Scope Check is a free Agent Skill for Claude Code and Cursor, built for freelance developers, designers and small agencies. Paste a vague client message ("build me a booking site, like Calendly") and it returns unclear requirements, assumptions, risks, exclusions, acceptance criteria and up to 8 client questions, blockers first, so you can quote a fixed price without guessing. Works offline; it is a single SKILL.md. Source: github.com/KliporaHQ/scope-check-skill
I kept seeing freelancers lose margin on fixed-price jobs because the original brief was vague and nobody wrote down what was out of scope. This skill is the first step of a small workflow (quote, kickoff, change orders) that I sell as paid kits, but the skill itself is free and complete.