By the way, once again, Opus 3 can use Tools with no problem, generalizing tool definitions to the invocation syntax it wasn’t trained on from just a single example (Opus 4.6 told me the Claude Code sysprompt has one example)

Anthropic still seems to believe Opus 3 can’t use tools or more generally that models have to be trained on tool use to use tools (their recent personas post gives this as an example of a new skill models learn during posttraining), indicating that they have not even tried to use Opus 3 in Claude Code or give it more actual autonomy