What this mod can do
- Reviewed at commit c2ee6a4
- Sees each prompt you send and can change or drop it
- Sees each subagent before it starts and can stop it or pick its model
1 more thing it can do
- Reads your prompt as you type
Good to know (3)
- Needs Claude Code 2.1.289 or newer.
- Works from an idle prompt only. A _ prompt sent mid-turn keeps the current model, and a toast says so.
- A double underscore, as in __init__.py fails, or a lone _ doesn't switch the model.
Preview
Terminal
● use-haiku+cc-plugin-agents-md: ⚡s Answered by claude-haiku-5-5
❯ _which model are you?
⚡ this prompt runs on HaikuClaude Desktop
What it does
In the author's words
Start a prompt with _ and that turn runs on Haiku, shown as you type, while it runs and under the answer.
- What you see
- A hint under the prompt and a model line under the answer
- Works in
- Terminal and Claude Desktop
- Slash commands
- None
- Uses your tokens
- No
- Changes files
- Nothing
- Network access
- None
- Reviewed commit
- c2ee6a4
- Preview recorded with
- Claude Code 2.1.309
How it works
- A leading _ lights up as you type, with a hint under the prompt
- On send, it drops the _ and adds a hidden note telling the model it is Haiku
- Every request of that turn, and of its subagents, goes to claude-haiku-5-5
- A line under the answer names the model the API says answered
Common questions
How do I use Haiku for a single prompt in Claude Code?
With this mod, start the prompt with _, as in _summarize the last commit. Claude gets the prompt without the _, that turn runs on Haiku, and the next prompt returns to the session's model.
Do subagents also run on Haiku?
Yes. Subagents that a Haiku turn starts run on Haiku too, even after the turn ends. Teammates keep their own model.
Does it work with claude -p?
Yes. claude -p "_..." switches the model the same way, but no line is added under the answer, so the output stays clean.
How can I tell which model answered?
When the turn ends, a line under the answer names the model the API reports, such as Answered by claude-haiku-5-5, or shows a warning if another model answered. While it runs, the spinner says it is on Haiku.
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