# Concepts - [Overview](https://docs.brain.fi/concepts/overview.md): The mental model in five minutes. - [Memory](https://docs.brain.fi/concepts/memory.md): What Brain knows about a tenant, where it came from, and how to query it. - [Policy](https://docs.brain.fi/concepts/policy.md): The rules a tenant signed. How decisions are made. - [Agents](https://docs.brain.fi/concepts/agents.md): Who can read, propose, and act. Internal and external. - [Internal Agents](https://docs.brain.fi/concepts/internal-agents.md): Brain-shipped agents are first-class participants, not a parallel system. - [Proof](https://docs.brain.fi/concepts/proof.md): Why every claim Brain makes is verifiable. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.brain.fi/concepts.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.