brief

Brief is an AI marketing skill for Claude that turns the assistant into a full-stack marketing helper across copywriting, brand strategy, content planning, SEO, email, conversion, and measurement. It is built for marketing professionals, copywriters, solo founders, and startup teams who use Claude (via Claude Code, Claude.ai, the API, Cursor, or similar tools) and want structured marketing frameworks without hiring an agency. Brief uses a progressive-disclosure architecture, loading only the relevant reference modules when needed instead of bloating every conversation. It can draft ads, emails, landing pages, and social posts with outcome-focused messaging, run page audits and competitive analysis, build content calendars, positioning statements, and go-to-market plans, write SEO briefs and email sequences, and calculate unit economics such as CAC/LTV ratios. Built-in guardrails make it ask clarifying questions before strategy work, refuse to fabricate testimonials or statistics, flag its assumptions explicitly, and enforce a quality bar of specificity, reader-first framing, one message per asset, and honesty. According to its own documentation, the skill scored 98.9% across 26 evaluation prompts versus an 80.7% baseline. Brief is released under the MIT License and installs via a single curl command on macOS/Linux, a PowerShell script on Windows, or a git clone in Claude Code, with no API keys, dependencies, or fees required.

Drafting marketing copy, writing SEO briefs, building content calendars and go-to-market plans, running page audits and competitive analysis, creating email sequences, calculating CAC/LTV unit economics