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v0.2.0 — review a PR without installing anything

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@gwicho38 gwicho38 released this 02 Sep 16:00
· 11 commits to main since this release
Immutable release. Only release title and notes can be modified.
v0.2.0
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Learn about vigilant mode.

0.2.0 — review a pull request without installing anything

2026-09-02 · 28 commits since v0.1.0 (2026-07-23) · 31 files changed, +4005 / −218

0.1.0 was a local server that drove the gh and claude CLIs. 0.2.0 adds a hosted
build that needs neither: open a URL, paste a PR, and a code model runs on your own
GPU inside the tab. Nothing is sent to a server, and there is no key to buy.

https://gwicho38.github.io/prview/

Review with no install and no API key

  • The hosted site. scripts/build_pages.py stages the real core.py, order.py
    and behaviors.py into a static build and runs them in Pyodide, so parsing,
    ordering and prompt-building have one implementation and one test suite across both
    builds. Review state lives in localStorage; the PR comes from the GitHub API.
  • A model in your browser. The in-browser AI engine runs Qwen2.5-Coder or
    Phi-4-mini through WebLLM on WebGPU, in a worker so the diff pane never freezes.
    Weights download once from the MLC CDN and are then served from the browser cache.
  • Private repositories. Paste a GitHub token in the bar at the top; it is verified
    against /user and attributed to an account before any PR load depends on it. Every
    way GitHub can refuse — invalid token, exhausted quota, secondary rate limit, an
    organisation that needs SSO authorization, a missing scope, a repository the token
    cannot see — gets its own message and its own remedy. The token is sent only to
    api.github.com, lives in sessionStorage by default, and Remember on this browser is opt-in.

Read a PR as a story, not an alphabetical file dump

  • Behaviour units are derived from a PR's commits, named by an AI pass that cannot
    re-partition them, and grouped in the sidebar with behaviour-level comments.
  • Review order modes, a soft archive for finished reviews, a PR lifecycle badge, and a
    link straight back to the submitted review.
  • Diff ergonomics: syntax highlighting, line wrapping, full-file view, and a text
    selection that feeds the Ask box.

Overview diagrams that describe your PR

The whole-PR Overview asks for before/after and lifecycle diagrams. Its prompt shipped
two fully-worked examples from an unrelated system — 44% of the prompt on a small PR —
and models reproduced them verbatim at every size tested, 1.5B through 7B. The examples
are now slot templates and no slot may survive into the answer. Measured on
gwicho38/mcli#163: exemplar copying went from 17 hits to zero.

Local-only, by necessity

The claude engine and everything under Repowise need processes a web page cannot
start, so the hosted build does not offer them. Set the AI engine to in-browser there.

Upgrading

Nothing to do. pipx upgrade prview (or make install) for the local app; the hosted
build is a URL.

Assets 3
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