Concepts
Plain-language explanations of how MARCUS retrieves, enriches, grounds, and secures evidence.
The Concepts section explains why MARCUS behaves the way it does. These pages are written for readers who want to understand the system model without needing to read backend source code.
Use this section when you are asking questions like:
- Why did MARCUS choose those citations?
- Why can a source be searchable before every briefing field is ready?
- What does grounded really mean?
- How does the system keep one organization's data separated from another's?
Concept Map
The Retrieval System
How a question turns into retrieved passages, assembled context, and a cited answer.
The Enrichment Pipeline
What happens after upload to make a document searchable, explainable, and easier to manage.
Evidence Grounding
How MARCUS handles support, uncertainty, authority, and the limits of synthesis.
The Security Model
How authentication, CSRF protection, scoping, and tenant isolation work together.
How To Read These Pages
The best order for most readers is:
- Retrieval System
- Enrichment Pipeline
- Evidence Grounding
- Security Model
That order moves from "how the answer is produced" to "how the source becomes usable" to "how the output should be interpreted" to "how the system remains safely scoped."