diff --git a/AGENTS_mirko.md b/AGENTS_mirko.md
new file mode 100644
index 00000000..fd7a334a
--- /dev/null
+++ b/AGENTS_mirko.md
@@ -0,0 +1,15 @@
+# Personal notes — mirko
+
+Personal working notes for Claude Code sessions in this repo, for my own use across machines.
+Not project-wide guidance — nothing here applies to other contributors, and nothing else in
+this repo references or enforces it.
+
+## Repo ownership boundaries
+
+Root causes traced into BEC core (`bec_lib`/`bec_server`/`bec_ipython_client`, the `bec` repo)
+or into core `bec_widgets` are not mine to fix here — those are owned by their respective core
+teams. When an investigation in `csaxs_bec` turns up a bug whose fix belongs in one of those
+repos, write it up (a short report or plan) instead of implementing/committing it there.
+
+Fixes that land in `csaxs_bec` itself (beamline plugin code, widgets, device configs, scans)
+are mine to implement, commit, and push directly.