seed-prompt-cache-anchor

What problem does it solve?

This Skill restructures prompts to maximize Anthropic prompt caching by moving the stable instructions to the top, marking the cache breakpoint correctly, and removing per-turn-changing junk from above the breakpoint.

Core Features & Use Cases

• Identify the stable prefix in prompts that should not vary between calls.
• Place a clear cache breakpoint to separate stable content from per-turn content.
• Verify cache hit rates and the cache_creation/cache_read metrics to minimize costs.
• Applicable to long-running agent workflows using Anthropic models to reduce per-call costs.

Quick Start

Place the stable, per-turn-invariant instructions at the top and clearly demarcate the breakpoint so that only changing content sits after it.