CN-provider accounts explicitly configured with api_protocol=anthropic
(the frontend offers per-provider presets such as GLM Anthropic) fell
through the account-test router to the generic Claude tester, which:
- appended ?beta=true, which the native passthrough deliberately avoids
for third-party Anthropic endpoints, and
- defaulted a missing base_url to https://api.anthropic.com — sending
the provider's API key to Anthropic instead of the provider's own
Anthropic-compatible endpoint (guaranteed 401 plus cross-provider
credential exposure).
Route them to a dedicated probe that mirrors the adaptive Anthropic
check: resolve the endpoint via GetAnthropicProtocolBaseURL (same
resolution as real /v1/messages forwarding, including per-platform
defaults), use the shared API-key auth header, and mark 401/403 as the
account error state.
Also fail fast with an actionable hint when the anthropic-protocol
base_url still points at an OpenAI-compatible endpoint (paas path,
version segment, or chat/completions suffix): the naive {base}/v1/messages
join would 404 (e.g. /api/paas/v4/v1/messages) without any pointer to
the actual misconfiguration.
HypoxanthineOvO