diff --git a/crates/tower-cmd/src/run.rs b/crates/tower-cmd/src/run.rs
index 514df320..ad7e8d1b 100644
--- a/crates/tower-cmd/src/run.rs
+++ b/crates/tower-cmd/src/run.rs
@@ -322,9 +322,12 @@ fn build_cli_execution_spec(
         parameters: params,
         env_vars,
         resources: ResourceLimits {
-            cpu_millicores: None,
-            memory_mb: None,
-            storage_mb: None,
+            cpu_limit_millicores: None,
+            cpu_request_millicores: None,
+            memory_limit_mb: None,
+            memory_request_mb: None,
+            storage_limit_mb: None,
+            storage_request_mb: None,
             max_pids: None,
             gpu_count: 0,
             timeout_seconds: 3600,
diff --git a/crates/tower-runtime/src/execution.rs b/crates/tower-runtime/src/execution.rs
index f69e51f9..387b54f9 100644
--- a/crates/tower-runtime/src/execution.rs
+++ b/crates/tower-runtime/src/execution.rs
@@ -114,17 +114,27 @@ pub enum CacheBackend {
     None,
 }
 
-/// ResourceLimits defines compute resource constraints
+/// ResourceLimits defines compute resource requests and limits.
+/// Missing values are resolved by the execution backend.
 #[derive(Debug, Clone)]
 pub struct ResourceLimits {
     /// CPU limit in millicores (e.g., 1000 = 1 CPU)
-    pub cpu_millicores: Option<u32>,
+    pub cpu_limit_millicores: Option<u32>,
+
+    /// CPU request in millicores
+    pub cpu_request_millicores: Option<u32>,
 
     /// Memory limit in megabytes
-    pub memory_mb: Option<u32>,
+    pub memory_limit_mb: Option<u32>,
+
+    /// Memory request in megabytes
+    pub memory_request_mb: Option<u32>,
 
     /// Ephemeral storage limit in megabytes
-    pub storage_mb: Option<u32>,
+    pub storage_limit_mb: Option<u32>,
+
+    /// Ephemeral storage request in megabytes
+    pub storage_request_mb: Option<u32>,
 
     /// Maximum number of processes
     pub max_pids: Option<u32>,
diff --git a/crates/tower-runtime/tests/subprocess_test.rs b/crates/tower-runtime/tests/subprocess_test.rs
index 8d7448c6..7c80cbe3 100644
--- a/crates/tower-runtime/tests/subprocess_test.rs
+++ b/crates/tower-runtime/tests/subprocess_test.rs
@@ -65,9 +65,12 @@ async fn create_execution_spec(id: String, package: Package) -> ExecutionSpec {
             command: None,
         },
         resources: ResourceLimits {
-            cpu_millicores: None,
-            memory_mb: None,
-            storage_mb: None,
+            cpu_limit_millicores: None,
+            cpu_request_millicores: None,
+            memory_limit_mb: None,
+            memory_request_mb: None,
+            storage_limit_mb: None,
+            storage_request_mb: None,
             max_pids: None,
             gpu_count: 0,
             timeout_seconds: 300,