Enable an MCP server automatically for all models of a custom endpoint #15165

[izabel-usheva]

Hi,

we use a custom endpoint in LibreChat that provides multiple models dynamically. We would like one specific MCP server to always be enabled for every model behind this endpoint, without requiring users to select it manually from the MCP dropdown.

We currently understand the following:

startup: true initializes the MCP connection but does not automatically select the server for a conversation.
chatMenu: true only makes the server available in the dropdown.
modelSpecs.mcpServers can enable it automatically, but this requires maintaining a separate Model Spec for every model.
Is there an existing configuration that enables an MCP server for all current and dynamically added models of a custom endpoint?

Conceptually, we are looking for something like:

endpoints:
custom:

• name: "Test"
  requiredMcpServers:
• "test"

The MCP server should remain connected and available for every request through this endpoint, without manual selection by the user.

If this is not currently supported, would an endpoint-level configuration such as requiredMcpServers be considered for an upstream contribution?

Thank you!

[jialiuyang]

there is no endpoint level requiredMcpServers today
startup true only connects the MCP process at app start it do not pin that server onto every new chat
chatMenu true only puts it in the dropdown
the only stock way to auto-select an MCP for a chat is modelSpecs mcpServers and that is per model spec so a custom endpoint that invents models at runtime has nothing to attach to
workaround if the model list is known make one model spec per model and list the same mcp server on each if models are fully dynamic that workaround does not scale
endpoints.custom.requiredMcpServers is not in librechat