Runlanes tool lets developers monitor multiple AI coding agents from local logs

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A developer built Runlanes, a lightweight CLI tool that reads existing transcript logs written by AI coding agents like Claude and Kiro to visualise what each agent did, which files it touched, and how much time and compute it consumed. The tool requires no SDK, no instrumentation, and makes no outbound network calls, binding only to localhost on port 4180. It works retrospectively on already-completed runs, not just live sessions, making it useful for post-hoc audits of parallel agent workflows. The developer found that despite running four agents simultaneously, actual peak concurrency was just 9% of wall-clock time, highlighting idle overlap as a hidden cost. Released as an MIT-licensed npm package under the name Runlanes, it has zero runtime dependencies and 95 tests, and works by reading log data already stored on the user's disk.

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