diff --git a/scripts/check-no-runtime-action-load-config.mjs b/scripts/check-no-runtime-action-load-config.mjs
index 57a15a69a6e7..a3492dbe6bfd 100644
--- a/scripts/check-no-runtime-action-load-config.mjs
+++ b/scripts/check-no-runtime-action-load-config.mjs
@@ -1,4 +1,5 @@
 #!/usr/bin/env node
+// Prevents runtime action paths from loading global config directly.
 import { collectRuntimeActionLoadConfigViolations } from "./lib/config-boundary-guard.mjs";
 
 function main() {
diff --git a/scripts/check-package-dist-imports.mjs b/scripts/check-package-dist-imports.mjs
index a2b4eeb03013..7a89d096a2ac 100644
--- a/scripts/check-package-dist-imports.mjs
+++ b/scripts/check-package-dist-imports.mjs
@@ -1,4 +1,5 @@
 #!/usr/bin/env node
+// Checks built package dist files for imports outside package boundaries.
 import fs from "node:fs";
 import path from "node:path";
 import { collectPackageDistImportErrors } from "./lib/package-dist-imports.mjs";
diff --git a/scripts/check-package-patches.mjs b/scripts/check-package-patches.mjs
index e091c28fe6a8..6eb72d49f544 100644
--- a/scripts/check-package-patches.mjs
+++ b/scripts/check-package-patches.mjs
@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+// Guards pnpm package patches against unapproved additions.
 import { execFileSync } from "node:child_process";
 import fs from "node:fs";
 import path from "node:path";
@@ -110,6 +111,9 @@ function collectPatchFileViolations(cwd, violations) {
   }
 }
 
+/**
+ * Collects disallowed package patch declarations and patch files.
+ */
 export function collectPackagePatchViolations(cwd = process.cwd()) {
   const violations = [];
   collectWorkspacePatchViolations(cwd, violations);
@@ -119,6 +123,9 @@ export function collectPackagePatchViolations(cwd = process.cwd()) {
   return violations;
 }
 
+/**
+ * Runs the package patch guard.
+ */
 export async function main() {
   const violations = collectPackagePatchViolations();
   if (violations.length === 0) {
diff --git a/scripts/check-pairing-account-scope.mjs b/scripts/check-pairing-account-scope.mjs
index 83a10750625b..e3370931be09 100644
--- a/scripts/check-pairing-account-scope.mjs
+++ b/scripts/check-pairing-account-scope.mjs
@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+// Checks pairing config logic for account-scoped allowlist handling.
 import ts from "typescript";
 import { createPairingGuardContext } from "./lib/pairing-guard-context.mjs";
 import {
diff --git a/scripts/check-plugin-extension-import-boundary.mjs b/scripts/check-plugin-extension-import-boundary.mjs
index 3d2844ec0791..a80912412fd2 100644
--- a/scripts/check-plugin-extension-import-boundary.mjs
+++ b/scripts/check-plugin-extension-import-boundary.mjs
@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+// Inventories core plugin imports that cross into bundled extension files.
 import { promises as fs } from "node:fs";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
@@ -158,6 +159,9 @@ function shouldSkipFile(filePath) {
   );
 }
 
+/**
+ * Cached inventory of src/plugins imports that cross into bundled extensions.
+ */
 export const collectPluginExtensionImportBoundaryInventory = createCachedAsync(async () => {
   const files = (await collectTypeScriptFilesFromRoots(scanRoots))
     .filter((filePath) => !shouldSkipFile(filePath))
@@ -177,10 +181,16 @@ export const collectPluginExtensionImportBoundaryInventory = createCachedAsync(a
   });
 });
 
+/**
+ * Cached expected plugin-extension import inventory baseline.
+ */
 export const readExpectedInventory = createCachedAsync(async () =>
   JSON.parse(await fs.readFile(baselinePath, "utf8")),
 );
 
+/**
+ * Diffs expected and actual plugin-extension boundary inventory entries.
+ */
 export function diffInventory(expected, actual) {
   return diffInventoryEntries(expected, actual, compareEntries);
 }
@@ -199,6 +209,9 @@ function formatEntry(entry) {
   return `${entry.file}:${entry.line} [${entry.kind}] ${entry.reason} (${entry.specifier} -> ${entry.resolvedPath})`;
 }
 
+/**
+ * Runs the plugin-extension import boundary baseline check.
+ */
 export async function runPluginExtensionImportBoundaryCheck(argv, io) {
   return await runBaselineInventoryCheck({
     argv: argv ?? process.argv.slice(2),
@@ -211,6 +224,9 @@ export async function runPluginExtensionImportBoundaryCheck(argv, io) {
   });
 }
 
+/**
+ * Entrypoint wrapper for the plugin-extension import boundary check.
+ */
 export async function main(argv, io) {
   const exitCode = await runPluginExtensionImportBoundaryCheck(argv, io);
   if (!io && exitCode !== 0) {
diff --git a/scripts/check-plugin-gateway-gauntlet.mjs b/scripts/check-plugin-gateway-gauntlet.mjs
index 687cdb418ec8..dfcf631c80f6 100644
--- a/scripts/check-plugin-gateway-gauntlet.mjs
+++ b/scripts/check-plugin-gateway-gauntlet.mjs
@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+// Runs plugin lifecycle and gateway QA gauntlet probes with timing metrics.
 import { spawn } from "node:child_process";
 import fs from "node:fs";
 import os from "node:os";
@@ -34,6 +35,9 @@ const DEFAULT_QA_PLUGIN_CHUNK_SIZE = 12;
 const COMMAND_OUTPUT_MAX_BUFFER_BYTES = 16 * 1024 * 1024;
 const ANSI_PATTERN = new RegExp(String.raw`\u001B\[[0-9;]*m`, "gu");
 
+/**
+ * Parses plugin gateway gauntlet CLI arguments and env defaults.
+ */
 export function parseArgs(argv) {
   const args = stripLeadingPackageManagerSeparator(argv);
   const options = {
@@ -226,6 +230,9 @@ function readOptionalNonNegativeIntEnv(name) {
   return raw ? parseNonNegativeInt(raw, name) : undefined;
 }
 
+/**
+ * Builds the command that prepares QA runtime artifacts before gauntlet probes.
+ */
 export function createGauntletPrebuildCommand(repoRoot) {
   return {
     command: process.execPath,
@@ -255,6 +262,9 @@ function chunkArray(values, chunkSize) {
   return chunks;
 }
 
+/**
+ * Converts an output path to a repo-relative path, rejecting paths outside the repo.
+ */
 export function toRepoRelativePath(repoRoot, absolutePath) {
   const relativePath = path.relative(repoRoot, absolutePath);
   if (!relativePath || relativePath.startsWith("..") || path.isAbsolute(relativePath)) {
@@ -303,6 +313,9 @@ function timeWrapperArgs(command, args) {
   return { command: "/usr/bin/time", args: ["-v", command, ...args], mode: "gnu" };
 }
 
+/**
+ * Parses `/usr/bin/time` output into wall, CPU, and RSS metrics.
+ */
 export function parseTimedMetrics(stderr, wallMs, mode) {
   let userSeconds = null;
   let systemSeconds = null;
@@ -374,10 +387,16 @@ function writeCommandLog(params) {
   return logPath;
 }
 
+/**
+ * Runs a measured command through the live process implementation.
+ */
 export async function runMeasuredCommand(params) {
   return await runMeasuredCommandLive(params);
 }
 
+/**
+ * Runs one command with optional timing wrapper, bounded output, and log capture.
+ */
 export function runMeasuredCommandLive(params) {
   const { command, args, mode } =
     params.timeMode === "none"
@@ -600,6 +619,9 @@ export function runMeasuredCommandLive(params) {
   });
 }
 
+/**
+ * Reports whether gauntlet result rows contain work beyond the prebuild step.
+ */
 export function hasGauntletWorkRows(rows) {
   return rows.some((row) => row.phase !== "prebuild");
 }
diff --git a/scripts/check-plugin-npm-runtime-builds.mjs b/scripts/check-plugin-npm-runtime-builds.mjs
index b5a6c2d62de0..c9c48db4a2f2 100644
--- a/scripts/check-plugin-npm-runtime-builds.mjs
+++ b/scripts/check-plugin-npm-runtime-builds.mjs
@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+// Verifies publishable plugin packages can build their npm runtime outputs.
 import fs from "node:fs";
 import path from "node:path";
 import { pathToFileURL } from "node:url";
@@ -30,6 +31,9 @@ function parseArgs(argv) {
   return { packageDirs };
 }
 
+/**
+ * Builds publishable plugin npm runtimes and verifies declared outputs exist.
+ */
 export async function checkPluginNpmRuntimeBuilds(params = {}) {
   const repoRoot = path.resolve(params.repoRoot ?? ".");
   const packageDirs =
diff --git a/scripts/check-plugin-sdk-subpath-exports.mjs b/scripts/check-plugin-sdk-subpath-exports.mjs
index a03a3a2d4714..fe359c3e2e5e 100644
--- a/scripts/check-plugin-sdk-subpath-exports.mjs
+++ b/scripts/check-plugin-sdk-subpath-exports.mjs
@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+// Verifies plugin SDK subpath exports and generated entrypoint metadata.
 import { readFileSync } from "node:fs";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
diff --git a/scripts/check-plugin-sdk-wildcard-reexports.mjs b/scripts/check-plugin-sdk-wildcard-reexports.mjs
index fa48fadaf79d..e37dcb9c6897 100644
--- a/scripts/check-plugin-sdk-wildcard-reexports.mjs
+++ b/scripts/check-plugin-sdk-wildcard-reexports.mjs
@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+// Rejects wildcard plugin SDK re-exports in extension API barrels.
 import fs from "node:fs/promises";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
@@ -34,6 +35,9 @@ async function listExtensionApiFiles(rootDir = extensionsRoot) {
   return files.toSorted((left, right) => left.localeCompare(right));
 }
 
+/**
+ * Finds wildcard plugin SDK re-export lines in an extension API barrel.
+ */
 export function findPluginSdkWildcardReexports(source) {
   return source
     .split(/\r?\n/u)
@@ -41,6 +45,9 @@ export function findPluginSdkWildcardReexports(source) {
     .filter(({ text }) => WILDCARD_PLUGIN_SDK_REEXPORT_PATTERN.test(text));
 }
 
+/**
+ * Collects extension API barrels that wildcard re-export plugin SDK subpaths.
+ */
 export async function collectPluginSdkWildcardReexports(rootDir = repoRoot) {
   const files = await listExtensionApiFiles(path.join(rootDir, "extensions"));
   const violations = [];
@@ -57,6 +64,9 @@ export async function collectPluginSdkWildcardReexports(rootDir = repoRoot) {
   return violations;
 }
 
+/**
+ * Runs the plugin SDK wildcard re-export guard.
+ */
 export async function main(argv = process.argv.slice(2), io = process) {
   const json = argv.includes("--json");
   const violations = await collectPluginSdkWildcardReexports();
diff --git a/scripts/check-release-metadata-only.mjs b/scripts/check-release-metadata-only.mjs
index 17dee2be607a..e1c18b29d4d7 100644
--- a/scripts/check-release-metadata-only.mjs
+++ b/scripts/check-release-metadata-only.mjs
@@ -1,4 +1,5 @@
 #!/usr/bin/env node
+// Validates release metadata-only changed scopes for CI routing.
 import { execFileSync } from "node:child_process";
 import { existsSync, readFileSync } from "node:fs";
 import { RELEASE_METADATA_PATHS } from "./changed-lanes.mjs";
diff --git a/scripts/check-runtime-sidecar-loaders.mjs b/scripts/check-runtime-sidecar-loaders.mjs
index 5e691ea236d3..20e0799893fb 100644
--- a/scripts/check-runtime-sidecar-loaders.mjs
+++ b/scripts/check-runtime-sidecar-loaders.mjs
@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+// Finds hidden local runtime sidecar loaders missing tsdown entries.
 import { promises as fs } from "node:fs";
 import path from "node:path";
 import ts from "typescript";
@@ -79,6 +80,9 @@ function readObjectEntrySources(entry) {
   return Object.values(entry).filter((value) => typeof value === "string");
 }
 
+/**
+ * Collects explicit source entry files from tsdown configuration.
+ */
 export function collectTsdownEntrySources(config) {
   const configs = Array.isArray(config) ? config : [config];
   return new Set(
@@ -86,6 +90,9 @@ export function collectTsdownEntrySources(config) {
   );
 }
 
+/**
+ * Finds local runtime require loaders not represented as explicit tsdown entries.
+ */
 export function findRuntimeSidecarLoaderViolations(content, importerPath, explicitEntrySources) {
   const sourceFile = ts.createSourceFile(importerPath, content, ts.ScriptTarget.Latest, true);
   const createRequireNames = new Set();
@@ -220,6 +227,9 @@ export function findRuntimeSidecarLoaderViolations(content, importerPath, explic
   return violations;
 }
 
+/**
+ * Collects runtime sidecar loader violations across configured roots.
+ */
 export async function collectRuntimeSidecarLoaderViolations(params) {
   const files = await collectTypeScriptFilesFromRoots(params.sourceRoots, {
     extraTestSuffixes: [".test-support.ts", ".test-helpers.ts"],
diff --git a/scripts/check-sdk-package-extension-import-boundary.mjs b/scripts/check-sdk-package-extension-import-boundary.mjs
index ff1e45decdcb..54dc54ca06c9 100644
--- a/scripts/check-sdk-package-extension-import-boundary.mjs
+++ b/scripts/check-sdk-package-extension-import-boundary.mjs
@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+// Runs the SDK-package extension import boundary checker.
 import { createExtensionImportBoundaryChecker } from "./lib/extension-import-boundary-checker.mjs";
 import { runAsScript } from "./lib/ts-guard-utils.mjs";
 
@@ -15,6 +16,9 @@ const checker = createExtensionImportBoundaryChecker({
   },
 });
 
+/**
+ * Entrypoint for the SDK-package extension import boundary checker.
+ */
 export const main = checker.main;
 
 runAsScript(import.meta.url, main);
diff --git a/scripts/check-src-extension-import-boundary.mjs b/scripts/check-src-extension-import-boundary.mjs
index ac23a389f243..347c3d9998e0 100644
--- a/scripts/check-src-extension-import-boundary.mjs
+++ b/scripts/check-src-extension-import-boundary.mjs
@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+// Runs the src/** extension import boundary checker.
 import { createExtensionImportBoundaryChecker } from "./lib/extension-import-boundary-checker.mjs";
 import { runAsScript } from "./lib/ts-guard-utils.mjs";
 
@@ -25,6 +26,9 @@ const checker = createExtensionImportBoundaryChecker({
   },
 });
 
+/**
+ * Entrypoint for the src extension import boundary checker.
+ */
 export const main = checker.main;
 
 runAsScript(import.meta.url, main);
diff --git a/scripts/check-telegram-grammy-types-imports.mjs b/scripts/check-telegram-grammy-types-imports.mjs
index ffea5f3a8686..f3cbd323eef5 100644
--- a/scripts/check-telegram-grammy-types-imports.mjs
+++ b/scripts/check-telegram-grammy-types-imports.mjs
@@ -1,4 +1,5 @@
 #!/usr/bin/env node
+// Prevents Telegram runtime imports from grammy type-only modules.
 import { readdirSync, readFileSync } from "node:fs";
 import path from "node:path";
 
diff --git a/scripts/check-test-helper-extension-import-boundary.mjs b/scripts/check-test-helper-extension-import-boundary.mjs
index cae1c034818c..7197dc48eb4e 100644
--- a/scripts/check-test-helper-extension-import-boundary.mjs
+++ b/scripts/check-test-helper-extension-import-boundary.mjs
@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+// Runs the test-helper extension import boundary checker.
 import { createExtensionImportBoundaryChecker } from "./lib/extension-import-boundary-checker.mjs";
 import { runAsScript } from "./lib/ts-guard-utils.mjs";
 
@@ -11,7 +12,13 @@ const checker = createExtensionImportBoundaryChecker({
   inventoryTitle: "Test-helper extension import boundary inventory:",
 });
 
+/**
+ * Collects test-helper extension import boundary inventory.
+ */
 export const collectTestHelperExtensionImportBoundaryInventory = checker.collectInventory;
+/**
+ * Entrypoint for the test-helper extension import boundary checker.
+ */
 export const main = checker.main;
 
 runAsScript(import.meta.url, main);
diff --git a/scripts/check-timed.mjs b/scripts/check-timed.mjs
index 103c98ac752f..3315d8a6bea8 100644
--- a/scripts/check-timed.mjs
+++ b/scripts/check-timed.mjs
@@ -1,3 +1,4 @@
+// Wraps the aggregate check command with timing behavior.
 import { main } from "./check.mjs";
 
 await main([...process.argv.slice(2), "--timed"]);
diff --git a/scripts/check-tsgo-core-boundary.mjs b/scripts/check-tsgo-core-boundary.mjs
index 9d4999af76e3..c7771827a54a 100644
--- a/scripts/check-tsgo-core-boundary.mjs
+++ b/scripts/check-tsgo-core-boundary.mjs
@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+// Enforces core tsgo project boundaries and sparse-checkout safety.
 import { spawnSync } from "node:child_process";
 import path from "node:path";
 import { createManagedCommandInvocation } from "./lib/managed-child-process.mjs";