diff --git a/README.md b/README.md
index 84ceeb9..f3f4c4b 100644
--- a/README.md
+++ b/README.md
@@ -439,14 +439,13 @@ Since you already scoped the build to just the Actor(s) you care about, point vi
 
 #### 5. Run tests against the builds
 
-Pass the build output as `ACTOR_BUILDS` and provide `TESTER_APIFY_TOKEN`. The token can point to your own account (if you have enough memory) or you can use the testing account (xRGg9iAfJSymqartk).
+Pass the build output as `ACTOR_BUILDS` and provide `TESTER_APIFY_TOKEN`. The token can point to your own account (if you have enough memory) or you can use the testing account (xRGg9iAfJSymqartk). Platform test suites are skipped unless `TESTER_APIFY_TOKEN` is set, so regular unit test runs stay unaffected.
 
 If you want to run only certain tests, change the `test/platform` to be more specific.
 
 ```bash
 ACTOR_BUILDS='<JSON output from build command>' \
 TESTER_APIFY_TOKEN=<token> \
-RUN_PLATFORM_TESTS=1 \
   npx vitest --run --maxConcurrency 20 --fileParallelism=true --maxWorkers 100 test/platform
 ```
 
@@ -463,7 +462,6 @@ BUILDS=$(APIFY_TOKEN_JOHN_DOE=apify_api_xxx \
 # Run tests with the builds
 ACTOR_BUILDS="$BUILDS" \
 TESTER_APIFY_TOKEN=apify_api_yyy \
-RUN_PLATFORM_TESTS=1 \
   npx vitest --run --maxConcurrency 20 --fileParallelism=true --maxWorkers 100 test/platform
 ```
 
diff --git a/lib/lib.ts b/lib/lib.ts
index 5c83f31..7756bde 100644
--- a/lib/lib.ts
+++ b/lib/lib.ts
@@ -31,7 +31,7 @@ const config = actorBuilds.reduce<Map<string, ActorBuild>>((map, cfg) => {
 
 export { ExpectStatic };
 
-const { TESTER_APIFY_TOKEN, RUN_PLATFORM_TESTS, RUN_ALL_PLATFORM_TESTS } = process.env;
+const { TESTER_APIFY_TOKEN, RUN_ALL_PLATFORM_TESTS } = process.env;
 const apifyClient = new ApifyClient({ token: TESTER_APIFY_TOKEN });
 
 const DEFAULT_TEST_OPTIONS: ActorTestOptions = {
@@ -41,8 +41,14 @@ const DEFAULT_TEST_OPTIONS: ActorTestOptions = {
     timeout: DEFAULT_TEST_RUN_DURATION_MS,
 };
 
+/**
+ * Platform tests need `TESTER_APIFY_TOKEN` to talk to the platform, so without it we skip them altogether.
+ *
+ * `RUN_ALL_PLATFORM_TESTS` enables them too because locally we can test against a hardcoded `runId`,
+ * which doesn't need the tester token.
+ */
 export const describe = (name: string, fn?: SuiteFactory<object>, options: ActorTestOptions = DEFAULT_TEST_OPTIONS) => {
-    vitestDescribe.runIf(!!RUN_PLATFORM_TESTS || !!RUN_ALL_PLATFORM_TESTS)(name, options, fn);
+    vitestDescribe.runIf(!!TESTER_APIFY_TOKEN || !!RUN_ALL_PLATFORM_TESTS)(name, options, fn);
 };
 
 const DEFAULT_TEST_ACTOR_OPTIONS: ActorTestOptions = {
@@ -65,6 +71,8 @@ export const testActor = <T>(
         ...testOptions,
     };
     const name = `${actorId}: ${testName}`;
+    // `RUN_ALL_PLATFORM_TESTS` is needed for the scheduled tests, which have no `ACTOR_BUILDS` to match the
+    // tests against - without it, every test would be filtered out as an actor we didn't build.
     const shouldRun = !!RUN_ALL_PLATFORM_TESTS || config.has(actorId);
     vitestTest.runIf(shouldRun)(name, options, async <TYPE extends TestContext>(context: TYPE) => {
         const { expect, ...rest } = context;
@@ -97,6 +105,8 @@ export const testStandbyActor = <I = any, O = any>(
         ...testOptions,
     };
     const name = `${actorId}: ${testName}`;
+    // `RUN_ALL_PLATFORM_TESTS` is needed for the scheduled tests, which have no `ACTOR_BUILDS` to match the
+    // tests against - without it, every test would be filtered out as an actor we didn't build.
     const shouldRun = !!RUN_ALL_PLATFORM_TESTS || config.has(actorId);
 
     vitestTest.runIf(shouldRun)(name, options, async <T extends TestContext>(context: T) => {