diff --git a/README.md b/README.md
index 8589fa1..8b857b0 100644
--- a/README.md
+++ b/README.md
@@ -103,12 +103,12 @@ SlashCommandBotBuilder[IO](secret)
 `CommandMapper[F]` is a type alias for: 
 
 ```scala
-SlashCommandPayload => Command[F]
+SlashCommandPayload => F[Command[F]]
 ```
 
-Your implementation of this function defines your business logic.  The input is the slash command request from Slack. The output defines how to respond to that request.
+Your implementation of this effect defines your business logic.  The input is the slash command request from Slack. The output defines how to respond to that request.
 
-Slack4s will only invoke this function if the incoming request's slack signature has been validated against your signing secret.
+Slack4s will only evaluate this effect if the incoming request's slack signature has been validated against your signing secret.
 
 ### `SlashCommandPayload`
  
diff --git a/src/main/scala/io/laserdisc/slack4s/slashcmd/CommandMapper.scala b/src/main/scala/io/laserdisc/slack4s/slashcmd/CommandMapper.scala
index 6b61b0c..a999c6e 100644
--- a/src/main/scala/io/laserdisc/slack4s/slashcmd/CommandMapper.scala
+++ b/src/main/scala/io/laserdisc/slack4s/slashcmd/CommandMapper.scala
@@ -13,15 +13,17 @@ object CommandMapper {
   // $COVERAGE-OFF$
   def default[F[_]: Sync]: CommandMapper[F] =
     (payload: SlashCommandPayload) =>
-      Command(
-        handler = getLogger
-          .warn(
-            s"Responding with default message; To configure your own processor, see $ProjectRepo"
-          )
-          .as(helloFromSlack4s(payload)),
-        responseType = Immediate,
-        logId = "GETTING-STARTED"
-      )
+      Sync[F].delay {
+        Command(
+          handler = getLogger
+            .warn(
+              s"Responding with default message; To configure your own processor, see $ProjectRepo"
+            )
+            .as(helloFromSlack4s(payload)),
+          responseType = Immediate,
+          logId = "GETTING-STARTED"
+        )
+      }
   // $COVERAGE-ON$
 
 }
diff --git a/src/main/scala/io/laserdisc/slack4s/slashcmd/internal/CommandRunner.scala b/src/main/scala/io/laserdisc/slack4s/slashcmd/internal/CommandRunner.scala
index 2df0bb5..793dc7b 100644
--- a/src/main/scala/io/laserdisc/slack4s/slashcmd/internal/CommandRunner.scala
+++ b/src/main/scala/io/laserdisc/slack4s/slashcmd/internal/CommandRunner.scala
@@ -100,8 +100,8 @@ class CommandRunnerImpl[F[_]: Async](
   override def processRequest(ar: AuthedRequest[F, SlackUser]): F[Response[F]] =
     ar.req.decode[SlashCommandPayload] { payload =>
       for {
-        _ <- logger.info(s"PARSE-CMD cmdId=${payload.requestId}  payload:'$payload'")
-        cmd = mapper(payload)
+        _   <- logger.info(s"PARSE-CMD cmdId=${payload.requestId}  payload:'$payload'")
+        cmd <- mapper(payload)
         _ <- logger.info(
           s"COMMAND-SELECT cmdId:${cmd.logId} reqId=${payload.requestId} user:${payload.getUserName}(${payload.getUserId}) text:'${payload.getText}' responseType:${cmd.responseType}"
         )
diff --git a/src/main/scala/io/laserdisc/slack4s/slashcmd/package.scala b/src/main/scala/io/laserdisc/slack4s/slashcmd/package.scala
index 2c99477..7ec6eaa 100644
--- a/src/main/scala/io/laserdisc/slack4s/slashcmd/package.scala
+++ b/src/main/scala/io/laserdisc/slack4s/slashcmd/package.scala
@@ -20,6 +20,6 @@ package object slashcmd {
   object BindPort      extends RefinedTypeOps[BindPort, Int]
   object BindAddress   extends RefinedTypeOps[BindAddress, String]
 
-  type CommandMapper[F[_]] = SlashCommandPayload => Command[F]
+  type CommandMapper[F[_]] = SlashCommandPayload => F[Command[F]]
 
 }
diff --git a/src/test/scala/examples/SpaceNewsExample.scala b/src/test/scala/examples/SpaceNewsExample.scala
index b9a3773..a45ee10 100644
--- a/src/test/scala/examples/SpaceNewsExample.scala
+++ b/src/test/scala/examples/SpaceNewsExample.scala
@@ -27,24 +27,28 @@ object SpaceNewsExample extends IOApp.Simple {
   def mapper: CommandMapper[IO] = { (payload: SlashCommandPayload) =>
     payload.getText.trim match {
       case "" =>
-        Command(
-          handler = IO.pure(slackMessage(headerSection("Please provide a search term!"))),
-          responseType = Immediate
+        IO(
+          Command(
+            handler = IO.pure(slackMessage(headerSection("Please provide a search term!"))),
+            responseType = Immediate
+          )
         )
       case searchTerm =>
-        Command(
-          handler = querySpaceNews(searchTerm).map {
-            case Seq() =>
-              slackMessage(
-                headerSection(s"No results for: $searchTerm")
-              )
-            case articles =>
-              slackMessage(
-                headerSection(s"Space news results for: $searchTerm")
-                  +: articles.flatMap(formatNewsArticle)
-              )
-          },
-          responseType = Delayed
+        IO(
+          Command(
+            handler = querySpaceNews(searchTerm).map {
+              case Seq() =>
+                slackMessage(
+                  headerSection(s"No results for: $searchTerm")
+                )
+              case articles =>
+                slackMessage(
+                  headerSection(s"Space news results for: $searchTerm")
+                    +: articles.flatMap(formatNewsArticle)
+                )
+            },
+            responseType = Delayed
+          )
         )
     }
   }
diff --git a/src/test/scala/io/laserdisc/slack4s/slashcmd/internal/CommandRunnerTest.scala b/src/test/scala/io/laserdisc/slack4s/slashcmd/internal/CommandRunnerTest.scala
index ea5a64c..a205265 100644
--- a/src/test/scala/io/laserdisc/slack4s/slashcmd/internal/CommandRunnerTest.scala
+++ b/src/test/scala/io/laserdisc/slack4s/slashcmd/internal/CommandRunnerTest.scala
@@ -19,9 +19,11 @@ class CommandRunnerTest extends SlashCommandSuite {
 
     val (response, callbacks) = testSlashCmdService(
       payload =>
-        Command(
-          handler = IO.pure(slackMessage(textSection(s"hello ${payload.getText}"))),
-          responseType = Immediate
+        IO(
+          Command(
+            handler = IO.pure(slackMessage(textSection(s"hello ${payload.getText}"))),
+            responseType = Immediate
+          )
         ),
       signedSlashCmdRequest(text = "lenny"),
       waitForCallbacks
@@ -41,9 +43,11 @@ class CommandRunnerTest extends SlashCommandSuite {
 
     val (response, callbacks) = testSlashCmdService(
       payload =>
-        Command(
-          handler = IO.pure(slackMessage(headerSection(s"--- ${payload.getText} ---"))),
-          responseType = Delayed
+        IO(
+          Command(
+            handler = IO.pure(slackMessage(headerSection(s"--- ${payload.getText} ---"))),
+            responseType = Delayed
+          )
         ),
       signedSlashCmdRequest(text = "foo bar", responseURL = CallbackURL),
       waitForCallbacks
@@ -68,9 +72,11 @@ class CommandRunnerTest extends SlashCommandSuite {
 
     val (response, callbacks) = testSlashCmdService(
       payload =>
-        Command(
-          handler = IO.pure(slackMessage(markdownSection(s"you sent: ${payload.getText}"))),
-          responseType = DelayedWithMsg(DelayMessage)
+        IO(
+          Command(
+            handler = IO.pure(slackMessage(markdownSection(s"you sent: ${payload.getText}"))),
+            responseType = DelayedWithMsg(DelayMessage)
+          )
         ),
       signedSlashCmdRequest(text = "woof", responseURL = CallbackURL),
       waitForCallbacks
diff --git a/src/test/scala/io/laserdisc/slack4s/slashcmd/internal/SignatureValidatorTest.scala b/src/test/scala/io/laserdisc/slack4s/slashcmd/internal/SignatureValidatorTest.scala
index 02faabf..93d16e9 100644
--- a/src/test/scala/io/laserdisc/slack4s/slashcmd/internal/SignatureValidatorTest.scala
+++ b/src/test/scala/io/laserdisc/slack4s/slashcmd/internal/SignatureValidatorTest.scala
@@ -122,8 +122,10 @@ class SignatureValidatorTest extends SlashCommandSuite {
   }
 
   lazy val defaultMapper: CommandMapper[IO] = payload =>
-    Command(
-      handler = IO.pure(slackMessage(textSection(s"hello ${payload.getText}"))),
-      responseType = Immediate
+    IO(
+      Command(
+        handler = IO.pure(slackMessage(textSection(s"hello ${payload.getText}"))),
+        responseType = Immediate
+      )
     )
 }