Ignore agent files as changesets (#120)

* Ignore agent files as changesets

ref: changesets/changesets#2066

* Fix lint and test

Author: bluwy

get-changed-packages.ts

@@ -13,6 +13,8 @@ import jsYaml from "js-yaml";
 import micromatch from "micromatch";
 import type { ProbotOctokit } from "probot";
 
+import { isChangeset } from "./is-changeset.ts";
+
 interface PackageJSON extends ChangesetPackageJSON {
   workspaces?: ReadonlyArray<string> | { packages: ReadonlyArray<string> };
   bolt?: { workspaces: ReadonlyArray<string> };
@@ -117,12 +119,7 @@ export const getChangedPackages = async ({
       isPnpm = true;
     } else if (item.path === ".changeset/pre.json") {
       preStatePromise = fetchJsonFile(".changeset/pre.json");
-    } else if (
-      item.path !== ".changeset/README.md" &&
-      item.path.startsWith(".changeset") &&
-      item.path.endsWith(".md") &&
-      changedFiles.includes(item.path)
-    ) {
+    } else if (changedFiles.includes(item.path) && isChangeset(item.path)) {
       const res = /\.changeset\/([^.]+)\.md/.exec(item.path);
       if (!res) {
         throw new Error("could not get name from changeset filename");

index.ts

@@ -6,6 +6,7 @@ import { humanId } from "human-id";
 import markdownTable from "markdown-table";
 import type { Probot, Context } from "probot";
 import { getChangedPackages } from "./get-changed-packages.ts";
+import { isChangeset } from "./is-changeset.ts";
 
 const getReleasePlanMessage = (releasePlan: ReleasePlan | null) => {
   if (!releasePlan) return "";
@@ -111,12 +112,7 @@ const hasChangesetBeenAdded = (
   changedFilesPromise: ReturnType<PRContext["octokit"]["pulls"]["listFiles"]>,
 ) =>
   changedFilesPromise.then((filesResponse) =>
-    filesResponse.data.some(
-      (file) =>
-        file.status === "added" &&
-        /^\.changeset\/.+\.md$/.test(file.filename) &&
-        file.filename !== ".changeset/README.md",
-    ),
+    filesResponse.data.some((file) => file.status === "added" && isChangeset(file.filename)),
   );
 
 export default (app: Probot) => {

is-changeset.ts

@@ -0,0 +1,18 @@
+// Files in `.changeset` that should not be considered as changesets.
+// Should match `@changesets/read`.
+const ignoredMdFiles = [/^README\.md$/i, "AGENTS.md", "CLAUDE.md", "GEMINI.md"];
+
+export function isChangeset(filename: string) {
+  if (!filename.startsWith(".changeset/")) return false;
+
+  const file = filename.slice(".changeset/".length);
+
+  // Perform same check as `@changesets/read`
+  return (
+    !file.startsWith(".") &&
+    file.endsWith(".md") &&
+    !ignoredMdFiles.some((pattern) =>
+      typeof pattern === "string" ? pattern === file : pattern.test(file),
+    )
+  );
+}