diff --git a/docs/agent-log.md b/docs/agent-log.md
index 02e1bbb..de387c2 100644
--- a/docs/agent-log.md
+++ b/docs/agent-log.md
@@ -4,6 +4,13 @@ What agents have done, newest first. Add an entry for every piece of work: the d
 note or request it was for, what changed, the files touched, the tests run, and anything left
 open or not verified. Keep each entry short; the git history has the details.
 
+## 2026-10-27: t65 Rust conversion added to Todo (Claude Code)
+
+- Owner request: a task to convert the game to Rust for performance, after the base game is more
+  playable (sooner if performance becomes a problem). Subtasks: settle the scope (whole game or the
+  hot sim code; WebAssembly or native), profile for a baseline, keep tests and saves working. No
+  code changed.
+
 ## 2026-10-27: Shift-drag draws a line for transport pieces (Claude Code)
 
 - Owner request: Shift shouldn't fill a rectangle for belts, conveyors and similar. New