> ## Documentation Index
> Fetch the complete documentation index at: https://comfyui-mcp.artokun.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# July 18: the 405 that wasn't — speaking pip Manager's legacy-UI dialect

> Custom-node and model operations no longer 405 against a pip ComfyUI-Manager running in legacy-UI mode (hardcoded by popular Docker images): comfyui-mcp now detects the mode and speaks its queue/batch dialect, and Manager detection can no longer be fooled by an SPA's 200.

*July 18, 2026*

v0.38.1 plus panel 0.9.1 — one deep compatibility fix, told in full in
[the 405 that wasn't](../blog/manager-405-dialects).

## pip Manager's legacy-UI mode is a third API dialect

Popular Docker images (e.g. `yanwk/comfyui-boot`) hardcode
`--enable-manager-legacy-ui`, which swaps in Manager's bundled 3.x server under the
`/v2` prefix — a server with **no `queue/task` route**, so every custom-node and
model operation died with a 405. comfyui-mcp now detects the mode
(`/v2/manager/is_legacy_manager_ui`) and speaks its `queue/batch` dialect (#235),
on top of the two Manager generations it already handled. Manager detection also
validates the probe payload, so an SPA answering 200 to everything can't masquerade
as a Manager API. Both root causes came from two excellent community bug reports.

## Panel

Panel 0.9.1 adds the **Kimi K3 (Moonshot) provider chip** (#89), pairing with
yesterday's backend.