Claude Agent SDK
Build agents with Claude
Anthropic's SDK for building Claude-powered agents and agentic workflows.

Recent stories
Anthropic paused a same-day policy change that would have moved Claude Agent SDK, claude -p, and third-party SDK apps onto separate monthly credits. Existing subscription-backed workflows continue unchanged for now, but teams should watch for the redesigned billing plan.
CopilotKit shipped an AG-UI integration that streams Claude Agent SDK agents into web and mobile frontends with generative UI and approval checkpoints. The adapter lets teams embed terminal-first Claude agents in React, Vue, Angular, and React Native without rewriting transport or state plumbing.
A day after developers flagged Anthropic’s SDK credit split, Claude Code users said -p work had become metered, slower, and harder to run headlessly. Anthropic reset 5-hour and weekly limits, and Claude Code 2.1.143 added projected context-cost estimates.
Users reported cancellations, pricing math, and harness-specific workarounds after Anthropic said Claude Agent SDK usage would move to monthly credits on June 15. The change shifts third-party Claude agent economics and is already pushing some users toward other runtimes and tools.
Anthropic will move Claude Agent SDK, claude -p, GitHub Actions, and third-party agent apps onto separate monthly credits on June 15. Watch the new bucket closely, since it changes the cost model for autonomous runs and subscription-backed harnesses.