# Hermes Agent skills vs plugins vs MCP: which to use

> Match the extension to the missing capability instead of installing three different things to solve one problem.

Canonical: https://hermeswatcher.com/learn/skills-plugins-and-mcp  
Section: Learn · Skills, plugins & MCP  
Last reviewed: Oct 19, 2026  
Basis: Explained from the official Hermes Agent docs and repository (Nous Research). Steps follow the linked official sources.

## Identify what is actually missing

A skill supplies reusable procedural knowledge. A plugin extends Hermes through code, including tools or hooks. An MCP connection makes a server's capabilities available through a standard interface. A workflow can use all three, but they are not interchangeable: instructions describing a mailbox do not grant mailbox access.

Start with the desired operation. If Hermes already has the necessary tools but repeats a complicated procedure badly, a skill may be the useful addition. If a service exposes an appropriate MCP server, evaluate that connection. A custom plugin becomes relevant when you need behavior or an integration that existing capabilities cannot supply.

## Evaluate the complete dependency chain

For each candidate, write down its source, installation scope, required executable or service, credentials, permitted actions and update owner. Then choose a small read-only operation that demonstrates the connection. For a document service, listing a known folder and opening one accessible document is more informative than a successful installation notice.

Keep the procedure portable by explaining inputs and expected outputs separately from account-specific settings. Do not put tokens in a shared skill. When documenting a workflow, name the underlying capability as well as the extension: readers need to know whether a different supported connection can accomplish the same task.

## Scope and limits

These distinctions follow the current official extension guides. Availability still depends on the installed Hermes version, active profile and extension configuration. A catalog listing is a discovery lead rather than proof of compatibility, access or quality. This page does not endorse a third-party server or imply that any extension has been executed by this library.

## Related tools

- [Turn a crowded inbox into a review queue](https://hermeswatcher.com/workflows/inbox-triage.md)
- [Build a useful GitHub issue review](https://hermeswatcher.com/workflows/github-issue-review.md)
- [Skills: reusable procedures for repeated work](https://hermeswatcher.com/tools/skills.md)
- [Plugins: add tools and lifecycle behavior](https://hermeswatcher.com/tools/plugins.md)
- [MCP: connect external tool servers](https://hermeswatcher.com/tools/mcp.md)

## Sources

- [Skills System](https://hermes-agent.nousresearch.com/docs/user-guide/features/skills)
- [Plugins](https://hermes-agent.nousresearch.com/docs/user-guide/features/plugins)
- [MCP Integration](https://hermes-agent.nousresearch.com/docs/user-guide/features/mcp)

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HermesWatcher is an independent guide. It is not affiliated with or endorsed by Nous Research. The [official Hermes Agent documentation](https://hermes-agent.nousresearch.com/docs) and [repository](https://github.com/NousResearch/hermes-agent) from Nous Research are the authority; each page here lists the official sources it was written from. If this site and the official docs disagree, trust the official docs. Index for agents: https://hermeswatcher.com/llms.txt