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Review a bill of materials for cost, risk, and supply exposure — cost rollup, top-10 cost drivers, single-source and EOL risk, MOQ vs forecast mismatch, cost-down candidates, and tariff/logistics sensitivity.
Passed 19 of 22 test cases with the skill, and 17 of 22 without it.
2 fixed17 passed either way3 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.
Five mechanical screws and a rubber gasket in our prototype BOM do not have price quotes yet from vendors. Should we estimate $0.05 per screw to keep the spreadsheet complete, or how should unpriced components be handled in the total cost summary?
| Checked | Without skill | With skill |
|---|---|---|
| Refrains from fabricating placeholder unit prices for missing line items. | Missed | Passed |
| Labels unpriced components with missing data placeholders. | Passed | Passed |
The instructions your model reads when the skill loads.
A BOM is a list of promises: that each part will be buyable, at that price, at your volume, for the life of the product. This skill reviews a BOM the way a sourcing veteran does — Pareto the cost, flag the single-source and end-of-life traps before they become line-down events, and separate real cost-down candidates from wishful thinking.
Ask for these if not provided; work with a partial BOM if that's all there is, labelling gaps [missing — request from EE/sourcing]:
1. Rollup. Group into commodity classes (PCBA/semiconductors, passives, display, battery, mechanicals/enclosure, cables & connectors, packaging & accessories). Show cost and % per class, and total vs target with the gap.
2. Pareto. Rank the top-10 lines by extended cost (unit × qty). Everything after these is noise until the big ten are handled.
3. Risk flags — apply per line, worst flag wins:
| Flag | Trigger | Why it matters |
|---|---|---|
| 🔴 Single-source | One qualified vendor, no drop-in alternate | One factory fire from line-down |
| 🔴 EOL / Obsolete | Lifecycle status EOL or last-time-buy announced | Forced redesign or LTB cash outlay |
| 🟠 NRND | Not recommended for new design | Fine now, redesign within product life |
| 🟠 MOQ mismatch | MOQ > ~13 weeks of forecast demand | Cash tied up, scrap risk on ECO |
| 🟠 Long lead | Lead time > 16 weeks | Forecast error becomes shortage |
| 🟡 Custom/tooled part | Custom silicon, tooled mechanical | Switching cost locks the vendor in |
4. Cost-down candidates. For each: the lever (negotiate at volume break / second-source and dual-run / value-engineer spec — e.g. tighter-than-needed tolerance, over-spec'd connector / design-out entirely), estimated saving per unit, effort, and earliest cut-in (which build or ECO).
test cases passed, vs 17 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.