update skill

postmessage/SKILL.md

@@ -11,7 +11,7 @@ Post every message must get credential first, then post message via `xh` command
 ```shell
 xh --ignore-stdin POST 'https://play.hatter.me/message/hangoutsWebhook.jsonp' \
    Content-Type:application/json \
-   token==$(echo '{"protocolVersion": 1, "provider": "hattersecrets", "ids": ["post-message-token"]}' | openclaw-secret.ts  | jq '.values["post-message-token"]' -r) \
+   token==$(openclaw-secret.ts --direct-output --id post-message-token) \
    msgtype=text \
    'text[content]=TEXT_MESSAGE'
 ```