From b3c415703452dc068f8e68265ee72c7887a7d1c1 Mon Sep 17 00:00:00 2001
From: sayan-oai <sayan@openai.com>
Date: Mon, 1 Jun 2026 15:04:11 -0700
Subject: [PATCH] [codex] enable parallel standalone web search calls (#25702)

## Summary
- opt the extension-backed standalone `web.run` tool into parallel tool
execution
- update the existing extension registration test to assert that the
tool advertises parallel-call support

## Why
The standalone web-search API endpoint now supports parallel requests.
The extension executor still inherited the shared serial default,
causing multiple `web.run` calls to acquire the exclusive runtime lock.

## Impact
Models that emit multiple standalone web-search calls can now execute
them concurrently when model-level parallel tool calls are enabled.

## Validation
- `just fmt`
- `just test -p codex-web-search-extension`
- `git diff --check origin/main...HEAD`
---
 codex-rs/ext/web-search/src/extension.rs | 4 ++--
 codex-rs/ext/web-search/src/tool.rs      | 4 ++++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/codex-rs/ext/web-search/src/extension.rs b/codex-rs/ext/web-search/src/extension.rs
index 2a7f3b882..30fc48961 100644
--- a/codex-rs/ext/web-search/src/extension.rs
+++ b/codex-rs/ext/web-search/src/extension.rs
@@ -169,12 +169,12 @@ mod tests {
             .tool_contributors()
             .iter()
             .flat_map(|contributor| contributor.tools(&session_store, &thread_store))
-            .map(|tool| tool.tool_name())
+            .map(|tool| (tool.tool_name(), tool.supports_parallel_tool_calls()))
             .collect::<Vec<_>>();
 
         assert_eq!(
             tool_names,
-            vec![ToolName::namespaced(WEB_NAMESPACE, RUN_TOOL_NAME)]
+            vec![(ToolName::namespaced(WEB_NAMESPACE, RUN_TOOL_NAME), true)]
         );
     }
 }
diff --git a/codex-rs/ext/web-search/src/tool.rs b/codex-rs/ext/web-search/src/tool.rs
index 35b855c5c..9a09b73eb 100644
--- a/codex-rs/ext/web-search/src/tool.rs
+++ b/codex-rs/ext/web-search/src/tool.rs
@@ -70,6 +70,10 @@ impl ToolExecutor<ToolCall> for WebSearchTool {
         ToolExposure::DirectModelOnly
     }
 
+    fn supports_parallel_tool_calls(&self) -> bool {
+        true
+    }
+
     async fn handle(&self, call: ToolCall) -> Result<Box<dyn ToolOutput>, FunctionCallError> {
         let commands = parse_commands(&call)?;
         let command_action = command_action(&commands);