diff --git a/test/vitest/vitest.acp.config.ts b/test/vitest/vitest.acp.config.ts
index bfaac96c73ab..8de89e1654e0 100644
--- a/test/vitest/vitest.acp.config.ts
+++ b/test/vitest/vitest.acp.config.ts
@@ -1,3 +1,4 @@
+// Vitest acp config wires the acp test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createAcpVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.agents-core.config.ts b/test/vitest/vitest.agents-core.config.ts
index 2de203968dcc..464ab687914e 100644
--- a/test/vitest/vitest.agents-core.config.ts
+++ b/test/vitest/vitest.agents-core.config.ts
@@ -1,3 +1,4 @@
+// Vitest agents core config wires the agents core test shard.
 import { agentsCoreTestPatterns } from "./vitest.agents-paths.mjs";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
diff --git a/test/vitest/vitest.agents-embedded-agent.config.ts b/test/vitest/vitest.agents-embedded-agent.config.ts
index 60ce779aa167..b8b325a0924d 100644
--- a/test/vitest/vitest.agents-embedded-agent.config.ts
+++ b/test/vitest/vitest.agents-embedded-agent.config.ts
@@ -1,3 +1,4 @@
+// Vitest agents embedded agent config wires the agents embedded agent test shard.
 import { agentsEmbeddedTestPatterns } from "./vitest.agents-paths.mjs";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
diff --git a/test/vitest/vitest.agents-support.config.ts b/test/vitest/vitest.agents-support.config.ts
index 2e5fa363b798..2cd3b2f128ec 100644
--- a/test/vitest/vitest.agents-support.config.ts
+++ b/test/vitest/vitest.agents-support.config.ts
@@ -1,3 +1,4 @@
+// Vitest agents support config wires the agents support test shard.
 import { agentsSupportExcludePatterns, agentsSupportTestPatterns } from "./vitest.agents-paths.mjs";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
diff --git a/test/vitest/vitest.agents-tools.config.ts b/test/vitest/vitest.agents-tools.config.ts
index 19ffc2945d98..fad9737a8067 100644
--- a/test/vitest/vitest.agents-tools.config.ts
+++ b/test/vitest/vitest.agents-tools.config.ts
@@ -1,3 +1,4 @@
+// Vitest agents tools config wires the agents tools test shard.
 import { agentsToolsTestPatterns } from "./vitest.agents-paths.mjs";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
diff --git a/test/vitest/vitest.agents.config.ts b/test/vitest/vitest.agents.config.ts
index b3e974571ec1..b0a87542bfdb 100644
--- a/test/vitest/vitest.agents.config.ts
+++ b/test/vitest/vitest.agents.config.ts
@@ -1,3 +1,4 @@
+// Vitest agents config wires the agents test shard.
 import { agentsAllTestPatterns } from "./vitest.agents-paths.mjs";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
diff --git a/test/vitest/vitest.auto-reply-core.config.ts b/test/vitest/vitest.auto-reply-core.config.ts
index 00ad2697bee6..47801f526874 100644
--- a/test/vitest/vitest.auto-reply-core.config.ts
+++ b/test/vitest/vitest.auto-reply-core.config.ts
@@ -1,3 +1,4 @@
+// Vitest auto reply core config wires the auto reply core test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 import { autoReplyCoreTestExclude, autoReplyCoreTestInclude } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.auto-reply-reply.config.ts b/test/vitest/vitest.auto-reply-reply.config.ts
index eb3af666497e..8e0b0091084c 100644
--- a/test/vitest/vitest.auto-reply-reply.config.ts
+++ b/test/vitest/vitest.auto-reply-reply.config.ts
@@ -1,3 +1,4 @@
+// Vitest auto reply reply config wires the auto reply reply test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 import { autoReplyReplySubtreeTestInclude } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.auto-reply-top-level.config.ts b/test/vitest/vitest.auto-reply-top-level.config.ts
index 27d179acdaec..913483bf8931 100644
--- a/test/vitest/vitest.auto-reply-top-level.config.ts
+++ b/test/vitest/vitest.auto-reply-top-level.config.ts
@@ -1,3 +1,4 @@
+// Vitest auto reply top level config wires the auto reply top level test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 import { autoReplyTopLevelReplyTestInclude } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.auto-reply.config.ts b/test/vitest/vitest.auto-reply.config.ts
index 14fb2a1ec213..019641e50ccd 100644
--- a/test/vitest/vitest.auto-reply.config.ts
+++ b/test/vitest/vitest.auto-reply.config.ts
@@ -1,3 +1,4 @@
+// Vitest auto reply config wires the auto reply test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createAutoReplyVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.boundary.config.ts b/test/vitest/vitest.boundary.config.ts
index e534f45c2a4c..14064ebb0e57 100644
--- a/test/vitest/vitest.boundary.config.ts
+++ b/test/vitest/vitest.boundary.config.ts
@@ -1,3 +1,4 @@
+// Vitest boundary config wires the boundary test shard.
 import { defineProject } from "vitest/config";
 import { loadPatternListFromEnv, narrowIncludePatternsForCli } from "./vitest.pattern-file.ts";
 import { resolveVitestIsolation } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.bundled-plugin-paths.ts b/test/vitest/vitest.bundled-plugin-paths.ts
index aebf71ffeebd..db1682a5dfbf 100644
--- a/test/vitest/vitest.bundled-plugin-paths.ts
+++ b/test/vitest/vitest.bundled-plugin-paths.ts
@@ -1,3 +1,4 @@
+// Vitest bundled plugin paths helper lists test file patterns for the bundled plugin paths shard.
 export const BUNDLED_PLUGIN_ROOT_DIR = "extensions";
 export const BUNDLED_PLUGIN_PATH_PREFIX = `${BUNDLED_PLUGIN_ROOT_DIR}/`;
 export const BUNDLED_PLUGIN_TEST_GLOB = `${BUNDLED_PLUGIN_ROOT_DIR}/**/*.test.ts`;
diff --git a/test/vitest/vitest.bundled.config.ts b/test/vitest/vitest.bundled.config.ts
index cc6b91e363ab..0fc804b5ced8 100644
--- a/test/vitest/vitest.bundled.config.ts
+++ b/test/vitest/vitest.bundled.config.ts
@@ -1,3 +1,4 @@
+// Vitest bundled config wires the bundled test shard.
 import path from "node:path";
 import {
   bundledPluginDependentUnitTestFiles,
diff --git a/test/vitest/vitest.channels.config.ts b/test/vitest/vitest.channels.config.ts
index e0448ffb98c6..e088a994cb9a 100644
--- a/test/vitest/vitest.channels.config.ts
+++ b/test/vitest/vitest.channels.config.ts
@@ -1,3 +1,4 @@
+// Vitest channels config wires the channels test shard.
 import { coreChannelTestInclude } from "./vitest.channel-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.cli.config.ts b/test/vitest/vitest.cli.config.ts
index 953baa1e06a9..8f3516f7b717 100644
--- a/test/vitest/vitest.cli.config.ts
+++ b/test/vitest/vitest.cli.config.ts
@@ -1,3 +1,4 @@
+// Vitest cli config wires the cli test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createCliVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.commands-light.config.ts b/test/vitest/vitest.commands-light.config.ts
index fbe6b51e07c1..19c6323f5c24 100644
--- a/test/vitest/vitest.commands-light.config.ts
+++ b/test/vitest/vitest.commands-light.config.ts
@@ -1,3 +1,4 @@
+// Vitest commands light config wires the commands light test shard.
 import { commandsLightTestFiles } from "./vitest.commands-light-paths.mjs";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 import { getUnitFastTestFiles } from "./vitest.unit-fast-paths.mjs";
diff --git a/test/vitest/vitest.commands.config.ts b/test/vitest/vitest.commands.config.ts
index b3188ed1b9f2..b780fbbffd4f 100644
--- a/test/vitest/vitest.commands.config.ts
+++ b/test/vitest/vitest.commands.config.ts
@@ -1,3 +1,4 @@
+// Vitest commands config wires the commands test shard.
 import { commandsLightTestFiles } from "./vitest.commands-light-paths.mjs";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
diff --git a/test/vitest/vitest.config.ts b/test/vitest/vitest.config.ts
index 823aeff3f37d..37c8c916ed1b 100644
--- a/test/vitest/vitest.config.ts
+++ b/test/vitest/vitest.config.ts
@@ -1,3 +1,4 @@
+// Vitest config config wires the config test shard.
 import { defineConfig } from "vitest/config";
 import {
   resolveDefaultVitestPool,
diff --git a/test/vitest/vitest.contracts-channel-config.config.ts b/test/vitest/vitest.contracts-channel-config.config.ts
index e10776bb42f2..a53a06bc0fd9 100644
--- a/test/vitest/vitest.contracts-channel-config.config.ts
+++ b/test/vitest/vitest.contracts-channel-config.config.ts
@@ -1,3 +1,4 @@
+// Vitest contracts channel config config wires the contracts channel config test shard.
 import {
   channelConfigContractPatterns,
   createContractsVitestConfig,
diff --git a/test/vitest/vitest.contracts-channel-registry.config.ts b/test/vitest/vitest.contracts-channel-registry.config.ts
index 9e479b632d7a..9cc0870ad67a 100644
--- a/test/vitest/vitest.contracts-channel-registry.config.ts
+++ b/test/vitest/vitest.contracts-channel-registry.config.ts
@@ -1,3 +1,4 @@
+// Vitest contracts channel registry config wires the contracts channel registry test shard.
 import {
   channelRegistryContractPatterns,
   createContractsVitestConfig,
diff --git a/test/vitest/vitest.contracts-channel-session.config.ts b/test/vitest/vitest.contracts-channel-session.config.ts
index b20826aa9761..dace5c1624ff 100644
--- a/test/vitest/vitest.contracts-channel-session.config.ts
+++ b/test/vitest/vitest.contracts-channel-session.config.ts
@@ -1,3 +1,4 @@
+// Vitest contracts channel session config wires the contracts channel session test shard.
 import {
   channelSessionContractPatterns,
   createContractsVitestConfig,
diff --git a/test/vitest/vitest.contracts-channel-surface.config.ts b/test/vitest/vitest.contracts-channel-surface.config.ts
index 3c455ffa1a62..f0b313207eee 100644
--- a/test/vitest/vitest.contracts-channel-surface.config.ts
+++ b/test/vitest/vitest.contracts-channel-surface.config.ts
@@ -1,3 +1,4 @@
+// Vitest contracts channel surface config wires the contracts channel surface test shard.
 import {
   channelSurfaceContractPatterns,
   createContractsVitestConfig,
diff --git a/test/vitest/vitest.contracts-plugin.config.ts b/test/vitest/vitest.contracts-plugin.config.ts
index 2ffd080015d4..463995ec6f55 100644
--- a/test/vitest/vitest.contracts-plugin.config.ts
+++ b/test/vitest/vitest.contracts-plugin.config.ts
@@ -1,3 +1,4 @@
+// Vitest contracts plugin config wires the contracts plugin test shard.
 import { createContractsVitestConfig, pluginContractPatterns } from "./vitest.contracts-shared.ts";
 
 export default createContractsVitestConfig(pluginContractPatterns, process.env, process.argv, {
diff --git a/test/vitest/vitest.contracts-shared.ts b/test/vitest/vitest.contracts-shared.ts
index dc8e47bba223..13aa9e8823bd 100644
--- a/test/vitest/vitest.contracts-shared.ts
+++ b/test/vitest/vitest.contracts-shared.ts
@@ -1,3 +1,4 @@
+// Vitest contract shared helpers build contract test project configuration.
 import path from "node:path";
 import { defineConfig } from "vitest/config";
 import { loadPatternListFromEnv, narrowIncludePatternsForCli } from "./vitest.pattern-file.ts";
diff --git a/test/vitest/vitest.cron.config.ts b/test/vitest/vitest.cron.config.ts
index eab0e44f557a..6b93aa1ad792 100644
--- a/test/vitest/vitest.cron.config.ts
+++ b/test/vitest/vitest.cron.config.ts
@@ -1,3 +1,4 @@
+// Vitest cron config wires the cron test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createCronVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.daemon.config.ts b/test/vitest/vitest.daemon.config.ts
index 393a1b59db48..068f768da658 100644
--- a/test/vitest/vitest.daemon.config.ts
+++ b/test/vitest/vitest.daemon.config.ts
@@ -1,3 +1,4 @@
+// Vitest daemon config wires the daemon test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createDaemonVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.e2e.config.ts b/test/vitest/vitest.e2e.config.ts
index b1d5589e5d85..72ed7bb46d7f 100644
--- a/test/vitest/vitest.e2e.config.ts
+++ b/test/vitest/vitest.e2e.config.ts
@@ -1,3 +1,4 @@
+// Vitest e2e config wires the e2e test shard.
 import os from "node:os";
 import { defineConfig } from "vitest/config";
 import { BUNDLED_PLUGIN_E2E_TEST_GLOB } from "./vitest.bundled-plugin-paths.ts";
diff --git a/test/vitest/vitest.extension-acpx.config.ts b/test/vitest/vitest.extension-acpx.config.ts
index 9530acf844b9..d8cd62f65e1c 100644
--- a/test/vitest/vitest.extension-acpx.config.ts
+++ b/test/vitest/vitest.extension-acpx.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension acpx config wires the extension acpx test shard.
 import { acpxExtensionTestRoots } from "./vitest.extension-acpx-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-active-memory.config.ts b/test/vitest/vitest.extension-active-memory.config.ts
index 85035b669033..0b3d2228f7a4 100644
--- a/test/vitest/vitest.extension-active-memory.config.ts
+++ b/test/vitest/vitest.extension-active-memory.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension active memory config wires the extension active memory test shard.
 import { activeMemoryExtensionTestRoots } from "./vitest.extension-active-memory-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-browser.config.ts b/test/vitest/vitest.extension-browser.config.ts
index 4cc8a8f3f7d9..f26c34d39e32 100644
--- a/test/vitest/vitest.extension-browser.config.ts
+++ b/test/vitest/vitest.extension-browser.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension browser config wires the extension browser test shard.
 import { browserExtensionTestRoots } from "./vitest.extension-browser-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-channel-single-config.ts b/test/vitest/vitest.extension-channel-single-config.ts
index 29ce376be48d..84b063b42338 100644
--- a/test/vitest/vitest.extension-channel-single-config.ts
+++ b/test/vitest/vitest.extension-channel-single-config.ts
@@ -1,3 +1,4 @@
+// Vitest extension channel single config helper supports extension channel single config test configuration.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createSingleChannelExtensionVitestConfig(
diff --git a/test/vitest/vitest.extension-channels.config.ts b/test/vitest/vitest.extension-channels.config.ts
index 28e627819273..02cb73707dec 100644
--- a/test/vitest/vitest.extension-channels.config.ts
+++ b/test/vitest/vitest.extension-channels.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension channels config wires the extension channels test shard.
 import {
   extensionChannelOverrideExcludeGlobs,
   extensionChannelTestInclude,
diff --git a/test/vitest/vitest.extension-clickclack.config.ts b/test/vitest/vitest.extension-clickclack.config.ts
index 0c636241bc7c..e0e8b590694f 100644
--- a/test/vitest/vitest.extension-clickclack.config.ts
+++ b/test/vitest/vitest.extension-clickclack.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension clickclack config wires the extension clickclack test shard.
 import { createSingleChannelExtensionVitestConfig } from "./vitest.extension-channel-single-config.ts";
 
 export function createExtensionClickClackVitestConfig(
diff --git a/test/vitest/vitest.extension-codex-app-server-attempt-extra.config.ts b/test/vitest/vitest.extension-codex-app-server-attempt-extra.config.ts
index 70467837fc11..54f6fdfb3a04 100644
--- a/test/vitest/vitest.extension-codex-app-server-attempt-extra.config.ts
+++ b/test/vitest/vitest.extension-codex-app-server-attempt-extra.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension codex app server attempt extra config wires the extension codex app server attempt extra test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createExtensionCodexAppServerAttemptExtraVitestConfig(
diff --git a/test/vitest/vitest.extension-codex-app-server-attempt-light.config.ts b/test/vitest/vitest.extension-codex-app-server-attempt-light.config.ts
index bbe4fc8f433a..c1c836de9b5f 100644
--- a/test/vitest/vitest.extension-codex-app-server-attempt-light.config.ts
+++ b/test/vitest/vitest.extension-codex-app-server-attempt-light.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension codex app server attempt light config wires the extension codex app server attempt light test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createExtensionCodexAppServerAttemptLightVitestConfig(
diff --git a/test/vitest/vitest.extension-codex-app-server-attempt-support.config.ts b/test/vitest/vitest.extension-codex-app-server-attempt-support.config.ts
index a560fde486b3..e9266ef2a948 100644
--- a/test/vitest/vitest.extension-codex-app-server-attempt-support.config.ts
+++ b/test/vitest/vitest.extension-codex-app-server-attempt-support.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension codex app server attempt support config wires the extension codex app server attempt support test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createExtensionCodexAppServerAttemptSupportVitestConfig(
diff --git a/test/vitest/vitest.extension-codex-app-server-attempt.config.ts b/test/vitest/vitest.extension-codex-app-server-attempt.config.ts
index b56f12f68e07..7c981dc5249d 100644
--- a/test/vitest/vitest.extension-codex-app-server-attempt.config.ts
+++ b/test/vitest/vitest.extension-codex-app-server-attempt.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension codex app server attempt config wires the extension codex app server attempt test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createExtensionCodexAppServerAttemptVitestConfig(
diff --git a/test/vitest/vitest.extension-codex-app-server-runtime.config.ts b/test/vitest/vitest.extension-codex-app-server-runtime.config.ts
index 49520d432491..ee712fa105d2 100644
--- a/test/vitest/vitest.extension-codex-app-server-runtime.config.ts
+++ b/test/vitest/vitest.extension-codex-app-server-runtime.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension codex app server runtime config wires the extension codex app server runtime test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createExtensionCodexAppServerRuntimeVitestConfig(
diff --git a/test/vitest/vitest.extension-codex-app-server-support.config.ts b/test/vitest/vitest.extension-codex-app-server-support.config.ts
index c0fb089dcaa2..3c29954641f7 100644
--- a/test/vitest/vitest.extension-codex-app-server-support.config.ts
+++ b/test/vitest/vitest.extension-codex-app-server-support.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension codex app server support config wires the extension codex app server support test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 const coveredAppServerPatterns = [
diff --git a/test/vitest/vitest.extension-codex-app-server-tools.config.ts b/test/vitest/vitest.extension-codex-app-server-tools.config.ts
index 1aada7949491..b6f1f706beef 100644
--- a/test/vitest/vitest.extension-codex-app-server-tools.config.ts
+++ b/test/vitest/vitest.extension-codex-app-server-tools.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension codex app server tools config wires the extension codex app server tools test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createExtensionCodexAppServerToolsVitestConfig(
diff --git a/test/vitest/vitest.extension-codex-surface.config.ts b/test/vitest/vitest.extension-codex-surface.config.ts
index 020b641e4d22..5084b0f177c9 100644
--- a/test/vitest/vitest.extension-codex-surface.config.ts
+++ b/test/vitest/vitest.extension-codex-surface.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension codex surface config wires the extension codex surface test shard.
 import { codexExtensionTestRoots } from "./vitest.extension-codex-paths.mjs";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
diff --git a/test/vitest/vitest.extension-codex.config.ts b/test/vitest/vitest.extension-codex.config.ts
index 8539a617b10c..2ff707b3abd5 100644
--- a/test/vitest/vitest.extension-codex.config.ts
+++ b/test/vitest/vitest.extension-codex.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension codex config wires the extension codex test shard.
 import { codexExtensionTestRoots } from "./vitest.extension-codex-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-diffs.config.ts b/test/vitest/vitest.extension-diffs.config.ts
index 19fbea7ae1f0..d53162230b8b 100644
--- a/test/vitest/vitest.extension-diffs.config.ts
+++ b/test/vitest/vitest.extension-diffs.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension diffs config wires the extension diffs test shard.
 import { diffsExtensionTestRoots } from "./vitest.extension-diffs-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-discord.config.ts b/test/vitest/vitest.extension-discord.config.ts
index 645d5bc3bc67..d48d5e222833 100644
--- a/test/vitest/vitest.extension-discord.config.ts
+++ b/test/vitest/vitest.extension-discord.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension discord config wires the extension discord test shard.
 import { createSingleChannelExtensionVitestConfig } from "./vitest.extension-channel-single-config.ts";
 
 export function createExtensionDiscordVitestConfig(
diff --git a/test/vitest/vitest.extension-feishu.config.ts b/test/vitest/vitest.extension-feishu.config.ts
index eefe154a247d..baed30f4619e 100644
--- a/test/vitest/vitest.extension-feishu.config.ts
+++ b/test/vitest/vitest.extension-feishu.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension feishu config wires the extension feishu test shard.
 import { feishuExtensionTestRoots } from "./vitest.extension-feishu-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-imessage.config.ts b/test/vitest/vitest.extension-imessage.config.ts
index f5caccfd9f0a..77c3a74889de 100644
--- a/test/vitest/vitest.extension-imessage.config.ts
+++ b/test/vitest/vitest.extension-imessage.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension imessage config wires the extension imessage test shard.
 import { createSingleChannelExtensionVitestConfig } from "./vitest.extension-channel-single-config.ts";
 
 export function createExtensionImessageVitestConfig(
diff --git a/test/vitest/vitest.extension-irc.config.ts b/test/vitest/vitest.extension-irc.config.ts
index fca7e50ee69d..e588a3e9e440 100644
--- a/test/vitest/vitest.extension-irc.config.ts
+++ b/test/vitest/vitest.extension-irc.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension irc config wires the extension irc test shard.
 import { ircExtensionTestRoots } from "./vitest.extension-irc-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-line.config.ts b/test/vitest/vitest.extension-line.config.ts
index b09bf41c11ea..8b74141da8cb 100644
--- a/test/vitest/vitest.extension-line.config.ts
+++ b/test/vitest/vitest.extension-line.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension line config wires the extension line test shard.
 import { createSingleChannelExtensionVitestConfig } from "./vitest.extension-channel-single-config.ts";
 
 export function createExtensionLineVitestConfig(
diff --git a/test/vitest/vitest.extension-matrix.config.ts b/test/vitest/vitest.extension-matrix.config.ts
index 18bd8c297869..f1d9d5f514c1 100644
--- a/test/vitest/vitest.extension-matrix.config.ts
+++ b/test/vitest/vitest.extension-matrix.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension matrix config wires the extension matrix test shard.
 import { matrixExtensionTestRoots } from "./vitest.extension-matrix-paths.mjs";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
diff --git a/test/vitest/vitest.extension-mattermost.config.ts b/test/vitest/vitest.extension-mattermost.config.ts
index 7e1e0d95a4a7..c9907fe2df1b 100644
--- a/test/vitest/vitest.extension-mattermost.config.ts
+++ b/test/vitest/vitest.extension-mattermost.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension mattermost config wires the extension mattermost test shard.
 import { mattermostExtensionTestRoots } from "./vitest.extension-mattermost-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-media.config.ts b/test/vitest/vitest.extension-media.config.ts
index 4e7826e16bc7..d537a9add5f6 100644
--- a/test/vitest/vitest.extension-media.config.ts
+++ b/test/vitest/vitest.extension-media.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension media config wires the extension media test shard.
 import { mediaExtensionTestRoots } from "./vitest.extension-media-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-memory.config.ts b/test/vitest/vitest.extension-memory.config.ts
index 8fed363dab9c..a35d24d73988 100644
--- a/test/vitest/vitest.extension-memory.config.ts
+++ b/test/vitest/vitest.extension-memory.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension memory config wires the extension memory test shard.
 import { memoryExtensionTestRoots } from "./vitest.extension-memory-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-messaging.config.ts b/test/vitest/vitest.extension-messaging.config.ts
index bd2f2e00e752..a130ad8ee036 100644
--- a/test/vitest/vitest.extension-messaging.config.ts
+++ b/test/vitest/vitest.extension-messaging.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension messaging config wires the extension messaging test shard.
 import { messagingExtensionTestRoots } from "./vitest.extension-messaging-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-misc.config.ts b/test/vitest/vitest.extension-misc.config.ts
index 2db79b89e489..c114ec3edf0b 100644
--- a/test/vitest/vitest.extension-misc.config.ts
+++ b/test/vitest/vitest.extension-misc.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension misc config wires the extension misc test shard.
 import { miscExtensionTestRoots } from "./vitest.extension-misc-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-msteams.config.ts b/test/vitest/vitest.extension-msteams.config.ts
index c28e92c10801..f10d94a468df 100644
--- a/test/vitest/vitest.extension-msteams.config.ts
+++ b/test/vitest/vitest.extension-msteams.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension msteams config wires the extension msteams test shard.
 import { msTeamsExtensionTestRoots } from "./vitest.extension-msteams-paths.mjs";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
diff --git a/test/vitest/vitest.extension-provider-openai.config.ts b/test/vitest/vitest.extension-provider-openai.config.ts
index cb103c3a3052..eb5da2ca95bb 100644
--- a/test/vitest/vitest.extension-provider-openai.config.ts
+++ b/test/vitest/vitest.extension-provider-openai.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension provider openai config wires the extension provider openai test shard.
 import path from "node:path";
 import { providerOpenAiExtensionTestRoots } from "./vitest.extension-provider-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
diff --git a/test/vitest/vitest.extension-providers.config.ts b/test/vitest/vitest.extension-providers.config.ts
index 9fbc60487ac7..8db72db03a8d 100644
--- a/test/vitest/vitest.extension-providers.config.ts
+++ b/test/vitest/vitest.extension-providers.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension providers config wires the extension providers test shard.
 import { providerExtensionTestRoots } from "./vitest.extension-provider-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-qa.config.ts b/test/vitest/vitest.extension-qa.config.ts
index e6441026a5c9..f36c9787cf62 100644
--- a/test/vitest/vitest.extension-qa.config.ts
+++ b/test/vitest/vitest.extension-qa.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension qa config wires the extension qa test shard.
 import { qaExtensionTestRoots } from "./vitest.extension-qa-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-signal.config.ts b/test/vitest/vitest.extension-signal.config.ts
index 68231494e116..8e35b3d362d2 100644
--- a/test/vitest/vitest.extension-signal.config.ts
+++ b/test/vitest/vitest.extension-signal.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension signal config wires the extension signal test shard.
 import { createSingleChannelExtensionVitestConfig } from "./vitest.extension-channel-single-config.ts";
 
 export function createExtensionSignalVitestConfig(
diff --git a/test/vitest/vitest.extension-slack.config.ts b/test/vitest/vitest.extension-slack.config.ts
index 407ec6f5c397..8a078cb8a206 100644
--- a/test/vitest/vitest.extension-slack.config.ts
+++ b/test/vitest/vitest.extension-slack.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension slack config wires the extension slack test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createExtensionSlackVitestConfig(
diff --git a/test/vitest/vitest.extension-telegram.config.ts b/test/vitest/vitest.extension-telegram.config.ts
index 20c36ca04a68..5ccee8fbbd2f 100644
--- a/test/vitest/vitest.extension-telegram.config.ts
+++ b/test/vitest/vitest.extension-telegram.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension telegram config wires the extension telegram test shard.
 import { telegramExtensionTestRoots } from "./vitest.extension-telegram-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-voice-call.config.ts b/test/vitest/vitest.extension-voice-call.config.ts
index cfc6a1685cda..7ff1d1567985 100644
--- a/test/vitest/vitest.extension-voice-call.config.ts
+++ b/test/vitest/vitest.extension-voice-call.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension voice call config wires the extension voice call test shard.
 import { voiceCallExtensionTestRoots } from "./vitest.extension-voice-call-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-whatsapp.config.ts b/test/vitest/vitest.extension-whatsapp.config.ts
index 85a1bb468f58..76efff768c4a 100644
--- a/test/vitest/vitest.extension-whatsapp.config.ts
+++ b/test/vitest/vitest.extension-whatsapp.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension whatsapp config wires the extension whatsapp test shard.
 import { whatsAppExtensionTestRoots } from "./vitest.extension-whatsapp-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extension-zalo.config.ts b/test/vitest/vitest.extension-zalo.config.ts
index 9745aff07fee..cf9bff9e5544 100644
--- a/test/vitest/vitest.extension-zalo.config.ts
+++ b/test/vitest/vitest.extension-zalo.config.ts
@@ -1,3 +1,4 @@
+// Vitest extension zalo config wires the extension zalo test shard.
 import { zaloExtensionTestRoots } from "./vitest.extension-zalo-paths.mjs";
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
diff --git a/test/vitest/vitest.extensions.config.ts b/test/vitest/vitest.extensions.config.ts
index bce26d759d29..dc925c35111e 100644
--- a/test/vitest/vitest.extensions.config.ts
+++ b/test/vitest/vitest.extensions.config.ts
@@ -1,3 +1,4 @@
+// Vitest extensions config wires the extensions test shard.
 import { BUNDLED_PLUGIN_TEST_GLOB } from "./vitest.bundled-plugin-paths.ts";
 import { extensionExcludedChannelTestGlobs } from "./vitest.channel-paths.mjs";
 import { acpxExtensionTestRoots } from "./vitest.extension-acpx-paths.mjs";
diff --git a/test/vitest/vitest.full-agentic.config.ts b/test/vitest/vitest.full-agentic.config.ts
index b00eb99cd76a..ae3bb10356cf 100644
--- a/test/vitest/vitest.full-agentic.config.ts
+++ b/test/vitest/vitest.full-agentic.config.ts
@@ -1,3 +1,4 @@
+// Vitest full agentic config wires the full agentic test shard.
 import { createProjectShardVitestConfig } from "./vitest.project-shard-config.ts";
 import { fullSuiteVitestShards } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.full-auto-reply.config.ts b/test/vitest/vitest.full-auto-reply.config.ts
index a20039f00758..fbf6cfd2f31e 100644
--- a/test/vitest/vitest.full-auto-reply.config.ts
+++ b/test/vitest/vitest.full-auto-reply.config.ts
@@ -1,3 +1,4 @@
+// Vitest full auto reply config wires the full auto reply test shard.
 import { createProjectShardVitestConfig } from "./vitest.project-shard-config.ts";
 import { fullSuiteVitestShards } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.full-core-bundled.config.ts b/test/vitest/vitest.full-core-bundled.config.ts
index c5fd53618621..24037ff83c87 100644
--- a/test/vitest/vitest.full-core-bundled.config.ts
+++ b/test/vitest/vitest.full-core-bundled.config.ts
@@ -1,3 +1,4 @@
+// Vitest full core bundled config wires the full core bundled test shard.
 import { createProjectShardVitestConfig } from "./vitest.project-shard-config.ts";
 import { fullSuiteVitestShards } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.full-core-contracts.config.ts b/test/vitest/vitest.full-core-contracts.config.ts
index 732325de6cf3..f002e4fe1517 100644
--- a/test/vitest/vitest.full-core-contracts.config.ts
+++ b/test/vitest/vitest.full-core-contracts.config.ts
@@ -1,3 +1,4 @@
+// Vitest full core contracts config wires the full core contracts test shard.
 import { createProjectShardVitestConfig } from "./vitest.project-shard-config.ts";
 import { fullSuiteVitestShards } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.full-core-runtime.config.ts b/test/vitest/vitest.full-core-runtime.config.ts
index daa83155a9e9..9ee570e94c40 100644
--- a/test/vitest/vitest.full-core-runtime.config.ts
+++ b/test/vitest/vitest.full-core-runtime.config.ts
@@ -1,3 +1,4 @@
+// Vitest full core runtime config wires the full core runtime test shard.
 import { createProjectShardVitestConfig } from "./vitest.project-shard-config.ts";
 import { fullSuiteVitestShards } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.full-core-support-boundary.config.ts b/test/vitest/vitest.full-core-support-boundary.config.ts
index f484821603e4..439600349fa7 100644
--- a/test/vitest/vitest.full-core-support-boundary.config.ts
+++ b/test/vitest/vitest.full-core-support-boundary.config.ts
@@ -1,3 +1,4 @@
+// Vitest full core support boundary config wires the full core support boundary test shard.
 import { createProjectShardVitestConfig } from "./vitest.project-shard-config.ts";
 import { fullSuiteVitestShards } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.full-core-unit-fast.config.ts b/test/vitest/vitest.full-core-unit-fast.config.ts
index 5a93ed430ec3..2ada04232dd3 100644
--- a/test/vitest/vitest.full-core-unit-fast.config.ts
+++ b/test/vitest/vitest.full-core-unit-fast.config.ts
@@ -1,3 +1,4 @@
+// Vitest full core unit fast config wires the full core unit fast test shard.
 import { defineConfig } from "vitest/config";
 import { sharedVitestConfig } from "./vitest.shared.config.ts";
 
diff --git a/test/vitest/vitest.full-core-unit-security.config.ts b/test/vitest/vitest.full-core-unit-security.config.ts
index ea58fe811a9a..7244f754a923 100644
--- a/test/vitest/vitest.full-core-unit-security.config.ts
+++ b/test/vitest/vitest.full-core-unit-security.config.ts
@@ -1,3 +1,4 @@
+// Vitest full core unit security config wires the full core unit security test shard.
 import { createProjectShardVitestConfig } from "./vitest.project-shard-config.ts";
 import { fullSuiteVitestShards } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.full-core-unit-src.config.ts b/test/vitest/vitest.full-core-unit-src.config.ts
index 3dfd8eb8e66a..8548853abe55 100644
--- a/test/vitest/vitest.full-core-unit-src.config.ts
+++ b/test/vitest/vitest.full-core-unit-src.config.ts
@@ -1,3 +1,4 @@
+// Vitest full core unit src config wires the full core unit src test shard.
 import { createProjectShardVitestConfig } from "./vitest.project-shard-config.ts";
 import { fullSuiteVitestShards } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.full-core-unit-support.config.ts b/test/vitest/vitest.full-core-unit-support.config.ts
index 8554879e63a6..a2601ff47b52 100644
--- a/test/vitest/vitest.full-core-unit-support.config.ts
+++ b/test/vitest/vitest.full-core-unit-support.config.ts
@@ -1,3 +1,4 @@
+// Vitest full core unit support config wires the full core unit support test shard.
 import { createProjectShardVitestConfig } from "./vitest.project-shard-config.ts";
 import { fullSuiteVitestShards } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.full-core-unit-ui.config.ts b/test/vitest/vitest.full-core-unit-ui.config.ts
index d197f5a46d00..e4f37a3babaf 100644
--- a/test/vitest/vitest.full-core-unit-ui.config.ts
+++ b/test/vitest/vitest.full-core-unit-ui.config.ts
@@ -1,3 +1,4 @@
+// Vitest full core unit ui config wires the full core unit ui test shard.
 import { createProjectShardVitestConfig } from "./vitest.project-shard-config.ts";
 import { fullSuiteVitestShards } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.full-core-unit.config.ts b/test/vitest/vitest.full-core-unit.config.ts
index eaba4e1bd1fb..3efc5e5b2114 100644
--- a/test/vitest/vitest.full-core-unit.config.ts
+++ b/test/vitest/vitest.full-core-unit.config.ts
@@ -1,3 +1,4 @@
+// Vitest full core unit config wires the full core unit test shard.
 import { createProjectShardVitestConfig } from "./vitest.project-shard-config.ts";
 import { fullSuiteVitestShards } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.full-extensions.config.ts b/test/vitest/vitest.full-extensions.config.ts
index 8fbea84ed780..fa7b6c968f0e 100644
--- a/test/vitest/vitest.full-extensions.config.ts
+++ b/test/vitest/vitest.full-extensions.config.ts
@@ -1,3 +1,4 @@
+// Vitest full extensions config wires the full extensions test shard.
 import { createProjectShardVitestConfig } from "./vitest.project-shard-config.ts";
 import { fullSuiteVitestShards } from "./vitest.test-shards.mjs";
 
diff --git a/test/vitest/vitest.gateway-client.config.ts b/test/vitest/vitest.gateway-client.config.ts
index 17655ef6e921..feab8c9377d7 100644
--- a/test/vitest/vitest.gateway-client.config.ts
+++ b/test/vitest/vitest.gateway-client.config.ts
@@ -1,3 +1,4 @@
+// Vitest gateway client config wires the gateway client test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createGatewayClientVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.gateway-core.config.ts b/test/vitest/vitest.gateway-core.config.ts
index e831ef93124e..235d6f2fe5dd 100644
--- a/test/vitest/vitest.gateway-core.config.ts
+++ b/test/vitest/vitest.gateway-core.config.ts
@@ -1,3 +1,4 @@
+// Vitest gateway core config wires the gateway core test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 const nonCoreGatewayTestExclude = [
diff --git a/test/vitest/vitest.gateway-methods.config.ts b/test/vitest/vitest.gateway-methods.config.ts
index 0c9bb86960fa..e27c935e5415 100644
--- a/test/vitest/vitest.gateway-methods.config.ts
+++ b/test/vitest/vitest.gateway-methods.config.ts
@@ -1,3 +1,4 @@
+// Vitest gateway methods config wires the gateway methods test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createGatewayMethodsVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.gateway-server.config.ts b/test/vitest/vitest.gateway-server.config.ts
index 304d76eb1f08..7a8aae73adaa 100644
--- a/test/vitest/vitest.gateway-server.config.ts
+++ b/test/vitest/vitest.gateway-server.config.ts
@@ -1,3 +1,4 @@
+// Vitest gateway server config wires the gateway server test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 const gatewayServerBackedHttpTests = [
diff --git a/test/vitest/vitest.gateway.config.ts b/test/vitest/vitest.gateway.config.ts
index 1fb5b565f367..320a81c4e2e1 100644
--- a/test/vitest/vitest.gateway.config.ts
+++ b/test/vitest/vitest.gateway.config.ts
@@ -1,3 +1,4 @@
+// Vitest gateway config wires the gateway test shard.
 import { createProjectShardVitestConfig } from "./vitest.project-shard-config.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
diff --git a/test/vitest/vitest.hooks.config.ts b/test/vitest/vitest.hooks.config.ts
index a1e033ae63b5..c35db9be2617 100644
--- a/test/vitest/vitest.hooks.config.ts
+++ b/test/vitest/vitest.hooks.config.ts
@@ -1,3 +1,4 @@
+// Vitest hooks config wires the hooks test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createHooksVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.infra.config.ts b/test/vitest/vitest.infra.config.ts
index 1de821de8459..081f23c72c19 100644
--- a/test/vitest/vitest.infra.config.ts
+++ b/test/vitest/vitest.infra.config.ts
@@ -1,3 +1,4 @@
+// Vitest infra config wires the infra test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 import { boundaryTestFiles } from "./vitest.unit-paths.mjs";
 
diff --git a/test/vitest/vitest.live.config.ts b/test/vitest/vitest.live.config.ts
index cef7c95c4a2e..d8f515fbcb4b 100644
--- a/test/vitest/vitest.live.config.ts
+++ b/test/vitest/vitest.live.config.ts
@@ -1,3 +1,4 @@
+// Vitest live config wires the live test shard.
 import { defineConfig } from "vitest/config";
 import { BUNDLED_PLUGIN_LIVE_TEST_GLOB } from "./vitest.bundled-plugin-paths.ts";
 import baseConfig from "./vitest.config.ts";
diff --git a/test/vitest/vitest.logging.config.ts b/test/vitest/vitest.logging.config.ts
index 5b68127a5f09..b1cb6c73880a 100644
--- a/test/vitest/vitest.logging.config.ts
+++ b/test/vitest/vitest.logging.config.ts
@@ -1,3 +1,4 @@
+// Vitest logging config wires the logging test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createLoggingVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.media-understanding.config.ts b/test/vitest/vitest.media-understanding.config.ts
index ed52290989ab..ce4a75ba1fac 100644
--- a/test/vitest/vitest.media-understanding.config.ts
+++ b/test/vitest/vitest.media-understanding.config.ts
@@ -1,3 +1,4 @@
+// Vitest media understanding config wires the media understanding test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createMediaUnderstandingVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.media.config.ts b/test/vitest/vitest.media.config.ts
index a97382525f29..395d8abf345f 100644
--- a/test/vitest/vitest.media.config.ts
+++ b/test/vitest/vitest.media.config.ts
@@ -1,3 +1,4 @@
+// Vitest media config wires the media test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createMediaVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.pattern-file.ts b/test/vitest/vitest.pattern-file.ts
index 93bd456181c8..cab6159362a2 100644
--- a/test/vitest/vitest.pattern-file.ts
+++ b/test/vitest/vitest.pattern-file.ts
@@ -1,3 +1,4 @@
+// Vitest pattern file helper reads include and exclude patterns from files.
 import fs from "node:fs";
 import path from "node:path";
 
diff --git a/test/vitest/vitest.performance-config.ts b/test/vitest/vitest.performance-config.ts
index 565dd672edc7..c0976c0a1789 100644
--- a/test/vitest/vitest.performance-config.ts
+++ b/test/vitest/vitest.performance-config.ts
@@ -1,3 +1,4 @@
+// Vitest performance config helper normalizes performance test environment settings.
 type EnvMap = Record<string, string | undefined>;
 
 const isEnabled = (value: string | undefined): boolean => {
diff --git a/test/vitest/vitest.plugin-sdk-light.config.ts b/test/vitest/vitest.plugin-sdk-light.config.ts
index b84e0c38ba4f..d24cd6523b8f 100644
--- a/test/vitest/vitest.plugin-sdk-light.config.ts
+++ b/test/vitest/vitest.plugin-sdk-light.config.ts
@@ -1,3 +1,4 @@
+// Vitest plugin sdk light config wires the plugin sdk light test shard.
 import { pluginSdkLightTestFiles } from "./vitest.plugin-sdk-paths.mjs";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 import { getUnitFastTestFiles } from "./vitest.unit-fast-paths.mjs";
diff --git a/test/vitest/vitest.plugin-sdk.config.ts b/test/vitest/vitest.plugin-sdk.config.ts
index 0125d42fdd3f..670b74fddd1a 100644
--- a/test/vitest/vitest.plugin-sdk.config.ts
+++ b/test/vitest/vitest.plugin-sdk.config.ts
@@ -1,3 +1,4 @@
+// Vitest plugin sdk config wires the plugin sdk test shard.
 import { pluginSdkLightTestFiles } from "./vitest.plugin-sdk-paths.mjs";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 import { bundledPluginDependentUnitTestFiles } from "./vitest.unit-paths.mjs";
diff --git a/test/vitest/vitest.plugins.config.ts b/test/vitest/vitest.plugins.config.ts
index 64b9ea1cfd61..c3313756b6e6 100644
--- a/test/vitest/vitest.plugins.config.ts
+++ b/test/vitest/vitest.plugins.config.ts
@@ -1,3 +1,4 @@
+// Vitest plugins config wires the plugins test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createPluginsVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.process.config.ts b/test/vitest/vitest.process.config.ts
index f10414d6d1de..4a122d597bd9 100644
--- a/test/vitest/vitest.process.config.ts
+++ b/test/vitest/vitest.process.config.ts
@@ -1,3 +1,4 @@
+// Vitest process config wires the process test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createProcessVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.project-shard-config.ts b/test/vitest/vitest.project-shard-config.ts
index 386a4ebbd11d..743bd62ecd2f 100644
--- a/test/vitest/vitest.project-shard-config.ts
+++ b/test/vitest/vitest.project-shard-config.ts
@@ -1,3 +1,4 @@
+// Vitest project shard helper builds configs for full-suite shards.
 import { defineConfig } from "vitest/config";
 import { nonIsolatedRunnerPath, sharedVitestConfig } from "./vitest.shared.config.ts";
 
diff --git a/test/vitest/vitest.runtime-config.config.ts b/test/vitest/vitest.runtime-config.config.ts
index c93c01406113..c09b97f0653b 100644
--- a/test/vitest/vitest.runtime-config.config.ts
+++ b/test/vitest/vitest.runtime-config.config.ts
@@ -1,3 +1,4 @@
+// Vitest runtime config config wires the runtime config test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createRuntimeConfigVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.scoped-config.ts b/test/vitest/vitest.scoped-config.ts
index daf256221b4f..ad5d4fdb4687 100644
--- a/test/vitest/vitest.scoped-config.ts
+++ b/test/vitest/vitest.scoped-config.ts
@@ -1,3 +1,4 @@
+// Vitest scoped config helper builds test configs for scoped file patterns.
 import path from "node:path";
 import { defineConfig } from "vitest/config";
 import { loadPatternListFromEnv, narrowIncludePatternsForCli } from "./vitest.pattern-file.ts";
diff --git a/test/vitest/vitest.secrets.config.ts b/test/vitest/vitest.secrets.config.ts
index dc583872ec90..e03439ac42aa 100644
--- a/test/vitest/vitest.secrets.config.ts
+++ b/test/vitest/vitest.secrets.config.ts
@@ -1,3 +1,4 @@
+// Vitest secrets config wires the secrets test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createSecretsVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.shared-core.config.ts b/test/vitest/vitest.shared-core.config.ts
index da102561c094..7eacf2ca4ebf 100644
--- a/test/vitest/vitest.shared-core.config.ts
+++ b/test/vitest/vitest.shared-core.config.ts
@@ -1,3 +1,4 @@
+// Vitest shared core config wires the shared core test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 import { getUnitFastTestFiles } from "./vitest.unit-fast-paths.mjs";
 
diff --git a/test/vitest/vitest.shared.config.ts b/test/vitest/vitest.shared.config.ts
index 22e3f57cf50b..5a95d8d92d2b 100644
--- a/test/vitest/vitest.shared.config.ts
+++ b/test/vitest/vitest.shared.config.ts
@@ -1,3 +1,4 @@
+// Vitest shared config wires the shared test shard.
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 import acpCorePackageJson from "../../packages/acp-core/package.json" with { type: "json" };
diff --git a/test/vitest/vitest.system-load.ts b/test/vitest/vitest.system-load.ts
index 84234e5bf812..57db87312651 100644
--- a/test/vitest/vitest.system-load.ts
+++ b/test/vitest/vitest.system-load.ts
@@ -1,3 +1,4 @@
+// Vitest system load helper probes host load before expensive test lanes.
 import { spawnSync } from "node:child_process";
 
 type EnvMap = Record<string, string | undefined>;
diff --git a/test/vitest/vitest.tasks.config.ts b/test/vitest/vitest.tasks.config.ts
index a0f5515d8a23..d4ff7d684731 100644
--- a/test/vitest/vitest.tasks.config.ts
+++ b/test/vitest/vitest.tasks.config.ts
@@ -1,3 +1,4 @@
+// Vitest tasks config wires the tasks test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createTasksVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.tooling-isolated.config.ts b/test/vitest/vitest.tooling-isolated.config.ts
index 291d3211d025..fd132e0d28c9 100644
--- a/test/vitest/vitest.tooling-isolated.config.ts
+++ b/test/vitest/vitest.tooling-isolated.config.ts
@@ -1,3 +1,4 @@
+// Vitest tooling isolated config wires the tooling isolated test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createToolingIsolatedVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.tooling.config.ts b/test/vitest/vitest.tooling.config.ts
index c44297b955b9..95252012681a 100644
--- a/test/vitest/vitest.tooling.config.ts
+++ b/test/vitest/vitest.tooling.config.ts
@@ -1,3 +1,4 @@
+// Vitest tooling config wires the tooling test shard.
 import { loadPatternListFromEnv } from "./vitest.pattern-file.ts";
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 import { boundaryTestFiles } from "./vitest.unit-paths.mjs";
diff --git a/test/vitest/vitest.tui-pty.config.ts b/test/vitest/vitest.tui-pty.config.ts
index 4e9c3fcab42c..4f17be874304 100644
--- a/test/vitest/vitest.tui-pty.config.ts
+++ b/test/vitest/vitest.tui-pty.config.ts
@@ -1,3 +1,4 @@
+// Vitest tui pty config wires the tui pty test shard.
 import { defineConfig } from "vitest/config";
 import { loadPatternListFromEnv, narrowIncludePatternsForCli } from "./vitest.pattern-file.ts";
 import { resolveRepoRootPath, sharedVitestConfig } from "./vitest.shared.config.ts";
diff --git a/test/vitest/vitest.tui.config.ts b/test/vitest/vitest.tui.config.ts
index b5c4eeac9c5d..ba4f4c759214 100644
--- a/test/vitest/vitest.tui.config.ts
+++ b/test/vitest/vitest.tui.config.ts
@@ -1,3 +1,4 @@
+// Vitest tui config wires the tui test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createTuiVitestConfig(env?: Record<string, string | undefined>) {
diff --git a/test/vitest/vitest.ui-e2e.config.ts b/test/vitest/vitest.ui-e2e.config.ts
index 791eef057d60..88145b7f0fd9 100644
--- a/test/vitest/vitest.ui-e2e.config.ts
+++ b/test/vitest/vitest.ui-e2e.config.ts
@@ -1,3 +1,4 @@
+// Vitest ui e2e config wires the ui e2e test shard.
 import { defineConfig } from "vitest/config";
 import { loadPatternListFromEnv, narrowIncludePatternsForCli } from "./vitest.pattern-file.ts";
 import { sharedVitestConfig } from "./vitest.shared.config.ts";
diff --git a/test/vitest/vitest.ui.config.ts b/test/vitest/vitest.ui.config.ts
index e10dcb031fdc..1a11be7e58d8 100644
--- a/test/vitest/vitest.ui.config.ts
+++ b/test/vitest/vitest.ui.config.ts
@@ -1,3 +1,4 @@
+// Vitest ui config wires the ui test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 import { jsdomOptimizedDeps } from "./vitest.shared.config.ts";
 import { unitUiIncludePatterns } from "./vitest.ui-paths.mjs";
diff --git a/test/vitest/vitest.unit-fast-fake-timers.config.ts b/test/vitest/vitest.unit-fast-fake-timers.config.ts
index 31e6f6f61b6a..9ac85847168a 100644
--- a/test/vitest/vitest.unit-fast-fake-timers.config.ts
+++ b/test/vitest/vitest.unit-fast-fake-timers.config.ts
@@ -1,3 +1,4 @@
+// Vitest unit fast fake timers config wires the unit fast fake timers test shard.
 import { defineConfig } from "vitest/config";
 import { loadPatternListFromEnv, narrowIncludePatternsForCli } from "./vitest.pattern-file.ts";
 import { nonIsolatedRunnerPath, sharedVitestConfig } from "./vitest.shared.config.ts";
diff --git a/test/vitest/vitest.unit-fast.config.ts b/test/vitest/vitest.unit-fast.config.ts
index 41a133af45d7..43b5df6aa204 100644
--- a/test/vitest/vitest.unit-fast.config.ts
+++ b/test/vitest/vitest.unit-fast.config.ts
@@ -1,3 +1,4 @@
+// Vitest unit fast config wires the unit fast test shard.
 import { defineConfig } from "vitest/config";
 import { loadPatternListFromEnv, narrowIncludePatternsForCli } from "./vitest.pattern-file.ts";
 import { sharedVitestConfig } from "./vitest.shared.config.ts";
diff --git a/test/vitest/vitest.unit-security.config.ts b/test/vitest/vitest.unit-security.config.ts
index c62a6f854466..a1e08d2fc9b2 100644
--- a/test/vitest/vitest.unit-security.config.ts
+++ b/test/vitest/vitest.unit-security.config.ts
@@ -1,3 +1,4 @@
+// Vitest unit security config wires the unit security test shard.
 import { createUnitVitestConfigWithOptions } from "./vitest.unit.config.ts";
 
 export default createUnitVitestConfigWithOptions(process.env, {
diff --git a/test/vitest/vitest.unit-src.config.ts b/test/vitest/vitest.unit-src.config.ts
index b0d8a4a92d95..d18c3fb1a9fc 100644
--- a/test/vitest/vitest.unit-src.config.ts
+++ b/test/vitest/vitest.unit-src.config.ts
@@ -1,3 +1,4 @@
+// Vitest unit src config wires the unit src test shard.
 import { createUnitVitestConfigWithOptions } from "./vitest.unit.config.ts";
 
 export default createUnitVitestConfigWithOptions(process.env, {
diff --git a/test/vitest/vitest.unit-support.config.ts b/test/vitest/vitest.unit-support.config.ts
index 06f4752538ad..6ab1e346ea8a 100644
--- a/test/vitest/vitest.unit-support.config.ts
+++ b/test/vitest/vitest.unit-support.config.ts
@@ -1,3 +1,4 @@
+// Vitest unit support config wires the unit support test shard.
 import { createUnitVitestConfigWithOptions } from "./vitest.unit.config.ts";
 
 export default createUnitVitestConfigWithOptions(process.env, {
diff --git a/test/vitest/vitest.unit-ui.config.ts b/test/vitest/vitest.unit-ui.config.ts
index 61af2c16c018..253193fae277 100644
--- a/test/vitest/vitest.unit-ui.config.ts
+++ b/test/vitest/vitest.unit-ui.config.ts
@@ -1,3 +1,4 @@
+// Vitest unit ui config wires the unit ui test shard.
 import { unitUiIncludePatterns } from "./vitest.ui-paths.mjs";
 import { createUiVitestConfig } from "./vitest.ui.config.ts";
 
diff --git a/test/vitest/vitest.unit.config.ts b/test/vitest/vitest.unit.config.ts
index 73459942d796..78bb950144d3 100644
--- a/test/vitest/vitest.unit.config.ts
+++ b/test/vitest/vitest.unit.config.ts
@@ -1,3 +1,4 @@
+// Vitest unit config wires the unit test shard.
 import fs from "node:fs";
 import path from "node:path";
 import { defineConfig } from "vitest/config";
diff --git a/test/vitest/vitest.utils.config.ts b/test/vitest/vitest.utils.config.ts
index afc36f9a16f1..04a47a03e8d0 100644
--- a/test/vitest/vitest.utils.config.ts
+++ b/test/vitest/vitest.utils.config.ts
@@ -1,3 +1,4 @@
+// Vitest utils config wires the utils test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 import { getUnitFastTestFiles } from "./vitest.unit-fast-paths.mjs";
 
diff --git a/test/vitest/vitest.wizard.config.ts b/test/vitest/vitest.wizard.config.ts
index 9af10e1e2bc7..cb7a53cdaf2c 100644
--- a/test/vitest/vitest.wizard.config.ts
+++ b/test/vitest/vitest.wizard.config.ts
@@ -1,3 +1,4 @@
+// Vitest wizard config wires the wizard test shard.
 import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createWizardVitestConfig(env?: Record<string, string | undefined>) {