clean up instructions (#22543)

rm behavioral steering in tool docs for code mode.

codex-rs/code-mode/src/description.rs

@@ -7,10 +7,8 @@ use std::collections::BTreeMap;
 use crate::PUBLIC_TOOL_NAME;
 
 const MAX_JS_SAFE_INTEGER: u64 = (1_u64 << 53) - 1;
-const CODE_MODE_ONLY_PREFACE: &str =
-    "Use `exec/wait` tool to run all other tools, do not attempt to use any other tools directly";
 const DEFERRED_NESTED_TOOLS_GUIDANCE: &str = r#"Some nested MCP/app tools may be omitted from this description. They are still available on the global `tools` object and listed in `ALL_TOOLS`.
-To find one, filter `ALL_TOOLS` by `name` and `description`; do not print the full `ALL_TOOLS` array. Print only a small set of relevant matches if you need to inspect them."#;
+To find one, filter `ALL_TOOLS` by `name` and `description`."#;
 const EXEC_DESCRIPTION_TEMPLATE: &str = r#"Run JavaScript code to orchestrate/compose tool calls
 - Evaluates the provided JavaScript code in a fresh V8 isolate as an async module.
 - All nested tools are available on the global `tools` object, for example `await tools.exec_command(...)`. Tool names are exposed as normalized JavaScript identifiers, for example `await tools.mcp__ologs__get_profile(...)`.
@@ -256,9 +254,6 @@ pub fn build_exec_tool_description(
     deferred_tools_available: bool,
 ) -> String {
     let mut sections = Vec::new();
-    if code_mode_only {
-        sections.push(CODE_MODE_ONLY_PREFACE.to_string());
-    }
     sections.push(EXEC_DESCRIPTION_TEMPLATE.to_string());
     if deferred_tools_available {
         sections.push(DEFERRED_NESTED_TOOLS_GUIDANCE.to_string());
@@ -875,6 +870,7 @@ mod tests {
             "### `foo`
 bar"
         ));
+        assert!(!description.contains("do not attempt to use any other tools directly"));
     }
 
     #[test]
@@ -1097,5 +1093,6 @@ bar"
 
         assert!(description.contains("Some nested MCP/app tools may be omitted"));
         assert!(description.contains("filter `ALL_TOOLS` by `name` and `description`"));
+        assert!(!description.contains("do not print the full `ALL_TOOLS` array"));
     }
 }

codex-rs/core/src/tools/spec_plan_tests.rs

@@ -2265,9 +2265,8 @@ fn code_mode_only_exec_description_includes_full_nested_tool_details() {
 
     assert!(!description.contains("Enabled nested tools:"));
     assert!(!description.contains("Nested tool reference:"));
-    assert!(description.starts_with(
-        "Use `exec/wait` tool to run all other tools, do not attempt to use any other tools directly"
-    ));
+    assert!(description.starts_with("Run JavaScript code to orchestrate/compose tool calls"));
+    assert!(!description.contains("do not attempt to use any other tools directly"));
     assert!(description.contains("### `update_plan`"));
     assert!(description.contains("### `view_image`"));
 }

codex-rs/core/src/tools/spec_tests.rs

@@ -1441,6 +1441,11 @@ async fn code_mode_only_can_expose_multi_agent_v2_as_normal_tools() {
     };
     assert!(!exec.description.contains("spawn_agent"));
     assert!(!exec.description.contains("wait_agent"));
+    assert!(
+        !exec
+            .description
+            .contains("do not attempt to use any other tools directly")
+    );
 
     let spawn_agent = find_tool(&model_visible_specs, "spawn_agent");
     let ToolSpec::Function(spawn_agent) = spawn_agent else {