Worth noting that OpenCode 1.3.0 had to remove the Claude Max plugin after Anthropic sent lawyers. The core issue was that OpenCode built its own OAuth flow to obtain subscription tokens and managed the auth themselves.

Anthropic considers that a violation because third parties aren't allowed to offer Claude.ai login for their products.

HolyCode uses a lighter approach, I think? It seems that it reads from the local credentials file that Claude Code already stores on the host. But unfortunately the underlying tension is the same.

Anthropic subsidizes $5k of compute on a $200 sub, but only wants you to use it through their own surfaces. Third-party tools that tap into those subsidized tokens, whether via custom OAuth or local credential files, are all in a gray area until Anthropic actually clarifies their policy.

Which, as of today, they still haven't...unfortunately.