Unverified50% confidenceTradeoffExact time
PStack splits principles into independent skills rather than putting them into the system prompt because of Token cost: it avoids carrying a lengthy prefix on every request and enables on-demand loading.
1
Sources
50%
Confidence
Long-term
Relevance
10/21/2026
First Seen
Sources
Breaking Down PStack: A Cursor Engineer's AI Coding Skills Library and Workflow
bilibilicode炀10/18/2026
Related Entities
Related Claims
UnverifiedLoading skills on demand can save token resources and avoid filling the context with unused information.59% similarUnverifiedOverly long system prompts bring hidden overhead: for example, when the system prompt has 500 tokens while the actual input has only 50 tokens, it means 91% of the cost goes to boilerplate text; auditing and trimming the system prompt by 40% can reduce costs.57% similarVerifiedThinking tokens for reasoning models are typically billed, and setting a token budget cap can prevent runaway costs from a single request.57% similarUnverifiedBudget using standard pricing rather than promotional pricing, measure tokens per task rather than price per token, and aggressively use prompt caching to control agent workload costs.56% similarUnverifiedWhen multiple requests share the same prefix (such as a system prompt), efficient KV Cache reuse can significantly reduce computational overhead.56% similar
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