diff --git a/docs/AGENTS.default.md b/docs/AGENTS.default.md
index 161e6c5f5..5d1b2b11c 100644
--- a/docs/AGENTS.default.md
+++ b/docs/AGENTS.default.md
@@ -109,6 +109,7 @@ git commit -m "Add Clawd workspace"
 - Prefer the `clawdis` CLI for scripting; mac app handles permissions.
 - Run installs from the Skills tab; it hides the button if a binary is already present.
 - Keep heartbeats enabled so the assistant can schedule reminders, monitor inboxes, and trigger camera captures.
+- Canvas UI runs full-screen with native overlays. Avoid placing critical controls in the top-left/top-right/bottom edges; add explicit gutters in the layout and don’t rely on safe-area insets.
 - For browser-driven verification, use `clawdis browser` (tabs/status/screenshot) with the clawd-managed Chrome profile.
 - For DOM inspection, use `clawdis browser eval|query|dom|snapshot` (and `--json`/`--out` when you need machine output).
 - For interactions, use `clawdis browser click|type|hover|drag|select|upload|press|wait|navigate|back|evaluate|run`.
diff --git a/skills/clawdis-browser/SKILL.md b/skills/clawdis-browser/SKILL.md
index 8a6136497..912e758b0 100644
--- a/skills/clawdis-browser/SKILL.md
+++ b/skills/clawdis-browser/SKILL.md
@@ -30,3 +30,4 @@ Actions
 Notes
 - This is a dedicated profile; do not use the user's personal browser.
 - If disabled, ask the user to enable `browser.enabled` in `~/.clawdis/clawdis.json`.
+- Canvas UI is full-screen with native overlays. Keep critical controls out of the top-left/top-right/bottom edges (leave explicit gutters ~28px top, ~16px sides, ~20px bottom). Do not rely on safe-area insets.