chore: rm web-search-eligible header (#10660)

default-enablement of web_search is now client-side, no need to send
eligibility headers to backend.

Tested locally, headers no longer sent.

will wait for corresponding backend change to deploy before merging

codex-rs/core/tests/responses_headers.rs

@@ -9,14 +9,12 @@ use codex_core::ModelProviderInfo;
 use codex_core::Prompt;
 use codex_core::ResponseEvent;
 use codex_core::ResponseItem;
-use codex_core::WEB_SEARCH_ELIGIBLE_HEADER;
 use codex_core::WireApi;
 use codex_core::models_manager::manager::ModelsManager;
 use codex_otel::OtelManager;
 use codex_otel::TelemetryAuthMode;
 use codex_protocol::ThreadId;
 use codex_protocol::config_types::ReasoningSummary;
-use codex_protocol::config_types::WebSearchMode;
 use codex_protocol::protocol::SessionSource;
 use codex_protocol::protocol::SubAgentSource;
 use core_test_support::load_default_config_for_test;
@@ -87,7 +85,6 @@ async fn responses_stream_includes_subagent_header_on_review() {
         session_source.clone(),
     );
 
-    let web_search_eligible = !matches!(config.web_search_mode, Some(WebSearchMode::Disabled));
     let client = ModelClient::new(
         None,
         conversation_id,
@@ -113,15 +110,7 @@ async fn responses_stream_includes_subagent_header_on_review() {
     }];
 
     let mut stream = client_session
-        .stream(
-            &prompt,
-            &model_info,
-            &otel_manager,
-            effort,
-            summary,
-            web_search_eligible,
-            None,
-        )
+        .stream(&prompt, &model_info, &otel_manager, effort, summary, None)
         .await
         .expect("stream failed");
     while let Some(event) = stream.next().await {
@@ -198,7 +187,6 @@ async fn responses_stream_includes_subagent_header_on_other() {
         session_source.clone(),
     );
 
-    let web_search_eligible = !matches!(config.web_search_mode, Some(WebSearchMode::Disabled));
     let client = ModelClient::new(
         None,
         conversation_id,
@@ -224,15 +212,7 @@ async fn responses_stream_includes_subagent_header_on_other() {
     }];
 
     let mut stream = client_session
-        .stream(
-            &prompt,
-            &model_info,
-            &otel_manager,
-            effort,
-            summary,
-            web_search_eligible,
-            None,
-        )
+        .stream(&prompt, &model_info, &otel_manager, effort, summary, None)
         .await
         .expect("stream failed");
     while let Some(event) = stream.next().await {
@@ -248,66 +228,6 @@ async fn responses_stream_includes_subagent_header_on_other() {
     );
 }
 
-#[tokio::test]
-async fn responses_stream_includes_web_search_eligible_header_true_by_default() {
-    core_test_support::skip_if_no_network!();
-
-    let server = responses::start_mock_server().await;
-    let response_body = responses::sse(vec![
-        responses::ev_response_created("resp-1"),
-        responses::ev_completed("resp-1"),
-    ]);
-
-    let request_recorder = responses::mount_sse_once_match(
-        &server,
-        header(WEB_SEARCH_ELIGIBLE_HEADER, "true"),
-        response_body,
-    )
-    .await;
-
-    let test = test_codex().build(&server).await.expect("build test codex");
-    test.submit_turn("hello").await.expect("submit test prompt");
-
-    let request = request_recorder.single_request();
-    assert_eq!(
-        request.header(WEB_SEARCH_ELIGIBLE_HEADER).as_deref(),
-        Some("true")
-    );
-}
-
-#[tokio::test]
-async fn responses_stream_includes_web_search_eligible_header_false_when_disabled() {
-    core_test_support::skip_if_no_network!();
-
-    let server = responses::start_mock_server().await;
-    let response_body = responses::sse(vec![
-        responses::ev_response_created("resp-1"),
-        responses::ev_completed("resp-1"),
-    ]);
-
-    let request_recorder = responses::mount_sse_once_match(
-        &server,
-        header(WEB_SEARCH_ELIGIBLE_HEADER, "false"),
-        response_body,
-    )
-    .await;
-
-    let test = test_codex()
-        .with_config(|config| {
-            config.web_search_mode = Some(WebSearchMode::Disabled);
-        })
-        .build(&server)
-        .await
-        .expect("build test codex");
-    test.submit_turn("hello").await.expect("submit test prompt");
-
-    let request = request_recorder.single_request();
-    assert_eq!(
-        request.header(WEB_SEARCH_ELIGIBLE_HEADER).as_deref(),
-        Some("false")
-    );
-}
-
 #[tokio::test]
 async fn responses_respects_model_info_overrides_from_config() {
     core_test_support::skip_if_no_network!();
@@ -368,7 +288,6 @@ async fn responses_respects_model_info_overrides_from_config() {
         session_source.clone(),
     );
 
-    let web_search_eligible = !matches!(config.web_search_mode, Some(WebSearchMode::Disabled));
     let client = ModelClient::new(
         None,
         conversation_id,
@@ -394,15 +313,7 @@ async fn responses_respects_model_info_overrides_from_config() {
     }];
 
     let mut stream = client_session
-        .stream(
-            &prompt,
-            &model_info,
-            &otel_manager,
-            effort,
-            summary,
-            web_search_eligible,
-            None,
-        )
+        .stream(&prompt, &model_info, &otel_manager, effort, summary, None)
         .await
         .expect("stream failed");
     while let Some(event) = stream.next().await {

codex-rs/core/tests/suite/client.rs

@@ -1340,15 +1340,7 @@ async fn azure_responses_request_includes_store_and_reasoning_ids() {
     });
 
     let mut stream = client_session
-        .stream(
-            &prompt,
-            &model_info,
-            &otel_manager,
-            effort,
-            summary,
-            true,
-            None,
-        )
+        .stream(&prompt, &model_info, &otel_manager, effort, summary, None)
         .await
         .expect("responses stream to start");
 

codex-rs/core/tests/suite/client_websockets.rs

@@ -47,7 +47,6 @@ struct WebsocketTestHarness {
     model_info: ModelInfo,
     effort: Option<ReasoningEffortConfig>,
     summary: ReasoningSummary,
-    web_search_eligible: bool,
     otel_manager: OtelManager,
 }
 
@@ -198,7 +197,6 @@ async fn responses_websocket_emits_reasoning_included_event() {
             &harness.otel_manager,
             harness.effort,
             harness.summary,
-            harness.web_search_eligible,
             None,
         )
         .await
@@ -269,7 +267,6 @@ async fn responses_websocket_emits_rate_limit_events() {
             &harness.otel_manager,
             harness.effort,
             harness.summary,
-            harness.web_search_eligible,
             None,
         )
         .await
@@ -455,7 +452,6 @@ async fn websocket_harness_with_runtime_metrics(
     .with_metrics(metrics);
     let effort = None;
     let summary = ReasoningSummary::Auto;
-    let web_search_eligible = true;
     let client = ModelClient::new(
         None,
         conversation_id,
@@ -474,7 +470,6 @@ async fn websocket_harness_with_runtime_metrics(
         model_info,
         effort,
         summary,
-        web_search_eligible,
         otel_manager,
     }
 }
@@ -491,7 +486,6 @@ async fn stream_until_complete(
             &harness.otel_manager,
             harness.effort,
             harness.summary,
-            harness.web_search_eligible,
             None,
         )
         .await