Tip: DeepSeek-Reasonix Keeps Planner and Executor in Separate Sessions to Avoid Trashing the Prefix Cache

GitHub·medium signalXBlueskyLinkedInCopy link

Reasonix is a single static CGO-free Go binary (darwin/linux/windows, amd64+arm64) built entirely around DeepSeek's prefix cache: the harness keeps planner and executor in separate sessions rather than injecting planning turns into the executor's conversation, because a mid-conversation planning turn breaks the exact-token prefix match and forces a full-price cache miss. That is a transferable technique for any cached-prefix provider — if you interleave meta-reasoning into a long agent session, you pay full input rate for every turn after it. Built-in tools cover read/write/edit/multi_edit/glob/grep/ls/bash/web_fetch/todo_write behind a permission gate and sandboxed bash.