diff --git a/harness/pstack/claude-code/skills/show-me-your-work/scripts/log.sh b/harness/pstack/claude-code/skills/show-me-your-work/scripts/log.sh
index 052e53b7e..bca8a25f8 100755
--- a/harness/pstack/claude-code/skills/show-me-your-work/scripts/log.sh
+++ b/harness/pstack/claude-code/skills/show-me-your-work/scripts/log.sh
@@ -11,7 +11,7 @@ fi
 logfile="$1"
 shift
 
-logdir="$(dirname "$logfile")"
+logdir="$(dirname -- "$logfile")"
 if [ -n "$logdir" ] && [ "$logdir" != "." ] && [ ! -d "$logdir" ]; then
 	mkdir -p "$logdir"
 fi
diff --git a/harness/pstack/claude-code/skills/show-me-your-work/scripts/log.test.sh b/harness/pstack/claude-code/skills/show-me-your-work/scripts/log.test.sh
new file mode 100755
index 000000000..c56526462
--- /dev/null
+++ b/harness/pstack/claude-code/skills/show-me-your-work/scripts/log.test.sh
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+here="$(cd "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+work="$(mktemp -d)"
+trap 'rm -rf "$work"' EXIT
+
+(
+	cd "$work"
+	"$here/log.sh" -decisions.tsv plan choice why evidence result
+)
+
+test -f "$work/-decisions.tsv"
+test "$(wc -l < "$work/-decisions.tsv" | tr -d ' ')" -eq 2
diff --git a/pstack/skills/show-me-your-work/scripts/log.sh b/pstack/skills/show-me-your-work/scripts/log.sh
index 052e53b7e..bca8a25f8 100755
--- a/pstack/skills/show-me-your-work/scripts/log.sh
+++ b/pstack/skills/show-me-your-work/scripts/log.sh
@@ -11,7 +11,7 @@ fi
 logfile="$1"
 shift
 
-logdir="$(dirname "$logfile")"
+logdir="$(dirname -- "$logfile")"
 if [ -n "$logdir" ] && [ "$logdir" != "." ] && [ ! -d "$logdir" ]; then
 	mkdir -p "$logdir"
 fi
diff --git a/pstack/skills/show-me-your-work/scripts/log.test.sh b/pstack/skills/show-me-your-work/scripts/log.test.sh
new file mode 100755
index 000000000..c56526462
--- /dev/null
+++ b/pstack/skills/show-me-your-work/scripts/log.test.sh
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+here="$(cd "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+work="$(mktemp -d)"
+trap 'rm -rf "$work"' EXIT
+
+(
+	cd "$work"
+	"$here/log.sh" -decisions.tsv plan choice why evidence result
+)
+
+test -f "$work/-decisions.tsv"
+test "$(wc -l < "$work/-decisions.tsv" | tr -d ' ')" -eq 2