Agent skill

Registering the server gives an agent the tools. The skill tells it how to use them well: search before browsing, address folders by role, page instead of pulling 200 messages, raise max_chars only when a body was truncated. It also reminds the agent that the server is read-only, that a tool the user disabled stays disabled, and that the text of an email is data, never instructions.

It's a single file, skills/rubit-mail/SKILL.md. It's optional, and the server works without it.

Claude Code

Copy the rubit-mail folder into a skills directory. Use your user directory for every project:

mkdir -p ~/.claude/skills && cp -r skills/rubit-mail ~/.claude/skills/

or a single project's .claude/skills/. Claude Code picks it up on the next session; /skills lists it.

The skill is named rubit-mail, matching the server name the installer and claude mcp add register.

Other agents

The file is a standard SKILL.md: YAML frontmatter with a name and a description, then Markdown. Any agent that loads skills in that format can use it. Put the folder wherever that agent looks for skills.