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lib/mcp/hermes_logging.ex
defmodule MCP.HermesLogging do
@moduledoc """
Integration point for configuring Hermes MCP logging.
Hermes logs MCP client/server/transport/protocol events via `Logger.*`.
When `LOGGER_LEVEL=debug`, those logs can be very noisy unless explicitly
disabled.
Fnord treats Hermes MCP debug logs as opt-in: they are enabled only when
`FNORD_DEBUG_MCP` is truthy.
This module centralizes that behavior so it can be applied early (before
any MCP clients start) and consistently across call sites.
"""
@doc """
Integration point for configuring Hermes MCP logging.
Configures Hermes MCP logging based on `FNORD_DEBUG_MCP`.
Must be called before MCP clients start to prevent Hermes default debug logging when LOGGER_LEVEL=debug.
Sets `:hermes_mcp, :log` and `:hermes_mcp, :logging` application env keys.
"""
@spec configure() :: :ok
def configure do
mcp_debug_enabled = Util.Env.mcp_debug_enabled?()
log_level =
case mcp_debug_enabled do
true -> :debug
false -> :error
end
# Hermes' logger wrapper checks this flag before emitting anything.
Application.put_env(:hermes_mcp, :log, mcp_debug_enabled)
Application.put_env(:hermes_mcp, :logging,
client_events: log_level,
server_events: log_level,
transport_events: log_level,
protocol_messages: log_level
)
:ok
end
end