Two agent codebases, same feature, and a 53,713-line gap.

Pi Ships Zero Lines of MCP. Codex Ships 53,713.

I grepped Pi's entire source tree for MCP support. Three hits, all incidental, one of them inside a vendored syntax highlighter. Codex had 53,713 lines across three crates when I counted on September 1.

I re-ran the count a week later. 55,418, across two crates. One had been deleted outright.

That movement is the point. Neither team is wrong. But a number that size, shifting three percent in a week with a whole crate disappearing, is not a fact about MCP. It is a fact about how much surface you take on when you decide a protocol is infrastructure, and about who keeps paying for that surface after the decision feels finished.

Also this week:

• Your Agent Session Is a Tree. Your Code Thinks It Is a List. Three agents, three answers to the question most agent code never asks: what is the durable unit of state here?

Harrison