mcp_log_ui

MCP tool-call log viewer (zui) — shows what Claude Code (or any external agent) is doing in the engine. Comments are the primary human-readable signal; raw args/results hide behind a per-row expand or a verbose-mode toggle. The module is stateless from the host's perspective but keeps a few module-scoped UI prefs (showErrorsOnly, verboseMode, expandedCallIds) so they survive hot-reload.

Exports

• M.buildContent() -> any — build the toolbar + scroll-list widget tree for one frame. Re-queries the Rust-side mcpLog ring buffer each call.
• M.handleCallback(callbackId: string, data: any) -> boolean — handle a UI event (filter toggle, row expand, clear). Returns true when the event was consumed.

Usage

local McpLogUI = require("@builtin::modules.engine.editor.mcp_log_ui")

-- From the hosting window:
local content = McpLogUI.buildContent()
local handled = McpLogUI.handleCallback(callbackId, data)

Notes

• Reads the Rust-side mcpLog global; guards against the binding being absent during early boot so it can be required before ffi_callbacks has registered the global.
• verboseMode forces every row to render expanded; expandedCallIds is per-call-id sticky state for one-off expands.
• mcp-log-clear also calls mcpLog.clear() on the Rust side so the ring buffer is reset along with the cached row list.