diff --git a/testing-framework/core/src/scenario/definition.rs b/testing-framework/core/src/scenario/definition.rs
index e8b3a4e..44b210c 100644
--- a/testing-framework/core/src/scenario/definition.rs
+++ b/testing-framework/core/src/scenario/definition.rs
@@ -11,7 +11,7 @@ use super::{
     expectation::Expectation,
     runtime::{
         context::RunMetrics,
-        orchestration::{SourceModeName, SourceOrchestrationPlan, SourceOrchestrationPlanError},
+        orchestration::{SourceOrchestrationPlan, SourceOrchestrationPlanError},
     },
     workload::Workload,
 };
@@ -724,19 +724,11 @@ fn build_source_orchestration_plan(
 fn source_plan_error_to_build_error(error: SourceOrchestrationPlanError) -> ScenarioBuildError {
     match error {
         SourceOrchestrationPlanError::SourceModeNotWiredYet { mode } => {
-            ScenarioBuildError::SourceModeNotWiredYet {
-                mode: source_mode_name(mode),
-            }
+            ScenarioBuildError::SourceModeNotWiredYet { mode }
         }
     }
 }
 
-const fn source_mode_name(mode: SourceModeName) -> &'static str {
-    match mode {
-        SourceModeName::Attached => "Attached",
-    }
-}
-
 impl<E: Application> Builder<E, ()> {
     #[must_use]
     pub fn enable_node_control(self) -> Builder<E, NodeControlCapability> {
diff --git a/testing-framework/core/src/scenario/runtime/orchestration/mod.rs b/testing-framework/core/src/scenario/runtime/orchestration/mod.rs
index 9e71458..a17ce28 100644
--- a/testing-framework/core/src/scenario/runtime/orchestration/mod.rs
+++ b/testing-framework/core/src/scenario/runtime/orchestration/mod.rs
@@ -3,9 +3,9 @@ mod source_orchestration_plan;
 #[allow(dead_code)]
 mod source_resolver;
 
+pub(crate) use source_orchestration_plan::SourceOrchestrationMode;
 pub use source_orchestration_plan::{
-    ManagedSource, SourceModeName, SourceOrchestrationMode, SourceOrchestrationPlan,
-    SourceOrchestrationPlanError,
+    ManagedSource, SourceOrchestrationPlan, SourceOrchestrationPlanError,
 };
 pub use source_resolver::{
     build_source_orchestration_plan, orchestrate_sources, orchestrate_sources_with_providers,
diff --git a/testing-framework/core/src/scenario/runtime/orchestration/source_orchestration_plan.rs b/testing-framework/core/src/scenario/runtime/orchestration/source_orchestration_plan.rs
index dd57ee9..ed72ae3 100644
--- a/testing-framework/core/src/scenario/runtime/orchestration/source_orchestration_plan.rs
+++ b/testing-framework/core/src/scenario/runtime/orchestration/source_orchestration_plan.rs
@@ -1,5 +1,3 @@
-use std::fmt;
-
 use crate::scenario::{AttachSource, ExternalNodeSource, ScenarioSources, SourceReadinessPolicy};
 
 /// Explicit descriptor for managed node sourcing.
@@ -15,7 +13,7 @@ pub enum ManagedSource {
 /// This is scaffolding-only and is intentionally not executed by deployers
 /// yet.
 #[derive(Clone, Debug, Eq, PartialEq)]
-pub enum SourceOrchestrationMode {
+pub(crate) enum SourceOrchestrationMode {
     Managed {
         managed: ManagedSource,
         external: Vec<ExternalNodeSource>,
@@ -34,28 +32,15 @@ pub enum SourceOrchestrationMode {
 /// This captures only mapping-time source intent and readiness policy.
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct SourceOrchestrationPlan {
-    pub mode: SourceOrchestrationMode,
-    pub readiness_policy: SourceReadinessPolicy,
-}
-
-#[derive(Clone, Copy, Debug, Eq, PartialEq)]
-pub enum SourceModeName {
-    Attached,
-}
-
-impl fmt::Display for SourceModeName {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Attached => f.write_str("Attached"),
-        }
-    }
+    mode: SourceOrchestrationMode,
+    readiness_policy: SourceReadinessPolicy,
 }
 
 /// Validation failure while building orchestration plan from sources.
 #[derive(Debug, thiserror::Error)]
 pub enum SourceOrchestrationPlanError {
     #[error("source mode '{mode}' is not wired into deployers yet")]
-    SourceModeNotWiredYet { mode: SourceModeName },
+    SourceModeNotWiredYet { mode: &'static str },
 }
 
 impl SourceOrchestrationPlan {
@@ -71,6 +56,11 @@ impl SourceOrchestrationPlan {
         })
     }
 
+    #[must_use]
+    pub(crate) fn mode(&self) -> &SourceOrchestrationMode {
+        &self.mode
+    }
+
     #[must_use]
     pub fn external_sources(&self) -> &[ExternalNodeSource] {
         match &self.mode {
@@ -94,7 +84,7 @@ mod tests {
                 .expect("attached sources should build a source orchestration plan");
 
         assert!(matches!(
-            plan.mode,
+            plan.mode(),
             SourceOrchestrationMode::Attached { .. }
         ));
     }
diff --git a/testing-framework/core/src/scenario/runtime/orchestration/source_resolver.rs b/testing-framework/core/src/scenario/runtime/orchestration/source_resolver.rs
index 6ebd646..8ead379 100644
--- a/testing-framework/core/src/scenario/runtime/orchestration/source_resolver.rs
+++ b/testing-framework/core/src/scenario/runtime/orchestration/source_resolver.rs
@@ -52,7 +52,7 @@ pub async fn resolve_sources<E: Application>(
     plan: &SourceOrchestrationPlan,
     providers: &SourceProviders<E>,
 ) -> Result<ResolvedSources<E>, SourceResolveError> {
-    match &plan.mode {
+    match plan.mode() {
         SourceOrchestrationMode::Managed { managed, .. } => {
             let managed_nodes = providers.managed.provide(managed).await?;
             let external_nodes = providers.external.provide(plan.external_sources()).await?;
@@ -115,7 +115,8 @@ pub async fn orchestrate_sources_with_providers<E: Application>(
 ) -> Result<NodeClients<E>, DynError> {
     let resolved = resolve_sources(plan, &providers).await?;
 
-    if matches!(plan.mode, SourceOrchestrationMode::Managed { .. }) && resolved.managed.is_empty() {
+    if matches!(plan.mode(), SourceOrchestrationMode::Managed { .. }) && resolved.managed.is_empty()
+    {
         return Err(SourceResolveError::ManagedNodesMissing.into());
     }