sema-docs 1.20.2

Canonical structured documentation for Sema builtins/special forms; powers LSP hover/completion and REPL apropos
Documentation 
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---
name: "message?"
module: "predicates"
section: "LLM Type Predicates"
---

Test if a value is an LLM message.

```sema
(message? (message :user "hi"))   ; => #t
```