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Skills and MCP (Model Context Protocol) servers extend the tools and context available to the Aether agent far beyond its built-in capabilities. Think of them as plug-in modules — Skills provide reusable instructions and resources, while MCP servers expose tools, resources, and prompts through a standard interface.

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Skills

Skills are packaged instructions and resources centered on a SKILL.md file. A Skill can include additional references, scripts, assets, and metadata that the agent reads when the workflow is relevant.

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Installing Skills

Install Skills from the Agent Skills page in Aether. You can add a Skill in three ways:
  • Folder import — Select a local folder containing SKILL.md.
  • Zip import — Select a .zip package containing SKILL.md.
  • Remote URL — Enter a GitHub repository/tree URL or direct .zip link.

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Selecting Skills Per Chat

Open the Skill picker in the action tray below the composer input. Each installed Skill appears as a toggle. Enable the Skills you want the agent to use in the current conversation, then send your message. Skills you select are scoped to the current chat unless you save them as defaults.

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Setting Default Skills

The built-in Skill picker changes the current chat only. Default Skills for new chats can be managed through the extension state or skills service APIs, including with the Global Skills Mod example. You can still override defaults per chat.

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MCP Servers

MCP (Model Context Protocol) servers expose tools over a standard interface that Aether speaks natively. This means any conforming MCP server — whether you built it yourself or got it from the community — can immediately hand new capabilities to the agent.

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Supported Transports

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Adding an MCP Server

  1. Go to Settings → MCP Servers.
  2. Tap Add MCP Server.
  3. Enter the server name, transport type, and the command (StdIo) or URL (StreamableHttp).
  4. Tap Save.
Once added and enabled, select the MCP server in the chat action tray. Its tools, resources, and prompts are available without Agent Mode. No restart required.

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Managing Default Skills

Use the Skill picker in the composer to enable or disable individual Skills per chat. Any configured default selection is applied automatically when you open a new chat. Changing defaults does not affect existing conversations.
The Global Skills Mod example in the Extension Developer documentation shows you how to build an extension that programmatically manages global Skill defaults across all chats. It’s a great starting point if you want to create a custom Skill management experience inside Aether.