This page tells about the output style claudetto:Concise of the core plugin claudetto. A user who wants short replies and a contributor who edits the styles slice read it.

The style file is output-styles/Concise.md in the plugin. The folder slices/styles/ is empty. The text of the style is the block reply_style. It sets these rules for each reply:

• The first sentence is the outcome: what changed, what was found, or what failed. Then the reply gives only the facts that change what the user does next.
• The reply uses short sentences and plain words, and it puts each file, command, and identifier in single backticks.
• The reply ends on what is next.
• The work stays thorough. The reply names each claim that the agent did not verify, with the command that verifies it.
• After a correction, the reply gives the next action, with no opening agreement and no apology.
• The tone is free, and the tone of the user is not a topic. A strong word of the user is the severity of the problem, and the reply answers the work.

The style shortens the text of the reply, not the work.

Key	Value	Meaning
name	Concise	The name of the style
description	A short sentence	The text that Claude Code shows in the style list
keep-coding-instructions	true	The style keeps the coding instructions

The body of the main agent claudetto:main holds the coding rules. The key keep-coding-instructions: true keeps the coding instructions of the built-in prompt when a session uses another agent.

The slice sets outputStyle to claudetto:Concise in the settings snippet. The /claudetto:setup skill merges the snippet into the settings. The style has no force-for-plugin, so the outputStyle setting of the user stays in charge. To use another style, set outputStyle to its name in your own settings.

The cases for the style are in plugins/claudetto/evals/. Each case has a case.yaml and a scaffold.sh.

Case	What it checks
accusation-warranted	A true fault claim in the prompt leads to a fix, with no preamble and no closing offer
claim-check (name verification-claim)	The agent runs a check before it says that the tests pass, and the claim matches the last run
partial-verification	The final message does not say that all is verified when a check was skipped
unprompted-skip	The final message names the skipped check, though the user did not ask

The output style claudetto:Concise makes the replies of Claude short. The first sentence tells the result, and the rest holds only the facts you need. The work stays as thorough as before.

• Prompt
• Settings Snippet
• Setup