Bug Report

Version: 2026.3.12 (6472949)

Summary:
The message tool with action=send fails validation with a buttons: must have required property 'buttons' error when buttons is not included in the call, even for plain text messages where no buttons are needed.

Steps to reproduce:

{
  "action": "send",
  "channel": "telegram",
  "target": "<chat_id>",
  "message": "Hello world"
}

Error:

Validation failed for tool "message":
  - buttons: must have required property 'buttons'

Workaround:
Passing "buttons": [] explicitly makes the call succeed.

Expected behavior:
buttons should be optional for plain action=send calls. It should not be a required field when sending a simple text message with no interactive components.

Impact:
Any agent-authored BOOT.md, cron, or skill that sends a plain notification via the message tool will fail without explicit documentation of this undocumented requirement. It's a footgun for anyone building automations.