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fnord
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lib/mcp/supervisor.ex
defmodule MCP.Supervisor do
@moduledoc """
Supervisor for MCP client instances for the current invocation.
"""
use Supervisor
alias MCP.Transport
alias MCP.FnordClient
@spec start_link(keyword()) :: Supervisor.on_start()
def start_link(opts \\ []), do: Supervisor.start_link(__MODULE__, opts, name: __MODULE__)
@impl true
def init(_opts) do
settings = Settings.new()
servers = Settings.MCP.effective_config(settings)
children =
Enum.map(servers, fn {server, scfg} ->
{kind, t_opts} = Transport.map(server, scfg)
# :name registers the Hermes supervisor process; :client_name registers
# the inner Base GenServer. These MUST be different atoms because the
# supervisor holds its name while starting children — if Base tries to
# register the same name, it collides with its own supervisor.
spec_opts = [
name: supervisor_name(server),
client_name: instance_name(server),
transport: {kind, t_opts}
]
# Use :temporary restart to prevent infinite retry loops
# Failed MCP servers will be logged but won't crash the app
Supervisor.child_spec(
{FnordClient, spec_opts},
id: {:mcp, server},
restart: :temporary
)
end)
Supervisor.init(children, strategy: :one_for_one)
end
@spec instance_name(String.t()) :: atom()
def instance_name(server), do: String.to_atom("mcp:" <> server)
@spec supervisor_name(String.t()) :: atom()
def supervisor_name(server), do: String.to_atom("mcp:sup:" <> server)
end