Jadpo is experimental and not ready for production. These docs follow the compiler's main branch as of 5 Nov 2026. What's built · Install 0.3.0
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ReferenceAI

LanguageValues and typesStandard typesAI

ChatMessage

On this page

One message in a conversation with an AI model: who wrote it and what it says.

Use it to build the history you send to a model. The ChatRole says who wrote it.

Shape

Field Type Required?
role ChatRole Yes
content Text Yes

Example

example
ChatMessage { role: ChatRole.user content: "Summarise this page." }

Good to know

  • == tells you whether two are the same. < and list.sort_by don't take it, so sort by one of its parts instead.
  • A field that holds one counts as personal data (health), so you don't mark it yourself.

In JSON

An object of its parts, in a request, a response or json.write:

json
{"role":"system","content":"Answer in British English."}{"role":"user","content":"Summarise this page.\nThanks"}{"role":"assistant","content":""}

Details

Text form, storage, how it is shown, and operations

ChatMessage is in the group AI, and has been in Jadpo since 0.1.0.

Text form

It has no single text form, so text.from and text.parse don't take it.

How it is stored

It is stored in 2 columns, each named for the field, _ and its suffix. This is {"role":"user","content":"Summarise this page.\nThanks"}:

Column Type Holds
<field>_role text 'user'
<field>_content text E'Summarise this page.\nThanks'

How it is shown to people

text.format(value, locale:) shows it to people in their locale.

With locale: Locale.en_gb:

Value Shown
{"role":"system","content":"Answer in British English."} system: Answer in British English.
{"role":"user","content":"Summarise this page.\nThanks"} "user: Summarise this page.\nThanks"
{"role":"assistant","content":""} assistant:

Operations

It also takes text.format, json.read, json.write and ==. How every standard type behaves says how they work.

Markdown for agents: /docs/types/type-chat-message.md.Built from Jadpo main at aee2e8f.