Person
Named author of Pi, the upstream project of Oh-My-Pi.
Earendil's Pi 1.0, an agent harness whose website once advertised "No MCP", now builds MCP into its core. The team ties the reversal to Codemode, a JavaScript interpreter beside the harness loop that lets the model batch MCP calls into one script.
Reality
Earendil's Pi 1.0 coding agent ships native MCP support after more than a year of criticising the protocol, running tool calls inside a WASM sandbox. The team credits a more stateless July 2026 spec and a sandbox it already needed for non-LLM models, so MCP support was a small addition.
Reality
Pi made MCP a core feature in version 0.99.0 on September 29, 2026, after its creator Mario Zechner spent over a year arguing against the protocol. In Pi, models call MCP tools from JavaScript in a QuickJS sandbox, so tool schemas are not preloaded into context.
Reality
A seven-part video walkthrough is packaging the Flask creator's Pi workflow for a general audience. The harness itself leaves isolation to the operator, and Earendil's own documentation says so plainly.
Reality
A review of v0.84.2 is blunt: no built-in sandbox, no permission layer. Three of the four default tools change the machine, and whatever sits between them and your repo is code you own.
Reality
Oh-My-Pi makes a write conditional on the target lines still hashing the same, so the loser of a race gets an error instead of a wrecked file. The guarantee is paid for in retries.
Reality