diff --git a/packages/contracts/src/settings.ts b/packages/contracts/src/settings.ts
index 9cd8a5f251..51fe683f99 100644
--- a/packages/contracts/src/settings.ts
+++ b/packages/contracts/src/settings.ts
@@ -112,6 +112,7 @@ const ClaudeModelOptionsPatch = Schema.Struct({
   thinking: Schema.optionalKey(ClaudeModelOptions.fields.thinking),
   effort: Schema.optionalKey(ClaudeModelOptions.fields.effort),
   fastMode: Schema.optionalKey(ClaudeModelOptions.fields.fastMode),
+  contextWindow: Schema.optionalKey(ClaudeModelOptions.fields.contextWindow),
 });
 
 const ModelSelectionPatch = Schema.Union([