Open your chat tool's settings and find custom instructions (or saved info). Add two lines: your role, and your default format preference (like 'short bullets, no hype'). Start a new chat and ask any work question. You're done when the reply follows your defaults without you restating them.
How-to · INT · INT.2
Custom instructions — set your defaults once
Standing custom instructions (tone, role, format defaults) improve every future chat; one-off prompts only fix today's.
Worked example
You keep typing 'keep it short and skip the fluff' into every chat. There's a settings page for that. Custom instructions (ChatGPT), project instructions (Claude), or saved info (Gemini) apply your defaults to every future conversation — write it once, benefit every time.