Forkline is a replay-first tracing and diffing library for agentic AI workflows that lets you deterministically reproduce, fork, and compare agent runs to find exactly where behavior diverged.

A reusable workflow engine that executes workflows defined in JSON, with deterministic replay and an event log.

Spec‑first, replayable agent coordination engine with append‑only traces, determinism, and 2026‑ready engineering practices.