> Index of every Falcon docs page, for assistants: https://falcon.com/docs/llms.txt

# Base agent parts

On Built on this, a part is fixed when its switch is off (Can't change), or open as Can add to or Can change.

Open the base agent, then **Built on this**. The page is titled **Built on this**. It says **Decide what agents built on** that agent **may change. Anything they can't change is hidden from their authors and always comes from here.** A part left off is fixed. The page does not show a control named Fixed. Each switch is named for the open choice, and it saves at once. The page says **Saved.**

## Instructions

The section is **Instructions**. The note says **Builders never see these; they write only their own words in the sections you open to them.** Each section is a switch named **Can add to**. Off means **Can't change**: builders never see that wording. On means they may add their own words in that section. Instructions do not offer **Can change**.

Open **What a new base starts with**. It says **A new base lets instruction sections change, lets each of its skills be added to, and locks everything else. Turn a skill's Can add to off to keep it invisible.**

## Skills

- The section is **Skills**. The note says **Each can be added to. A skill they can't change is invisible to them.**
- Each skill is a switch named **Can add to**. Off shows **Can't change: agents built on** that agent **never see it exists**.
- **They can add skills of their own** lets a built agent pick skills the base does not have.

## Tools, memory and settings

The section is **Tools, memory and settings**. The base agent's own tools are always included. **They can add more of the company's tools** is a switch. Its note says **Company members only; community authors never add tools.**

Each setting below is a switch named **Can change**. Off is **Can't change** (fixed). On lets the built agent change that setting.

| Setting | Switch |
|---|---|
| Memory types and retention | Can change |
| Model | Can change |
| Usage limit | Can change |
| Voice on or off | Can change |
| Feminine and masculine voices | Can change |
| Voice used until someone chooses | Can change |
| Voice model, image, where it runs, policy | Can change |

## What the built agent sees

- On the built agent's **Instructions**, a locked part is one line. It does not show the base's words.
- A part they may add to says **You can add to this**.
- The note says **You can't see or change these. They are always part of** the agent **and count towards its length.**
- A skill that comes from the base says **Comes from** that base, **so it can't change here**.

If a save does not go through, the page says **That could not be saved. Read the page again and try once more.** If the page cannot be read, it says **This page could not be read.**

## Related

- [Build an agent](https://falcon.com/docs/build-an-agent)
- [Write a skill](https://falcon.com/docs/write-a-skill)
- [Add a skill to an agent](https://falcon.com/docs/add-a-skill)
- [Skill categories](https://falcon.com/docs/skill-categories)
- [Add a knowledge base](https://falcon.com/docs/add-a-knowledge-base)
- [Knowledge searches](https://falcon.com/docs/knowledge-searches)
- [Start a workflow](https://falcon.com/docs/start-a-workflow)
- [Before the agent](https://falcon.com/docs/preprocess)
- [Agents](https://falcon.com/docs/agents)
- [Workflows](https://falcon.com/docs/workflows)