A new repl_mcp_needs_auth message kind exists internally but currently renders no content and nothing creates it
What
A new event/message kind called repl_mcp_needs_auth was added internally alongside existing kinds like max_turns_reached and poll_events. It appears in the enumerations/state-key lists used for these message kinds, and in the renderer map that turns message kinds into visible content, repl_mcp_needs_auth is wired to a handler that always returns an empty array, meaning it produces no visible content.
Why
Nothing in the current code actually constructs a message of this kind, so this has no visible effect yet. It looks like groundwork for a future feature (likely related to an MCP server, a way of connecting external tools, needing authentication) that has not been wired up to actually fire.
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