Why CI cost gates should use dollar ceilings, not just percentage changes

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Most CI pipelines for AI/LLM workflows flag cost increases only as percentage deltas, which answers a developer's question but not a budget owner's. A workflow can pass every percentage check while still accumulating spend that exceeds monthly budget limits, since percentages compound quietly but dollars are what appears on invoices. Experts recommend adding an absolute per-run dollar ceiling alongside the percentage gate, calculated from actual per-token prices across input, output, and cache buckets rather than raw token counts. Each workflow should carry its own ceiling matched to its expected cost, and runs should display remaining headroom as a figure so teams can adjust limits proactively before builds start failing. An open-source GitHub Action, ci-guardrail, is available to implement both percentage and absolute dollar gating in existing pipelines.

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