diff --git a/docs/concepts/agent.md b/docs/concepts/agent.md
index cbd3382c359..264359cdfe7 100644
--- a/docs/concepts/agent.md
+++ b/docs/concepts/agent.md
@@ -5,7 +5,10 @@ read_when:
 title: "Agent runtime"
 ---
 
-OpenClaw runs a single embedded agent runtime.
+OpenClaw runs a **single embedded agent runtime** — one agent process per
+Gateway, with its own workspace, bootstrap files, and session store. This page
+covers that runtime contract: what the workspace must contain, which files get
+injected, and how sessions bootstrap against it.
 
 ## Workspace (required)