https://docs.claude-code-sdk.com/https://docs.claude-code-sdk.com/concepts/agent-loop/https://docs.claude-code-sdk.com/concepts/built-in-tools/https://docs.claude-code-sdk.com/concepts/mcp/https://docs.claude-code-sdk.com/concepts/permissions/https://docs.claude-code-sdk.com/concepts/skills/https://docs.claude-code-sdk.com/concepts/streaming-events/https://docs.claude-code-sdk.com/concepts/tools/https://docs.claude-code-sdk.com/configuration/https://docs.claude-code-sdk.com/quickstart/https://docs.claude-code-sdk.com/reference/public-api/