Open-source GitHub Action that surfaces architectural decisions on PRs when protected files change. Github Action to enforce ADRs

[decispher]

I built an action that solves a problem we kept running into — developers modifying critical code without knowing why it was implemented a certain way.

How it works:

• You write decision records in markdown (what was decided, why, which files are affected)
• When a PR touches those files, the action automatically posts a comment with the relevant context
• Comments are idempotent (updates instead of spamming), supports glob patterns, regex content matching, and handles PRs with 3000+ files

What it's NOT:

• Not a linter or code quality tool
• No external network calls — runs entirely in your runner
• No data leaves GitHub

MIT licensed, fully open source
It's basically CODEOWNERS but for "why" instead of "who."

Repo: Decision guardian