MCP

An MCP server is an external program that gives the agent extra tools. Lyra connects over stdio, Streamable HTTP and SSE.

Adding a server

• From the Plugin Market: filter for MCP. Servers arrive switched off, so switch them on yourself; if one needs a key, fill it in first Next release
• By hand: Settings → Plugins → MCP → ⋯ → Add a stdio server or Add an HTTP server. See Connect an MCP server.

Every MCP server, typed in or installed, lives in one place: Settings → Plugins → MCP.

Status

Each server gets a card that shows where it stands:

State	The card shows
Connected	How many tools it provides
Could not connect	The error
Needs a key Next release	Which values are missing; the server won’t start until they’re filled in
Off	The switch is off

Good to know

• Tools are named mcp__<server>__<tool>, so they never clash with built-ins.
• The model asks before calling an MCP tool; you can pick Stop asking for a single tool. In Full access it just runs.
• Every server that’s on adds its tool descriptions to the context. Switch off what you don’t use — the context ring shows what they cost.
• MCP settings can’t be changed from the phone.
• Keys you enter in Lyra are encrypted on this machine, never written to settings.json and never synced to your phone Next release

Caution

A stdio server runs on your machine with your permissions. Before switching one on, check its launch command.