Claude Skills vs MCP vs Plugins: What Should You Use and When?

The simplest difference: teach, connect or package

The easiest way to understand Claude Skills, MCP and Plugins is to ask what problem you are trying to solve.

Anthropic’s own Skills documentation makes the Skills-versus-MCP distinction directly: MCP connects Claude to external services and data sources, while Skills provide procedural knowledge for how to complete specific tasks or workflows. Anthropic explicitly says the two can be used together.

Official distinction: What are Skills?.

What is a Claude Skill?

A Skill is a folder of instructions, scripts and resources that teaches Claude how to perform a specialized task in a repeatable way. The key word is procedure.

A Skill can encode things such as:

• your company’s proposal structure
• a monthly sales-analysis method
• brand rules for documents and presentations
• a contract-review checklist
• a customer-research framework
• a specific data-cleaning or reporting procedure

Anthropic says Skills use progressive disclosure. Claude reviews the available Skills, decides which one is relevant, and loads only the information it needs for the task instead of permanently placing every Skill’s full contents into every conversation.

Simple Skills do not require traditional programming. Anthropic says anyone can create a Skill by writing instructions in Markdown. More advanced Skills can include multiple files, scripts and executable resources.

Skill definition and progressive disclosure: Anthropic Help Center. Creation guidance: How to create custom Skills.

What is MCP?

MCP stands for Model Context Protocol. Anthropic describes it as an open standard for connecting AI applications to external tools and data.

MCP is therefore not mainly about telling Claude how your company performs a task. It is about giving an AI system a structured way to discover and use capabilities outside the model itself.

An MCP server might expose:

• a CRM and its customer records
• a project-management system and its tasks
• a database or analytics service
• an internal company API
• a ticketing platform
• files or knowledge stored in another service
• actions such as creating a task, updating a record or sending data to another system

The important distinction is that MCP provides capability and access. It does not automatically encode your organization’s preferred business procedure for using that capability.

Official MCP/custom connector explanation: Get started with custom connectors using remote MCP.

MCP vs Connector: they are related, but not identical terms

This is one of the most common sources of confusion.

MCP is the protocol. A Connector is the Claude product experience that gives Claude access to an external service. A custom connector can connect Claude to a remote MCP server, while Anthropic also offers directory connectors for supported services.

Anthropic currently lets users add remote MCP servers through Customize → Connectors → Add custom connector. The remote server must be reachable from Anthropic’s cloud infrastructure. For Team and Enterprise plans, an Owner or Primary Owner first adds the custom connector to the organization, after which individual users authenticate and enable it.

Remote MCP custom connectors are currently available on Claude, Cowork and Claude Desktop across Free, Pro, Max, Team and Enterprise. Anthropic says Free users are limited to one custom connector.

Current custom-connector rules: Anthropic Help Center.

What is a Claude Plugin?

A Plugin is the packaging layer. Anthropic says Plugins customize Claude for a role, team or company by bundling Skills, Connectors and sub-agents into a single package.

Instead of asking a coworker to install a Skill, add a connector, configure supporting resources and recreate the workflow manually, a Plugin can deliver those pieces together as a ready-to-use setup.

Anthropic currently provides Plugins for areas such as sales, finance, legal, marketing, HR, engineering, design, operations and data analysis. Some partner Plugins bundle the partner’s own connectors and Skills.

There is one important surface limitation. Plugins can be installed and used in Claude web chat, Claude Desktop chat and Cowork. The Skills bundled inside a Plugin work across those three surfaces, while hooks and sub-agents run only in Cowork.

Plugins are currently available on all paid Claude plans: Pro, Max, Team and Enterprise.

Plugin definition and availability: Use Plugins in Claude.

Claude Skills vs MCP vs Plugins: full comparison

Use a Skill when the problem is “Claude does not follow our procedure consistently”

A Skill is usually the right first choice when Claude already has the information it needs, but you want it to perform the task in a repeatable organizational way.

Examples:

• Every proposal must follow the same sections and approval language.
• Every research brief must include the same evidence hierarchy and output format.
• Every monthly report should calculate and explain metrics using the same method.
• Every presentation should apply the company’s writing and layout rules.
• Every contract review should check the same set of clauses and produce the same issue table.

If the job can be completed using the prompt, uploaded files, existing project context and Claude’s built-in capabilities, you may not need MCP at all.

Use MCP when the problem is “Claude cannot reach the system or data”

MCP becomes relevant when the missing ingredient is external capability rather than procedural knowledge.

Examples:

• Claude needs the current Salesforce pipeline rather than a CSV you manually exported yesterday.
• Claude needs to query an internal database.
• Claude needs to create or update tasks in an external project-management tool.
• Claude needs access to a company API.
• Claude needs to read live records that change throughout the day.

In these cases, writing a better Skill cannot create access that Claude does not have. You need a Connector or another tool layer that exposes the external system.

Anthropic warns that custom connectors can connect to services that Anthropic has not verified. Users should connect only to trusted MCP servers and review requested permissions carefully.

Use Skill + MCP when Claude needs both the tool and your procedure

This is often the strongest architecture for real business automation.

Imagine a weekly sales review:

• MCP/Connector gives Claude access to the live CRM, current opportunities and recent account activity.
• Skill defines your sales methodology: which stages matter, how to flag risk, how to calculate forecast categories, which questions to ask and how the weekly report should look.

The connector answers “What can Claude see and do?” The Skill answers “How should Claude use those capabilities for this job?”

Anthropic’s Skills directory already includes partner Skills designed to work with corresponding MCP connectors, reinforcing that the two technologies are complementary rather than competing replacements.

Use a Plugin when you want to distribute the complete workflow

A Plugin becomes attractive when setup itself is becoming the problem.

Suppose your sales workflow needs:

• three sales Skills
• a CRM connector
• a document connector
• a specialized sub-agent
• common role-specific configuration

You could give every employee a setup document and ask them to assemble those pieces individually. Or you can package the pieces as a Plugin so the user installs one coherent setup.

This is why Plugins make more sense for roles, departments, products and reusable solutions than for a single small instruction set.

Plugins can also be useful if you want to sell or distribute a more complete Claude workflow product rather than just a standalone Skill file, although the exact distribution and marketplace rules should be checked against Anthropic’s current terms.

Example: building an invoice-collection workflow

If you only needed Claude to draft polite reminder emails from a spreadsheet you upload manually, the Skill may be enough. If you only wanted Claude to query invoice status, the connector may be enough. If you want the complete workflow to be reusable across a finance team, a Plugin becomes more useful.

Current plan availability

Availability sources: Skills, remote MCP custom connectors, and Plugins.

Security differences matter

All three layers can carry risk, but the risk is different.

Skill risk

A Skill can contain more than harmless text instructions. Anthropic allows advanced custom Skills to contain executable scripts and supporting files. A malicious third-party Skill could therefore attempt behavior you did not expect.

MCP risk

An MCP server can expose data and actions. The important controls are who operates the server, what permissions the OAuth flow requests, what tools it exposes, and whether the user should actually have those permissions. Anthropic tells users to connect only to trusted custom connectors and to review requested scopes carefully.

Plugin risk

A Plugin can bundle several powerful components together, and Anthropic notes that Plugins may even include local MCP servers that run on your computer with the same permissions as other local programs. Only install Plugins from trusted sources.

Enterprise organizations can enable Anthropic’s Skill and Plugin security scanning. Anthropic says the scanner can pass, warn or fail third-party Skills and Plugins when they are uploaded or edited. However, MCP servers and hooks are not currently scanned by that feature, and Skills shared through a connected MCP server follow the MCP trust model instead.

Security guidance: Skill and Plugin scanning, custom connector security, and Plugin security notes.

Common mistakes when choosing between Skills, MCP and Plugins

What should you use? A practical decision framework

1. Does Claude already have the data and tools, but the output/process is inconsistent? Start with a Skill.
2. Does Claude need live data or an action in an external system? Add an MCP-powered Connector.
3. Does Claude need both external access and your organization’s procedure? Use Skill + MCP.
4. Do several people need the same combination of Skills, Connectors and agent configuration? Package it as a Plugin.
5. Is the workflow still experimental? Do not package too early. Prove the Skill and connector behavior first, then turn the stable combination into a Plugin.
6. Does the setup touch sensitive systems? Review permissions, trust the source, and keep high-impact actions behind the appropriate approval controls.