Six agents were running and I could not tell you what any of them did

Six coding agents were running. I could not tell you what any of them had done. Not roughly. Not approximately. The output was there, the files had changed, and the honest answer to "which one did that" was a shrug. Three questions in particular had no answer: which run burned the tokens, whether they genuinely ran at the same time or merely started together, and whether two of them had quietly edited the same file. That last one is the expensive question. An agent working on the wrong file looks exactly like an agent working on the right one, right up until you read the diff. The thing that was already true Every one of those runners writes a transcript to disk while it works. Claude Code does. So do Cursor, Codex, Gemini CLI, Copilot CLI and Kiro. The record of what happened was sitting in my home directory the entire time, in six different formats, none of which I had ever looked at. So runlanes does not wrap anything. There is no SDK, no instrumentation step, no account, and nothing to start before the run starts. It reads what the runner already wrote. The consequence is the part I did not expect to matter as much as it does: it works on runs that already finished. Most tools in this space need you to have decided, in advance, that this particular run was worth watching. This one can answer a question you only thought to ask afterwards. npx runlanes That opens a console on 127.0.0.1:4180 for whatever project you are standing in. There is no configuration file to write first. What it actually shows Now is every live session, across every runner it found, with what the main conversation spent against what it handed to subagents. On the session that motivated the whole thing, that split was 8.3 million tokens of conversation against 2.1 million delegated, which was not the ratio I would have guessed. The parallelism figure is the one I keep coming back to. Peak concurrency was four agents. The share of elapsed time where anything genuinely overlapped was 9% . Four