diff --git a/codex-rs/app-server/src/bespoke_event_handling.rs b/codex-rs/app-server/src/bespoke_event_handling.rs
index a06a2cd073..55b185e5a8 100644
--- a/codex-rs/app-server/src/bespoke_event_handling.rs
+++ b/codex-rs/app-server/src/bespoke_event_handling.rs
@@ -294,25 +294,17 @@ pub(crate) async fn apply_bespoke_event_handling(
                         }),
                     })
                     .collect();
-                let call_id = request.call_id.clone();
                 let params = ToolRequestUserInputParams {
                     thread_id: conversation_id.to_string(),
                     turn_id: request.turn_id,
-                    item_id: call_id.clone(),
+                    item_id: request.call_id,
                     questions,
                 };
                 let rx = outgoing
                     .send_request(ServerRequestPayload::ToolRequestUserInput(params))
                     .await;
-                let response_call_id = call_id.clone();
                 tokio::spawn(async move {
-                    on_request_user_input_response(
-                        event_turn_id,
-                        response_call_id,
-                        rx,
-                        conversation,
-                    )
-                    .await;
+                    on_request_user_input_response(event_turn_id, rx, conversation).await;
                 });
             } else {
                 error!(
@@ -325,7 +317,6 @@ pub(crate) async fn apply_bespoke_event_handling(
                 if let Err(err) = conversation
                     .submit(Op::UserInputAnswer {
                         id: event_turn_id,
-                        call_id: Some(request.call_id.clone()),
                         response: empty,
                     })
                     .await
@@ -1492,7 +1483,6 @@ async fn on_exec_approval_response(
 
 async fn on_request_user_input_response(
     event_turn_id: String,
-    call_id: String,
     receiver: oneshot::Receiver<JsonValue>,
     conversation: Arc<CodexThread>,
 ) {
@@ -1507,7 +1497,6 @@ async fn on_request_user_input_response(
             if let Err(err) = conversation
                 .submit(Op::UserInputAnswer {
                     id: event_turn_id,
-                    call_id: Some(call_id.clone()),
                     response: empty,
                 })
                 .await
@@ -1543,7 +1532,6 @@ async fn on_request_user_input_response(
     if let Err(err) = conversation
         .submit(Op::UserInputAnswer {
             id: event_turn_id,
-            call_id: Some(call_id),
             response,
         })
         .await
diff --git a/codex-rs/core/src/codex.rs b/codex-rs/core/src/codex.rs
index 03fdd15704..e71fb7cd1c 100644
--- a/codex-rs/core/src/codex.rs
+++ b/codex-rs/core/src/codex.rs
@@ -33,7 +33,6 @@ use crate::stream_events_utils::HandleOutputCtx;
 use crate::stream_events_utils::handle_non_tool_response_item;
 use crate::stream_events_utils::handle_output_item_done;
 use crate::stream_events_utils::last_assistant_message_from_item;
-use crate::stream_events_utils::response_input_to_response_item;
 use crate::terminal;
 use crate::transport_manager::TransportManager;
 use crate::truncate::TruncationPolicy;
@@ -212,7 +211,6 @@ use codex_protocol::config_types::ReasoningSummary as ReasoningSummaryConfig;
 use codex_protocol::config_types::WindowsSandboxLevel;
 use codex_protocol::models::ContentItem;
 use codex_protocol::models::DeveloperInstructions;
-use codex_protocol::models::FunctionCallOutputPayload;
 use codex_protocol::models::ResponseInputItem;
 use codex_protocol::models::ResponseItem;
 use codex_protocol::protocol::CodexErrorInfo;
@@ -1719,7 +1717,6 @@ impl Session {
     pub async fn notify_user_input_response(
         &self,
         sub_id: &str,
-        call_id: Option<String>,
         response: RequestUserInputResponse,
     ) {
         let entry = {
@@ -1738,36 +1735,6 @@ impl Session {
             }
             None => {
                 warn!("No pending user input found for sub_id: {sub_id}");
-                if response.answers.is_empty() {
-                    warn!(
-                        "dropping empty request_user_input response for sub_id: {sub_id}; likely cancelled"
-                    );
-                    return;
-                }
-                let call_id = call_id.unwrap_or_else(|| sub_id.to_string());
-                let content = match response.to_tool_output_content() {
-                    Ok(content) => content,
-                    Err(err) => {
-                        warn!(
-                            "failed to serialize request_user_input response for call_id: {call_id}: {err}"
-                        );
-                        return;
-                    }
-                };
-                let response_input = ResponseInputItem::FunctionCallOutput {
-                    call_id: call_id.clone(),
-                    output: FunctionCallOutputPayload {
-                        content,
-                        success: Some(true),
-                        ..Default::default()
-                    },
-                };
-                let Some(response_item) = response_input_to_response_item(&response_input) else {
-                    return;
-                };
-                let turn_context = self.new_default_turn_with_sub_id(sub_id.to_string()).await;
-                self.record_conversation_items(&turn_context, &[response_item])
-                    .await;
             }
         }
     }
@@ -2592,12 +2559,8 @@ async fn submission_loop(sess: Arc<Session>, config: Arc<Config>, rx_sub: Receiv
             Op::PatchApproval { id, decision } => {
                 handlers::patch_approval(&sess, id, decision).await;
             }
-            Op::UserInputAnswer {
-                id,
-                call_id,
-                response,
-            } => {
-                handlers::request_user_input_response(&sess, id, call_id, response).await;
+            Op::UserInputAnswer { id, response } => {
+                handlers::request_user_input_response(&sess, id, response).await;
             }
             Op::DynamicToolResponse { id, response } => {
                 handlers::dynamic_tool_response(&sess, id, response).await;
@@ -2951,11 +2914,9 @@ mod handlers {
     pub async fn request_user_input_response(
         sess: &Arc<Session>,
         id: String,
-        call_id: Option<String>,
         response: RequestUserInputResponse,
     ) {
-        sess.notify_user_input_response(&id, call_id, response)
-            .await;
+        sess.notify_user_input_response(&id, response).await;
     }
 
     pub async fn dynamic_tool_response(
diff --git a/codex-rs/core/src/codex_delegate.rs b/codex-rs/core/src/codex_delegate.rs
index 1f61ef711d..7a611c05e2 100644
--- a/codex-rs/core/src/codex_delegate.rs
+++ b/codex-rs/core/src/codex_delegate.rs
@@ -380,13 +380,7 @@ async fn handle_request_user_input(
         cancel_token,
     )
     .await;
-    let _ = codex
-        .submit(Op::UserInputAnswer {
-            id,
-            call_id: Some(event.call_id.clone()),
-            response,
-        })
-        .await;
+    let _ = codex.submit(Op::UserInputAnswer { id, response }).await;
 }
 
 async fn await_user_input_with_cancel<F>(
@@ -405,7 +399,7 @@ where
                 answers: HashMap::new(),
             };
             parent_session
-                .notify_user_input_response(sub_id, None, empty.clone())
+                .notify_user_input_response(sub_id, empty.clone())
                 .await;
             empty
         }
diff --git a/codex-rs/core/src/mcp/skill_dependencies.rs b/codex-rs/core/src/mcp/skill_dependencies.rs
index 8fdc413312..8836e29c1f 100644
--- a/codex-rs/core/src/mcp/skill_dependencies.rs
+++ b/codex-rs/core/src/mcp/skill_dependencies.rs
@@ -106,7 +106,7 @@ async fn should_install_mcp_dependencies(
             let empty = RequestUserInputResponse {
                 answers: HashMap::new(),
             };
-            sess.notify_user_input_response(sub_id, None, empty.clone())
+            sess.notify_user_input_response(sub_id, empty.clone())
                 .await;
             empty
         }
diff --git a/codex-rs/core/tests/suite/request_user_input.rs b/codex-rs/core/tests/suite/request_user_input.rs
index 4ba7502948..89a5ed3557 100644
--- a/codex-rs/core/tests/suite/request_user_input.rs
+++ b/codex-rs/core/tests/suite/request_user_input.rs
@@ -165,7 +165,6 @@ async fn request_user_input_round_trip_resolves_pending() -> anyhow::Result<()>
     codex
         .submit(Op::UserInputAnswer {
             id: request.turn_id.clone(),
-            call_id: Some(request.call_id.clone()),
             response,
         })
         .await?;
diff --git a/codex-rs/docs/protocol_v1.md b/codex-rs/docs/protocol_v1.md
index 803119604e..8f68ecc9a6 100644
--- a/codex-rs/docs/protocol_v1.md
+++ b/codex-rs/docs/protocol_v1.md
@@ -69,7 +69,7 @@ For complete documentation of the `Op` and `EventMsg` variants, refer to [protoc
   - `Op::UserInput` – Legacy form of user input
   - `Op::Interrupt` – Interrupts a running turn
   - `Op::ExecApproval` – Approve or deny code execution
-  - `Op::UserInputAnswer` – Provide answers for a `request_user_input` tool call (optionally include `call_id`)
+  - `Op::UserInputAnswer` – Provide answers for a `request_user_input` tool call
   - `Op::ListSkills` – Request skills for one or more cwd values (optionally `force_reload`)
   - `Op::UserTurn` and `Op::OverrideTurnContext` accept an optional `personality` override that updates the model’s communication style
 - `EventMsg`
diff --git a/codex-rs/protocol/src/protocol.rs b/codex-rs/protocol/src/protocol.rs
index a7b72b21a3..bf193cca9c 100644
--- a/codex-rs/protocol/src/protocol.rs
+++ b/codex-rs/protocol/src/protocol.rs
@@ -222,9 +222,6 @@ pub enum Op {
     UserInputAnswer {
         /// Turn id for the in-flight request.
         id: String,
-        /// Tool call id for the in-flight request, if available.
-        #[serde(skip_serializing_if = "Option::is_none")]
-        call_id: Option<String>,
         /// User-provided answers.
         response: RequestUserInputResponse,
     },
diff --git a/codex-rs/protocol/src/request_user_input.rs b/codex-rs/protocol/src/request_user_input.rs
index fa5d20b1ab..cb076264dd 100644
--- a/codex-rs/protocol/src/request_user_input.rs
+++ b/codex-rs/protocol/src/request_user_input.rs
@@ -43,12 +43,6 @@ pub struct RequestUserInputResponse {
     pub answers: HashMap<String, RequestUserInputAnswer>,
 }
 
-impl RequestUserInputResponse {
-    pub fn to_tool_output_content(&self) -> Result<String, serde_json::Error> {
-        serde_json::to_string(self)
-    }
-}
-
 #[derive(Debug, Clone, Deserialize, Serialize, PartialEq, Eq, JsonSchema, TS)]
 pub struct RequestUserInputEvent {
     /// Responses API call id for the associated tool call, if available.
diff --git a/codex-rs/tui/src/bottom_pane/request_user_input/mod.rs b/codex-rs/tui/src/bottom_pane/request_user_input/mod.rs
index 59807a8a4c..a9e00a6bd1 100644
--- a/codex-rs/tui/src/bottom_pane/request_user_input/mod.rs
+++ b/codex-rs/tui/src/bottom_pane/request_user_input/mod.rs
@@ -1459,7 +1459,7 @@ mod tests {
         overlay.submit_answers();
 
         let event = rx.try_recv().expect("expected AppEvent");
-        let AppEvent::CodexOp(Op::UserInputAnswer { id, response, .. }) = event else {
+        let AppEvent::CodexOp(Op::UserInputAnswer { id, response }) = event else {
             panic!("expected UserInputAnswer");
         };
         assert_eq!(id, "turn-1");