# Reference

Look up MCP tool definitions and the configuration for your MCP client.

- [MCP tools](/reference/mcp-tools) — the tool catalog your AI agent can call. Auto-synced from each registered Lessly service.
- [MCP clients](/reference/mcp-clients) — per-client config paths, removal, scope, and the generic pattern for any spec-compliant MCP client.

Environment variables, platform limits, and the error code index will follow alongside future slices.