diff --git a/.claude/scripts/migrate-identity.sh b/.claude/scripts/migrate-identity.sh
index 872d5ed..f14ebc6 100755
--- a/.claude/scripts/migrate-identity.sh
+++ b/.claude/scripts/migrate-identity.sh
@@ -74,10 +74,13 @@ fi
 echo ""
 echo "[INFO] Updating identity.json..."
 
-# Read existing, add new fields, write back
-python3 -c "
+# Read existing, add new fields, write back.
+# On Windows, native Python can't open Git Bash POSIX paths (/d/...); convert to a
+# drive-letter/forward-slash path for the interpreter. No-op (falls back) elsewhere.
+IDENTITY_PATH_PY=$(cygpath -m "$IDENTITY_PATH" 2>/dev/null || echo "$IDENTITY_PATH")
+"$PYTHON_CMD" -c "
 import json, sys
-with open('$IDENTITY_PATH', 'r') as f:
+with open('$IDENTITY_PATH_PY', 'r') as f:
     data = json.load(f)
 
 # Add new fields if not present
@@ -98,7 +101,7 @@ if 'architecture' not in data:
 
 data['last_updated'] = '$(date -u +"%Y-%m-%dT%H:%M:%SZ")'
 
-with open('$IDENTITY_PATH', 'w') as f:
+with open('$IDENTITY_PATH_PY', 'w') as f:
     json.dump(data, f, indent=2)
     f.write('\n')