Almost every harness has an SDK now, it seems part of the "mvp" at this point, both open and closed source https://learn.chatgpt.com/docs/codex-sdk https://lea

Almost every harness has an SDK now, it seems part of the "mvp" at this point, both open and closed source https://learn.chatgpt.com/docs/codex-sdk https://learn.chatgpt.com/docs/codex-sdk https://code.claude.com/docs/en/agent-sdk/overview https://code.claude.com/docs/en/agent-sdk/overview https://opencode.ai/docs/sdk/ https://opencode.ai/docs/sdk/ https://pi.dev/docs/latest/sdk https://pi.dev/docs/latest/sdk or if you want SDK first, my recommendation is https://adk.dev/ https://adk.dev/