Mistral got a US patent on tool calls in 118 days. Without prior public notice

US 12,670,045 B1 was filed on 4 March 2026 and granted on 30 June. The claims are now readable and they are narrow: a stateless sandbox that pauses a code block, ships one tool call to the client, and resumes by replaying from the top. The prior art that bears on that is durable execution, not CodeAct. The people who would know that are exactly the ones the closed prior-art window locked out.