To brief a B2B copywriter, start with the basics: what you sell, who you sell to, and what you want those people to do after reading. Be specific about the outcome. “More leads” is vague; “increase demo requests from mid-market SaaS ops teams” is actionable.
It also helps to include tone of voice guidance. Instead of “professional” or “friendly”, share examples of copy you like (or don’t like), and let me know what speaks to you in that example.
Finally, be clear about practical constraints: format, word count, SEO requirements, stakeholders involved, approval process, and deadlines.