TLDR: I had Claude build me a tool that uses Codex as subagents in the same format they are used in /workflows and it’s very decent. I use a context MCP that I steer Claude towards on basically any task. Claude built it, been iteratively improving it ever since. It incorporates tool calls for things that I need to do quite often that I have delegated to Claude. I knew I wasn’t going to be able to maintain working with Fable full time from a pure cost perspective, usage limits reset for me Thursday lunchtime, I managed to use 100% of my weekly limit on Wednesday - after they gave us the reset. And on Thursday morning spent £1k in additional usage. All amazing work but would break the budget, when the Thursday reset dropped I had already started using opus again. One of the things I did when Fable dropped was to get it to improve the MCP to make it useful for lower capability models (opus/sonnet) and it did a fucking amazing job. I am rambling here so I won’t go into the specifics. But I also got it to explain what makes dynamic workflows work so well compared to the old subagent pattern. And it gave me a pretty good rundown including the JSON contract, what the parent model actually “sees/does” whilst the workflow is running (nothing) and the format of the response. Today I got Opus to create an MCP tool that uses codex to execute workflows and the results are pretty insane. The prompt goes “use the MCP fleet to fan out and do x” Opus calls the tool, creates a multi window tmux session and initiates Codex agents with the exact system prompt it would provide to opus or sonnet subagents. Codex pings Opus when done with the JSON response, opus collates and adversarially reviews the work/findings. If you use both then you know Codex is very good at executing opus instructions/plans anyway. Codex 5.5 is a very capable model in its own right but the harness isn’t there yet and it’s hamstrung by it’s context window. I’m super hyped this works as well as it does, since when you need opus level execution it takes an age to do. GPT 5.5 xhigh in fast mode is just an elite level Claude subagent. And Claude can actively manage them rather than just spawning them and idling whilst burning tokens polling for responses. All in all very nice. Sure I’m not the first to do this but it’s a win for me! submitted by /u/muad_dib_the_maker
Originally posted by u/muad_dib_the_maker on r/ClaudeCode