diff --git a/src/autorouter/autoroute.rs b/src/autorouter/autoroute.rs
index cb0d258..e7a4744 100644
--- a/src/autorouter/autoroute.rs
+++ b/src/autorouter/autoroute.rs
@@ -30,14 +30,14 @@ impl TryInto<()> for AutorouteStatus {
     }
 }
 
-pub struct AutorouteCommandStepper {
+pub struct AutorouteExecutionStepper {
     ratlines_iter: Box<dyn Iterator<Item = EdgeIndex<usize>>>,
     options: AutorouterOptions,
     route: Option<RouteStepper>,
     curr_ratline: Option<EdgeIndex<usize>>,
 }
 
-impl AutorouteCommandStepper {
+impl AutorouteExecutionStepper {
     pub fn new(
         autorouter: &mut Autorouter<impl AccessMesadata>,
         ratlines: impl IntoIterator<Item = EdgeIndex<usize>> + 'static,
@@ -64,7 +64,7 @@ impl AutorouteCommandStepper {
 }
 
 impl<M: AccessMesadata> Step<Autorouter<M>, AutorouteStatus, AutorouterError, ()>
-    for AutorouteCommandStepper
+    for AutorouteExecutionStepper
 {
     fn step(&mut self, autorouter: &mut Autorouter<M>) -> Result<AutorouteStatus, AutorouterError> {
         let Some(curr_ratline) = self.curr_ratline else {
@@ -119,25 +119,25 @@ impl<M: AccessMesadata> Step<Autorouter<M>, AutorouteStatus, AutorouterError, ()
     }
 }
 
-impl GetMaybeNavmesh for AutorouteCommandStepper {
+impl GetMaybeNavmesh for AutorouteExecutionStepper {
     fn maybe_navmesh(&self) -> Option<&Navmesh> {
         self.route.as_ref().map(|route| route.navmesh())
     }
 }
 
-impl GetMaybeTrace for AutorouteCommandStepper {
+impl GetMaybeTrace for AutorouteExecutionStepper {
     fn maybe_trace(&self) -> Option<&TraceStepper> {
         self.route.as_ref().map(|route| route.trace())
     }
 }
 
-impl GetGhosts for AutorouteCommandStepper {
+impl GetGhosts for AutorouteExecutionStepper {
     fn ghosts(&self) -> &[PrimitiveShape] {
         self.route.as_ref().map_or(&[], |route| route.ghosts())
     }
 }
 
-impl GetObstacles for AutorouteCommandStepper {
+impl GetObstacles for AutorouteExecutionStepper {
     fn obstacles(&self) -> &[PrimitiveIndex] {
         self.route.as_ref().map_or(&[], |route| route.obstacles())
     }
diff --git a/src/autorouter/autorouter.rs b/src/autorouter/autorouter.rs
index 9bd7235..cbf05d7 100644
--- a/src/autorouter/autorouter.rs
+++ b/src/autorouter/autorouter.rs
@@ -16,12 +16,12 @@ use crate::{
 };
 
 use super::{
-    autoroute::AutorouteCommandStepper,
-    compare_detours::CompareDetoursCommandStepper,
-    measure_length::MeasureLengthCommandStepper,
-    place_via::PlaceViaCommandStepper,
+    autoroute::AutorouteExecutionStepper,
+    compare_detours::CompareDetoursExecutionStepper,
+    measure_length::MeasureLengthExecutionStepper,
+    place_via::PlaceViaExecutionStepper,
     ratsnest::{Ratsnest, RatvertexIndex},
-    remove_bands::RemoveBandsCommandStepper,
+    remove_bands::RemoveBandsExecutionStepper,
     selection::{BandSelection, PinSelection},
 };
 
@@ -62,7 +62,7 @@ impl<M: AccessMesadata> Autorouter<M> {
         &mut self,
         selection: &PinSelection,
         options: AutorouterOptions,
-    ) -> Result<AutorouteCommandStepper, AutorouterError> {
+    ) -> Result<AutorouteExecutionStepper, AutorouterError> {
         self.autoroute_ratlines(self.selected_ratlines(selection), options)
     }
 
@@ -70,8 +70,8 @@ impl<M: AccessMesadata> Autorouter<M> {
         &mut self,
         ratlines: Vec<EdgeIndex<usize>>,
         options: AutorouterOptions,
-    ) -> Result<AutorouteCommandStepper, AutorouterError> {
-        AutorouteCommandStepper::new(self, ratlines, options)
+    ) -> Result<AutorouteExecutionStepper, AutorouterError> {
+        AutorouteExecutionStepper::new(self, ratlines, options)
     }
 
     pub fn undo_autoroute(&mut self, selection: &PinSelection) -> Result<(), AutorouterError> {
@@ -99,8 +99,8 @@ impl<M: AccessMesadata> Autorouter<M> {
         Ok(())
     }
 
-    pub fn place_via(&self, weight: ViaWeight) -> Result<PlaceViaCommandStepper, AutorouterError> {
-        PlaceViaCommandStepper::new(weight)
+    pub fn place_via(&self, weight: ViaWeight) -> Result<PlaceViaExecutionStepper, AutorouterError> {
+        PlaceViaExecutionStepper::new(weight)
     }
 
     pub fn undo_place_via(&mut self, _weight: ViaWeight) {
@@ -110,8 +110,8 @@ impl<M: AccessMesadata> Autorouter<M> {
     pub fn remove_bands(
         &self,
         selection: &BandSelection,
-    ) -> Result<RemoveBandsCommandStepper, AutorouterError> {
-        RemoveBandsCommandStepper::new(selection)
+    ) -> Result<RemoveBandsExecutionStepper, AutorouterError> {
+        RemoveBandsExecutionStepper::new(selection)
     }
 
     pub fn undo_remove_bands(&mut self, _selection: &BandSelection) {
@@ -122,7 +122,7 @@ impl<M: AccessMesadata> Autorouter<M> {
         &mut self,
         selection: &PinSelection,
         options: AutorouterOptions,
-    ) -> Result<CompareDetoursCommandStepper, AutorouterError> {
+    ) -> Result<CompareDetoursExecutionStepper, AutorouterError> {
         let ratlines = self.selected_ratlines(selection);
         let ratline1 = *ratlines
             .get(0)
@@ -138,15 +138,15 @@ impl<M: AccessMesadata> Autorouter<M> {
         ratline1: EdgeIndex<usize>,
         ratline2: EdgeIndex<usize>,
         options: AutorouterOptions,
-    ) -> Result<CompareDetoursCommandStepper, AutorouterError> {
-        CompareDetoursCommandStepper::new(self, ratline1, ratline2, options)
+    ) -> Result<CompareDetoursExecutionStepper, AutorouterError> {
+        CompareDetoursExecutionStepper::new(self, ratline1, ratline2, options)
     }
 
     pub fn measure_length(
         &mut self,
         selection: &BandSelection,
-    ) -> Result<MeasureLengthCommandStepper, AutorouterError> {
-        MeasureLengthCommandStepper::new(selection)
+    ) -> Result<MeasureLengthExecutionStepper, AutorouterError> {
+        MeasureLengthExecutionStepper::new(selection)
     }
 
     pub fn ratline_endpoints(
diff --git a/src/autorouter/command.rs b/src/autorouter/command.rs
index 8077f1d..cae54de 100644
--- a/src/autorouter/command.rs
+++ b/src/autorouter/command.rs
@@ -4,12 +4,12 @@ use serde::{Deserialize, Serialize};
 use crate::{board::mesadata::AccessMesadata, layout::via::ViaWeight, step::Step};
 
 use super::{
-    autoroute::{AutorouteCommandStepper, AutorouteStatus},
-    compare_detours::{CompareDetoursCommandStepper, CompareDetoursStatus},
+    autoroute::{AutorouteExecutionStepper, AutorouteStatus},
+    compare_detours::{CompareDetoursExecutionStepper, CompareDetoursStatus},
     invoker::{Invoker, InvokerError, InvokerStatus},
-    measure_length::MeasureLengthCommandStepper,
-    place_via::PlaceViaCommandStepper,
-    remove_bands::RemoveBandsCommandStepper,
+    measure_length::MeasureLengthExecutionStepper,
+    place_via::PlaceViaExecutionStepper,
+    remove_bands::RemoveBandsExecutionStepper,
     selection::{BandSelection, PinSelection},
     AutorouterOptions,
 };
@@ -26,21 +26,21 @@ pub enum Command {
 }
 
 #[enum_dispatch(GetMaybeNavmesh, GetMaybeTrace, GetGhosts, GetObstacles)]
-pub enum CommandStepper {
-    Autoroute(AutorouteCommandStepper),
-    PlaceVia(PlaceViaCommandStepper),
-    RemoveBands(RemoveBandsCommandStepper),
-    CompareDetours(CompareDetoursCommandStepper),
-    MeasureLength(MeasureLengthCommandStepper),
+pub enum ExecutionStepper {
+    Autoroute(AutorouteExecutionStepper),
+    PlaceVia(PlaceViaExecutionStepper),
+    RemoveBands(RemoveBandsExecutionStepper),
+    CompareDetours(CompareDetoursExecutionStepper),
+    MeasureLength(MeasureLengthExecutionStepper),
 }
 
-impl CommandStepper {
+impl ExecutionStepper {
     fn step_catch_err<M: AccessMesadata>(
         &mut self,
         invoker: &mut Invoker<M>,
     ) -> Result<InvokerStatus, InvokerError> {
         match self {
-            CommandStepper::Autoroute(autoroute) => {
+            ExecutionStepper::Autoroute(autoroute) => {
                 match autoroute.step(&mut invoker.autorouter)? {
                     AutorouteStatus::Running => Ok(InvokerStatus::Running),
                     AutorouteStatus::Routed(..) => Ok(InvokerStatus::Running),
@@ -49,19 +49,19 @@ impl CommandStepper {
                     ))),
                 }
             }
-            CommandStepper::PlaceVia(place_via) => {
+            ExecutionStepper::PlaceVia(place_via) => {
                 place_via.doit(&mut invoker.autorouter)?;
                 Ok(InvokerStatus::Finished(String::from(
                     "finished placing via",
                 )))
             }
-            CommandStepper::RemoveBands(remove_bands) => {
+            ExecutionStepper::RemoveBands(remove_bands) => {
                 remove_bands.doit(&mut invoker.autorouter)?;
                 Ok(InvokerStatus::Finished(String::from(
                     "finished removing bands",
                 )))
             }
-            CommandStepper::CompareDetours(compare_detours) => {
+            ExecutionStepper::CompareDetours(compare_detours) => {
                 match compare_detours.step(&mut invoker.autorouter)? {
                     CompareDetoursStatus::Running => Ok(InvokerStatus::Running),
                     CompareDetoursStatus::Finished(total_length1, total_length2) => {
@@ -72,7 +72,7 @@ impl CommandStepper {
                     }
                 }
             }
-            CommandStepper::MeasureLength(measure_length) => {
+            ExecutionStepper::MeasureLength(measure_length) => {
                 let length = measure_length.doit(&mut invoker.autorouter)?;
                 Ok(InvokerStatus::Finished(format!(
                     "Total length of selected bands: {}",
@@ -83,7 +83,7 @@ impl CommandStepper {
     }
 }
 
-impl<M: AccessMesadata> Step<Invoker<M>, InvokerStatus, InvokerError, ()> for CommandStepper {
+impl<M: AccessMesadata> Step<Invoker<M>, InvokerStatus, InvokerError, ()> for ExecutionStepper {
     fn step(&mut self, invoker: &mut Invoker<M>) -> Result<InvokerStatus, InvokerError> {
         match self.step_catch_err(invoker) {
             Ok(InvokerStatus::Running) => Ok(InvokerStatus::Running),
diff --git a/src/autorouter/compare_detours.rs b/src/autorouter/compare_detours.rs
index 6da6ced..1deb5c6 100644
--- a/src/autorouter/compare_detours.rs
+++ b/src/autorouter/compare_detours.rs
@@ -10,7 +10,7 @@ use crate::{
 };
 
 use super::{
-    autoroute::{AutorouteCommandStepper, AutorouteStatus},
+    autoroute::{AutorouteExecutionStepper, AutorouteStatus},
     invoker::{GetGhosts, GetMaybeNavmesh, GetMaybeTrace, GetObstacles},
     Autorouter, AutorouterError, AutorouterOptions,
 };
@@ -32,9 +32,9 @@ impl TryInto<(f64, f64)> for CompareDetoursStatus {
     }
 }
 
-pub struct CompareDetoursCommandStepper {
-    autoroute: AutorouteCommandStepper,
-    next_autoroute: Option<AutorouteCommandStepper>,
+pub struct CompareDetoursExecutionStepper {
+    autoroute: AutorouteExecutionStepper,
+    next_autoroute: Option<AutorouteExecutionStepper>,
     ratline1: EdgeIndex<usize>,
     ratline2: EdgeIndex<usize>,
     total_length1: f64,
@@ -42,7 +42,7 @@ pub struct CompareDetoursCommandStepper {
     done: bool,
 }
 
-impl CompareDetoursCommandStepper {
+impl CompareDetoursExecutionStepper {
     pub fn new(
         autorouter: &mut Autorouter<impl AccessMesadata>,
         ratline1: EdgeIndex<usize>,
@@ -64,7 +64,7 @@ impl CompareDetoursCommandStepper {
 // XXX: Do we really need this to be a stepper? We don't use at the moment, as sorting functions
 // aren't steppable either. It may be useful for debugging later on tho.
 impl<M: AccessMesadata> Step<Autorouter<M>, CompareDetoursStatus, AutorouterError, (f64, f64)>
-    for CompareDetoursCommandStepper
+    for CompareDetoursExecutionStepper
 {
     fn step(
         &mut self,
@@ -112,25 +112,25 @@ impl<M: AccessMesadata> Step<Autorouter<M>, CompareDetoursStatus, AutorouterErro
     }
 }
 
-impl GetMaybeNavmesh for CompareDetoursCommandStepper {
+impl GetMaybeNavmesh for CompareDetoursExecutionStepper {
     fn maybe_navmesh(&self) -> Option<&Navmesh> {
         self.autoroute.maybe_navmesh()
     }
 }
 
-impl GetMaybeTrace for CompareDetoursCommandStepper {
+impl GetMaybeTrace for CompareDetoursExecutionStepper {
     fn maybe_trace(&self) -> Option<&TraceStepper> {
         self.autoroute.maybe_trace()
     }
 }
 
-impl GetGhosts for CompareDetoursCommandStepper {
+impl GetGhosts for CompareDetoursExecutionStepper {
     fn ghosts(&self) -> &[PrimitiveShape] {
         self.autoroute.ghosts()
     }
 }
 
-impl GetObstacles for CompareDetoursCommandStepper {
+impl GetObstacles for CompareDetoursExecutionStepper {
     fn obstacles(&self) -> &[PrimitiveIndex] {
         self.autoroute.obstacles()
     }
diff --git a/src/autorouter/execution.rs b/src/autorouter/execution.rs
new file mode 100644
index 0000000..cae54de
--- /dev/null
+++ b/src/autorouter/execution.rs
@@ -0,0 +1,103 @@
+use enum_dispatch::enum_dispatch;
+use serde::{Deserialize, Serialize};
+
+use crate::{board::mesadata::AccessMesadata, layout::via::ViaWeight, step::Step};
+
+use super::{
+    autoroute::{AutorouteExecutionStepper, AutorouteStatus},
+    compare_detours::{CompareDetoursExecutionStepper, CompareDetoursStatus},
+    invoker::{Invoker, InvokerError, InvokerStatus},
+    measure_length::MeasureLengthExecutionStepper,
+    place_via::PlaceViaExecutionStepper,
+    remove_bands::RemoveBandsExecutionStepper,
+    selection::{BandSelection, PinSelection},
+    AutorouterOptions,
+};
+
+type Type = PinSelection;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum Command {
+    Autoroute(PinSelection, AutorouterOptions),
+    PlaceVia(ViaWeight),
+    RemoveBands(BandSelection),
+    CompareDetours(Type, AutorouterOptions),
+    MeasureLength(BandSelection),
+}
+
+#[enum_dispatch(GetMaybeNavmesh, GetMaybeTrace, GetGhosts, GetObstacles)]
+pub enum ExecutionStepper {
+    Autoroute(AutorouteExecutionStepper),
+    PlaceVia(PlaceViaExecutionStepper),
+    RemoveBands(RemoveBandsExecutionStepper),
+    CompareDetours(CompareDetoursExecutionStepper),
+    MeasureLength(MeasureLengthExecutionStepper),
+}
+
+impl ExecutionStepper {
+    fn step_catch_err<M: AccessMesadata>(
+        &mut self,
+        invoker: &mut Invoker<M>,
+    ) -> Result<InvokerStatus, InvokerError> {
+        match self {
+            ExecutionStepper::Autoroute(autoroute) => {
+                match autoroute.step(&mut invoker.autorouter)? {
+                    AutorouteStatus::Running => Ok(InvokerStatus::Running),
+                    AutorouteStatus::Routed(..) => Ok(InvokerStatus::Running),
+                    AutorouteStatus::Finished => Ok(InvokerStatus::Finished(String::from(
+                        "finished autorouting",
+                    ))),
+                }
+            }
+            ExecutionStepper::PlaceVia(place_via) => {
+                place_via.doit(&mut invoker.autorouter)?;
+                Ok(InvokerStatus::Finished(String::from(
+                    "finished placing via",
+                )))
+            }
+            ExecutionStepper::RemoveBands(remove_bands) => {
+                remove_bands.doit(&mut invoker.autorouter)?;
+                Ok(InvokerStatus::Finished(String::from(
+                    "finished removing bands",
+                )))
+            }
+            ExecutionStepper::CompareDetours(compare_detours) => {
+                match compare_detours.step(&mut invoker.autorouter)? {
+                    CompareDetoursStatus::Running => Ok(InvokerStatus::Running),
+                    CompareDetoursStatus::Finished(total_length1, total_length2) => {
+                        Ok(InvokerStatus::Finished(String::from(format!(
+                            "total detour lengths are {} and {}",
+                            total_length1, total_length2
+                        ))))
+                    }
+                }
+            }
+            ExecutionStepper::MeasureLength(measure_length) => {
+                let length = measure_length.doit(&mut invoker.autorouter)?;
+                Ok(InvokerStatus::Finished(format!(
+                    "Total length of selected bands: {}",
+                    length
+                )))
+            }
+        }
+    }
+}
+
+impl<M: AccessMesadata> Step<Invoker<M>, InvokerStatus, InvokerError, ()> for ExecutionStepper {
+    fn step(&mut self, invoker: &mut Invoker<M>) -> Result<InvokerStatus, InvokerError> {
+        match self.step_catch_err(invoker) {
+            Ok(InvokerStatus::Running) => Ok(InvokerStatus::Running),
+            Ok(InvokerStatus::Finished(msg)) => {
+                if let Some(command) = invoker.ongoing_command.take() {
+                    invoker.history.do_(command);
+                }
+
+                Ok(InvokerStatus::Finished(msg))
+            }
+            Err(err) => {
+                invoker.ongoing_command = None;
+                Err(err)
+            }
+        }
+    }
+}
diff --git a/src/autorouter/invoker.rs b/src/autorouter/invoker.rs
index 3568fb5..e623ea5 100644
--- a/src/autorouter/invoker.rs
+++ b/src/autorouter/invoker.rs
@@ -13,13 +13,13 @@ use crate::{
 };
 
 use super::{
-    autoroute::AutorouteCommandStepper,
-    command::{Command, CommandStepper},
-    compare_detours::CompareDetoursCommandStepper,
+    autoroute::AutorouteExecutionStepper,
+    command::{Command, ExecutionStepper},
+    compare_detours::CompareDetoursExecutionStepper,
     history::{History, HistoryError},
-    measure_length::MeasureLengthCommandStepper,
-    place_via::PlaceViaCommandStepper,
-    remove_bands::RemoveBandsCommandStepper,
+    measure_length::MeasureLengthExecutionStepper,
+    place_via::PlaceViaExecutionStepper,
+    remove_bands::RemoveBandsExecutionStepper,
     Autorouter, AutorouterError,
 };
 
@@ -108,14 +108,14 @@ impl<M: AccessMesadata> Invoker<M> {
     }
 
     #[debug_requires(self.ongoing_command.is_none())]
-    pub fn execute_stepper(&mut self, command: Command) -> Result<CommandStepper, InvokerError> {
+    pub fn execute_stepper(&mut self, command: Command) -> Result<ExecutionStepper, InvokerError> {
         let execute = self.dispatch_command(&command);
         self.ongoing_command = Some(command);
         execute
     }
 
     #[debug_requires(self.ongoing_command.is_none())]
-    fn dispatch_command(&mut self, command: &Command) -> Result<CommandStepper, InvokerError> {
+    fn dispatch_command(&mut self, command: &Command) -> Result<ExecutionStepper, InvokerError> {
         Ok(match command {
             Command::Autoroute(selection, options) => {
                 let mut ratlines = self.autorouter.selected_ratlines(selection);
@@ -134,19 +134,19 @@ impl<M: AccessMesadata> Invoker<M> {
                     });
                 }
 
-                CommandStepper::Autoroute(self.autorouter.autoroute_ratlines(ratlines, *options)?)
+                ExecutionStepper::Autoroute(self.autorouter.autoroute_ratlines(ratlines, *options)?)
             }
             Command::PlaceVia(weight) => {
-                CommandStepper::PlaceVia(self.autorouter.place_via(*weight)?)
+                ExecutionStepper::PlaceVia(self.autorouter.place_via(*weight)?)
             }
             Command::RemoveBands(selection) => {
-                CommandStepper::RemoveBands(self.autorouter.remove_bands(selection)?)
+                ExecutionStepper::RemoveBands(self.autorouter.remove_bands(selection)?)
             }
-            Command::CompareDetours(selection, options) => CommandStepper::CompareDetours(
+            Command::CompareDetours(selection, options) => ExecutionStepper::CompareDetours(
                 self.autorouter.compare_detours(selection, *options)?,
             ),
             Command::MeasureLength(selection) => {
-                CommandStepper::MeasureLength(self.autorouter.measure_length(selection)?)
+                ExecutionStepper::MeasureLength(self.autorouter.measure_length(selection)?)
             }
         })
     }
diff --git a/src/autorouter/measure_length.rs b/src/autorouter/measure_length.rs
index 11b0991..f38c2ac 100644
--- a/src/autorouter/measure_length.rs
+++ b/src/autorouter/measure_length.rs
@@ -12,12 +12,12 @@ use super::{
     Autorouter, AutorouterError,
 };
 
-pub struct MeasureLengthCommandStepper {
+pub struct MeasureLengthExecutionStepper {
     selection: BandSelection,
     maybe_length: Option<f64>,
 }
 
-impl MeasureLengthCommandStepper {
+impl MeasureLengthExecutionStepper {
     pub fn new(selection: &BandSelection) -> Result<Self, AutorouterError> {
         Ok(Self {
             selection: selection.clone(),
@@ -51,25 +51,25 @@ impl MeasureLengthCommandStepper {
     }
 }
 
-impl GetMaybeNavmesh for MeasureLengthCommandStepper {
+impl GetMaybeNavmesh for MeasureLengthExecutionStepper {
     fn maybe_navmesh(&self) -> Option<&Navmesh> {
         None
     }
 }
 
-impl GetMaybeTrace for MeasureLengthCommandStepper {
+impl GetMaybeTrace for MeasureLengthExecutionStepper {
     fn maybe_trace(&self) -> Option<&TraceStepper> {
         None
     }
 }
 
-impl GetGhosts for MeasureLengthCommandStepper {
+impl GetGhosts for MeasureLengthExecutionStepper {
     fn ghosts(&self) -> &[PrimitiveShape] {
         &[]
     }
 }
 
-impl GetObstacles for MeasureLengthCommandStepper {
+impl GetObstacles for MeasureLengthExecutionStepper {
     fn obstacles(&self) -> &[PrimitiveIndex] {
         &[]
     }
diff --git a/src/autorouter/place_via.rs b/src/autorouter/place_via.rs
index bacb254..b81a92d 100644
--- a/src/autorouter/place_via.rs
+++ b/src/autorouter/place_via.rs
@@ -12,12 +12,12 @@ use super::{
 };
 
 #[derive(Debug)]
-pub struct PlaceViaCommandStepper {
+pub struct PlaceViaExecutionStepper {
     weight: ViaWeight,
     done: bool,
 }
 
-impl PlaceViaCommandStepper {
+impl PlaceViaExecutionStepper {
     pub fn new(weight: ViaWeight) -> Result<Self, AutorouterError> {
         Ok(Self {
             weight,
@@ -39,25 +39,25 @@ impl PlaceViaCommandStepper {
     }
 }
 
-impl GetMaybeNavmesh for PlaceViaCommandStepper {
+impl GetMaybeNavmesh for PlaceViaExecutionStepper {
     fn maybe_navmesh(&self) -> Option<&Navmesh> {
         None
     }
 }
 
-impl GetMaybeTrace for PlaceViaCommandStepper {
+impl GetMaybeTrace for PlaceViaExecutionStepper {
     fn maybe_trace(&self) -> Option<&TraceStepper> {
         None
     }
 }
 
-impl GetGhosts for PlaceViaCommandStepper {
+impl GetGhosts for PlaceViaExecutionStepper {
     fn ghosts(&self) -> &[PrimitiveShape] {
         &[]
     }
 }
 
-impl GetObstacles for PlaceViaCommandStepper {
+impl GetObstacles for PlaceViaExecutionStepper {
     fn obstacles(&self) -> &[PrimitiveIndex] {
         &[]
     }
diff --git a/src/autorouter/remove_bands.rs b/src/autorouter/remove_bands.rs
index cea80a9..3524c53 100644
--- a/src/autorouter/remove_bands.rs
+++ b/src/autorouter/remove_bands.rs
@@ -12,12 +12,12 @@ use super::{
 };
 
 #[derive(Debug)]
-pub struct RemoveBandsCommandStepper {
+pub struct RemoveBandsExecutionStepper {
     selection: BandSelection,
     done: bool,
 }
 
-impl RemoveBandsCommandStepper {
+impl RemoveBandsExecutionStepper {
     pub fn new(selection: &BandSelection) -> Result<Self, AutorouterError> {
         Ok(Self {
             selection: selection.clone(),
@@ -47,25 +47,25 @@ impl RemoveBandsCommandStepper {
     }
 }
 
-impl GetMaybeNavmesh for RemoveBandsCommandStepper {
+impl GetMaybeNavmesh for RemoveBandsExecutionStepper {
     fn maybe_navmesh(&self) -> Option<&Navmesh> {
         None
     }
 }
 
-impl GetMaybeTrace for RemoveBandsCommandStepper {
+impl GetMaybeTrace for RemoveBandsExecutionStepper {
     fn maybe_trace(&self) -> Option<&TraceStepper> {
         None
     }
 }
 
-impl GetGhosts for RemoveBandsCommandStepper {
+impl GetGhosts for RemoveBandsExecutionStepper {
     fn ghosts(&self) -> &[PrimitiveShape] {
         &[]
     }
 }
 
-impl GetObstacles for RemoveBandsCommandStepper {
+impl GetObstacles for RemoveBandsExecutionStepper {
     fn obstacles(&self) -> &[PrimitiveIndex] {
         &[]
     }
diff --git a/src/bin/topola-egui/activity.rs b/src/bin/topola-egui/activity.rs
index 10d4a4a..a231707 100644
--- a/src/bin/topola-egui/activity.rs
+++ b/src/bin/topola-egui/activity.rs
@@ -1,7 +1,7 @@
 use thiserror::Error;
 use topola::{
     autorouter::{
-        command::CommandStepper,
+        command::ExecutionStepper,
         invoker::{
             GetGhosts, GetMaybeNavmesh, GetMaybeTrace, GetObstacles, Invoker, InvokerError,
             InvokerStatus,
@@ -15,18 +15,18 @@ use topola::{
     step::Step,
 };
 
-#[derive(Error, Debug, Clone)]
-pub enum ActivityError {
-    #[error(transparent)]
-    Invoker(#[from] InvokerError),
-}
-
 #[derive(Debug, Clone)]
 pub enum ActivityStatus {
     Running,
     Finished(String),
 }
 
+#[derive(Error, Debug, Clone)]
+pub enum ActivityError {
+    #[error(transparent)]
+    Invoker(#[from] InvokerError),
+}
+
 impl From<InvokerStatus> for ActivityStatus {
     fn from(status: InvokerStatus) -> Self {
         match status {
@@ -48,7 +48,7 @@ impl TryInto<()> for ActivityStatus {
 
 pub enum ActivityStepper {
     // There will be another variant for interactive activities here soon. (TODO)
-    Command(CommandStepper),
+    Execution(ExecutionStepper),
 }
 
 impl Step<Invoker<SpecctraMesadata>, ActivityStatus, ActivityError, ()> for ActivityStepper {
@@ -57,7 +57,7 @@ impl Step<Invoker<SpecctraMesadata>, ActivityStatus, ActivityError, ()> for Acti
         invoker: &mut Invoker<SpecctraMesadata>,
     ) -> Result<ActivityStatus, ActivityError> {
         match self {
-            ActivityStepper::Command(execute) => Ok(execute.step(invoker)?.into()),
+            ActivityStepper::Execution(execute) => Ok(execute.step(invoker)?.into()),
         }
     }
 }
@@ -66,7 +66,7 @@ impl GetMaybeNavmesh for ActivityStepper {
     /// Implemented manually instead of with `enum_dispatch` because it doesn't work across crates.
     fn maybe_navmesh(&self) -> Option<&Navmesh> {
         match self {
-            ActivityStepper::Command(execute) => execute.maybe_navmesh(),
+            ActivityStepper::Execution(execute) => execute.maybe_navmesh(),
         }
     }
 }
@@ -75,7 +75,7 @@ impl GetMaybeTrace for ActivityStepper {
     /// Implemented manually instead of with `enum_dispatch` because it doesn't work across crates.
     fn maybe_trace(&self) -> Option<&TraceStepper> {
         match self {
-            ActivityStepper::Command(execute) => execute.maybe_trace(),
+            ActivityStepper::Execution(execute) => execute.maybe_trace(),
         }
     }
 }
@@ -84,7 +84,7 @@ impl GetGhosts for ActivityStepper {
     /// Implemented manually instead of with `enum_dispatch` because it doesn't work across crates.
     fn ghosts(&self) -> &[PrimitiveShape] {
         match self {
-            ActivityStepper::Command(execute) => execute.ghosts(),
+            ActivityStepper::Execution(execute) => execute.ghosts(),
         }
     }
 }
@@ -93,7 +93,7 @@ impl GetObstacles for ActivityStepper {
     /// Implemented manually instead of with `enum_dispatch` because it doesn't work across crates.
     fn obstacles(&self) -> &[PrimitiveIndex] {
         match self {
-            ActivityStepper::Command(execute) => execute.obstacles(),
+            ActivityStepper::Execution(execute) => execute.obstacles(),
         }
     }
 }
@@ -104,9 +104,9 @@ pub struct ActivityWithStatus {
 }
 
 impl ActivityWithStatus {
-    pub fn new_execute(execute: CommandStepper) -> ActivityWithStatus {
+    pub fn new_execute(execute: ExecutionStepper) -> ActivityWithStatus {
         Self {
-            activity: ActivityStepper::Command(execute),
+            activity: ActivityStepper::Execution(execute),
             maybe_status: None,
         }
     }
diff --git a/src/bin/topola-egui/routing.rs b/src/bin/topola-egui/routing.rs
new file mode 100644
index 0000000..b0e1dcc
--- /dev/null
+++ b/src/bin/topola-egui/routing.rs
@@ -0,0 +1,4 @@
+pub struct RouteInteractionStepper {
+    route: RouteStepper,
+    options: RouterOptions,
+}