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> As of Dec 2025, Sonnet/Opus and GPTCodex are both trained and most good agent tools (ie. opencode, claude-code, codex) have prompts to fire off subagents during an exploration (use the word explore) and you should be able to Research without needing the extra steps of writing plans and resetting context. I'd save that expense unless you need some huge multi-step verifiable plan implemented.

Does the UI shows clearly what portion was done by a subagent?



Yes it will, this is almost verbatim (redacted product) claude-code output from my current session:

   ● I'll explore the codebase to understand the current <redacted> architecture, testing patterns, and integration points. This will help me formulate effective strategies for reducing QA burden.

   ● 3 Explore agents finished (ctrl+o to expand)
      ├─ Explore <redacted> architecture · 57 tool uses · 60.0k tokens
      │  ⎿  Done
      ├─ Explore current testing approach · 29 tool uses · 51.7k tokens
      │  ⎿  Done
      └─ Explore API integration patterns · 44 tool uses · 71.7k tokens
         ⎿  Done
During agent execution, it also shows what each sub-agent is up to. In ctrl+o mode it'll show the prompts it passed to each sub-agent.


The UI (terminal) in Claude code will tell you if it has launched a subagent to research a particular file or problem. But it will not be highlighted for you, simply displayed in its record of prompts and actions.


If you use the vscode extension you can click to view the sub-agent prompts and see all tool calls.




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