diff --git a/src/ClaudeDo.Worker/External/ConfigMcpTools.cs b/src/ClaudeDo.Worker/External/ConfigMcpTools.cs
index a6f42af..beb2fa1 100644
--- a/src/ClaudeDo.Worker/External/ConfigMcpTools.cs
+++ b/src/ClaudeDo.Worker/External/ConfigMcpTools.cs
@@ -51,7 +51,7 @@ public sealed class ConfigMcpTools
         await _broadcaster.ListUpdated(listId);
     }
 
-    [McpServerTool, Description("Set per-task config overrides (model/system prompt/agent path). Pass null to clear a field.")]
+    [McpServerTool, Description("Set per-task config overrides (model/system prompt/agent path). Pass null for any field to clear that override.")]
     public async Task SetTaskConfig(
         string taskId, string? model, string? systemPrompt, string? agentPath, CancellationToken cancellationToken)
     {