---
title: Extension reference
type: overview
status: active
owner: locus-pi maintainers
tags: [extensions, reference]
updated: "2026-09-22T16:20:55Z"
source_commit: "54dea11dbe11"
update_event: "user_request"
context: "changes=XL files=71 task=T-101"
description: "Clarify the documentation entry points, canonical workflow guides, and installed example navigation."
---

# Extensions

locus-pi includes six extensions. Workflows coordinate the work; the other
extensions help you run agents, choose models, answer questions, and inspect progress.

<!-- locus:extensions:start -->
<!-- Generated by `npm run build:catalogs`. Edits between these markers are overwritten. -->

| Extension             | What it adds                                                          | Learn more                                           |
| --------------------- | --------------------------------------------------------------------- | ---------------------------------------------------- |
| `agents`              | Launch child agents and inspect their progress and results.           | [Guide](../extensions/agents/README.md)              |
| `ask-user-question`   | Let an agent ask you a question when it needs a decision.             | [Guide](../extensions/ask-user-question/README.md)   |
| `ast-structural-edit` | Find code by structure, preview edits, and apply or discard them.     | [Guide](../extensions/ast-structural-edit/README.md) |
| `model`               | Assign models to reusable roles and adjust thinking effort.           | [Guide](../extensions/model/README.md)               |
| `status-line`         | See the active model, context use, and working directory at a glance. | [Guide](../extensions/status-line/README.md)         |
| `workflows`           | Save and run multi-agent workflows, inspect results, and resume runs. | [Guide](../extensions/workflows/README.md)           |

<!-- locus:extensions:end -->

Install them together, or choose the resources you need with
[package filters](getting-started.md#load-only-selected-extensions).
Start with [your first workflow](workflows/create.md#your-first-workflow), then
use the guides above for individual commands and options.

Contributor details live in [architecture and repository boundaries](architecture.md).