An @mention by an agent wakes the mentioned teammate by creating a task
run, and the woken agent's reply can mention back, an unbounded A->B->A
loop whose only backstop was the per-provider monthly request cap (which,
once tripped, fails every agent on that provider). Before enriching agent
conversation this had to be made safe.
Cap the agent-authored messages a thread may accumulate since its last
human/board message; past the cap, agent-triggered wakes pause until a
person re-engages. A human message always wakes mentions and resets the
budget. Counted from chat_messages, so no schema change.
ZacharyZhang-NY
c8de72c810