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Skills Versus Prompts Versus MCP

About 5 minutes

Shiori
Target audience: Those unsure whether a need calls for a skill, a prompt, a tool, or MCP
Prerequisites: Basic understanding of What Are Skills and What Is MCP

Skills, prompts, tools, and MCP all look like ways to extend what an AI can do, but each supplies something different.

What Each One Supplies

MechanismWhat it suppliesExample
PromptAn instruction for right now”Summarize this text in three lines”
SkillReusable procedure and judgment criteriaArticle writing steps, review checkpoints
ToolAn executable capabilityFile read and write, search, API calls
MCPA standard for connecting to toolsExposing an internal database through one open standard
This table scrolls horizontally. Keyboard users can focus the table and use the left and right arrow keys.

In short: a skill is the how, a tool is the what, and MCP is the wiring.

How to Decide

graph TD
    Q["What is missing"] --> A["No executable capability"]
    Q --> B["The approach varies every time"]
    Q --> C["A one-off instruction"]
    A --> T["Provide a tool"]
    T --> M["Consider MCP if the target is an external system"]
    B --> S["Capture it as a skill"]
    C --> P["Handle it in the prompt"]

Common Mix-Ups

Trying to solve with procedure what needs a capability

No amount of procedure writing answers “tell me what is in the internal database.” The capability to reach that data has to exist. That calls for a tool, and MCP if the connection should be standardized.

Rewriting the same prompt every time

Repeating the same instruction is the signal for a skill. Consolidating it means improvements happen in one place.

Packing execution detail into a skill

A skill supplies procedure; it does not execute. Deterministic work is more stable implemented as a tool than described inside a skill. A skill that walks through a long command sequence is a candidate for tooling.

They Combine

In practice these do not compete.

  • MCP provides the connection to internal document search
  • A tool exposes that search capability to the AI
  • A skill defines the procedure: search internal documents first, then cite sources
  • A prompt specifies the topic for this particular run

Summary

  • Prompts are one-off instructions, skills are reusable procedures, tools are capabilities, MCP is the connection standard
  • If a capability is missing, build a tool; if the approach is missing, write a skill
  • Repeating the same instruction is the signal to create a skill
  • The four combine rather than compete
Quiz