diff --git a/SKILL.md b/SKILL.md
index 27fb728..a625370 100644
--- a/SKILL.md
+++ b/SKILL.md
@@ -20,20 +20,24 @@ Create a backup of OpenClaw configuration.
 ```
 
 **Parameters:**
-- `--scope <scope>` - Backup scope: `config`, `config+session`, `config+session+workspace`
+- `--scope <scope>` - Backup scope: `config`, `config+session`, `config+session+workspace`, `minimal`
 - `--source <source>` - Backup source: `direct` or `native`
 - `--reason <reason>` - Optional reason for the backup
 
+**Scope behavior:**
+
+| Scope | Description |
+|-------|-------------|
+| `config` | Configuration only (openclaw.json, credentials) |
+| `config+session` | Configuration + sessions directory |
+| `config+session+workspace` | Full backup including workspace |
+| `minimal` | Metadata-only checkpoint (stores backup ID, timestamp, scope, reason in SQLite; no file contents) — intended as a lightweight marker for tracking operations rather than a restorable backup |
+
 **Source behavior:**
 - `direct` reads OpenClaw files directly into OCBS chunk storage
 - `native` runs `openclaw backup create`, extracts the archive, then imports it into OCBS chunk storage
 - If the native CLI is unavailable, OCBS falls back to the direct source
 
-**Scope notes:**
-- `config` backs up OpenClaw configuration and credentials.
-- `config+session` adds OpenClaw session state.
-- `config+session+workspace` includes the full workspace.
-
 ### restore
 Restore from a backup or checkpoint.
 
@@ -223,4 +227,4 @@ ocbs integration setup-heartbeat --enabled --timeout 30
 This was fixed in v0.1.0 with batch processing. Restore now handles large backups (13,000+ files) without hitting file descriptor limits.
 
 ### Schema mismatch
-The `serve_records` table uses `checkpoint_id` (not `backup_id`) to match checkpoint table schema.
+The `serve_records` table uses `checkpoint_id` (not `backup_id`) to match checkpoint table schema.
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index c64cdb8..96e85bf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
-clawhub = "clawhub>=0.1.0"
+clawhub = ["clawhub>=0.1.0"]
 
 [project.scripts]
 ocbs = "ocbs.cli:main"