Agent Skills vs Model Context Protocol
Agent skills are folders of instructions, scripts and reference files that teach an agent how to do a kind of task, loaded into context only when relevant. The Model Context Protocol connects an agent to external tools and data through servers. Skills supply procedures and knowledge, while MCP supplies capabilities, and the two are often used together.
Definitions
- Agent Skills PTL-0148
- Agent skills are packaged folders of instructions, scripts, and reference files, each anchored by a SKILL.md file with a name and description, that an agent loads only when a task calls for them.
- Model Context Protocol PTL-0061
- The Model Context Protocol (MCP) is an open standard, introduced by Anthropic in 2024, that defines how applications expose tools, data resources, and prompt templates to language-model clients through a common client-server interface.
Differences
| Agent Skills | Model Context Protocol | |
|---|---|---|
| What it provides | Instructions and procedures | Tools and data access |
| Form | A SKILL.md file plus supporting files | A server speaking the protocol |
| Context cost | Only a short description until the skill is needed | Tool definitions, unless tool search defers them |
Which to use
- Write a skill to capture how your team does a recurring task.
- Build an MCP server to give agents access to a system or data source.
Sources
- Anthropic (2025). Equipping agents for the real world with Agent Skills.
- Anthropic (2024). Introducing the Model Context Protocol.
- Model Context Protocol (2026). Specification (version 2026-07-28).
Cite this page
Protologue. (2026). Agent Skills vs Model Context Protocol. In Protologue: A Taxonomy of Prompting and LLM Techniques (v1.4.0). https://protologue.com/compare/agent-skills-vs-model-context-protocol/