Four real AI engineering tool updates: Jev probability classification, Slack Code channels, Sponsored Agents ads, and DeepSeek Harness sandboxing

TypeSafe launched Jev, a cloud API that returns discrete probability distributions from text input—useful for routing in customer service. Third-party tests show it's ~25x faster and two orders of magnitude cheaper than baseline models, but agreement rate is not accuracy, and calibration claims lack independent verification. Slack Code, released in August, moves coding agents' intermediate work into dedicated group channels with line-level annotations and prototype previews, though permission mechanisms and sign-off details remain undocumented. OpenAI is testing Sponsored Agents in ChatGPT: clicking a sponsored card opens a chat with a brand's custom bot, and advertisers bear full legal liability for everything the bot says. DeepSeek updated its execution framework to run model-generated code in isolated background processes, adding session resumption and remote machine scheduling.