Compares two cost-summary JSON snapshots to detect PR-level spend regressions.
npx skills add https://github.com/ruvnet/claude-flow --skill cost-diff
Please help me install this Agent Skill. Skill: cost-diff Source: https://github.com/ruvnet/claude-flow/tree/main/plugins/ruflo-cost-tracker/skills/cost-diff Command: npx skills add https://github.com/ruvnet/claude-flow --skill cost-diff
Teams running LLM workloads need to know whether a specific pull request increased API spend, but raw cost summaries alone cannot answer "what changed between these two snapshots?". This Skill computes the delta between two known-good cost-summary JSON outputs and fails CI when configurable thresholds are breached.
Compare baseline.json and current.json cost snapshots and fail the PR if total spend grew more than 10 percent or 5 dollars.
High-intent search queries and answers about installing and using this skill.
Capture a cost summary JSON snapshot on the base branch and another on the PR branch, then run cost diff with --baseline and --current. Add --alert-on-pct or --alert-on-usd thresholds so the command exits 1 and fails the PR when spend grows too much.
Pass both files to cost diff via --baseline and --current. It validates the cost-summary shape, computes per-tier and per-model deltas tagged added, removed, or changed, and prints a table sorted by absolute delta so the biggest movers appear first.
cost-diff compares two specific known-good snapshots, such as main versus a PR branch. cost-burn compares the latest bucket to the prior mean for trend detection, while cost-counterfactual compares against hypothetical always-haiku, always-sonnet, or always-opus baselines.
Yes, use --alert-on-class-pct with comma-separated class thresholds, for example cache_write:50,output:25. Valid classes are input, output, cache_write, and cache_read, and the first class to breach its threshold triggers exit code 1.
Exit code 2 indicates a configuration error: missing snapshot files, invalid JSON, or snapshots lacking the required total_cost_usd and sessionCount fields. Exit 0 means no threshold fired and exit 1 means an alert threshold was exceeded.
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