# Nodes and Workers

{% @mermaid/diagram content="---
title: ctx.start\_worker("echoer", Echoer, AllowAll, AllowAll)
--------------------------------------------------------------

sequenceDiagram
User->>Context(app): 1. start\_worker
Context(app)->>Context(worker): 2. create worker context
Context(worker)->>WorkerRelay: 3. create worker relay
WorkerRelay->>WorkerRelay: 4. start receiving loop
Context(worker)->>Router: 5. send(StartWorker)
Router->>Router: 6. register(worker address, context sender)
" %}

{% @mermaid/diagram content="
sequenceDiagram
User->>Context(app): 1. send("echoer", "Hello Ockam!")
Context(app)->>Router: 2. send(SenderReq("echoer", reply\_sender))
Router->>Router: 3.resolve\_address
Router-->>Context(app): 4. address + worker channel sender
Context(app)->>Context(app): 5. make relay message
Context(app)->>Context(app): 6. check outgoing relay message
Context(app)->>WorkerRelay: 7. send relay message
WorkerRelay->>Context(worker): 8. receive\_next
Context(worker)->>Context(worker): 9. is\_authorized(relay message)
WorkerRelay->>WorkerRelay: 10. decode message
WorkerRelay->>Worker: 11. handle\_message
Worker->>Context(worker): 12. send(return router, message body)
Context(worker)-->>Context(app): 13. routed back message
User->>Context(app): 14. wait on the message using the app Context receiver
" %}


---

# 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.ockam.io/documentation/libraries/rust/internals/nodes.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.