Whoa, I finally got the "Cross-Conversation Automatic Collaboration" working in Codex App.

A single conversation,
can periodically wake up another conversation to do work.
It will read the handoff file itself,
execute tasks,
write back the status.
The cross-conversation process is finally a closed loop.
Previously, cross-conversation collaboration was very troublesome.
You had to manually open another thread,
copy the context,
input the prompt,
wait for it to finish,
then move the results back to the main conversation.
Now, this has become an automated process.
When the main conversation advances a task,
if it finds that a certain step should be handed over to another business line,
it writes a handoff file.
It only includes a few items:
- Task ID
- Which stage it is currently at
- Which files the target conversation needs to read first
- What results to produce
- Completion conditions
- Red lines
Then the main conversation creates a short-term scheduled task.
The target conversation wakes up automatically at the scheduled time,
reads the handoff file,
executes the task,
writes the results back to the status file.
The main conversation wakes up again,
checks the completion conditions,
collects the results,
and continues to move forward.
Once this system is running,
conversations in Codex App are no longer just chat windows.
They are more like a set of schedulable work units:
one responsible for overall coordination,
one for strategy,
one for content,
one for engineering,
one for review.
More can be added later,
completely defined by your own business lines.
They communicate via file handoffs,
wake up through scheduled tasks,
and form a closed loop through status updates.
This might be my favorite way to use Codex App so far, bar none.