diff --git a/codex-rs/code-mode-host/src/grpc/conversions.rs b/codex-rs/code-mode-host/src/grpc/conversions.rs
index 7c6f6134bd..2f4f8b5f0c 100644
--- a/codex-rs/code-mode-host/src/grpc/conversions.rs
+++ b/codex-rs/code-mode-host/src/grpc/conversions.rs
@@ -54,11 +54,6 @@ pub(super) fn execute_request(request: proto::ExecuteRequest) -> Result<ExecuteR
 
 fn tool_definition(definition: proto::ToolDefinition) -> Result<ToolDefinition, Status> {
     validation::identifier(&definition.name, "tool definition name")?;
-    validation::bounded(
-        &definition.description,
-        validation::MAX_TOOL_DESCRIPTION_BYTES,
-        "tool description",
-    )?;
     let name = definition
         .tool_name
         .ok_or_else(|| Status::invalid_argument("tool definition is missing its tool name"))?;
diff --git a/codex-rs/code-mode-host/src/grpc/robustness_tests.rs b/codex-rs/code-mode-host/src/grpc/robustness_tests.rs
index eb9b21b086..31c5eb1095 100644
--- a/codex-rs/code-mode-host/src/grpc/robustness_tests.rs
+++ b/codex-rs/code-mode-host/src/grpc/robustness_tests.rs
@@ -25,7 +25,6 @@ use super::tests::execute_request;
 use super::tests::open_session;
 use super::tests::tool;
 use super::validation::MAX_IDENTIFIER_BYTES;
-use super::validation::MAX_TOOL_DESCRIPTION_BYTES;
 use super::validation::MAX_TOOL_FILTERS;
 use crate::MAX_ACTIVE_CELLS;
 use crate::MAX_IN_FLIGHT_REQUESTS;
@@ -49,7 +48,7 @@ fn invocation(cell_id: &str, name: &str) -> CodeModeNestedToolCall {
 }
 
 #[tokio::test]
-async fn rejects_oversized_identifiers_tool_metadata_and_subscription_filters() {
+async fn rejects_oversized_identifiers_and_subscription_filters() {
     let host = GrpcCodeModeHost::new();
     let (session_id, _events) = open_session(&host).await;
     let oversized_id = "x".repeat(MAX_IDENTIFIER_BYTES + 1);
@@ -117,12 +116,6 @@ async fn rejects_oversized_identifiers_tool_metadata_and_subscription_filters()
         .await,
     );
 
-    let mut request = execute_request(&session_id, "metadata", "text(\"hello\");");
-    request.enabled_tools = vec![proto::ToolDefinition {
-        description: "x".repeat(MAX_TOOL_DESCRIPTION_BYTES + 1),
-        ..tool("echo")
-    }];
-    assert_invalid(host.execute(Request::new(request)).await);
     assert!(host.state.session(&session_id).is_ok());
 }
 
diff --git a/codex-rs/code-mode-host/src/grpc/validation.rs b/codex-rs/code-mode-host/src/grpc/validation.rs
index dc3fd4a879..7326665897 100644
--- a/codex-rs/code-mode-host/src/grpc/validation.rs
+++ b/codex-rs/code-mode-host/src/grpc/validation.rs
@@ -6,7 +6,6 @@ pub(super) use codex_code_mode_protocol::grpc::MAX_IDENTIFIER_BYTES;
 pub(super) use codex_code_mode_protocol::grpc::MAX_TOOL_ERROR_BYTES;
 pub(super) const MAX_TOOL_FILTERS: usize = 64;
 pub(super) const MAX_TOOL_DEFINITIONS: usize = 1_024;
-pub(super) const MAX_TOOL_DESCRIPTION_BYTES: usize = 16 * 1_024;
 
 pub(super) fn identifier(value: &str, field: &str) -> Result<(), Status> {
     if value.is_empty() {