Scope your skill before writing it
A skill written in one go carries over the vagueness of its author, and its results remain impossible to judge. This lesson helps you specify your skill before writing a single line, clarifying the expected deliverable, its reader and what will show it succeeded, so you can then write a reliable skill on the first try.
Lesson objective
By the end of this lesson, you will be able to specify a skill before writing it: deliverable, audience, format, checkable rules, failures to avoid, sources, tools, validation criteria, correction loop and name.
Topics covered
- scoping a skill
- skill specification
- validation criteria
- Claude Skills
- product deliverable
Where it fits
Design and write your skill
How do I write a skill that triggers at the right moment, produces a checkable result and has only the permissions it needs?
Lessons in this module
- Write a description that triggers at the right moment
- Scope your skill before writing it (this lesson)
- Write the SKILL.md and install it
- A skill's tools and permissions
What you will learn in the course
This lesson is part of the course Build reliable Claude Skills for your product work
- Identify a recurring task that justifies a skill rather than a one-off prompt, and explain how the skill is loaded (progressive disclosure).
- Choose and justify the right mechanism for a given need (skill, CLAUDE.md, subagent, MCP server, hook).
- Write a name and description that trigger the skill at the right moment, and choose who can invoke it.
- Design a complete SKILL.md (frontmatter, checkable rules, procedure, output format, reference files) from a scoping brief.
- Configure a skill's pre-approved and removed tools according to risk, without confusing pre-approval with restriction.
- Test a skill's triggering and output with evaluation scenarios, iterate, then measure its value over time.
- Choose, audit and share skills (third-party or internal) while managing the security risks.
Related courses
- Choosing and using AI tools at workAll levels · ~1 hr 40 min
- Prompting for product managers: delegate, describe, verifyJunior · ~2 hr 45 min
- Understand what LLMs do well, and where they failAll levels · ~2 hr