What’s public
Two repositories landed open-source under the gramatr org:
- gramatr/brand-spec — the specification. A machine-readable format for describing a brand’s voice, tone, taboo list, and behavioral directives. Designed to be consumed by any LLM workflow, not just gramatr’s.
- gramatr/brand-spec-validator — TypeScript reference validator. Run any brand-spec document through it; get back validation errors, normalized output, or a clean pass.
Private reference implementations conform to the public spec.
Why this exists
Brand voice across LLM outputs is unmanageable at scale. Marketing has a brand book; engineers ship LLM features; the outputs drift; legal flags it; rinse, repeat. Every organization running AI is hitting this.
The brand-spec answers it with a single machine-readable source of truth that every LLM-powered surface can ingest as a behavioral directive — and the spec and the validator are open-source, so adopting them doesn’t lock anyone into gramatr.
How it fits the platform
Inside gramatr, brand-spec entries become typed behavioral directives the platform applies on every output. Outside gramatr, the spec works with any LLM workflow that can read structured input. The validator is reference-grade and forkable.