Anthropic Limited Claude Subscription Usage for Third-Party Harnesses. So We Ported NanoClaw to Codex

NanoClaw started as an app effectively built by running Claude inside its own repo. Porting it to Codex meant rewriting not just the runtime, but the markdown instruction layer Claude had been using to build and operate the system. Most "AI app ports" are not actually ports. They are usually one of these: swap the SDK change the model name keep the old runtime assumptions call it done This was not that. On April 4, Anthropic began limiting Claude subscription usage for third-party harnesses, including tools in the OpenClaw/NanoClaw category, pushing that usage toward extra paid usage instead of normal subscription limits. That policy shift did not magically make NanoClaw unusable overnight, but it did make one thing obvious: Building a serious agent system on top of a first-party subscription runtime is not a stable foundation. NanoClaw started life as something much stranger and much more interesting: an agent harness that was not just running on Claude-native assumptions , but was al