diff --git a/package.json b/package.json
index 555f6e26..3acf52a1 100644
--- a/package.json
+++ b/package.json
@@ -205,10 +205,9 @@
     "lint:grammar": "cspell ./src",
     "postinstall": "npx grunt exec:fixCryptoApiImports && npx grunt exec:fixSnackbarMarkup",
     "newop": "node src/core/config/scripts/newOperation.mjs",
-    "minor": "node src/core/config/scripts/newMinorVersion.mjs && npm version minor --git-tag-version=false && echo \"Updated to version v$(npm pkg get version | xargs), please create a pull request and once merged use 'npm run tag'\"",
-    "tag": "git tag -s \"v$(npm pkg get version | xargs)\" -m \"$(npm pkg get version | xargs)\" && echo \"Created v$(npm pkg get version | xargs), now check and push the tag\"",
-    "getheapsize": "node -e 'console.log(`node heap limit = ${require(\"v8\").getHeapStatistics().heap_size_limit / (1024 * 1024)} Mb`)'",
-    "setheapsize": "export NODE_OPTIONS=--max_old_space_size=2048"
+    "minor": "node src/core/config/scripts/bumpMinor.mjs",
+    "tag": "node src/core/config/scripts/tagRelease.mjs",
+    "getheapsize": "node --no-warnings src/core/config/scripts/getHeapSize.mjs"
   },
   "engines": {
     "node": ">=24 <25"
diff --git a/plan-buildsystem-agnostic.md b/plan-buildsystem-agnostic.md
index b5ae7b1a..9e23dbb8 100644
--- a/plan-buildsystem-agnostic.md
+++ b/plan-buildsystem-agnostic.md
@@ -16,9 +16,9 @@ Stages are executed by Leon, not the agent. Tick each box once the stage is done
 - [x] 1g. Webpack output path uses `path.join` _(2026-05-19)_
 
 ### Section 2 — [package.json](package.json)
-- [ ] 2a. `setheapsize` deleted
-- [ ] 2b. `getheapsize` switched to `getHeapSize.mjs`
-- [ ] 2c. `minor` / `tag` switched to `.mjs` orchestrators
+- [x] 2a. `setheapsize` deleted _(2026-05-19)_
+- [x] 2b. `getheapsize` switched to `getHeapSize.mjs` _(2026-05-19)_
+- [x] 2c. `minor` / `tag` switched to `.mjs` orchestrators _(2026-05-19)_
 
 ### Verification
 - [ ] macOS: 7-step verification pass (see "Verification" section below)
diff --git a/src/core/config/scripts/bumpMinor.mjs b/src/core/config/scripts/bumpMinor.mjs
new file mode 100644
index 00000000..01e1dcad
--- /dev/null
+++ b/src/core/config/scripts/bumpMinor.mjs
@@ -0,0 +1,27 @@
+/**
+ * Orchestrates a minor version bump: regenerates the CHANGELOG via
+ * newMinorVersion.mjs, runs `npm version minor` (without a git tag),
+ * then prints a follow-up message that includes the new version.
+ *
+ * Replaces the previous shell-substitution npm script so it works on
+ * Windows cmd.exe as well as POSIX shells.
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+
+/* eslint no-console: ["off"] */
+
+import { execSync } from "child_process";
+import { readFileSync } from "fs";
+import { dirname, join } from "path";
+import { fileURLToPath } from "url";
+
+const pkgPath = join(dirname(fileURLToPath(import.meta.url)), "..", "..", "..", "..", "package.json");
+
+execSync("node src/core/config/scripts/newMinorVersion.mjs", { stdio: "inherit" });
+execSync("npm version minor --git-tag-version=false", { stdio: "inherit" });
+
+const version = JSON.parse(readFileSync(pkgPath, "utf8")).version;
+console.log(`Updated to version v${version}, please create a pull request and once merged use 'npm run tag'`);
diff --git a/src/core/config/scripts/getHeapSize.mjs b/src/core/config/scripts/getHeapSize.mjs
new file mode 100644
index 00000000..0cdde0b7
--- /dev/null
+++ b/src/core/config/scripts/getHeapSize.mjs
@@ -0,0 +1,13 @@
+/**
+ * Prints the Node V8 heap size limit in MB.
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+
+/* eslint no-console: ["off"] */
+
+import v8 from "v8";
+
+console.log(`node heap limit = ${v8.getHeapStatistics().heap_size_limit / (1024 * 1024)} Mb`);
diff --git a/src/core/config/scripts/tagRelease.mjs b/src/core/config/scripts/tagRelease.mjs
new file mode 100644
index 00000000..3be8624f
--- /dev/null
+++ b/src/core/config/scripts/tagRelease.mjs
@@ -0,0 +1,24 @@
+/**
+ * Creates a signed git tag matching the version in package.json,
+ * then prints a follow-up message.
+ *
+ * Replaces the previous shell-substitution npm script so it works on
+ * Windows cmd.exe as well as POSIX shells.
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+
+/* eslint no-console: ["off"] */
+
+import { execSync } from "child_process";
+import { readFileSync } from "fs";
+import { dirname, join } from "path";
+import { fileURLToPath } from "url";
+
+const pkgPath = join(dirname(fileURLToPath(import.meta.url)), "..", "..", "..", "..", "package.json");
+const version = JSON.parse(readFileSync(pkgPath, "utf8")).version;
+
+execSync(`git tag -s "v${version}" -m "${version}"`, { stdio: "inherit" });
+console.log(`Created v${version}, now check and push the tag`);