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Dev.to

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22:59
2026-09-29
dev.to
large-language-models

Claude Prompt Caching Hit Rate Was 0%. One Timestamp Did It

A developer running Preterview, a voice interview practice platform, discovered that Claude prompt caching produced a 0% hit rate across 3,412 calls because a `datetime.now()` timestamp placed at the …

21:45
2026-09-29
dev.to
ai-agents

A Portable Agent Contract Cannot Link to a Local Plan

A developer argues that portable agent contracts break when instructions in AGENTS.md link to planning files that exist only on one machine, and proposes the APC/APX split to fix it. Under the approac…

21:35
2026-09-29
dev.to
ai-agents

Measuring AI Impact: Moving Beyond Surface Usage Metrics

A developer working with Vinkius's AI Power User Analytics Engine, an MCP connector built on the open-source MCPFusion TypeScript framework, argues that SaaS teams should track AI feature depth and ex…

20:52
2026-09-29
dev.to
ai-agents

The agent proposes; the runtime presses the button

A developer argues that middleware-layer agent governance, such as Microsoft's open-source Agent Governance Toolkit, shares a trust boundary with the agents it governs, so a prompt-injected or turned …

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