Open Agent SDK (TypeScript) is an open-source framework that enables building AI-powered agents without CLI dependencies, running the full agent loop in-process. It supports both Anthropic and OpenAI-compatible APIs, making it a flexible alternative to proprietary SDKs like Claude Agent SDK.
Key benefits include:
- In-Process Execution: Runs the full agent cycle internally without external subprocesses or CLI, ensuring lightweight and efficient operation.
- Multi-API Compatibility: Supports Anthropic and OpenAI-compatible endpoints, integrating with models like GPT-4o, Claude Sonnet, and others.
- Custom Tool & Skill System: Define custom tools via Zod schemas or low-level APIs, plus use bundled skills (simplify, commit, review) to extend agent capabilities.
- Lifecycle Hooks & Subagents: Leverage 20+ lifecycle events for observability and delegate tasks to specialized subagents for complex workflows.
- Session Management: Persist conversations, resume sessions, and manage multi-turn interactions with sandboxing and caching.
Perfect for developers, DevOps teams, and AI engineers building AI-powered agents, tools, or workflows, especially those needing open-source flexibility for code review, testing, and automation.
