WC-4172 Document worker naming limitations, including subdomains (#26350)

Author: WillTaylorDev

src/content/docs/workers/configuration/routing/workers-dev.mdx

@@ -73,6 +73,22 @@ If you do not specify `workers_dev = false` but add a [`routes` component](/work
 If you disable your `workers.dev` route in the Cloudflare dashboard but do not update your Worker's Wrangler file with `workers_dev = false`, the `workers.dev` route will be re-enabled the next time you deploy your Worker with Wrangler.
 :::
 
+## Limitations
+
+When deploying a Worker with a `workers.dev` subdomain enabled, your Worker name must meet the following requirements:
+
+- Must be 63 characters or less
+- Must contain only alphanumeric characters (`a-z`, `A-Z`, `0-9`) and dashes (`-`)
+- Cannot start or end with a dash (`-`)
+
+These restrictions apply because the Worker name is used as a DNS label in your `workers.dev` URL. DNS labels have a maximum length of 63 characters and cannot begin or end with a dash.
+
+:::note
+
+Worker names can be up to 255 characters when not using a `workers.dev` subdomain. If you need a longer name, you can disable `workers.dev` and use [routes](/workers/configuration/routing/routes/) or [custom domains](/workers/configuration/routing/custom-domains/) instead.
+
+:::
+
 ## Related resources
 
 - [Announcing `workers.dev`](https://blog.cloudflare.com/announcing-workers-dev)

src/content/docs/workers/wrangler/configuration.mdx

@@ -100,7 +100,7 @@ The `main` key is optional for assets-only Workers.
 :::
 
 - `name` <Type text="string" /> <MetaInfo text="required" />
-  - The name of your Worker. Alphanumeric characters (`a`,`b`,`c`, etc.) and dashes (`-`) only. Do not use underscores (`_`).
+  - The name of your Worker. Alphanumeric characters (`a`,`b`,`c`, etc.) and dashes (`-`) only. Do not use underscores (`_`). Worker names can be up to 255 characters. If you plan to use a [`workers.dev` subdomain](/workers/configuration/routing/workers-dev/), the name must be 63 characters or less and cannot start or end with a dash.
 
 - `main` <Type text="string" /> <MetaInfo text="required" />
   - The path to the entrypoint of your Worker that will be executed. For example: `./src/index.ts`.