diff --git a/codex-rs/config/src/types.rs b/codex-rs/config/src/types.rs
index 73a5763fe..15c1a6fad 100644
--- a/codex-rs/config/src/types.rs
+++ b/codex-rs/config/src/types.rs
@@ -31,6 +31,10 @@ pub const DEFAULT_MEMORIES_MAX_ROLLOUT_AGE_DAYS: i64 = 30;
 pub const DEFAULT_MEMORIES_MIN_ROLLOUT_IDLE_HOURS: i64 = 6;
 pub const DEFAULT_MEMORIES_MAX_RAW_MEMORIES_FOR_CONSOLIDATION: usize = 256;
 pub const DEFAULT_MEMORIES_MAX_UNUSED_DAYS: i64 = 30;
+const MIN_MEMORIES_MAX_RAW_MEMORIES_FOR_CONSOLIDATION: usize = 1;
+const MAX_MEMORIES_MAX_RAW_MEMORIES_FOR_CONSOLIDATION: usize = 4096;
+const MIN_MEMORIES_MAX_ROLLOUTS_PER_STARTUP: usize = 1;
+const MAX_MEMORIES_MAX_ROLLOUTS_PER_STARTUP: usize = 128;
 
 const fn default_enabled() -> bool {
     true
@@ -185,12 +189,14 @@ pub struct MemoriesToml {
     /// When `false`, skip injecting memory usage instructions into developer prompts.
     pub use_memories: Option<bool>,
     /// Maximum number of recent raw memories retained for global consolidation.
+    #[schemars(range(min = 1, max = 4096))]
     pub max_raw_memories_for_consolidation: Option<usize>,
     /// Maximum number of days since a memory was last used before it becomes ineligible for phase 2 selection.
     pub max_unused_days: Option<i64>,
     /// Maximum age of the threads used for memories.
     pub max_rollout_age_days: Option<i64>,
     /// Maximum number of rollout candidates processed per pass.
+    #[schemars(range(min = 1, max = 128))]
     pub max_rollouts_per_startup: Option<usize>,
     /// Minimum idle time between last thread activity and memory creation (hours). > 12h recommended.
     pub min_rollout_idle_hours: Option<i64>,
@@ -244,7 +250,10 @@ impl From<MemoriesToml> for MemoriesConfig {
             max_raw_memories_for_consolidation: toml
                 .max_raw_memories_for_consolidation
                 .unwrap_or(defaults.max_raw_memories_for_consolidation)
-                .min(4096),
+                .clamp(
+                    MIN_MEMORIES_MAX_RAW_MEMORIES_FOR_CONSOLIDATION,
+                    MAX_MEMORIES_MAX_RAW_MEMORIES_FOR_CONSOLIDATION,
+                ),
             max_unused_days: toml
                 .max_unused_days
                 .unwrap_or(defaults.max_unused_days)
@@ -256,7 +265,10 @@ impl From<MemoriesToml> for MemoriesConfig {
             max_rollouts_per_startup: toml
                 .max_rollouts_per_startup
                 .unwrap_or(defaults.max_rollouts_per_startup)
-                .min(128),
+                .clamp(
+                    MIN_MEMORIES_MAX_ROLLOUTS_PER_STARTUP,
+                    MAX_MEMORIES_MAX_ROLLOUTS_PER_STARTUP,
+                ),
             min_rollout_idle_hours: toml
                 .min_rollout_idle_hours
                 .unwrap_or(defaults.min_rollout_idle_hours)
diff --git a/codex-rs/config/src/types_tests.rs b/codex-rs/config/src/types_tests.rs
index fbcd2bdc6..b18c1cc64 100644
--- a/codex-rs/config/src/types_tests.rs
+++ b/codex-rs/config/src/types_tests.rs
@@ -41,3 +41,21 @@ fn deserialize_skill_config_with_path_selector() {
         }
     );
 }
+
+#[test]
+fn memories_config_clamps_count_limits_to_nonzero_values() {
+    let config = MemoriesConfig::from(MemoriesToml {
+        max_raw_memories_for_consolidation: Some(0),
+        max_rollouts_per_startup: Some(0),
+        ..Default::default()
+    });
+
+    assert_eq!(
+        config,
+        MemoriesConfig {
+            max_raw_memories_for_consolidation: 1,
+            max_rollouts_per_startup: 1,
+            ..MemoriesConfig::default()
+        }
+    );
+}
diff --git a/codex-rs/core/config.schema.json b/codex-rs/core/config.schema.json
index c61daa8b5..39c50bcd0 100644
--- a/codex-rs/core/config.schema.json
+++ b/codex-rs/core/config.schema.json
@@ -855,7 +855,8 @@
         "max_raw_memories_for_consolidation": {
           "description": "Maximum number of recent raw memories retained for global consolidation.",
           "format": "uint",
-          "minimum": 0.0,
+          "maximum": 4096.0,
+          "minimum": 1.0,
           "type": "integer"
         },
         "max_rollout_age_days": {
@@ -866,7 +867,8 @@
         "max_rollouts_per_startup": {
           "description": "Maximum number of rollout candidates processed per pass.",
           "format": "uint",
-          "minimum": 0.0,
+          "maximum": 128.0,
+          "minimum": 1.0,
           "type": "integer"
         },
         "max_unused_days": {