# State Machine Actor

This actor is the TApp's actor that's loaded into the [mini-runtime](/z_glossary/mini-runtime.md) of the [state machine replicas](https://github.com/tearust/t-rust/blob/master/docs/_gitbook-dev-docs/z_glossary/state_machine_replica.md). It handles the [txn](/z_glossary/txn.md) (also called command) to update the state.

Only the [txn](/z_glossary/txn.md) that's moved to the last execution point of the [conveyor](/z_glossary/conveyor.md) can be picked up and executed in this actor.


---

# 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://dev.teaproject.org/z_glossary/state_machine_actor.md?ask=<question>
```

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.