Prefixwise

About

Prefixwise is a local proxy and CLI that sits between an agent and an LLM provider and names the cause of each prompt cache miss, such as tools sent in a different order. It prices the miss, can repair the request with an optimize flag, and can fail CI when a change would break the cache. It stores hashes and counts rather than prompts, and works with OpenAI, Anthropic, and vLLM.