Capabilities overview - Locus

Locus exposes its knowledge through a small set of capabilities. Each one is a single engine behind a thin REST route and a curated MCP tool — same behavior on both surfaces.

Capability	Use it when you want…	Status
search	structured, citable sources for a query	Available
answer	a concise, cited answer	Available
context	an answer that accounts for a patient profile	Available
atb	a deterministic antibiotic decision	Roadmap
drug	structured medication data	Roadmap

How they build on each other

search   ── retrieval foundation
  └── answer    = search + relevance ranking + answer composition
        └── context  = answer + coarse patient profile + conflicts

search is the foundation; answer and context call it internally. atb and drug are independent engines (no retrieval dependency).

Routing guidance

A guideline / recommendation lookup → search, answer, or context.
An antibiotic decision → atb (roadmap).
A medication datum → drug (roadmap).