> ## Documentation Index
> Fetch the complete documentation index at: https://enact-465fb1fc.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> [!NOTE]
>
> **Protocol Revision**: 2025-06-18

Servers provide the fundamental building blocks for adding context to language models via
MCP. These primitives enable rich interactions between clients, servers, and language
models:

* **Prompts**: Pre-defined templates or instructions that guide language model
  interactions
* **Resources**: Structured data or content that provides additional context to the model
* **Tools**: Executable functions that allow models to perform actions or retrieve
  information

Each primitive can be summarized in the following control hierarchy:

| Primitive | Control | Description | Example |
| - | - | - | - |
| Prompts | User-controlled | Interactive templates invoked by user choice | Slash commands, menu options |
| Resources | Application-controlled | Contextual data attached and managed by the client | File contents, git history |
| Tools | Model-controlled | Functions exposed to the LLM to take actions | API POST requests, file writing |

Explore these key primitives in more detail below:

> **[Prompts](/specification/2025-06-18/server/prompts.md)**

> **[Resources](/specification/2025-06-18/server/resources.md)**

> **[Tools](/specification/2025-06-18/server/tools.md)**


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