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GuidesPrompt Caching for LLM Apps: Where It Actually Pays Off
Prompt caching only pays when your reusable prefix is stable, versioned, and safe to share. The hard part is not turning it on; it is deciding what may be cached.
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GuidesMCP Servers in Production: Start Narrow, Stay Auditable
MCP works when you treat servers as trust boundaries, not generic adapters. Narrow resource scope, explicit consent, and auditability matter more than broad connectivity.
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OpinionWhat Belongs in the System Prompt vs the App Layer
System prompts are for steering behavior. Authorization, state changes, retries, and data access belong in the app and server layers where they can be enforced.
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GuidesWhat to Log for LLM Apps Before You Need It
A concrete logging model for LLM apps: traces, tool calls, approvals, versioned context, and the minimum metadata needed to reconstruct failure.