# Tools

Tools let Leilani do work beyond conversation.

Open your agent in the console and select **Tools**. The panel contains:

- **Functions**
- **MCP Servers**
- **Caches**
- **JSON Web Tokens**

## Tool types

[Functions](functions.md)

Call HTTP endpoints, send email, send SMS, or transfer calls through TEL.

[MCP Servers](mcp-servers.md)

Connect remote Model Context Protocol servers and expose approved tools during calls.

[Caches](caches.md)

Store Function outputs, generated JWTs, and reusable values for a fixed TTL.

[JSON Web Tokens](json-web-tokens.md)

Generate signed JWTs on a refresh cycle and store them in caches for Function use.

## Design guidance

- keep each tool focused on one job
- use clear names that describe the action
- write instructions that specify when the tool should and should not be used
- use JSON Schema parameters for required caller-provided values
- hide HTTP output when the raw result should not be visible to the agent
- use caches only when stale data is acceptable for the configured TTL
- test high-impact tools on a non-production agent first