Jadpo is experimental and not ready for production. These docs follow the compiler's main branch as of 30 Oct 2026. What's built · Install 0.1.0
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Reference: Values and types

Values and types · rule

type.primitive_signature

Signature uses a built-in type directly.

Area 2, Values and types; not declinable; the next step is usually the agent's.

example
type Title = Text {    max_length: 200}function normalise(value: Text) -> Title {    return Title(value)}
text
error: This parameter uses `Text` directly --> main.jadpo:5:27  |5 | function normalise(value: Text) -> Title {  |                           ^^^^ a built-in type  reason: Functions, actions and queries take and return named types, so each value says what it means and carries its rules; `Text` says neither.  next: Declare a named type built on `Text` and use it here (agent)  rule: type.primitive_signature  help: https://jadpo.dev/docs/errors/type.primitive_signaturecheck failed: 1 error, 1 file

Markdown for agents: /docs/errors/type.primitive_signature.md.Built from Jadpo main at a707efb.