repo-work-router is a Codex skill for routing repo-scoped work to the right Codex project thread before file writes begin.
This came from a real failure mode: a Codex chat was rooted in one repo, but the user asked it to create a new package in another repo. Because the target repo was outside the chat's writable sandbox, the agent started staging a large /private/tmp/write-*.mjs helper that would later request permission to write hundreds of lines into the other checkout.
That was the wrong shape of solution. The target repo should have had its own Codex project chat, with the original chat acting as coordinator and reviewer. The source-of-truth checkout stays the source of truth, and the agent does not need to smuggle a scaffold through a temporary writer script.