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-rw-r--r--.agents/skills/pardes-9p/SKILL.md3
1 files changed, 2 insertions, 1 deletions
diff --git a/.agents/skills/pardes-9p/SKILL.md b/.agents/skills/pardes-9p/SKILL.md
index feb4f703..5e79a470 100644
--- a/.agents/skills/pardes-9p/SKILL.md
+++ b/.agents/skills/pardes-9p/SKILL.md
@@ -257,7 +257,8 @@ the address comes back to where it began, or set `limit`.
a reserved zero, the dirty flag, the width in cells, the font and the tab
width, then `current` or `notcurrent` — and takes `get` (reload from disk),
`lock`/`unlock`, and any builtin that acts on a pane (`Del`, `Save f`,
-`Collapse`). A `lock` another open holds fails at once with `file in use`
+`Collapse`, `Undo`/`Redo`: 256 steps; with none left they say so, and the
+write succeeds). A `lock` another open holds fails at once with `file in use`
(EBUSY): retry it. Session builtins and settings go to the root `ctl`, which reads
back every setting in the syntax it takes. A ctl write is checked whole
first and refused as `unknown control message "X"` (EINVAL) and the like,