# Tool Domain

Tools are either external endpoints or managed deployments.

## Core Fields

All tools share these core fields:

- identity: id, name
- presentation: icon, description, tags
- classification: mode
- transport: transport
- placement: stack

## Transport

Tool transport is one of:

- sse
- http

## External Tool

External tools define how to call a remote MCP endpoint.

- endpoint
- auth configuration
- optional availability status

## Managed Tool

Managed tools define runtime/deployment configuration.

- runtime template
- optional deployment status

## Tool Union

- Tool = ExternalTool | ManagedTool