Things I've built, mostly so I'd want to use them.

diffwarden is a small CLI that lets a coding agent request a review of local changes — uncommitted work, a branch diff, a single commit, or a repo-scoped instruction — and get back Markdown or structured JSON findings. The CLI owns target resolution, prompt assembly, parsing, schema validation, and rendering; individual reviewer SDKs and CLIs sit behind adapters.

It runs one reviewer or a set (Cursor, Claude, Pi, Droid, Codex, Gemini, and more), dedups and aggregates their findings, and streams typed NDJSON events for agents and CI. Read-only by default — publishing comments to external services is deliberately out of scope — and it ships an installable agent skill so other repos can call it.