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MCP

Chapter 15: MCP — plug in external tools ​

MCP (Model Context Protocol) is a standard protocol for letting the AI connect to external tools/data sources. Think of it as plugging a USB stick or attaching a sensor to the AI.

Reading time: about 10 minutes.

15.1 What is MCP? ​

MCP is a standard protocol for the AI to connect external tools/data sources. With it, the AI is no longer limited to built-in tools — it can also call third-party professional tools (e.g. database queries, weather queries).

Lyra Code supports both roles:

  • MCP client: the AI connects to MCP servers provided by others and uses their tools;
  • MCP server: Lyra Code's own Agent tools are exposed for other MCP clients to use.

15.2 As a client (the AI connects to others' tools) ​

  • You can add local or remote MCP servers on the MCP server page:
    • SSE or HTTP connections supported;
    • Remote MCP servers (Streamable HTTP or SSE) supported;
  • MCP tools run on external servers and do not automatically get access to your phone's files — every call needs your approval;
  • Configuration needs the server address and any required Token/auth info;
  • After adding, you can see the new MCP tools on the AI Agent tools page — they carry an MCP prefix, easy to recognize.

15.3 As a server (expose Lyra Code's abilities to others) ​

  • You can enable the MCP server here, exposing the app's current Agent tools for other MCP clients on the local network and beyond;
  • Custom port and optional auth key supported;
  • ⚠️ Exposing to the LAN = other devices can access it — you must set an auth key; exposing to the public internet is riskier and should be avoided unless necessary.

If you find this app's native tools great but prefer chatting and working in other Agent software, use this feature to provide your tools to those apps.

15.4 Security notes ​

  • MCP tools run on external servers — before calling one, confirm its source is trustworthy;
  • MCP tools don't automatically get access to your phone's files — every call needs your approval;
  • Always set an auth key before exposing the MCP server; don't expose it to the public internet unless necessary;
  • You are responsible for trust decisions about remote MCP services — don't use anything from unknown sources (more security practices in Chapter 22).

End of chapter · Next: Mini Server — run a website on your phone

AGPLv3

Lyra Code Documentation