Possible to focus on sub-parts of signature_help?

[xpe]

Consider this example:

#set text(
  lang: "en",
  region: "us",
)

= Many Worlds

Placing the cursor over text and pressing space-k works as expected:

(Then I can use my trackpad to scroll the pop-up information.)

However, putting the cursor over lang or region and pressing space-k has no effect. Is this expected? If not, is it likely a problem with the language server?

In my example above, I'm using tinymist, an LSP for Typst.

Somewhat Related

• Option to cycle through signature help signatures #5403
• Key remapping for compositor components #5505
• Show docs for item under cursor - function overloads #5514
• Function description/docs auto pop up in Normal mode #6169
• Better signature-help/autocomplete popup overlap handling #9144
• Add an ability to hide signature help #11748
• The depth of auto-signature-help  #11984
• Add possibility to remap the signature-help popup commands #13964

[waddie]

If you run Helix with -v (e.g. hx -v example.typ), you can see the request/response to tinymist in the log (:log-open). A hover request looks like this:

2026-07-25T23:00:49.530 helix_lsp::transport [INFO] tinymist -> {"jsonrpc":"2.0","method":"textDocument/hover","params":{"position":{"character":5,"line":1},"textDocument":{"uri":"file:///Users/waddie/source/modern-cv/example.typ"}},"id":5}

i.e. Helix just requests for a file position (character/line here are zero-indexed). The response for lang is null:

2026-07-25T23:00:49.531 helix_lsp::transport [INFO] tinymist <- {"jsonrpc":"2.0","id":5,"result":null}

So, tinymist has nothing to say about that file position.

Note <C-u>/<C-d> or PgUp/PgDn will scroll the hover box, you don’t need to reach for the trackpad. :)