R3

codex-rs/api-client/src/prompt.rs

@@ -14,7 +14,6 @@ pub struct Prompt {
     pub output_schema: Option<Value>,
     pub reasoning: Option<Reasoning>,
     pub text_controls: Option<TextControls>,
-    pub store_response: bool,
     pub prompt_cache_key: Option<String>,
     pub previous_response_id: Option<String>,
     pub session_source: Option<SessionSource>,
@@ -30,7 +29,6 @@ impl Prompt {
         output_schema: Option<Value>,
         reasoning: Option<Reasoning>,
         text_controls: Option<TextControls>,
-        store_response: bool,
         prompt_cache_key: Option<String>,
         previous_response_id: Option<String>,
         session_source: Option<SessionSource>,
@@ -43,7 +41,6 @@ impl Prompt {
             output_schema,
             reasoning,
             text_controls,
-            store_response,
             prompt_cache_key,
             previous_response_id,
             session_source,

codex-rs/api-client/src/responses.rs

@@ -114,7 +114,7 @@ impl ResponsesApiClient {
             "tools": prompt.tools,
             "tool_choice": "auto",
             "parallel_tool_calls": prompt.parallel_tool_calls,
-            "store": azure_workaround || prompt.store_response,
+            "store": azure_workaround,
             "stream": true,
             "prompt_cache_key": prompt
                 .prompt_cache_key

codex-rs/core/src/client.rs

@@ -280,7 +280,6 @@ impl ModelClient {
             crate::client_common::compute_full_instructions(None, &self.config.model_family, false)
                 .into_owned();
         prompt.instructions = instructions;
-        prompt.store_response = false;
         prompt.previous_response_id = None;
         self.stream(&prompt).await
     }

codex-rs/core/src/codex.rs

@@ -981,14 +981,9 @@ impl Session {
 
     async fn update_responses_api_chain_state(
         &self,
-        supports_responses_api_chaining: bool,
         response_id: Option<String>,
     ) {
         let mut state = self.state.lock().await;
-        if !supports_responses_api_chaining {
-            state.reset_responses_api_chain();
-            return;
-        }
 
         let Some(response_id) = response_id.filter(|id| !id.is_empty()) else {
             state.reset_responses_api_chain();
@@ -2028,8 +2023,6 @@ async fn try_run_turn(
     prompt: Prompt,
     cancellation_token: CancellationToken,
 ) -> CodexResult<TurnRunResult> {
-    let supports_responses_api_chaining = prompt.store_response;
-
     let rollout_item = RolloutItem::TurnContext(TurnContextItem {
         cwd: turn_context.cwd.clone(),
         approval_policy: turn_context.approval_policy,
@@ -2187,7 +2180,6 @@ async fn try_run_turn(
                     tracker.get_unified_diff()
                 };
                 sess.update_responses_api_chain_state(
-                    supports_responses_api_chaining,
                     Some(response_id.clone()),
                 )
                 .await;

codex-rs/core/src/state/session.rs

@@ -8,6 +8,7 @@ use crate::codex::SessionConfiguration;
 use crate::conversation_history::ConversationHistory;
 use crate::conversation_history::ResponsesApiChainState;
 use crate::conversation_history::format_prompt_items;
+use crate::features::Feature;
 use crate::model_family::ModelFamily;
 use crate::protocol::RateLimitSnapshot;
 use crate::protocol::TokenUsage;
@@ -61,7 +62,9 @@ impl SessionState {
     }
 
     pub(crate) fn set_responses_api_chain(&mut self, chain: ResponsesApiChainState) {
-        self.history.set_responses_api_chain(chain);
+        if self.session_configuration.features.enabled(Feature::ResponsesApiChaining) {
+            self.history.set_responses_api_chain(chain);
+        }
     }
 
     // Token/rate limit helpers
@@ -142,7 +145,6 @@ pub(crate) fn build_prompt_from_items(
     chain_state: Option<&ResponsesApiChainState>,
 ) -> (Prompt, bool) {
     let mut prompt = Prompt {
-        store_response: chain_state.is_some(),
         ..Prompt::default()
     };