After a workspace restart (HTTP /restart or programmatic RestartByID) and
re-registration, the platform sends a synthetic A2A message/send to the
workspace containing:
- restart timestamp
- previous session end timestamp + human duration
- env-var keys now available (keys only — never values)
The message is rendered in the format proposed in #19 and marked with
metadata.kind=restart_context so agents can detect and handle it
specifically if they choose.
Skip path: if the workspace doesn't re-register within 30s, log and drop.
The Restart HTTP response is unaffected by delivery success.
Layer 2 (user-defined restart_prompt via config.yaml / org.yaml) is
deferred — tracked as a separate follow-up issue.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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