Three engines share the fx: prefix — they are not interchangeable.
Full guide (Markdown, same content as the docs site): formula-engine
| Engine | Where | Reference |
|---|---|---|
| Charging | Deck Builder — lengths, mass, primers, swaps | Deck Builder Formula Guide |
| Print template | XLSX print template cells | Print Formula Reference |
| Blast group | Assign Group — Formula field | Blast Group Formulas |
| Goal | Engine | Example |
|---|---|---|
| Stem below 3.5 m collar | Charging | fx:holeLength - 3.5 |
| Total drill metres on report | fx:round(sum(holeLength[i]), 1) | |
| Holes shorter than 2 m | Blast group | fx:holeLength < 2 |
fx: for exports and new work.Install the Kirra Formula skill so Claude picks the right engine and traces your formula: Formula Skill — Install & Use. Download: kirra-formula.zip
Kirra Licence v1.0 — Free for mining, quarrying, construction, and research. About & licensing.