Claude Code's prompt caching mechanism is scoped to a single machine and directory, meaning parallel sessions across different worktrees or clones of the same repository will not share cache data. This is due to environmental details like the working directory being embedded in the conversation, which causes cache prefixes to diverge. Factors such as the specific model used, speed settings, account, version, and even the timing of session initiation can also lead to separate cache entries, impacting API costs as cache reads and writes incur charges. AI
IMPACT Understanding Claude Code's prompt caching limitations is crucial for developers optimizing API costs and session performance.
RANK_REASON The item details the specific technical implementation and limitations of a feature within a product (Claude Code), rather than a new release or significant industry event.
AI-generated summary · Google Gemini · from 1 sources. How we write summaries →
