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Vercel's AI SDK harness layer now authenticates nine coding agents through their own subscriptions instead of API keys
A 14 September changelog entry says the AI SDK harness layer will use native subscription logins for Claude Code, Cline, Codex, Cursor, fx, GitHub Copilot, Grok Build, OpenCode and Pi, with no code changes needed. Credentials stay on the host and real tokens are injected at the host boundary rather than handed to sandboxes; three modes (`direct`, `auto`, `ai-gateway`) control whether subscriptions or provider keys win. For anyone running agents on a subscription rather than metered API billing, this removes the main reason to keep a separate API key around.
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