MCP inside a Claude Code session

Claude Code

Once a server is added, it shows up across the session: in /mcp, in the @ menu, as / commands and as tools Claude can call.

/mcp

manage

> /mcp
  github     ✔ connected · 42 tools
  notion     ⚠ needs authentication
  airtable   ✔ connected · 6 tools

See status and tool counts. Authenticate, reconnect, clear auth, or disable a server without removing it.

@ resources

attach

> Compare @docs:file://api/auth.md
  with the login handler

Type @ to see resources from every server next to your files. Referenced resources are attached to the prompt.

/ prompts

run

> /github:review_pr (MCP)
> /mcp__github__review_pr 482

Server prompts appear as commands. Pass arguments separated by spaces.

Tool search

automatic

  mcp__github__create_issue
  mcp__github__search_code
  … definitions load on demand

Only tool names load at start. Full definitions load when Claude needs them, so more servers cost little context.