[blakec]

Yeah, but not a framework. I'm using Claude Code's hook system. 84 hooks across 15 event types.

Biggest thing I learned: don't let multiple hooks fire independently on the same event. I had seven on UserPromptSubmit, each reading stdin on their own. Two wrote to the same JSON state file. Concurrent writes = truncated JSON = every downstream hook breaks. One dispatcher per event running them sequentially from cached stdin fixed it. 200ms overhead per prompt, which you never notice.

The "multi-agent is worse than serial" take is true when agents share context. Stops being true when you give planning agents their own session (broad context, lots of file reads) and implementation agents their own (narrow task, full window). I didn't plan that separation. It just turned out that mixing both in one session made both worse.

No framework, no runtime. Just files. You can use one hook or eighty-four.