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Inventory is a flat list of ingredients you physically own, independent of any recipe. It exists to answer one question at the moment it matters: do I have enough Citra for this, or am I ordering again?

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Categories

Every item belongs to one of four categories, and the category decides which fields are worth filling in:
Grain, sugar, extract, adjuncts. Track colour (SRM) and extract yield, plus origin if you care which maltster it came from. Amounts are usually in kilograms.
Each item also takes freeform notes — where you bought it, when it opened, how it smelled last time.

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Units are yours

Amounts carry their own unit, as text. If you buy hops in ounces and grain in pounds, write ounces and pounds. Brewgravity does not convert or police inventory units, because the useful number here is the one printed on the bag in your freezer.

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A workflow that holds up

1

Enter what you have when it arrives

Adding a hop order takes about a minute and is the only part of this that requires discipline.
2

Check inventory while planning

Before committing to a recipe, look at what is on hand. Substituting at the planning stage is a design choice; substituting on brew day is a scramble.
3

Draw it down after brew day

Update amounts once the beer is in the fermenter, while you still remember what went in.
Inventory does not deduct itself when you brew, by design — the amount you weighed out is rarely the amount the recipe said, and a system that silently guesses wrong is worse than one that waits for you to tell it.

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Via the API

Inventory is fully available over the API and through the MCP server, including search. If you keep stock in a spreadsheet today, a short script can push it in once and keep it current from then on.