Problem

When a cron job (sessionTarget="isolated") finishes and its announce delivery sends the result to the same Telegram user, it triggers:

EmbeddedAttemptSessionTakeoverError: session file changed while embedded prompt lock was released

Root cause

1. User sends a Telegram message -> session file locked for processing
2. LLM call is made -> embedded prompt lock temporarily released
3. Cron job completes -> announce delivery writes to the same Telegram session (delivery.to = same user ID)
4. Session file changes while the original LLM call is still in flight
5. LLM returns -> tries to resume -> detects file changed -> takeover error

Relevant config

Cron job delivery:
{
"sessionTarget": "isolated",
"delivery": {
"mode": "announce",
"channel": "telegram",
"to": "8790460537"
}
}

Expected behavior

Cron announce delivery should not modify the active user session file, or should use a separate write path that doesn't conflict with the embedded agent's prompt lock.

Environment

• OpenClaw 2026.5.18
• Telegram channel
• Isolated cron jobs with announce delivery