# Layer 7 · Orchestration & Tooling

URL: https://justuju.org/layer/orchestration-tooling/

The glue around a model call: prompts, retrieval, tools, frameworks, evaluation and guardrails.

Gives the layer above: Reliable, grounded model calls that can use your data and tools.
Needs from the layer below: An inference endpoint from Inference & Optimization.

## Concepts

- [Retrieval-augmented generation (RAG)](https://justuju.org/concept/rag/): Look up relevant documents first, then give them to the model to answer from.
- [Tool use & protocols (MCP)](https://justuju.org/concept/tool-use/): Letting a model call functions and services through structured requests, standardised by protocols such as MCP.
- [Memory](https://justuju.org/concept/memory/): How an AI application remembers beyond one call: short-term memory in the context window, long-term memory in stores it saves to and searches.
- [Context engineering](https://justuju.org/concept/context-engineering/): Choosing what goes into the model's context window, in what order, and what to leave out, because the model sees nothing else.
- [Guardrails & evals](https://justuju.org/concept/guardrails-evals/): Checks around model calls (input and output filters, permission gates, prompt-injection defences) plus automated tests that measure whether the system still behaves.

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Justuju · https://justuju.org/ · Content CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Quote with a link to the page.