They’re not. And confusing them is costing you
weeks of wasted architecture decisions.
I just mapped the entire Agentic AI extension stack
on a whiteboard — here’s the breakdown:
𝗦𝗸𝗶𝗹𝗹𝘀
Reusable knowledge modules that agents load on-demand.
The agent scans metadata first, then loads full instructions
only when relevant. This is called Progressive Disclosure —
it keeps your context window clean while giving agents
deep domain expertise when they need it.
Think of them as training manuals for AI.
𝗠𝗖𝗣 (𝗠𝗼𝗱𝗲𝗹 𝗖𝗼𝗻𝘁𝗲𝘅𝘁 𝗣𝗿𝗼𝘁𝗼𝗰𝗼𝗹)
The universal connection layer between agents and external tools.
Standardized protocol — like USB-C for AI.
10,000+ MCP servers in the ecosystem today.
Now governed by Linux Foundation’s Agentic AI Foundation.
If Skills teach you to cook, MCP gives you the kitchen.
𝗦𝘂𝗯𝗮𝗴𝗲𝗻𝘁𝘀
Independent agent instances running in isolated context.
They can use a different model, different tools,
different permissions than the parent agent.
Like specialized team members with their own workspace.
You delegate. They execute. They return summaries.
𝗛𝗼𝗼𝗸𝘀
Deterministic scripts that fire outside the agent loop entirely.
Pre-tool, post-tool, on-edit, on-notification triggers.
The LLM does NOT control these. Pure event-driven automation.
Think of them as tripwires — when X happens, do Y. Always.
𝗖𝗟𝗔𝗨𝗗𝗘. 𝗺𝗱
Always-on project context loaded every single session.
Your conventions. Your patterns. Your team preferences.
The sticky note permanently on your monitor.
𝗣𝗹𝘂𝗴𝗶𝗻𝘀
The packaging layer that bundles everything above —
Skills + Hooks + Subagents + MCP configs
into one installable, shareable unit.
Here’s what most architects miss:
These are not competing approaches.
They are layers that stack:
Skills = WHAT to know
MCP = HOW to connect
Subagents = WHO does the work
Hooks = WHEN to automate
CLAUDE. md = WHERE you ground it
Plugins = HOW you ship it
The real power is in the combination:
CLAUDE. md loads project context
→ Skill provides domain expertise
→ MCP connects to external systems
→ Subagent executes in isolation
→ Hook automates the handoff
→ Plugin packages it all for the team
If you want to excel at building agents in 2026, stop picking one layer over another. Learn to orchestrate all six together. That’s what separates demo agents from production agents.
Which layers are you actually using today?
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Most people think Skills and MCP are the same thing.
