moirae

You just watched five Raft nodes lose their network for two seconds. The two on the wrong side of the wall tried twelve times to elect a leader and never could — every vote request died at the wall. The three on the right side kept theirs. When the wall came down, one election settled it, and a node that crashed came back with its log intact.

This is v0: one protocol (Raft), no trace shrinking, no Byzantine faults, no membership changes, no pre-vote, nothing hosted. If you arrived expecting Antithesis, this is the small, readable, TypeScript end of that idea — not a replacement for it.

npx moirae demo

runs that scenario on your machine, prints what happened, writes moirae-demo.jsonl, and opens it in the studio. One package, no dependencies, nothing to build.

npx moirae replay some-trace.jsonl

opens any trace the engine wrote. A trace replays byte for byte on any machine.

Source, documentation, and the engine as a library (moirae-core, moirae-protocols): https://github.com/pchrysostomou/moirae. Apache-2.0.