Claude Code includes hardcoded rule preventing Opus 5 from using subagents

Claude Code is a system that contains a built-in instruction. The instruction explicitly directs Opus 5 not to employ subagents. This rule is hardcoded directly into the codebase. It governs how Opus 5 can operate within Claude Code. The restriction may limit certain capabilities of Opus 5. The source does not explain the rationale behind the rule. Developers may need to consider work‑arounds for this limitation. Observers may watch for future discussions or changes to the rule.