What Are Agent Skills? A Developer's Guide
Agent skills give AI coding assistants like Claude Code, Codex, and Cursor specialized abilities — from deploying to Vercel to running security audits. Learn what they are, how they work, and how to install your first one.
If you’ve been using Claude Code, Codex, or Cursor, you’ve probably noticed they’re good at general coding tasks — but sometimes lack deep knowledge of specific tools and frameworks.
That’s where agent skills come in.
What is an agent skill?
An agent skill is a portable instruction set that gives an AI coding agent specialized knowledge about a specific tool, framework, or workflow. Think of it as a plugin for your AI assistant’s brain.
When you install a skill, your agent gains:
- Domain expertise — deep knowledge of a specific API, framework, or service
- Best practices — patterns and conventions the community has agreed on
- Workflow automation — the ability to perform multi-step tasks like deploying, debugging, or reviewing code
For example, installing a Vercel deployment skill means your agent knows how to configure builds, set environment variables, and deploy previews — all from a single natural language instruction.
How do agent skills work?
Under the hood, agent skills are typically Markdown files (.md) that get loaded into your agent’s context. They contain:
- System instructions — rules and knowledge the agent follows
- Tool configurations — MCP servers or CLI commands the skill can use
- Examples — sample prompts and expected behaviors
When you tell Claude Code to install a skill, it downloads the instruction file and adds it to your project’s .claude/ directory. The next time you start a conversation, the agent reads these instructions and gains the skill’s capabilities.
Skills vs MCP servers — what’s the difference?
You might have heard about MCP (Model Context Protocol) servers. Here’s the quick distinction:
- MCP servers give agents tools — they can call APIs, read databases, or interact with external services
- Agent skills give agents knowledge — they know best practices, patterns, and how to use those tools effectively
Many skills combine both: they include an MCP server for tool access and instructions for how to use those tools well. The Sentry skill, for instance, connects to the Sentry API (MCP) while also knowing how to triage errors and suggest fixes (skill knowledge).
Installing your first skill
Installation takes one command. In Claude Code, type:
/install-skillOr install a specific skill directly by its slash command. For example:
# Install the Vercel deployment skill
/vercel
# Install the GitHub PR review skill
/github
# Install the Todoist task management skill
/todoistThat’s it. The skill is now active in your project.
5 skills every developer should try first
Here are five skills that cover the most common development workflows:
1. Deploy to Vercel (/vercel)
Say “deploy this to preview” and it happens. No dashboard, no CI configuration. The skill handles build settings, environment variables, and deployment targets.
2. GitHub PR reviews (/github)
Create pull requests, review diffs, and merge — all from your terminal. The agent summarizes changes, flags potential issues, and formats commit messages.
3. Sentry error tracking (/sentry)
The agent reads your Sentry errors and suggests fixes in context. It sees both the stack trace and your codebase simultaneously, cutting debugging time significantly.
4. Supabase backend (/supabase)
Schema design, Row Level Security policies, edge functions — the agent knows the Supabase API and can scaffold auth, database queries, and real-time subscriptions.
5. Security audit (/security-audit)
Scans your codebase for injection vulnerabilities, authentication issues, and secrets committed to source. Like having a security engineer review every change.
Where to find skills
There are over 200 agent skills available today, published by companies like Anthropic, Vercel, Cloudflare, Sentry, and the open-source community.
You can browse, search, and compare them all on SkillSpot. Skills are organized by category — Engineering, Design, Marketing, Productivity, Data, and more — so you can find exactly what fits your workflow.
We also curate Skill Stacks: bundles of 4-6 skills that work well together for specific roles or workflows. Check out the Frontend Developer stack or the DevOps Essentials stack to get started fast.
What’s next for agent skills?
The agent skills ecosystem is growing fast. New skills are published every week as more developer tools ship first-party integrations. We’re seeing:
- Publisher-verified skills — official skills from tool makers like Vercel and Cloudflare
- Community contributions — developers building and sharing skills for niche tools
- Skill composition — combining multiple skills into powerful workflows
The best way to stay current is to browse the latest skills or follow @skillspotdev on X for weekly updates.
Ready to get started? Browse 200+ agent skills on SkillSpot →