Claude Agent SDK
Free tier availableBuild custom AI agents on Claude
About Claude Agent SDK
Anthropic's framework for building production AI agents on top of Claude — with built-in tool use, file system access, code execution, and the same orchestration that powers Claude Code itself. The most direct path for developers who want agent capabilities without rebuilding the harness from scratch, and the official SDK to use when you need to ship agents on Claude in production.
How Claude Agent SDK compares
| Directr tier | A | S | A | B |
| Price | Pay per token | Free / BYO API key | Free | From $15/mo |
| Free tier | Free tier available | Fully free; bring your own model | Free | Local-only / limited cloud sync |
| API access | ✓ | ✓ | ✓ | ✓ |
Alternatives to Claude Agent SDK
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