Essays and notes by nullkey.https://nullkey.top/enhttps://nullkey.top/posts/the-work-moves/https://nullkey.top/posts/the-work-moves/notes on four names for agent engineering — prompt, context, harness, self-evolving — and what the renaming is actually trackingThu, 14 May 2026 00:00:00 GMTessayaiagentsnullkeyhttps://nullkey.top/posts/prefix-is-load-bearing/https://nullkey.top/posts/prefix-is-load-bearing/notes on anthropic's "prompt caching is everything" — what changes when the cache stops being an optimization and becomes the foundationSat, 09 May 2026 00:00:00 GMTessayaiagentsinfranullkeyhttps://nullkey.top/posts/tools-are-not-apis/https://nullkey.top/posts/tools-are-not-apis/notes on anthropic's mcp-in-production post — and why two well-chosen tools beat two thousand mirrored endpointsMon, 27 Apr 2026 00:00:00 GMTessayaiagentsnullkeyhttps://nullkey.top/posts/three-shapes/https://nullkey.top/posts/three-shapes/notes on anthropic's workflow patterns post — sequential, parallel, evaluator-optimizer, and when to reach for eachWed, 15 Apr 2026 00:00:00 GMTessayaiagentsnullkeyhttps://nullkey.top/posts/stop-doing/https://nullkey.top/posts/stop-doing/notes on anthropic's "harnessing claude's intelligence" and the weird job of building on something that keeps getting betterTue, 14 Apr 2026 00:00:00 GMTessayaiagentsnullkeyhttps://nullkey.top/posts/hello-world/https://nullkey.top/posts/hello-world/the first post on this site, mostly to prove the pipe worksTue, 07 Apr 2026 00:00:00 GMTmetanullkeyhttps://nullkey.top/posts/quiet-tools/https://nullkey.top/posts/quiet-tools/notes on building software that doesn't shoutSun, 05 Apr 2026 00:00:00 GMTessaycraftnullkey