Jack Dorsey's Buzz puts AI agents in team chat, fully open source
Block's open, self-hostable Slack-and-GitHub rival gives agents their own identity — plus why your prompt-cache keepalive costs 8x too much.
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Your AI agents get a seat — and a real identity
Jack Dorsey's Block shipped Buzz on July 21: an open-source workspace that puts humans and AI agents in the same chat, folds in Git hosting, and gives every agent its own cryptographic (Nostr) identity. It's model-agnostic and self-hostable, with free macOS, Windows, and Linux apps live now and full source on GitHub.
Your cache keepalive is costing 8x too much
A July 21 benchmark measuring prompt-cache eviction across labs found that pinging every 30 seconds to stay warm costs ~7.8x more than a 4-minute interval. Anthropic (a hard 5-minute TTL cliff) is the only major provider where keepalives save money — about 38% on a 10-minute gap; on OpenAI's and Google's sticky caches, skip them entirely.
Anthropic's legacy prompt endpoints retire Aug 17
If your code calls Anthropic's experimental prompt tools — generate_prompt, improve_prompt, or templatize_prompt — they and the old Workbench sunset Aug 17. Saved prompts, variables, and evals don't migrate to the new Workbench, so export before the cutoff.