Basically, as long as you are using an Anthropic library or tool, you can use your OAuth credentials. For example, you can use the Claude Agent SDK with your OAuth credentials. This is sweet because I can prototype all sorts of agents with Claude Code embedded inside, at a predictable monthly cost. One nice use case is turning skills into standalone tools or apps. You can also do convoluted things like run Claude Cod…
This URL: https://code.claude.com/docs/en/agent-sdk/overview
Says this: "Unless previously approved, Anthropic does not allow third party developers to offer claude.ai login or rate limits for their products, including agents built on the Claude Agent SDK. Please use the API key authentication methods described in this document instead."
Again, it seems Anthropic prefers to bill API token rates (long run), not subscriber effective token rates.