cron.add tool "invalid params" error despite valid schema JSON

Repo: openclaw/openclaw

Environment:

• OS: Linux 6.17.0-12-generic (sigma-box)
• Node: v24.13.0 (nvm)
• Model: xai/grok-4-1-fast
• Cron status: enabled, jobs:0, storePath /home/sigma/.openclaw/cron/jobs.json

Issue:
cron.add returns "invalid cron.add params: must have required property 'name'; must have required property 'schedule'; must have required property 'sessionTarget'; must have required property 'payload'"

Despite full schema-compliant JSON in param.

Works:

• cron status
• cron list (empty)
• cron wake (systemEvent fires to main)

Does not:

• cron add full job object

Example tool call:

<xai:function_call name=\"cron\">
<parameter name=\"action\">add