chore: nuke chat/completions API

codex-rs/codex-api/README.md

@@ -2,7 +2,7 @@
 
 Typed clients for Codex/OpenAI APIs built on top of the generic transport in `codex-client`.
 
-- Hosts the request/response models and prompt helpers for Responses, Chat Completions, and Compact APIs.
+- Hosts the request/response models and prompt helpers for Responses and Compact APIs.
 - Owns provider configuration (base URLs, headers, query params), auth header injection, retry tuning, and stream idle settings.
 - Parses SSE streams into `ResponseEvent`/`ResponseStream`, including rate-limit snapshots and API-specific error mapping.
 - Serves as the wire-level layer consumed by `codex-core`; higher layers handle auth refresh and business logic.
@@ -11,7 +11,7 @@ Typed clients for Codex/OpenAI APIs built on top of the generic transport in `co
 
 The public interface of this crate is intentionally small and uniform:
 
-- **Prompted endpoints (Chat + Responses)**
+- **Prompted endpoints (Responses)**
   - Input: a single `Prompt` plus endpoint-specific options.
     - `Prompt` (re-exported as `codex_api::Prompt`) carries:
       - `instructions: String` – the fully-resolved system prompt for this turn.

codex-rs/codex-api/src/common.rs

@@ -13,7 +13,7 @@ use std::task::Context;
 use std::task::Poll;
 use tokio::sync::mpsc;
 
-/// Canonical prompt input for Chat and Responses endpoints.
+/// Canonical prompt input for Responses endpoints.
 #[derive(Debug, Clone)]
 pub struct Prompt {
     /// Fully-resolved system instructions for this turn.

codex-rs/codex-api/src/endpoint/chat.rs → codex-rs/codex-api/src/endpoint/aggregate.rs

@@ -1,111 +1,21 @@
-use crate::ChatRequest;
-use crate::auth::AuthProvider;
-use crate::common::Prompt as ApiPrompt;
 use crate::common::ResponseEvent;
 use crate::common::ResponseStream;
-use crate::endpoint::streaming::StreamingClient;
 use crate::error::ApiError;
-use crate::provider::Provider;
-use crate::provider::WireApi;
-use crate::sse::chat::spawn_chat_stream;
-use crate::telemetry::SseTelemetry;
-use codex_client::HttpTransport;
-use codex_client::RequestCompression;
-use codex_client::RequestTelemetry;
 use codex_protocol::models::ContentItem;
 use codex_protocol::models::ReasoningItemContent;
 use codex_protocol::models::ResponseItem;
-use codex_protocol::protocol::SessionSource;
 use futures::Stream;
-use http::HeaderMap;
-use serde_json::Value;
 use std::collections::VecDeque;
 use std::pin::Pin;
-use std::sync::Arc;
 use std::task::Context;
 use std::task::Poll;
 
-pub struct ChatClient<T: HttpTransport, A: AuthProvider> {
-    streaming: StreamingClient<T, A>,
-}
-
-impl<T: HttpTransport, A: AuthProvider> ChatClient<T, A> {
-    pub fn new(transport: T, provider: Provider, auth: A) -> Self {
-        Self {
-            streaming: StreamingClient::new(transport, provider, auth),
-        }
-    }
-
-    pub fn with_telemetry(
-        self,
-        request: Option<Arc<dyn RequestTelemetry>>,
-        sse: Option<Arc<dyn SseTelemetry>>,
-    ) -> Self {
-        Self {
-            streaming: self.streaming.with_telemetry(request, sse),
-        }
-    }
-
-    pub async fn stream_request(&self, request: ChatRequest) -> Result<ResponseStream, ApiError> {
-        self.stream(request.body, request.headers).await
-    }
-
-    pub async fn stream_prompt(
-        &self,
-        model: &str,
-        prompt: &ApiPrompt,
-        conversation_id: Option<String>,
-        session_source: Option<SessionSource>,
-    ) -> Result<ResponseStream, ApiError> {
-        use crate::requests::ChatRequestBuilder;
-
-        let request =
-            ChatRequestBuilder::new(model, &prompt.instructions, &prompt.input, &prompt.tools)
-                .conversation_id(conversation_id)
-                .session_source(session_source)
-                .build(self.streaming.provider())?;
-
-        self.stream_request(request).await
-    }
-
-    fn path(&self) -> &'static str {
-        match self.streaming.provider().wire {
-            WireApi::Chat => "chat/completions",
-            _ => "responses",
-        }
-    }
-
-    pub async fn stream(
-        &self,
-        body: Value,
-        extra_headers: HeaderMap,
-    ) -> Result<ResponseStream, ApiError> {
-        self.streaming
-            .stream(
-                self.path(),
-                body,
-                extra_headers,
-                RequestCompression::None,
-                spawn_chat_stream,
-                None,
-            )
-            .await
-    }
-}
-
-#[derive(Copy, Clone, Eq, PartialEq)]
-pub enum AggregateMode {
-    AggregatedOnly,
-    Streaming,
-}
-
 /// Stream adapter that merges token deltas into a single assistant message per turn.
 pub struct AggregatedStream {
     inner: ResponseStream,
     cumulative: String,
     cumulative_reasoning: String,
     pending: VecDeque<ResponseEvent>,
-    mode: AggregateMode,
 }
 
 impl Stream for AggregatedStream {
@@ -122,37 +32,24 @@ impl Stream for AggregatedStream {
             match Pin::new(&mut this.inner).poll_next(cx) {
                 Poll::Pending => return Poll::Pending,
                 Poll::Ready(None) => return Poll::Ready(None),
-                Poll::Ready(Some(Err(e))) => return Poll::Ready(Some(Err(e))),
+                Poll::Ready(Some(Err(err))) => return Poll::Ready(Some(Err(err))),
                 Poll::Ready(Some(Ok(ResponseEvent::OutputItemDone(item)))) => {
                     let is_assistant_message = matches!(
                         &item,
                         ResponseItem::Message { role, .. } if role == "assistant"
                     );
 
                     if is_assistant_message {
-                        match this.mode {
-                            AggregateMode::AggregatedOnly => {
-                                if this.cumulative.is_empty()
-                                    && let ResponseItem::Message { content, .. } = &item
-                                    && let Some(text) = content.iter().find_map(|c| match c {
-                                        ContentItem::OutputText { text } => Some(text),
-                                        _ => None,
-                                    })
-                                {
-                                    this.cumulative.push_str(text);
-                                }
-                                continue;
-                            }
-                            AggregateMode::Streaming => {
-                                if this.cumulative.is_empty() {
-                                    return Poll::Ready(Some(Ok(ResponseEvent::OutputItemDone(
-                                        item,
-                                    ))));
-                                } else {
-                                    continue;
-                                }
-                            }
+                        if this.cumulative.is_empty()
+                            && let ResponseItem::Message { content, .. } = &item
+                            && let Some(text) = content.iter().find_map(|c| match c {
+                                ContentItem::OutputText { text } => Some(text),
+                                _ => None,
+                            })
+                        {
+                            this.cumulative.push_str(text);
                         }
+                        continue;
                     }
 
                     return Poll::Ready(Some(Ok(ResponseEvent::OutputItemDone(item))));
@@ -215,35 +112,20 @@ impl Stream for AggregatedStream {
                         token_usage,
                     })));
                 }
-                Poll::Ready(Some(Ok(ResponseEvent::Created))) => {
-                    continue;
-                }
+                Poll::Ready(Some(Ok(ResponseEvent::Created))) => continue,
                 Poll::Ready(Some(Ok(ResponseEvent::OutputTextDelta(delta)))) => {
                     this.cumulative.push_str(&delta);
-                    if matches!(this.mode, AggregateMode::Streaming) {
-                        return Poll::Ready(Some(Ok(ResponseEvent::OutputTextDelta(delta))));
-                    } else {
-                        continue;
-                    }
+                    continue;
                 }
                 Poll::Ready(Some(Ok(ResponseEvent::ReasoningContentDelta {
                     delta,
-                    content_index,
+                    content_index: _,
                 }))) => {
                     this.cumulative_reasoning.push_str(&delta);
-                    if matches!(this.mode, AggregateMode::Streaming) {
-                        return Poll::Ready(Some(Ok(ResponseEvent::ReasoningContentDelta {
-                            delta,
-                            content_index,
-                        })));
-                    } else {
-                        continue;
-                    }
-                }
-                Poll::Ready(Some(Ok(ResponseEvent::ReasoningSummaryDelta { .. }))) => continue,
-                Poll::Ready(Some(Ok(ResponseEvent::ReasoningSummaryPartAdded { .. }))) => {
                     continue;
                 }
+                Poll::Ready(Some(Ok(ResponseEvent::ReasoningSummaryDelta { .. }))) => continue,
+                Poll::Ready(Some(Ok(ResponseEvent::ReasoningSummaryPartAdded { .. }))) => continue,
                 Poll::Ready(Some(Ok(ResponseEvent::OutputItemAdded(item)))) => {
                     return Poll::Ready(Some(Ok(ResponseEvent::OutputItemAdded(item))));
                 }
@@ -254,28 +136,21 @@ impl Stream for AggregatedStream {
 
 pub trait AggregateStreamExt {
     fn aggregate(self) -> AggregatedStream;
-
-    fn streaming_mode(self) -> ResponseStream;
 }
 
 impl AggregateStreamExt for ResponseStream {
     fn aggregate(self) -> AggregatedStream {
-        AggregatedStream::new(self, AggregateMode::AggregatedOnly)
-    }
-
-    fn streaming_mode(self) -> ResponseStream {
-        self
+        AggregatedStream::new(self)
     }
 }
 
 impl AggregatedStream {
-    fn new(inner: ResponseStream, mode: AggregateMode) -> Self {
+    fn new(inner: ResponseStream) -> Self {
         AggregatedStream {
             inner,
             cumulative: String::new(),
             cumulative_reasoning: String::new(),
             pending: VecDeque::new(),
-            mode,
         }
     }
 }

codex-rs/codex-api/src/endpoint/compact.rs

@@ -36,12 +36,9 @@ impl<T: HttpTransport, A: AuthProvider> CompactClient<T, A> {
         self
     }
 
-    fn path(&self) -> Result<&'static str, ApiError> {
+    fn path(&self) -> &'static str {
         match self.provider.wire {
-            WireApi::Compact | WireApi::Responses => Ok("responses/compact"),
-            WireApi::Chat => Err(ApiError::Stream(
-                "compact endpoint requires responses wire api".to_string(),
-            )),
+            WireApi::Compact | WireApi::Responses => "responses/compact",
         }
     }
 
@@ -50,7 +47,7 @@ impl<T: HttpTransport, A: AuthProvider> CompactClient<T, A> {
         body: serde_json::Value,
         extra_headers: HeaderMap,
     ) -> Result<Vec<ResponseItem>, ApiError> {
-        let path = self.path()?;
+        let path = self.path();
         let builder = || {
             let mut req = self.provider.build_request(Method::POST, path);
             req.headers.extend(extra_headers.clone());
@@ -139,24 +136,14 @@ mod tests {
         }
     }
 
-    #[tokio::test]
-    async fn errors_when_wire_is_chat() {
-        let client = CompactClient::new(DummyTransport, provider(WireApi::Chat), DummyAuth);
-        let input = CompactionInput {
-            model: "gpt-test",
-            input: &[],
-            instructions: "inst",
-        };
-        let err = client
-            .compact_input(&input, HeaderMap::new())
-            .await
-            .expect_err("expected wire mismatch to fail");
-
-        match err {
-            ApiError::Stream(msg) => {
-                assert_eq!(msg, "compact endpoint requires responses wire api");
-            }
-            other => panic!("unexpected error: {other:?}"),
-        }
+    #[test]
+    fn path_is_responses_compact_for_supported_wire_apis() {
+        let responses_client =
+            CompactClient::new(DummyTransport, provider(WireApi::Responses), DummyAuth);
+        assert_eq!(responses_client.path(), "responses/compact");
+
+        let compact_client =
+            CompactClient::new(DummyTransport, provider(WireApi::Compact), DummyAuth);
+        assert_eq!(compact_client.path(), "responses/compact");
     }
 }

codex-rs/codex-api/src/endpoint/mod.rs

@@ -1,4 +1,4 @@
-pub mod chat;
+pub mod aggregate;
 pub mod compact;
 pub mod models;
 pub mod responses;

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

@@ -111,7 +111,6 @@ impl<T: HttpTransport, A: AuthProvider> ResponsesClient<T, A> {
     fn path(&self) -> &'static str {
         match self.streaming.provider().wire {
             WireApi::Responses | WireApi::Compact => "responses",
-            WireApi::Chat => "chat/completions",
         }
     }
 

codex-rs/codex-api/src/lib.rs

@@ -22,8 +22,7 @@ pub use crate::common::ResponseEvent;
 pub use crate::common::ResponseStream;
 pub use crate::common::ResponsesApiRequest;
 pub use crate::common::create_text_param_for_request;
-pub use crate::endpoint::chat::AggregateStreamExt;
-pub use crate::endpoint::chat::ChatClient;
+pub use crate::endpoint::aggregate::AggregateStreamExt;
 pub use crate::endpoint::compact::CompactClient;
 pub use crate::endpoint::models::ModelsClient;
 pub use crate::endpoint::responses::ResponsesClient;
@@ -33,8 +32,6 @@ pub use crate::endpoint::responses_websocket::ResponsesWebsocketConnection;
 pub use crate::error::ApiError;
 pub use crate::provider::Provider;
 pub use crate::provider::WireApi;
-pub use crate::requests::ChatRequest;
-pub use crate::requests::ChatRequestBuilder;
 pub use crate::requests::ResponsesRequest;
 pub use crate::requests::ResponsesRequestBuilder;
 pub use crate::sse::stream_from_fixture;

codex-rs/codex-api/src/provider.rs

@@ -12,7 +12,6 @@ use url::Url;
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum WireApi {
     Responses,
-    Chat,
     Compact,
 }