Mirrors vs Pacwich

Mirrors rebuilds the systems your AI agents call and replays real sessions against every prompt, tool, or model change before it reaches production.

Monorepo tooling that works on top of Bun, npm, and pnpm workspaces, with a CLI and TypeScript API.

About Mirrors

Mirrors rebuilds the systems your AI agents call and replays real sessions against every prompt, tool, or model change before it reaches production. Schema, seed data, and tool behavior mined into a runnable copy of the systems your agent calls, including the internal tools nobody will give you a test instance of. Every change is tested against past sessions before it merges. The Replay screen diffs each recorded production call against its counterpart in the environment, so you can see where the two agree and where they drift before you trust it with a merge gate.

About Pacwich

Monorepo tooling that works on top of Bun, npm, and pnpm workspaces, with a CLI and TypeScript API. This package is the continuation of the original, now deprecated, bun-workspaces package. bun-workspaces users can expect minimal to no changes on average. CLI global install: Your pacwich command will still resolve to a local install when available. bun add -g pacwich # Print help for installing completions pacwich completion # Attempt to automatically install completions for your shell pacwich completion install Local install: Note the pacwich command works in your package.json scripts even without a global install.