diff --git a/.mise/tasks/deobfuscate b/.mise/tasks/deobfuscate
index b7a1273..a112805 100755
--- a/.mise/tasks/deobfuscate
+++ b/.mise/tasks/deobfuscate
@@ -28,6 +28,10 @@ if [ -n "${usage_files:-}" ]; then
     arg="${arg#"${notes_dir}/"}"
     # Skip empty variadic defaults after xargs unquotes "''".
     [ -z "$arg" ] && continue
+    # Match basename's handling of trailing slashes without spawning it.
+    while [ -n "$arg" ] && [ "${arg%/}" != "$arg" ]; do
+      arg="${arg%/}"
+    done
     arg="${arg##*/}"
     ARGS+=("$arg")
   done < <(printf '%s' "${usage_files}" | xargs printf '%s\n')
diff --git a/README.md b/README.md
index 2276a2f..12a4224 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 
 **Collective memory, encrypted.**
 
-[![tests: 422](https://img.shields.io/badge/tests-422-brightgreen?style=flat)](test/)
+[![tests: 423](https://img.shields.io/badge/tests-423-brightgreen?style=flat)](test/)
 ![lints: 8](https://img.shields.io/badge/lints-8-blue?style=flat)
 [![license: MIT](https://img.shields.io/badge/license-MIT-blue?style=flat)](LICENSE)
 
diff --git a/test/deobfuscate.bats b/test/deobfuscate.bats
index 3b13287..e5b5c75 100644
--- a/test/deobfuscate.bats
+++ b/test/deobfuscate.bats
@@ -239,6 +239,21 @@ BASH
 }
 
 
+@test "scoped deobfuscate keeps a trailing-slash path scoped" {
+  notes obfuscate
+
+  local alpha_id beta_id
+  alpha_id=$(grep 'alpha.md' "$NOTES_CALLER_PWD/notes/.manifest" | cut -f1)
+  beta_id=$(grep 'beta.md' "$NOTES_CALLER_PWD/notes/.manifest" | cut -f1)
+
+  notes deobfuscate "notes/$alpha_id/"
+
+  [ -f "$NOTES_CALLER_PWD/notes/alpha.md" ]
+  [ -f "$NOTES_CALLER_PWD/notes/$beta_id" ]
+  [ ! -f "$NOTES_CALLER_PWD/notes/beta.md" ]
+}
+
+
 @test "deobfuscate with args warns on unknown ID" {
   notes obfuscate