diff --git a/build.sbt b/build.sbt
index d1b6ab7..80f8dec 100644
--- a/build.sbt
+++ b/build.sbt
@@ -89,6 +89,7 @@ lazy val api = project
   )
   .settings(
     libraryDependencies ++= Seq(
+      Deps.Gs.Uuid,
       Deps.Cats.Core,
       Deps.Cats.Effect,
       Deps.Natchez.Core
@@ -106,7 +107,6 @@ lazy val runtime = project
   )
   .settings(
     libraryDependencies ++= Seq(
-      Deps.Gs.Uuid,
       Deps.Gs.Timing,
       Deps.Cats.Core,
       Deps.Cats.Effect,
diff --git a/modules/runtime/src/main/scala/gs/test/v0/runtime/SuiteExecution.scala b/modules/api/src/main/scala/gs/test/v0/api/SuiteExecution.scala
similarity index 91%
rename from modules/runtime/src/main/scala/gs/test/v0/runtime/SuiteExecution.scala
rename to modules/api/src/main/scala/gs/test/v0/api/SuiteExecution.scala
index aa2a29d..64a75a6 100644
--- a/modules/runtime/src/main/scala/gs/test/v0/runtime/SuiteExecution.scala
+++ b/modules/api/src/main/scala/gs/test/v0/api/SuiteExecution.scala
@@ -1,4 +1,4 @@
-package gs.test.v0.runtime
+package gs.test.v0.api
 
 import gs.uuid.v0.UUID
 import java.time.Instant
diff --git a/modules/runtime/src/main/scala/gs/test/v0/runtime/TestExecution.scala b/modules/api/src/main/scala/gs/test/v0/api/TestExecution.scala
similarity index 91%
rename from modules/runtime/src/main/scala/gs/test/v0/runtime/TestExecution.scala
rename to modules/api/src/main/scala/gs/test/v0/api/TestExecution.scala
index 2d779d0..cca8546 100644
--- a/modules/runtime/src/main/scala/gs/test/v0/runtime/TestExecution.scala
+++ b/modules/api/src/main/scala/gs/test/v0/api/TestExecution.scala
@@ -1,11 +1,6 @@
-package gs.test.v0.runtime
+package gs.test.v0.api
 
 import cats.Show
-import gs.test.v0.api.Marker
-import gs.test.v0.api.PermanentId
-import gs.test.v0.api.SourcePosition
-import gs.test.v0.api.Tag
-import gs.test.v0.api.TestFailure
 import gs.uuid.v0.UUID
 import scala.concurrent.duration.FiniteDuration
 
diff --git a/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/EngineResult.scala b/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/EngineResult.scala
deleted file mode 100644
index 2b19bdc..0000000
--- a/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/EngineResult.scala
+++ /dev/null
@@ -1,7 +0,0 @@
-package gs.test.v0.runtime.engine
-
-import gs.test.v0.runtime.SuiteExecution
-
-final class EngineResult(
-  val suiteExecution: SuiteExecution
-)
diff --git a/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/EngineStats.scala b/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/EngineStats.scala
index da4eb7f..e7a5b5b 100644
--- a/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/EngineStats.scala
+++ b/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/EngineStats.scala
@@ -3,7 +3,7 @@ package gs.test.v0.runtime.engine
 import cats.effect.Async
 import cats.effect.Ref
 import cats.syntax.all.*
-import gs.test.v0.runtime.TestExecution
+import gs.test.v0.api.TestExecution
 import java.util.concurrent.TimeUnit
 import scala.concurrent.duration.FiniteDuration
 
diff --git a/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/GroupResult.scala b/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/GroupResult.scala
index dbd207a..e306f77 100644
--- a/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/GroupResult.scala
+++ b/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/GroupResult.scala
@@ -1,7 +1,7 @@
 package gs.test.v0.runtime.engine
 
+import gs.test.v0.api.TestExecution
 import gs.test.v0.api.TestGroupDefinition
-import gs.test.v0.runtime.TestExecution
 import scala.concurrent.duration.FiniteDuration
 
 /** Represents the results of executing an entire group of tests.
diff --git a/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/TestEngine.scala b/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/TestEngine.scala
index 9d9246e..7239cfd 100644
--- a/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/TestEngine.scala
+++ b/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/TestEngine.scala
@@ -2,12 +2,12 @@ package gs.test.v0.runtime.engine
 
 import cats.effect.Async
 import cats.syntax.all.*
+import gs.test.v0.api.SuiteExecution
 import gs.test.v0.api.TestDefinition
+import gs.test.v0.api.TestExecution
 import gs.test.v0.api.TestFailure
 import gs.test.v0.api.TestGroupDefinition
 import gs.test.v0.api.TestSuite
-import gs.test.v0.runtime.SuiteExecution
-import gs.test.v0.runtime.TestExecution
 import gs.timing.v0.Timing
 import gs.uuid.v0.UUID
 import java.time.Clock