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Connectors, skills and plugins

MCP servers, skills and plugins, for one agent or for all of them.

Customize (in the sidebar, or Settings › General › Customize…) has three tabs: Skills, Connectors and Plugins. Each lists what every agent already has, from its own configuration, and what you add through Newen.

Connectors

Section titled “Connectors”

Connectors are MCP servers: they give an agent tools and data from other apps and services. /mcp opens them; the message box’s + menu has Browse connectors and Manage connectors.

Add custom connector… asks for:

  • Add to: one agent, or All agents;
  • Name, and the MCP server URL, or command (https://…/mcp, or npx -y package);
  • Environment variables and, for a URL, Headers, one a line; Secret variables and Secret headers for keys;
  • Older SSE transport for servers that need it, and for Claude Code an OAuth client under Advanced settings.

Make sure you trust a server before you add it: a command runs on your computer.

Where it applies. Added to one agent, it goes to that agent’s own configuration, in the scope you choose: Claude Code offers This project, for me, This project, shared and All my projects; OpenCode All my projects and This project; Codex and Hermes All my projects. Added to All agents, Newen keeps it in its own extensions.json and gives it to every session of every agent that can use it, with a switch per agent; if an agent has its own server of the same name, the agent’s wins.

Secrets are kept in the system keychain, never in a file, and reach the agent only as variables of its process (NEWEN_MCP_<SERVER>_<KEY>).

The Directory searches the public MCP registry. An agent can also ask you for a connector while it works: a card Connectors that could help with a Connect button for each.

Skills

Section titled “Skills”

A skill is instructions an agent reads when they fit the task: a folder with a SKILL.md. Newen lists each agent’s own skills and keeps skills for all agents in its settings folder (skills/).

New skill writes one; you can also add a SKILL.md, or a .zip or .skill of its folder, and export one back as a zip. Skills for all agents reach Claude Code, Codex and OpenCode; Hermes does not take them.

Plugins

Section titled “Plugins”

/plugin opens the plugins of agents that have them (Claude Code and Codex): marketplaces, and each plugin with Install, Configure or Remove, run through the agent’s own CLI.