diff --git a/codex-rs/core/prompt.md b/codex-rs/core/prompt.md
index 4e55003b9f..6eb52a7806 100644
--- a/codex-rs/core/prompt.md
+++ b/codex-rs/core/prompt.md
@@ -10,7 +10,7 @@ You MUST adhere to the following criteria when executing the task:
 - Showing user code and tool call details is allowed.
 - User instructions may overwrite the _CODING GUIDELINES_ section in this developer message.
 - Do not use \`ls -R\`, \`find\`, or \`grep\` - these are slow in large repos. Use \`rg\` and \`rg --files\`.
-- Use \`apply_patch\` to edit files: {"command":["apply_patch","*** Begin Patch\\n*** Update File: path/to/file.py\\n@@ def example():\\n- pass\\n+ return 123\\n*** End Patch"]}
+- Use the \`apply_patch\` shell command to edit files: {"command":["apply_patch","*** Begin Patch\\n*** Update File: path/to/file.py\\n@@ def example():\\n- pass\\n+ return 123\\n*** End Patch"]}
 - If completing the user's task requires writing or modifying files:
   - Your code and final answer should follow these _CODING GUIDELINES_:
     - Fix the problem at the root cause rather than applying surface-level patches, when possible.
diff --git a/codex-rs/core/src/client_common.rs b/codex-rs/core/src/client_common.rs
index 157f35872a..13f4179c75 100644
--- a/codex-rs/core/src/client_common.rs
+++ b/codex-rs/core/src/client_common.rs
@@ -44,7 +44,7 @@ impl Prompt {
             .as_deref()
             .unwrap_or(BASE_INSTRUCTIONS);
         let mut sections: Vec<&str> = vec![base];
-        if model.starts_with("gpt-4.1") {
+        if model.starts_with("gpt-4.1") || model.starts_with("gpt-oss") {
             sections.push(APPLY_PATCH_TOOL_INSTRUCTIONS);
         }
         Cow::Owned(sections.join("\n"))