diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
new file mode 100644
index 0000000..46c2d15
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,31 @@
+## What
+
+What changed?
+
+## Why
+
+What problem does this solve?
+
+## How
+
+How does it work? Note relevant design choices.
+
+## Reuse
+
+What existing package, module, library, or service did you consider or reuse? If none fit, why?
+
+## Validation
+
+- Acceptance criteria and their contract or edge-case tests:
+- The repository's documented lint, test, build, typecheck, and other required gates on this commit:
+- Generated artifacts regenerated with the official tools, if applicable:
+
+## Definition of Done
+
+- [ ] One package, or one isolated cross-cutting gate change, per PR.
+- [ ] Each acceptance criterion has a contract or edge-case test.
+- [ ] The repository's documented lint, test, build, typecheck, and other required gates pass on this commit.
+- [ ] Measure size when a bundle or export changes; add or update JSDoc when a public API changes.
+- [ ] Required changeset and documentation updates are included.
+- [ ] No tests were disabled to pass checks.
+- [ ] Generated artifacts were regenerated with the official tools, when applicable.