GitHub Action T‐shirt Size the PR

This GitHub Action automatically assigns a T-shirt size to every pull request — based on how big the change is.
This action is part of SSW’s recommended pull request workflow.

When It Runs

• On pull request opened

• On updates to a PR (synchronize)

• On PR reopened

What It Does

1. Checks out the PR code

   • Uses full history (fetch-depth: 0) so that diffs can be calculated accurately

2. Runs Microsoft’s PR-Metrics action

   • Calculates a score based on the number of lines changed

   • Classifies the PR into a “size category” (e.g. XS, S, M, L, XL, XXL)

   • Posts the result as a status check on the PR