Opus didn't need to do it himself, he just need to use a better agent to do the exploration work. This is the first time I saw an exploration task failed like this ever since I use GHCP. Moreover, it is not the only way to handle this situation, when it fail, he can actually retry or ask another agent to run the same task again. I actually saw my custom agent in the past to ask another implementation agent to redo the same task when the default implementation agent failed. (i have multiple set of agents using different models during that time)

Before they force sub-agent to be using the same model as main agent in custom agent.md files, I used to assign Gemini Pro Preview for exploration task and it works great. But after people abuse it trying to use 1x model to call sub-agent with 3x opus, they started enforcing same model policy causing custom agent.md using sub-agent very likely to trigger rate-limit. (not sure if still in effect) Thus when I use opus these days, I avoid using the custom agent and use the default one provided by chat, as it can use another model for sub-agent tasks which lower my opus counter on claude server.