agent execution stops. When scoped to a custom agent, the `Stop` hook is also treated as `SubagentStop`.
+
+The hook firing does not indicate stopping of a session or that the session has become inactive.
 
 ### Stop input